From: Matthew Davis <mdavis_at_physics.uq.edu.au>

Date: Sat, 6 Nov 2010 23:25:39 +1000

Date: Sat, 6 Nov 2010 23:25:39 +1000

Dear subscribers,

This week's selection was compiled by the Ghost of Christmas Past, and contains

57 new abstracts and 30 replacements.

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arXiv:0902.3421 (*cross-listing*)

Date: Thu, 19 Feb 2009 17:59:36 GMT (737kb)

Date (revised v2): Thu, 30 Sep 2010 03:43:33 GMT (745kb)

Title: A fully quantal molecular description for the spectra of bosons and

fermions in the lowest Landau level

Authors: Constantine Yannouleas and Uzi Landman

Categories: cond-mat.mes-hall cond-mat.str-el nucl-th physics.atom-ph

Comments: REVTEX 4. 6 pages with 1 color figure and 3 Tables. An extended

version [15 pages] was published as Phys. Rev. A 81, 023609 (2010); see

http://arxiv.org/abs/1001.1090. For other related papers, see

http://www.prism.gatech.edu/~ph274cy/

\\

Through the introduction of a class of appropriate translationally invariant

trial wave functions, we show that the strong correlations in the lowest Landau

level (LLL) reflect in finite systems the emergence of intrinsic point-group

symmetries associated with rotations and vibrations of molecules formed through

particle localization. This quantal molecular description is universal, being

valid for both bosons and fermions, for both the yrast and excited states of

the LLL spectra, and for both low and high angular momenta. "Quantum-fluid"

physical pictures associated with Jastrow-type trial functions are shown to be

reducible to the molecular description introduced in this paper.

\\ ( http://arxiv.org/abs/0902.3421 , 745kb)

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arXiv:1004.3954 (*cross-listing*)

Date: Thu, 22 Apr 2010 16:02:05 GMT (1640kb)

Date (revised v2): Mon, 27 Sep 2010 13:38:30 GMT (1640kb)

Title: Fragmented Many-Body states of definite angular momentum and stability

of attractive 3D Condensates

Authors: Marios C. Tsatsos, Alexej I. Streltsov, Ofir E. Alon and Lorenz S.

Cederbaum

Categories: cond-mat.quant-gas quant-ph

Comments: 45 pages, 10 figures, appeared in Phys. Rev. A with minor changes

Journal-ref: Phys. Rev. A 82, 033613 (2010)

DOI: 10.1103/PhysRevA.82.033613

\\

A three dimensional attractive Bose-Einstein Condensate (BEC) is expected to

collapse, when the number of the particles $N$ in the ground state or the

interaction strength $\lambda_0$ exceeds a critical value. We study systems of

different particle numbers and interaction strength and find that even if the

overall ground state is collapsed there is a plethora of fragmented excited

states that are still in the metastable region. Utilizing the

\emph{configuration interaction} expansion we determine the spectrum of the

ground (`yrast') and excited many-body states with definite total angular

momentum quantum numbers $0\leqslant L\leqslant N$ and $-L\leqslant

M_L\leqslant L$, and we find and examine states that survive the collapse. This

opens up the possibility of realizing a metastable system with overcritical

numbers of bosons in a ground state with angular momentum $L\neq0$. The

multi-orbital mean-field theory predictions about the existence of fragmented

metastable states with overcritical numbers of bosons are verified and

elucidated at the many-body level. The descriptions of the total angular

momentum within the mean-field and the many-body approaches are compared.

\\ ( http://arxiv.org/abs/1004.3954 , 1640kb)

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arXiv:1009.4634 (*cross-listing*)

Date: Thu, 23 Sep 2010 15:20:41 GMT (735kb)

Title: Hawking radiation from ultrashort laser pulse filaments

Authors: F. Belgiorno, S.L. Cacciatori, M. Clerici, V. Gorini, G. Ortenzi, L.

Rizzi, E. Rubino, V.G. Sala, D. Faccio

Categories: gr-qc astro-ph.CO physics.optics quant-ph

Comments: 4 pages, 4 figures, Phys. Rev. Lett. (accepted)

\\

Event horizons of astrophysical black holes and gravitational analogues have

been predicted to excite the quantum vacuum and give rise to the emission of

quanta, known as Hawking radiation. We experimentally create such a

gravitational analogue using ultrashort laser pulse filaments and our

measurements demonstrate a spontaneous emission of photons that confirms

theoretical predictions.

\\ ( http://arxiv.org/abs/1009.4634 , 735kb)

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arXiv:1009.4700

Date: Thu, 23 Sep 2010 20:00:06 GMT (576kb)

Title: Thermodynamics of the Antiferromagnetic Heisenberg Model on the

Checkerboard Lattice

Authors: Ehsan Khatami and Marcos Rigol

Categories: cond-mat.str-el

Comments: 10 pages, 13 figures

\\

Employing numerical linked-cluster expansions (NLCEs) along with exact

diagonalizations of finite clusters with periodic boundary condition, we study

the energy, specific heat, entropy, and various susceptibilities of the

antiferromagnetic Heisenberg model on the checkerboard lattice. NLCEs, combined

with extrapolation techniques, allow us to access temperatures much lower than

those accessible to exact diagonalization and other series expansions. We find

that the high-temperature peak in specific heat decreases as the frustration

increases, consistent with the large amount of unquenched entropy in the region

around maximum classical frustration, where the nearest-neighbor and

next-nearest neighbor exchange interactions (J and J', respectively) have the

same strength, and with the formation of a second peak at lower temperatures.

The staggered susceptibility shows a change of character when J' increases

beyond 0.75J, implying the disappearance of the long-range antiferromagnetic

order at zero temperature. For J'=4J, in the limit of weakly-coupled crossed

chains, we find large susceptibilities for stripe and Neel order with

Q=(pi/2,pi/2) at low temperatures with antiferromagnetic correlations along the

chains. Other magnetic and bond orderings, such as a plaquette valence-bond

solid and a crossed-dimer order suggested by previous studies, have also been

investigated.

\\ ( http://arxiv.org/abs/1009.4700 , 576kb)

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arXiv:1009.4707 (*cross-listing*)

Date: Thu, 23 Sep 2010 20:03:12 GMT (401kb)

Title: Far-ultraviolet signatures of the 3He(n,tp) reaction in noble gas

mixtures

Authors: Patrick P. Hughes, Michael A. Coplan, Alan K. Thompson, Robert E. Vest

and Charles W. Clark

Categories: nucl-ex cond-mat.quant-gas physics.atom-ph

\\

Previous work showed that the 3He(n,tp) reaction in a cell of 3He at

atmospheric pressure generated tens of far-ultraviolet photons per reacted

neutron. Here we report amplification of that signal by factors of 1000 and

more when noble gases are added to the cell. Calibrated filter-detector

measurements show that this large signal is due to noble-gas excimer emissions,

and that the nuclear reaction energy is converted to far-ultraviolet radiation

with efficiencies of up to 30%. The results have been placed on an absolute

scale through calibrations at the NIST SURF III synchrotron. They suggest

possibilities for high-efficiency neutron detectors as an alternative to

existing proportional counters.

\\ ( http://arxiv.org/abs/1009.4707 , 401kb)

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arXiv:1009.4708

Date: Thu, 23 Sep 2010 20:05:55 GMT (313kb)

Title: Spin-charge separation in one-dimensional fermion systems beyond the

Luttinger liquid theory

Authors: Thomas L. Schmidt and Adilet Imambekov and Leonid I. Glazman

Categories: cond-mat.str-el

Comments: 25 pages, 11 figures

\\

We develop a nonperturbative zero-temperature theory for the dynamic response

functions of interacting one-dimensional spin-1/2 fermions. In contrast to the

conventional Luttinger liquid theory, we take into account the nonlinearity of

the fermion dispersion exactly. We calculate the power-law singularities of the

spectral function and the charge and spin density structure factors for

arbitrary momenta and interaction strengths. The exponents characterizing the

singularities are functions of momenta and differ significantly from the

predictions of the linear Luttinger liquid theory. We generalize the notion of

the spin-charge separation to the nonlinear spectrum. This generalization leads

to phenomenological relations between threshold exponents and the threshold

energy.

\\ ( http://arxiv.org/abs/1009.4708 , 313kb)

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arXiv:1009.4712 (*cross-listing*)

Date: Thu, 23 Sep 2010 20:14:40 GMT (434kb)

Title: Crystalline phase for one-dimensional ultra-cold atomic bosons

Authors: Hans Peter B\"uchler

Categories: cond-mat.quant-gas quant-ph

Comments: 4 pages, 2 figures

\\

We study cold atomic gases with a contact interaction and confined into

one-dimension. Crossing the confinement induced resonance the correlation

between the bosons increases, and introduces an effective range for the

interaction potential. Using the mapping onto the sine-Gordon model and a

Hubbard model in the strongly interacting regime allows us to derive the phase

diagram in the presence of an optical lattice. We demonstrate the appearance of

a phase transition from a Luttinger liquid with algebraic correlations into a

crystalline phase with a particle on every second lattice site.

\\ ( http://arxiv.org/abs/1009.4712 , 434kb)

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arXiv:1009.4731

Date: Thu, 23 Sep 2010 21:52:26 GMT (22kb)

Title: Quantum criticality in inter-band superconductors

Authors: Aline Ramires and Mucio A. Continentino

Categories: cond-mat.str-el hep-th

Comments: 5 pages, 1 figure

\\

In fermionic systems with different types of quasi-particles, attractive

interactions can give rise to exotic superconducting states, as pair density

wave (PDW) superconductivity and breached pairing. In the last years the search

for these new types of ground states in cold atom and in metallic systems has

been intense. In the case of metals the different quasi-particles may be the up

and down spin bands in an external magnetic field or bands arising from

distinct atomic orbitals that coexist at a common Fermi surface. These systems

present a complex phase diagram as a function of the difference between the

Fermi wave-vectors of the different bands. This can be controlled by external

means, varying the density in the two-component cold atom system or, in a

metal, by applying an external magnetic field or pressure. Here we study the

zero temperature instability of the normal system as the Fermi wave-vectors

mismatch of the quasi-particles (bands) is reduced and find a second order

quantum phase transition to a PDW superconducting state. From the nature of the

quantum critical fluctuations close to the superconducting quantum critical

point (SQCP), we obtain its dynamic critical exponent. It turns out to be $z=2$

and this allows to fully characterize the SQCP for dimensions $d \ge 2$.

\\ ( http://arxiv.org/abs/1009.4731 , 22kb)

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arXiv:1009.4737

Date: Thu, 23 Sep 2010 23:10:56 GMT (767kb,D)

Title: Interaction dependent temperature effects in Bose-Fermi mixtures in

optical lattices

Authors: M. Cramer

Categories: cond-mat.quant-gas cond-mat.stat-mech

Comments: 6 pages, 3 figures

\\

We present a quantitative finite temperature analysis of a recent experiment

with Bose-Fermi mixtures in optical lattices, in which the dependence of the

coherence of bosons on the inter-species interaction was analyzed. Our theory

reproduces the characteristics of this dependence and suggests that intrinsic

temperature effects play an important role in these systems. Namely, under the

assumption that the ramping up of the optical lattice is an isentropic process,

adiabatic temperature changes of the mixture occur that depend on the

interaction between bosons and fermions. Matching the entropy of two

regimes---no lattice on the one hand and deep lattices on the other---allows us

to compute the temperature in the lattice and the visibility of the

quasi-momentum distribution of the bosonic atoms, which we compare to the

experiment. We briefly comment on the remaining discrepancy between theory and

experiment, speculating that it may in part be attributed to the dependence of

the Bose-Fermi scattering length on the confinement of the atoms.

\\ ( http://arxiv.org/abs/1009.4737 , 767kb)

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arXiv:1009.4822

Date: Fri, 24 Sep 2010 12:30:56 GMT (40kb)

Title: Gradient corrections to the local density approximation for trapped

superfluid Fermi gases

Authors: Andr\'as Csord\'as. Orsolya Alm\'asy and P\'eter Sz\'epfalusy

Categories: cond-mat.quant-gas

Comments: 13 pages, 8 figures

\\

Two species superfluid Fermi gas is investigated on the BCS side up to the

Feshbach resonance. Using the Greens's function technique gradient corrections

are calculated to the generalized Thomas-Fermi theory including Cooper pairing.

Their relative magnitude is found to be measured by the small parameter

$(d/R_{TF})^4$, where $d$ is the oscillator length of the trap potential and

$R_{TF}$ is the radial extension of the density $n$ in the Thomas-Fermi

approximation. In particular at the Feshbach resonance the universal %constant

$A_{TF}$ has the %correction in the center $A=A_{TF}+A_2(d/R_{TF})^4+\...$

corrections to the local density approximation are calculated and a universal

prefactor $\kappa_W=7/27$ is derived for the von Weizs\"acker type correction

$\kappa_W(\hbar^2/2m)(\nabla^2 n^{1/2}/n^{1/2})$.

\\ ( http://arxiv.org/abs/1009.4822 , 40kb)

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arXiv:1009.4844

Date: Fri, 24 Sep 2010 14:07:54 GMT (186kb,D)

Title: Full counting statistics of the interference contrast from independent

Bose-Einstein condensates

Authors: Steffen Patrick Rath and Wilhelm Zwerger

Categories: cond-mat.quant-gas

Comments: 15 pages, 7 figures

\\

We show that the visibility in interference experiments with Bose-Einstein

condensates is directly related to the condensate fraction. The probability

distribution of the contrast over many runs of an interference experiment thus

gives the full counting statistics of the condensed atom number. For

two-dimensional Bose gases, we discuss the universal behavior of the

probability distribution in the superfluid regime and provide analytical

expressions for the distributions for both homogeneous and harmonically trapped

samples. They are non-Gaussian and unimodal with a variance that is directly

related to the superfluid density. In general, the visibility is a

self-averaging observable only in the presence of long range phase coherence.

Close to the transition temperature, the visibility distribution reflects the

universal order parameter distribution in the vicinity of the critical point.

\\ ( http://arxiv.org/abs/1009.4844 , 186kb)

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arXiv:1009.4868 (*cross-listing*)

Date: Fri, 24 Sep 2010 15:32:26 GMT (51kb,D)

Title: Exotic magnetic orders for high spin ultracold fermions

Authors: E. Szirmai and M. Lewenstein

Categories: cond-mat.quant-gas quant-ph

Comments: 6 pages

\\

We study Hubbard models for ultracold bosonic or fermionic atoms loaded into

an optical lattice. The atoms carry a high-spin $F>1/2$, and interact on site

via strong repulsive Van der Waals forces. Making convenient rearrangements of

the interaction terms, and exploiting their symmetry properties, we derive low

energy effective models with nearest-neighbor interactions, and their

properties. We apply our method to $F=3/2$ fermions on two-dimensional square

lattice at quarter filling, and investigate mean-field equations for repulsive

singlet $g_0$ and quintet $g_2$ couplings. We find that the plaquette state

appearing in the highly symmetric $SU(4)$ case ($g_0=g_2$) does not require

fine tuning, and is stable in an extended region of the phase diagram. This

phase competes with an $SU(2)$ flux state, that is always suppressed for

repulsive interactions in absence of external magnetic field. The $SU(2)$ flux

state has, however, lower energy than the plaquette phase, and stabilizes in

the presence of a weak applied magnetic field. Some preliminary results for

$F=5/2$ fermions are also presented.

\\ ( http://arxiv.org/abs/1009.4868 , 51kb)

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arXiv:1009.4960

Date: Sat, 25 Sep 2010 00:44:29 GMT (13kb)

Title: Current trends in searches for new physics using measurements of parity

violation and electric dipole moments in atoms and molecules

Authors: V. A. Dzuba and V. V. Flambaum

Categories: physics.atom-ph hep-ph nucl-th

Comments: 6 pages; the article is based on invited talk at the Workshop on

Fundamental Physics using atoms (FPUA2010), 7-9 August, 2010, Osaka, Japan

\\

We review current status of the study of parity and time invariance phenomena

in atoms, nuclei and molecules. We focus on three most promising areas of

research: (i) parity non-conservation in a chain of isotopes, (ii) search for

nuclear anapole moments, and (iii) search for permanent electric dipole moments

(EDM) of atoms and molecules which are caused by either, electron EDM or

nuclear $T,P$-odd moments such as nuclear EDM and nuclear Schiff moment.

\\ ( http://arxiv.org/abs/1009.4960 , 13kb)

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arXiv:1009.4968

Date: Sat, 25 Sep 2010 03:25:45 GMT (7052kb,D)

Title: Reflection of a Particle from a Quantum Measurement

Authors: Jonathan B. Mackrory, Kurt Jacobs, Daniel A. Steck

Categories: quant-ph

Comments: 28 pages, 7 figures, uses IOP style files

\\

We present a generalization of continuous position measurements that accounts

for a spatially inhomogeneous measurement strength. This describes many real

measurement scenarios, in which the rate at which information is extracted

about position has itself a spatial profile, and includes measurements that

detect if a particle has crossed from one region into another. We show that

such measurements can be described, in their averaged behavior, as

stochastically fluctuating potentials of vanishing time average. Reasonable

constraints restrict the form of the measurement to have degenerate outcomes,

which tend to drive the system to spatial superposition states. We present the

results of quantum-trajectory simulations for measurements with a step-function

profile (a "which-way" measurement) and a Gaussian profile. We find that the

particle can coherently reflect from the measurement region in both cases,

despite the stochastic nature of the measurement back-action. In addition, we

explore the connection to the quantum Zeno effect, where we find that the

reflection probability tends to unity as the measurement strength increases.

Finally, we discuss two physical realizations of a spatially varying position

measurement using atoms.

\\ ( http://arxiv.org/abs/1009.4968 , 7052kb)

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arXiv:1009.5007

Date: Sat, 25 Sep 2010 12:12:33 GMT (508kb,D)

Title: Reponse to Comment on "Direct mapping of the finite temperature phase

diagram of strongly correlated quantum models"

Authors: Qi Zhou, Yasuyuki Kato, Naoki Kawashima, and Nandini Trivedi

Categories: cond-mat.quant-gas

Comments: 1 page, 1 figure

\\

Pollet et al have questioned our claim staked in Phys. Rev. Lett. 103, 085701

(2009) that from the location of sharp features in the compressibility in the

trap, it is possible to map out the phase boundary between two phases within

reasonable accuracy. We stand by it and use this reply to sharpen the

conditions under which "sharp" features in compressibility reflect the effects

of critical fluctuations.

\\ ( http://arxiv.org/abs/1009.5007 , 508kb)

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arXiv:1009.5020

Date: Sat, 25 Sep 2010 15:44:25 GMT (275kb)

Title: Ultimate quantum bounds on mass measurements with a nano-mechanical

oscillator

Authors: Daniel Braun

Categories: quant-ph cond-mat.mes-hall

Comments: 13 pages latex

\\

Nano-mechanical resonators have a large potential as sensors of very small

adsorbed masses, down to the atomic level and beyond. Here I establish the

fundamental lower bound on the mass that can be measured with a nano-mechanical

oscillator in a given quantum state based on the quantum Cram\'er--Rao bound,

limited only by the laws of quantum mechanics, and identify the quantum states

which will allow the largest sensitivity for a given maximum energy.

\\ ( http://arxiv.org/abs/1009.5020 , 275kb)

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arXiv:1009.5044

Date: Sun, 26 Sep 2010 01:26:17 GMT (51kb)

Title: Effective super Tonks-Girardeau gases as ground states of strongly

attractive multi-component fermions

Authors: Xiangguo Yin, Xi-Wen Guan, M T Batchelor, Shu Chen

Categories: cond-mat.quant-gas

Comments: 5 pages, 3 figures

\\

In the strong interaction limit, attractive fermions with $N$-component

hyperfine states in a one-dimensional waveguide form unbreakable bound cluster

states. We demonstrate that the ground state of strongly attractive SU($N$)

Fermi gases can be effectively described by a super Tonks-Girardeau gas-like

state composed of bosonic cluster states with strongly attractive

cluster-cluster interaction for even $N$, and a Fermi duality of a super

Tonks-Girardeau gas-like state composed of fermionic cluster states with weakly

interacting cluster-cluster p-wave interaction for odd $N$.

\\ ( http://arxiv.org/abs/1009.5044 , 51kb)

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arXiv:1009.5047

Date: Sun, 26 Sep 2010 02:05:10 GMT (745kb)

Title: Hybrid optical pumping of optically dense alkali-metal vapor without

quenching gas

Authors: M. V. Romalis

Categories: physics.atom-ph

Comments: 4 pages

\\

Optical pumping of an optically thick atomic vapor typically requires a

quenching buffer gas, such as N$_{2}$, to prevent radiation trapping of

unpolarized photons which would depolarize the atoms. We show that optical

pumping of a trace contamination of Rb present in K metal results in a 4.5

times higher polarization of K than direct optical pumping of K in the absence

of N$_{2}$. Such spin-exchange polarization transfer from optically-thin

species is useful in a variety of areas, including spin-polarized nuclear

scattering targets and electron beams, quantum-non-demolition spin

measurements, and ultra-sensitive magnetometry.

\\ ( http://arxiv.org/abs/1009.5047 , 745kb)

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arXiv:1009.5120

Date: Sun, 26 Sep 2010 19:41:19 GMT (45kb)

Title: Parametric excitation of a 1D gas in integrable and non-integrable cases

Authors: M. Colom\'e-Tatch\'e and D.S. Petrov

Categories: cond-mat.quant-gas

Comments: 4 pages, 2 figures

\\

We study the response of a highly excited 1D gas with point-like interactions

to a periodic modulation of the coupling constant. We calculate the

corresponding dynamic structure factors and show that their low-frequency

behavior differs dramatically for integrable and non-integrable models.

Non-integrable systems are sensitive to excitations with frequencies as low as

the mean level spacing, whereas much higher frequencies are required to excite

an integrable system. This effect can be used as a probe of integrability for

mesoscopic 1D systems and can be observed experimentally by measuring the

heating rate of a parametrically excited gas.

\\ ( http://arxiv.org/abs/1009.5120 , 45kb)

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arXiv:1009.5124

Date: Sun, 26 Sep 2010 20:24:49 GMT (769kb,D)

Title: Diffusion, thermalization and optical pumping of YbF molecules in a cold

buffer gas cell

Authors: S. M. Skoff, R. J. Hendricks, C. D. J. Sinclair, J. J. Hudson, D. M.

Segal, B. E. Sauer, E. A. Hinds, M. R. Tarbutt

Categories: physics.atom-ph

Comments: 20 pages, 11 figures

\\

We produce YbF molecules with a density of 10^18 m^-3 using laser ablation

inside a cryogenically-cooled cell filled with a helium buffer gas. Using

absorption imaging and absorption spectroscopy we study the formation,

diffusion, thermalization and optical pumping of the molecules. The absorption

images show an initial rapid expansion of molecules away from the ablation

target followed by a much slower diffusion to the cell walls. We study how the

time constant for diffusion depends on the helium density and temperature, and

obtain values for the YbF-He diffusion cross-section at two different

temperatures. We measure the translational and rotational temperatures of the

molecules as a function of time since formation, obtain the characteristic time

constant for the molecules to thermalize with the cell walls, and elucidate the

process responsible for limiting this thermalization rate. Finally, we make a

detailed study of how the absorption of the probe laser saturates as its

intensity increases, showing that the saturation intensity is proportional to

the helium density. We use this to estimate collision rates and the density of

molecules in the cell.

\\ ( http://arxiv.org/abs/1009.5124 , 769kb)

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arXiv:1009.5155

Date: Mon, 27 Sep 2010 04:23:30 GMT (440kb)

Title: Quantum Criticality from in-situ Density Imaging

Authors: Shiang Fang, Chia-Ming Chung, Ping Nang Ma, Pochung Chen, Daw-Wei Wang

Categories: cond-mat.quant-gas cond-mat.stat-mech

Comments: 4 pages

\\

We perform large-scale Quantum Monte Carlo (QMC) simulations for strongly

interacting bosons in a 2D optical lattice trap, and confirm an excellent

agreement with the benchmarking in-situ density measurements by the Chicago

group [1]. We further present a general finite temperature phase diagram both

for the uniform and the trapped systems, and demonstrate how the universal

scaling properties near the superfluid(SF)-to-Mott insulator(MI) transition can

be observed by analysing the in-situ density profile. The characteristic

temperature to find such quantum criticality is estimated to be of the order of

the single-particle bandwidth, which should be achievable in the present or

near future experiments. Finally, we examine the validity regime of the local

fluctuation-dissipation theorem (FDT), which can be a used as a thermometry in

the strongly interacting regime.

\\ ( http://arxiv.org/abs/1009.5155 , 440kb)

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arXiv:1009.5160

Date: Mon, 27 Sep 2010 05:07:25 GMT (183kb)

Title: Ion-atom cold collision: Formation of cold molecular ion by radiative

processes

Authors: Arpita Rakshit, Bimalendu Deb

Categories: physics.atom-ph

Comments: 8 pages, 8 figures

\\

We discuss theoretically ion-atom collisions at low energy and predict the

possibility of formation of cold molecular ion by photoassociation and

stimulated radiative charge transfer. We present results on radiative homo- and

hetero-nuclear atom-ion cold collisions that reveal threshold behaviour of

atom-ion systems. We also discuss formation of ground state cold molecular ion

by two-photon Raman photoassociation.

\\ ( http://arxiv.org/abs/1009.5160 , 183kb)

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arXiv:1009.5241

Date: Mon, 27 Sep 2010 12:45:38 GMT (264kb,D)

Title: Counting Statistics of Many-Particle Quantum Walks

Authors: Klaus Mayer, Malte C. Tichy, Florian Mintert, Thomas Konrad and

Andreas Buchleitner

Categories: quant-ph

Comments: 4 pages, 4 figures

\\

We study quantum walks of many non-interacting particles on a beam splitter

array. Single as well as multi-mode counting statistics are obtained for

generic input states. Bosonic interference effects are identified not only as

local bunching, but also in the correlations of spatially distant modes.

\\ ( http://arxiv.org/abs/1009.5241 , 264kb)

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arXiv:1009.5270

Date: Mon, 27 Sep 2010 14:31:58 GMT (5kb)

Title: Reply to "Comment on 'Topological stability of the half-vortices in

spinor exciton-polariton condensates'"

Authors: Hugo Flayac, Ivan Shelykh, Dmitry Solnyshkov and Guillaume Malpuech

Categories: cond-mat.mes-hall

Comments: 3 Pages, no figure

Journal-ref: H. Flayac, I.A. Shelykh, D.D. Solnyshkov, and G. Malpuech, Phys.

Rev. B 82, 127302 (2010)

DOI: 10.1103/PhysRevB.82.127302

\\

In a recent work [H. Flayac, I.A. Shelykh, D.D. Solnyshkov and G. Malpuech,

Phys. Rev. B 81, 045318 (2010)], we have analyzed the effect of the TE-TM

splitting on the stability of the exciton-polariton vortex states. We

considered classical vortex solutions having cylindrical symmetry and we found

that the so-called half-vortex states [Yu. G. Rubo, Phys. Rev. Lett. 99, 106401

(2007)] are not solutions of the stationary Gross-Pitaevskii equation. In their

Comment [M. Toledo Solano, Yu.G. Rubo, Phys. Rev. B 82, 127301 (2010)], M.

Toledo Solano and Yuri G. Rubo claim that this conclusion is misleading and

pretend to demonstrate the existence of static half-vortices in an

exciton-polariton condensate in the presence of TE-TM splitting. In this reply

we explain why this assertion is not demonstrated satisfactorily.

\\ ( http://arxiv.org/abs/1009.5270 , 5kb)

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arXiv:1009.5438 (*cross-listing*)

Date: Tue, 28 Sep 2010 04:15:37 GMT (705kb)

Title: Exact Yrast Spectra of Cold Atoms on a Ring

Authors: Eriko Kaminishi, Rina Kanamoto, Jun Sato, Tetsuo Deguchi

Categories: cond-mat.quant-gas math-ph math.MP quant-ph

Comments: 5 pages, 3 figures

\\

We propose a methodology to construct excited states with a fixed angular

momentum, namely, "yrast excited states" of finite-size one-dimensional bosonic

systems with periodic boundary conditions. The excitation energies such as the

first yrast excited energy are calculated through the system-size asymptotic

expansion and expressed analytically by dressed energy.

Interestingly, they are grouped into sets of almost degenerate energy levels.

The low-lying excitation spectrum near the yrast state is consistent with the $

U(1)$ conformal field theories if the total angular momentum is given by an

integral multiple of particle number; i.e., if the system is supercurrent.

\\ ( http://arxiv.org/abs/1009.5438 , 705kb)

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arXiv:1009.5448

Date: Tue, 28 Sep 2010 05:35:14 GMT (42kb,D)

Title: Bogoliubov Theory of Disordered Bose-Einstein Condensates

Authors: Christopher Gaul and Cord A. M\"uller

Categories: cond-mat.dis-nn cond-mat.quant-gas

Comments: 4 pages

\\

A theory is presented that describes the excitations of interacting

Bose-Einstein condensates in random potentials with arbitrary spatial

correlation. By a saddle-point expansion around the deformed mean-field

solution, an effective inhomogeneous Bogoliubov Hamiltonian is derived,

achieving an analytical formulation in the case of weak disorder. From this,

disorder corrections to the sound velocity and the zero-temperature condensate

depletion are calculated in all dimensions.

\\ ( http://arxiv.org/abs/1009.5448 , 42kb)

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\\

arXiv:1009.5465

Date: Tue, 28 Sep 2010 06:50:41 GMT (22kb)

Title: Dynamical instability and loss of p-band bosons in optical lattices

Authors: J.-P. Martikainen

Categories: cond-mat.quant-gas

Comments: 6 pages, 6 figures

Report-no: NORDITA-2010-78

\\

We study how the bosonic atoms on the excited p-band of an optical lattice

are coupled to the lowest s-band and the 2nd excited d-band. We find that in

some parameter regimes the atom-atom interactions can cause a dynamical

instability of the p-band atoms towards decay to the s- and d-bands.

Furthermore, even when dynamical instability is not expected s- and d-bands can

become substantially populated.

\\ ( http://arxiv.org/abs/1009.5465 , 22kb)

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\\

arXiv:1009.5505

Date: Tue, 28 Sep 2010 09:48:03 GMT (677kb)

Title: The prospects of sympathetic cooling of NH molecules with Li atoms

Authors: Alisdair O. G. Wallis, Edward J. J. Longdon, Piotr S. \.Zuchowski and

Jeremy M. Hutson

Categories: physics.atom-ph physics.atm-clus physics.chem-ph

\\

We calculate the quartet potential energy surface for Li+NH and use it to

calculate elastic and spin-relaxation cross sections for collisions in

magnetically trappable spin-stretched states. The potential is strongly

anisotropic but spin-relaxation collisions are still suppressed by centrifugal

barriers when both species are in spin-stretched states. In the ultracold

regime, both the elastic and inelastic cross sections fluctuate dramatically as

the potential is varied because of Feshbach resonances. The

potential-dependence is considerably reduced at higher energies. The major

effect of using an unconverged basis set in the scattering calculations is to

shift the resonances without changing their general behaviour. We have

calculated the ratio of elastic and spin-relaxation cross sections, as a

function of collision energy and magnetic field, for a variety of potential

energy surfaces. Most of the surfaces produce ratios that are favorable for

sympathetic cooling, at temperatures below about 20 mK.

\\ ( http://arxiv.org/abs/1009.5505 , 677kb)

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\\

arXiv:1009.5517

Date: Tue, 28 Sep 2010 10:18:22 GMT (175kb)

Title: Tensor Renormalization Group: Local Magnetizations, Correlation

Functions, and Phase Diagrams of Systems with Quenched Randomness

Authors: Can G\"uven, Michael Hinczewski, and A. Nihat Berker

Categories: cond-mat.stat-mech cond-mat.dis-nn

Comments: 8 pages, 7 figures, 1 table

\\

The tensor renormalization-group method, developed by Levin and Nave, brings

systematic improvability to the position-space renormalization-group method and

yields essentially exact results for phase diagrams and entire thermodynamic

functions. The method, previously used on systems with no quenched randomness,

is extended in this study to systems with quenched randomness. Local

magnetizations and correlation functions as a function of spin separation are

calculated as tensor products subject to renormalization-group transformation.

Phase diagrams are extracted from the long-distance behavior of the correlation

functions. The approach is illustrated with the quenched bond-diluted Ising

model on the triangular lattice. An accurate phase diagram is obtained in

temperature and bond-dilution probability, for the entire temperature range

down to the percolation threshold at zero temperature.

\\ ( http://arxiv.org/abs/1009.5517 , 175kb)

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\\

arXiv:1009.5534

Date: Tue, 28 Sep 2010 11:24:32 GMT (9kb)

Title: General, combinatorial formula for the density of states: insights into

the energy equipartition principle and the theory of phase transitions

Authors: Agata Fronczak

Categories: cond-mat.stat-mech

\\

A completely new approach to the problem of energy distribution in

statistical mechanics is developed that results in a general, combinatorial

formula for the density of states. Relying on the approach the energy

equipartition principle is reexamined and a new perspective on the theory of

phase transitions (as resulting from nontrivial patterns of energy distribution

characterized by the well-defined classes of forbidden microstates) is given.

\\ ( http://arxiv.org/abs/1009.5534 , 9kb)

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\\

arXiv:1009.5565

Date: Tue, 28 Sep 2010 13:36:30 GMT (325kb)

Title: Manipulation of a Bose-Einstein condensate by a time-averaged orbiting

potential using phase jumps of the rotating field

Authors: P.W. Cleary, T.W. Hijmans, and J.T.M. Walraven

Categories: cond-mat.quant-gas

Comments: 11 pages, 9 figures

\\

We report on the manipulation of the center-of-mass motion (`sloshing') of a

Bose Einstein condensate in a time-averaged orbiting potential (TOP) trap. We

start with a condensate at rest in the center of a static trapping potential.

When suddenly replacing the static trap with a TOP trap centered about the same

position, the condensate starts to slosh with an amplitude much larger than the

TOP micromotion. We show, both theoretically and experimentally, that the

direction of sloshing is related to the initial phase of the rotating magnetic

field of the TOP. We show further that the sloshing can be quenched by applying

a carefully timed and sized jump in the phase of the rotating field.

\\ ( http://arxiv.org/abs/1009.5565 , 325kb)

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\\

arXiv:1009.5575

Date: Tue, 28 Sep 2010 14:07:22 GMT (3843kb)

Title: Optomechanical transduction of an integrated silicon cantilever probe

using a microdisk resonator

Authors: Kartik Srinivasan, Houxun Miao, Matthew T. Rakher, Marcelo Davanco,

and Vladimir Aksyuk

Categories: physics.optics physics.ins-det

\\

Sensitive transduction of the motion of a microscale cantilever is central to

many applications in mass, force, magnetic resonance, and displacement sensing.

Reducing cantilever size to nanoscale dimensions can improve the bandwidth and

sensitivity of techniques like atomic force microscopy, but current optical

transduction methods suffer when the cantilever is small compared to the

achievable spot size. Here, we demonstrate sensitive optical transduction in a

monolithic cavity-optomechanical system in which a sub-picogram silicon

cantilever with a sharp probe tip is separated from a microdisk optical

resonator by a nanoscale gap. High quality factor (Q ~ 10^5) microdisk optical

modes transduce the cantilever's MHz frequency thermally-driven vibrations with

a displacement sensitivity of ~ 4.4x10^-16 m\sqrt[2]{Hz} and bandwidth > 1 GHz,

and a dynamic range > 10^6 is estimated for a 1 s measurement.

Optically-induced stiffening due to the strong optomechanical interaction is

observed, and engineering of probe dynamics through cantilever design and

electrostatic actuation is illustrated.

\\ ( http://arxiv.org/abs/1009.5575 , 3843kb)

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\\

arXiv:1009.5582

Date: Tue, 28 Sep 2010 14:28:42 GMT (2168kb)

Title: Transient energy excitation in shortcuts to adiabaticity for the time

dependent harmonic oscillator

Authors: Xi Chen, J. G. Muga

Categories: quant-ph

Comments: 7 pages, 6 figures

\\

There is recently a surge of interest to cut down the time it takes to change

the state of a quantum system adiabatically. We study for the time-dependent

harmonic oscillator the transient energy excitation in speed-up processes

designed to reproduce the initial populations at some predetermined final

frequency and time, providing lower bounds and examples. Implications for the

limits imposed to the process times and for the principle of unattainability of

the absolute zero, in a single expansion or in quantum refrigerator cycles, are

drawn.

\\ ( http://arxiv.org/abs/1009.5582 , 2168kb)

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\\

arXiv:1009.5587

Date: Tue, 28 Sep 2010 14:36:04 GMT (225kb)

Title: Boundary effects on the local density of states of one-dimensional Mott

insulators and charge density wave states

Authors: Dirk Schuricht, Fabian H. L. Essler, Akbar Jaefari, and Eduardo

Fradkin

Categories: cond-mat.str-el

Comments: 28 pages

\\

We determine the local density of states (LDOS) for spin-gapped

one-dimensional charge density wave (CDW) states and Mott insulators in the

presence of a hard-wall boundary. We calculate the boundary contribution to the

single-particle Green function in the low-energy limit using field theory

techniques and analyze it in terms of its Fourier transform in both time and

space. The boundary LDOS in the CDW case exhibits a singularity at momentum

2kF, which is indicative of the pinning of the CDW order at the impurity. We

further observe several dispersing features at frequencies above the spin gap,

which provide a characteristic signature of spin-charge separation. This

demonstrates that the boundary LDOS can be used to infer properties of the

underlying bulk system. In presence of a boundary magnetic field mid-gap states

localized at the boundary emerge. We investigate the signature of such bound

states in the LDOS. We discuss implications of our results on STM experiments

on quasi-1D systems such as two-leg ladder materials like Sr14Cu24O41. By

exchanging the roles of charge and spin sectors, all our results directly carry

over to the case of one-dimensional Mott insulators.

\\ ( http://arxiv.org/abs/1009.5587 , 225kb)

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\\

arXiv:1009.5630 (*cross-listing*)

Date: Tue, 28 Sep 2010 16:39:31 GMT (336kb)

Title: Antiferromagnetism in a bosonic mixture of rubidium ($^{87}$Rb) and

potassium ($^{41}$K)

Authors: Uttam Shrestha

Categories: cond-mat.quant-gas quant-ph

Comments: 4 pages, 4 figures, accepted for PRA rapid communication

\\

We simulate the experimental possibility of observing the antiferromagnetic

(AF) order in the bosonic mixtures of rubidium ($^{87}$Rb) and potassium

($^{41}$K) in a two-dimensional optical lattice in the presence of harmonic

confinement. By tuning the interspecies interactions and the lattice heights we

have found the ground states, within the mean-field approximation, that

interpolate from the phase separation to the AF order. For a moderate lattice

height the coexistence of the Mott and AF phase is possible for the Rb atoms

while the K atoms remain in the AF-superfluid phase. This observation may

provide an experimental feasibility to hitherto unobserved AF order for

$^{87}$Rb - $^{41}$K mixture.

\\ ( http://arxiv.org/abs/1009.5630 , 336kb)

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\\

arXiv:1009.5645

Date: Tue, 28 Sep 2010 17:47:28 GMT (2162kb,D)

Title: Collective photon emission from symmetric states created with Rydberg

atoms on a ring lattice

Authors: B. Olmos and I. Lesanovsky

Categories: quant-ph

Comments: 9 pages, 8 figures

\\

We discuss the creation of non-classical light from collective atomic states

that are prepared in a ring-shaped lattice. These states are realized by

exploiting the strong interaction between atoms in high lying energy levels -

so-called Rydberg states - and yield a resource for creating excitations of the

electromagnetic field that carry few photons. We characterize the properties of

these photonic states showing that they are determined by the interplay between

the ring geometry, the structure of the atomic resource states and the

collectivity in the photon emission which is controlled by the lattice spacing.

The system permits the creation of single photons with well-defined orbital

angular momentum and two-photon states that are entangled in orbital angular

momentum.

\\ ( http://arxiv.org/abs/1009.5645 , 2162kb)

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\\

arXiv:1009.5676

Date: Tue, 28 Sep 2010 20:01:35 GMT (386kb)

Title: Exotic superfluid states of lattice fermions in elongated traps

Authors: D.-H. Kim, J. J. Kinnunen, J.-P. Martikainen, P. T\"orm\"a

Categories: cond-mat.quant-gas

\\

The nature of pairing of fermions with spin polarization is a fundamental

problem in many areas of physics, including superconductors in a strong

magnetic field, neutron-proton pairing in nuclear matter, and color

superconductivity in high density QCD. Non-BCS pairing mechanisms have been

proposed for spin-polarized fermions. The Fulde-Ferrell-Larkin-Ovchinnikov

(FFLO) states exhibit pairing with finite momentum. The polarized superfluid

states, so-called Sarma or breached-pair states, are another candidate. In

ultracold Fermi gases, recent experiments characterized the critical

polarization of the transition to the normal state and the phase separation of

the trapped gases into superfluid and normal parts. Here we present real-space

dynamical mean-field theory calculations for attractively interacting fermions

in lattices with elongated traps. The critical polarization is found to be 0.8,

regardless of the trap elongation. Below the critical polarization, we find

unconventional superfluid structures where the polarized superfluid and

Fulde-Ferrell-Larkin-Ovchinnikov-type states emerge across the entire core

region.

\\ ( http://arxiv.org/abs/1009.5676 , 386kb)

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\\

arXiv:1009.5703

Date: Tue, 28 Sep 2010 21:39:33 GMT (331kb)

Title: Few-body resonances of unequal-mass systems with infinite interspecies

two-body s-wave scattering length

Authors: D. Blume and K. M. Daily

Categories: cond-mat.quant-gas

Comments: 17 pages, 17 figures

\\

Two-component Fermi and Bose gases with infinitely large interspecies s-wave

scattering length $a_s$ exhibit a variety of intriguing properties. Among these

are the scale invariance of two-component Fermi gases with equal masses, and

the favorable scaling of Efimov features for two-component Bose gases and

Bose-Fermi mixtures with unequal masses. This paper builds on our earlier work

[D. Blume and K. M. Daily, arXiv:1006.5002] and presents a detailed discussion

of our studies of small unequal-mass two-component systems with infinite $a_s$

in the regime where three-body Efimov physics is absent. We report on

non-universal few-body resonances. Just like with two-body systems on

resonance, few-body systems have a zero-energy bound state in free space and a

diverging generalized scattering length. Our calculations are performed within

a non-perturbative microscopic framework and investigate the energetics and

structural properties of small unequal-mass two-component systems as functions

of the mass ratio $\kappa$, and the numbers $N_{1}$ and $N_2$ of heavy and

light atoms. For purely attractive Gaussian two-body interactions, we find that

the $(N_1,N_2)=(2,1)$ and $(3,1)$ systems exhibit three-body and four-body

resonances at mass ratios $\kappa = 12.314(2)$ and 10.4(2), respectively. The

three- and four-particle systems on resonance are found to be large. This

suggests that the corresponding wave function has relatively small overlap with

deeply-bound dimers, trimers or larger clusters and that the three- and

four-body systems on resonance have a comparatively long lifetime. Thus, it

seems feasible that the features discussed in this paper can be probed

experimentally with present-day technology.

\\ ( http://arxiv.org/abs/1009.5703 , 331kb)

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\\

arXiv:1009.5728

Date: Wed, 29 Sep 2010 01:14:13 GMT (567kb)

Title: Local versus global equilibration near the bosonic Mott-superfluid

transition

Authors: Stefan S. Natu, Kaden R. A. Hazzard and Erich J. Mueller

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figs. 6 subfigures

\\

We study the response of trapped two dimensional cold bosons to time

dependent lattices. We find that in lattice ramps from 11 (superfluid,

$\hbar/U_{\text{i}} = 3$ms, $\hbar/J_{\text{i}} = 45$ms) to 16 recoils (Mott,

$\hbar/U_{\text{f}} = 2$ms, $\hbar/J_{\text{f}} = 130$ms) the local number

fluctuations remains at their equilibrium values if ramps are slower than 3 ms.

Global transport, however, is much slower (1s), especially in the presence of

Mott shells. This separation of timescales has practical implications for cold

atom experiments and cooling protocols.

\\ ( http://arxiv.org/abs/1009.5728 , 567kb)

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\\

arXiv:1009.5784 (*cross-listing*)

Date: Wed, 29 Sep 2010 06:54:57 GMT (1635kb)

Title: Use of Equivalent Hermitian Hamiltonian for $PT$-Symmetric Sinusoidal

Optical Lattices

Authors: H. F. Jones

Categories: physics.optics quant-ph

Comments: 11 pages, 8 figures

\\

We show how the band structure and beam dynamics of non-Hermitian

$PT$-symmetric sinusoidal optical lattices can be approached from the point of

view of the equivalent Hermitian problem, obtained by an analytic continuation

in the transverse spatial variable $x$. In this latter problem the eigenvalue

equation reduces to the Mathieu equation, whose eigenfunctions and properties

have been well studied. That being the case, the beam propagation, which

parallels the time-development of the wave-function in quantum mechanics, can

be calculated using the equivalent of the method of stationary states. We also

discuss a model potential that interpolates between a sinusoidal and periodic

square well potential, showing that some of the striking properties of the

sinusoidal potential, in particular birefringence, become much less prominent

as one goes away from the sinusoidal case.

\\ ( http://arxiv.org/abs/1009.5784 , 1635kb)

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\\

arXiv:1009.5840

Date: Wed, 29 Sep 2010 11:08:20 GMT (1043kb)

Title: Phase slip phenomena in superconductors: from ordered to chaotic

dynamics

Authors: Mathieu Lu-Dac and V. V. Kabanov

Categories: cond-mat.supr-con

Comments: 4 pages, 3 figures (main text) and 1 page, 1 figure (supplementary

material)

\\

We consider flux penetration to a 2D superconducting cylinder. We show that

in the low field limit the kinetics is deterministic. In the strong field limit

the dynamics becomes stochastic. Surprisingly the inhomogeneity in the cylinder

reduces the level of stochasticity because of the predominance of

Kelvin-Helmholtz vortices.

\\ ( http://arxiv.org/abs/1009.5840 , 1043kb)

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\\

arXiv:1009.5868

Date: Wed, 29 Sep 2010 12:42:35 GMT (1064kb)

Title: Shortcut to adiabaticity for a Bose-Einstein condensate

Authors: Jean-Fran\c{c}ois Schaff, Xiao-Li Song, Pablo Capuzzi, Patrizia

Vignolo, Guillaume Labeyrie

Categories: cond-mat.quant-gas

Comments: 5 pages, 4 figures

\\

We present an investigation of the faster-than-adiabatic decompression of a

three-dimensional (3D) Bose-Einstein condensate (BEC) at finite temperature

using an optimal trajectory for the harmonic trapping potential. Using the

scaling invariance properties of the time-dependent Gross-Pitaevskii equation,

we exhibit a solution yielding a final state identical to that obtained through

a perfectly adiabatic transformation, in a much shorter time. Experimentally,

we perform a large trap decompression and displacement within a time comparable

to the final radial trapping period. By simultaneously monitoring the BEC and

the non-condensed fraction, we show that our specific trap trajectory is valid

for both a quantum interacting many-body system and a classical ensemble of

non-interacting particles.

\\ ( http://arxiv.org/abs/1009.5868 , 1064kb)

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\\

arXiv:1009.5892

Date: Wed, 29 Sep 2010 14:23:58 GMT (54kb)

Title: Kicked-rotor quantum resonances in position space: Application to

systems of experimental interest

Authors: Maxence Lepers, V\'eronique Zehnl\'e and Jean-Claude Garreau

Categories: quant-ph cond-mat.quant-gas physics.atom-ph

Comments: 20 pages, 6 figures

\\

In a previous article [Phys. Rev. A, vol. 77, 042638 (2008)], we have

presented an original approach of the quantum resonances of the kicked rotor.

We have described the quantum resonances in position space, for strongly

localized wave packets in comparison to one step of the kicking potential. In

the present article, we extend that approach to experimentally accessible

systems, characterized, on the contrary, by delocalized wave functions in

position space. We demonstrate that the intuitive picture developed previously

is still applicable here. As examples, we consider the dynamics of a thermal

gas and of a Bose-Einstein condensate, both for simple and high-order quantum

resonances. Our numerical simulations enable us to predict new interesting

phenomena, that are explained in a large extent by analytical calculations.

\\ ( http://arxiv.org/abs/1009.5892 , 54kb)

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\\

arXiv:1009.5907

Date: Wed, 29 Sep 2010 15:07:57 GMT (844kb)

Title: Formation and Migration of Vortices in Polariton Condensates

Authors: K. G. Lagoudakis, F. Manni, B. Pietka, M. Wouters, T. C. H. Liew, V.

Savona, A. V. Kavokin, R. Andr\'e and B. Deveaud-Pl\'edran

Categories: cond-mat.quant-gas

\\

We study experimentally and theoretically the temporal evolution of

spontaneously generated vortices during the first instants of the creation of

an exciton-polariton condensate under pulsed non-resonant excitation. By means

of time resolved near-field interferometry we track the path of the vortices,

created at random locations on the sample, to their final pinning positions

imposed by the stationary disorder. Statistically, part of the vortices follow

the same migration paths in many different experiments, while others move

randomly and disappear from ensemble averaged interferograms.

\\ ( http://arxiv.org/abs/1009.5907 , 844kb)

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\\

arXiv:1009.5931

Date: Wed, 29 Sep 2010 16:25:05 GMT (111kb)

Title: Homogeneous and inhomogeneous magnetic phases of constrained dipolar

bosons

Authors: M. Dalmonte, M. Di Dio, L. Barbiero, F. Ortolani

Categories: cond-mat.quant-gas cond-mat.str-el

Comments: 5 pages, 4 figures, 1 table

\\

We study the emergence of several magnetic phases in dipolar bosonic gases

subject to three-body loss mechanism employing numerical simulations based on

the density matrix renormalization group(DMRG) algorithm. After mapping the

original Hamiltonian in spin language, we find a strong parallelism between the

bosonic theory and the spin-1 Heisenberg model with single ion anisotropy and

long-range interactions. A rich phase diagram, including ferromagnetic,

antiferromagnetic and non-local ordered phases, emerges in the half-filled

one-dimensional case, and is preserved even in presence of a trapping

potential.

\\ ( http://arxiv.org/abs/1009.5931 , 111kb)

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\\

arXiv:1009.5936

Date: Wed, 29 Sep 2010 16:34:25 GMT (610kb)

Title: On the environmental stability of quantum chaotic ratchets

Authors: Gabriel G. Carlo, Leonardo Ermann, F. Borondo, and R. M. Benito

Categories: quant-ph cond-mat.soft

Comments: 6 pages, 5 figures

\\

The transitory and stationary behavior of a quantum chaotic ratchet

consisting of a biharmonic potential under the effect of different drivings in

contact with a thermal environment is studied. For weak forcing and finite

$\hbar$, we identify a strong dependence of the current on the structure of the

chaotic region. Moreover, we have determined the robustness of the current

against thermal fluctuations in the very weak coupling regime. In the case of

strong forcing, the current is determined by the shape of a chaotic attractor.

In both cases the temperature quickly stabilizes the ratchet, but in the latter

it also destroys the asymmetry responsible for the current generation. Finally,

applications to isomerization reactions are discussed.

\\ ( http://arxiv.org/abs/1009.5936 , 610kb)

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\\

arXiv:1009.5978 (*cross-listing*)

Date: Wed, 29 Sep 2010 19:17:39 GMT (2771kb,D)

Title: Condensate-free superfluidity induced by frustrated proximity effect

Authors: Nicolas Laflorencie, Frederic Mila

Categories: cond-mat.str-el cond-mat.quant-gas cond-mat.supr-con quant-ph

Comments: 16 pages and 9 figures, including supplementary information

\\

Since the discovery of superfluidity in He4 and Landau's phenomenological

theory, the relationship between Bose condensation and superfluidity has been

intensely debated. He4 is known by now to be both superfluid and condensed at

low temperature, and more generally, in dimension D \geq 2, all superfluid

bosonic models realized in experiments are condensed in their ground state.

Recent examples include ultracold bosonic atoms trapped in an optical lattice

or effective bosons describing magnetic excitations in quantum magnets. In this

paper, it is shown that a 2D gas of bosons which is superfluid but not

condensed at T=0 can be achieved by populating a layer through a frustrated

proximity effect from a superfluid reservoir. This bosonic fluid is

characterized by specific scaling laws and incommensurate correlations. This

leads to several predictions for the quantum antiferromagnet BaCuSi2O6 (Han

purple) in a magnetic field, a good candidate to realize this novel state of

matter.

\\ ( http://arxiv.org/abs/1009.5978 , 2771kb)

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\\

arXiv:1009.5982

Date: Wed, 29 Sep 2010 19:30:40 GMT (686kb)

Title: Possibility of measuring the thermal Casimir interaction between a plate

and a cylinder attached to a micromachined oscillator

Authors: R. S. Decca, E. Fischbach, G. L. Klimchitskaya, D. E. Krause, D.

Lopez, and V. M. Mostepanenko

Categories: quant-ph cond-mat.mes-hall

Comments: 29 pages, 4 figures, 1 table

\\

We investigate the possibility of measuring the thermal Casimir force and its

gradient in the configuration of a plate and a microfabricated cylinder

attached to a micromachined oscillator. The Lifshitz-type formulas in this

configuration are derived using the proximity force approximation. The accuracy

for the obtained expressions is determined from a comparison with exact results

available in ideal metal case. Computations of the thermal correction to both

the Casimir force and its gradient are performed in the framework of different

theoretical approaches proposed in the literature. The correction to the

Casimir force and its gradient due to lack of parallelism of the plate and

cylinder is determined using the nonmultiplicative approach. The error

introduced in the theory due to the finite length of the cylinder is estimated.

We propose that both static and dynamic experiments measuring the thermal

Casimir interaction between a cylinder and a plate using a micromachined

oscillator can shed additional light on the thermal Casimir force problem.

Specifically, it is shown that the static experiment is better adapted for the

measurement of thermal effects.

\\ ( http://arxiv.org/abs/1009.5982 , 686kb)

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\\

arXiv:1009.6024

Date: Thu, 30 Sep 2010 01:18:11 GMT (10kb)

Title: New Quantum Theory of Laser Cooling Mechanisms

Authors: Xiang-Yao Wu, Xiao-Jing Liu, Bai-Jun Zhang, Yi-Heng Wu, Qing-Cai Wang,

Yan Wang, Nuo Ba and Guang-Huai Wang

Categories: quant-ph physics.atom-ph

\\

In this paper, we study the laser cooling mechanisms with a new quantum

theory approach by applying a new Schrodinger equation, which can describe a

particle in conservative and non-conservative force field. With the new theory,

we prove the atom in laser field can be cooled, and give the atom cooling

temperature, which is accordance with experiment result. Otherwise, we give new

prediction that the atom cooling temperature is directly proportional to the

atom vibration frequency. By calculation, we find they are: $T=0.4334\omega$.

\\ ( http://arxiv.org/abs/1009.6024 , 10kb)

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\\

arXiv:1009.6037

Date: Thu, 30 Sep 2010 04:39:24 GMT (2115kb,D)

Title: Real-Time Imaging of K atoms on Graphite: Interactions and Diffusion

Authors: J. Renard, M. B. Lundeberg, J. A. Folk and Y. Pennec

Categories: cond-mat.mes-hall

\\

Scanning tunneling microscopy (STM) at liquid helium temperature is used to

image potassium adsorbed on graphite at low coverage (~0.02 monolayer). Single

atoms appear as protrusions on STM topographs. A statistical analysis of the

position of the atoms demonstrates repulsion between adsorbates, which is

quantified by comparison with molecular dynamics simulations. This gives access

to the dipole moment of a single adsorbate, found to be 10.5 Debye. Time lapse

imaging shows that long range order is broken by thermally activated diffusion,

with a 32 meV barrier to hopping between graphite lattice sites.

\\ ( http://arxiv.org/abs/1009.6037 , 2115kb)

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\\

arXiv:1009.6044

Date: Thu, 30 Sep 2010 06:12:53 GMT (7kb)

Title: Self-energy effects in the Polchinski and Wick-ordered

renormalization-group approaches

Authors: A. A. Katanin

Categories: cond-mat.str-el math-ph math.MP

Comments: 6 pages

\\

I consider treatment of the self-energy effects in the functional

renormalization group (fRG) schemes, which do not rely on the one-particle

irreducible functional. For the Polchinski scheme the amputation of full

(instead of bare) Green functions improves treatment of the self-energy

effects, but the structure of the corresponding equations is not suitable to

treat strong-coupling problems; it is not also evident, how the mean-field (MF)

solution of these problems is recovered in this scheme. For Wick-ordered scheme

the proper adjustment of the Green function, with respect to which the Wick

ordering is performed, allows to obtain relatively simple form of fRG

hierarchy, which reproduce MF solution and may be suitable for treatment of

strong-coupling problems.

\\ ( http://arxiv.org/abs/1009.6044 , 7kb)

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\\

arXiv:1009.6048 (*cross-listing*)

Date: Thu, 30 Sep 2010 06:46:07 GMT (15kb)

Title: Exact renormalization group and Phi-derivable approximations

Authors: Jean-Paul Blaizot, Jan M. Pawlowski and Urko Reinosa

Categories: hep-ph cond-mat.other hep-th

Comments: 15 pages, 2 figures

\\

We show that the so-called Phi-derivable approximations can be combined with

the exact renormalization group to provide efficient non-perturbative

approximation schemes. On the one hand, the Phi-derivable approximations allow

for a simple truncation of the infinite hierarchy of the renormalization group

flow equations. On the other hand, the flow equations turn the non linear

equations that derive from the Phi-derivable approximations into an initial

value problem, offering new practical ways to solve these equations.

\\ ( http://arxiv.org/abs/1009.6048 , 15kb)

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\\

arXiv:1009.6060

Date: Thu, 30 Sep 2010 08:09:51 GMT (447kb)

Title: Testing isotropy of the universe using the Ramsey resonance technique on

ultracold neutron spins

Authors: I. Altarev, G. Ban, G. Bison, K. Bodek, M. Daum, M. Fertl, P.

Fierlinger, B. Franke, E. Gutsmiedl, W. Heil, R. Henneck, M. Horras, N.

Khomutov, K. Kirch, S. Kistryn, A. Kraft, A. Knecht, P. Knowles, A. Kozela,

T. Lauer, B. Lauss, T. Lefort, Y. Lemi\`ere, A. Mtchedlishvili, O.

Naviliat-Cuncic, A. Pazgalev, G. Petzoldt, F. M. Piegsa, E. Pierre, G.

Pignol, G. Qu\'em\'ener, M. Rebetez, D. Rebreyend, S. Roccia, P.

Schmidt-Wellenburg, N. Severijns, Yu. Sobolev, A. Weis, J. Zejma, J. Zenner,

and G. Zsigmond

Categories: physics.atom-ph hep-ex nucl-ex

Comments: proceedings of the PNCMI2010 conference

\\

Physics at the Planck scale could be revealed by looking for tiny violations

of fundamental symmetries in low energy experiments. In 2008, a sensitive test

of the isotropy of the Universe using has been performed with stored ultracold

neutrons (UCN), this is the first clock-comparison experiment performed with

free neutrons. During several days we monitored the Larmor frequency of neutron

spins in a weak magnetic field using the Ramsey resonance technique. An

non-zero cosmic axial field, violating rotational symmetry, would induce a

daily variation of the precession frequency. Our null result constitutes one of

the most stringent tests of Lorentz invariance to date.

\\ ( http://arxiv.org/abs/1009.6060 , 447kb)

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\\

arXiv:1009.6122

Date: Thu, 30 Sep 2010 13:18:27 GMT (86kb)

Title: A New Method of Calculating the Spin-Wave Velocity $c$ of Spin-1/2

Antiferromagnets With $O(N)$ Symmetry in a Monte Carlo Simulation

Authors: F.-J. Jiang

Categories: cond-mat.str-el hep-lat hep-ph

Comments: 5 pages, 7 figures

\\

Motivated by the so-called cubical regime in magnon chiral perturbation

theory, we propose a new method to calculate the low-energy constant, namely

the spin-wave velocity $c$ of spin-1/2 antiferromagnets with $O(N)$ symmetry in

a Monte Carlo simulation. Specifically we suggest that $c$ can be determined by

$c = L/\beta$ when the squares of the spatial and temporal winding numbers are

tuned to be the same in the Monte Carlo calculations. Here $\beta$ and $L$ are

the inverse temperature and the box size used in the simulations when this

condition is met. We verify the validity of this idea by simulating the quantum

spin-1/2 XY model. The $c$ obtained by using the squares of winding numbers is

given by $c = 1.1348(5)Ja$ which is consistent with the known values of $c$ in

the literature. Unlike other conventional approaches, our new idea provides a

direct method to measure $c$. Further, by simultaneously fitting our Monte

Carlo data of susceptibilities $\chi_{11}$ and spin susceptibilities $\chi$ to

their theoretical predictions from magnon chiral perturbation theory, we find

$c$ is given by $c = 1.1347(2)Ja$ which agrees with the one we obtain by the

new method of using the squares of winding numbers. The low-energy constants

magnetization density ${\cal M}$ and spin stiffenss $\rho$ of quantum spin-1/2

XY model are determined as well and are given by ${\cal M} = 0.43561(1)/a^2$

and $\rho = 0.26974(5)J$, respectively. Thanks to the prediction power of

magnon chiral perturbation theory which puts a very restricted constraint among

the low-energy constants for the model considered here, the accuracy of ${\cal

M}$ we present in this study is much precise than previous Monte Carlo result.

\\ ( http://arxiv.org/abs/1009.6122 , 86kb)

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\\

arXiv:1009.6126

Date: Thu, 30 Sep 2010 13:36:52 GMT (665kb)

Title: Coherence of large-scale entanglement

Authors: Thomas Monz, Philipp Schindler, Julio T. Barreiro, Michael Chwalla,

Daniel Nigg, William A. Coish, Maximilian Harlander, Wolfgang Haensel, Markus

Hennrich, and Rainer Blatt

Categories: quant-ph

Comments: 4 pages, 3 figures, 1 table

\\

We report the creation of large Schroedinger-Cat states with up to 14 qubits.

By investigating their coherence over time, we observe a decay proportional to

the square of the number of qubits. The observed decay agrees with our

theoretical model which assumes a system affected only by correlated, Gaussian

phase noise. Our model holds for the majority of current experimental systems

developed towards quantum computation and quantum metrology.

\\ ( http://arxiv.org/abs/1009.6126 , 665kb)

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\\

arXiv:1009.6196

Date: Thu, 30 Sep 2010 17:08:03 GMT (749kb,D)

Title: Acoustic white holes in flowing atomic Bose-Einstein condensates

Authors: Carlos Mayoral, Alessio Recati, Alessandro Fabbri, Renaud Parentani,

Roberto Balbinot, Iacopo Carusotto

Categories: cond-mat.quant-gas gr-qc hep-th

\\

We study acoustic white holes in a steadily flowing atomic Bose-Einstein

condensate. A white hole configuration is obtained when the flow velocity goes

from a super-sonic value in the upstream region to a sub-sonic one in the

downstream region. The scattering of phonon wavepackets on a white hole horizon

is numerically studied in terms of the Gross-Pitaevskii equation of mean-field

theory: dynamical stability of the acoustic white hole is found, as well as a

signature of a nonlinear back-action of the incident phonon wavepacket onto the

horizon. The correlation pattern of density fluctuations is numerically studied

by means of the truncated-Wigner method which includes quantum fluctuations.

Signatures of the white hole radiation of correlated phonon pairs by the

horizon are characterized; analogies and differences with Hawking radiation

from acoustic black holes are discussed. In particular, a short wavelength

feature is identified in the density correlation function, whose amplitude

steadily grows in time since the formation of the horizon. The numerical

observations are quantitatively interpreted by means of an analytical

Bogoliubov theory of quantum fluctuations for a white hole configuration within

the step-like horizon approximation.

\\ ( http://arxiv.org/abs/1009.6196 , 749kb)

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\\

arXiv:1009.6213

Date: Thu, 30 Sep 2010 18:16:19 GMT (29kb)

Title: Solid phases and pairing in a mixture of polar molecules and atoms

Authors: B. Capogrosso-Sansone

Categories: cond-mat.stat-mech cond-mat.other

Comments: 5 pages, 4 figures

\\

We consider a mixture of hard core bosonic polar molecules, interacting via

repulsive dipole-dipole interaction, and one atomic bosonic species. The

mixture is confined on a two-dimensional square lattice and, at low enough

temperatures, can be described by the two-component Bose-Hubbard model. The

latter displays a extremely rich phase diagram including solid, superfluid,

supersolid phases. Here we mainly focus on the checkerboard molecular solid,

stabilized by the long range dipolar interaction, and study how the presence of

atoms affects its robustness both at zero and finite temperature. We find that,

due to atom-molecule interaction, solid phases can be stabilized at both,

(much) lower strengths of dipolar interaction and higher temperatures, than

when no atoms are present. As a byproduct, atoms also order in a solid phase

with same melting temperatures as for molecules. Finally, we find that for

large enough interaction between atoms and molecules a paired supersolid phase

can be stabilized.

\\ ( http://arxiv.org/abs/1009.6213 , 29kb)

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The replacements:

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\\

arXiv:0910.3314

replaced with revised version Fri, 24 Sep 2010 12:54:34 GMT (166kb)

Title: Dynamics of fluctuations in an optical analog of the Laval nozzle

Authors: I. Fouxon, O.V. Farberovich, S. Barad, and V. Fleurov

Categories: physics.optics

Comments: 7 pages, 4 figures

\\ ( http://arxiv.org/abs/0910.3314 , 166kb)

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\\

arXiv:1005.0461

replaced with revised version Fri, 24 Sep 2010 14:37:34 GMT (73kb)

Title: Super-Tonks-Girardeau gas of spin-1/2 interacting fermions

Authors: Liming Guan and Shu Chen

Categories: cond-mat.quant-gas

Comments: 4.1 pages, 5 figures, version accepted for publication in Phys. Rev.

Lett

\\ ( http://arxiv.org/abs/1005.0461 , 73kb)

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\\

arXiv:1008.4794

replaced with revised version Fri, 24 Sep 2010 17:59:52 GMT (330kb)

Title: Generalized Thermalization in Integrable Systems

Authors: Amy C. Cassidy, Charles W. Clark, Marcos Rigol

Categories: cond-mat.stat-mech cond-mat.quant-gas

Comments: 7 pages, 7 figures

\\ ( http://arxiv.org/abs/1008.4794 , 330kb)

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\\

arXiv:1005.2483

replaced with revised version Sun, 26 Sep 2010 17:51:55 GMT (399kb)

Title: Disordered one-dimensional Bose-Fermi mixtures: The Bose-Fermi glass

Authors: Fran\c{c}ois Cr\'epin, Gergely Zar\'and, Pascal Simon

Categories: cond-mat.quant-gas cond-mat.str-el

Comments: 4 pages, 2 figures

Journal-ref: Phys. Rev. Lett. 105, 115301 (2010)

DOI: 10.1103/PhysRevLett.105.115301

\\ ( http://arxiv.org/abs/1005.2483 , 399kb)

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\\

arXiv:1001.1552

replaced with revised version Sun, 26 Sep 2010 19:41:07 GMT (239kb)

Title: Describing systems of interacting fermions by boson models: exact

mapping in arbitrary dimension and applications

Authors: K. B. Efetov, C. P\'epin, H. Meier

Categories: cond-mat.str-el cond-mat.quant-gas

Comments: Qualitative discussion of subsections IVc-IVe is modified. Figure 8

is added

\\ ( http://arxiv.org/abs/1001.1552 , 239kb)

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\\

arXiv:1004.4797

replaced with revised version Mon, 27 Sep 2010 08:30:08 GMT (299kb)

Title: Slowing polar molecules using a wire Stark decelerator

Authors: Adela Marian, Henrik Haak, Peter Geng, and Gerard Meijer

Categories: physics.atom-ph

Comments: updated version, added journal reference

Journal-ref: Eur. Phys. J. D 59, 179-181 (2010)

DOI: 10.1140/epjd/e2010-00143-3

\\ ( http://arxiv.org/abs/1004.4797 , 299kb)

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\\

arXiv:1005.4738

replaced with revised version Mon, 27 Sep 2010 11:50:51 GMT (4232kb)

Title: Splitting and oscillation of Majorana zero modes in the p-wave BCS-BEC

evolution with plural vortices

Authors: T. Mizushima, K. Machida

Categories: cond-mat.quant-gas cond-mat.supr-con

Comments: 15 pages, 10 figures

Journal-ref: Phys. Rev. A 82, 023624 (2010)

DOI: 10.1103/PhysRevA.82.023624

\\ ( http://arxiv.org/abs/1005.4738 , 4232kb)

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\\

arXiv:1009.4514

replaced with revised version Mon, 27 Sep 2010 19:10:09 GMT (679kb)

Title: Macroscopic Superposition of Ultracold Atoms with Orbital Degrees of

Freedom

Authors: M. A. Garcia-March, D. R. Dounas-Frazer, and Lincoln D. Carr

Categories: cond-mat.quant-gas

Comments: 21 pages, 9 figures

\\ ( http://arxiv.org/abs/1009.4514 , 679kb)

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\\

arXiv:1001.1044 (*cross-listing*)

replaced with revised version Mon, 27 Sep 2010 19:32:59 GMT (110kb)

Title: Relativistic Bose-Einstein Condensates: a new system for analogue models

of gravity

Authors: Serena Fagnocchi, Stefano Finazzi, Stefano Liberati, Marton Kormos,

and Andrea Trombettoni

Categories: gr-qc cond-mat.quant-gas

Comments: 20 pages, 1 figure. Accepted for publication in New Journal of

Physics (Focus issue on "Classical and Quantum Analogues for Gravitational

Phenomena and Related Effects") on 25 Mar 2010

\\ ( http://arxiv.org/abs/1001.1044 , 110kb)

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\\

arXiv:0910.1518

replaced with revised version Tue, 28 Sep 2010 01:20:49 GMT (857kb)

Title: Quantum fluctuations and condensate fraction during the time-of-flight

expansion

Authors: Shiang Fang, Ray-Kuang Lee, and Daw-Wei Wang

Categories: cond-mat.quant-gas cond-mat.other

Comments: 4 pages and 3 figures, the same as the published version

Journal-ref: Phys. Rev. A (Rapid Commun.) 82, 031601 (2010)

DOI: 10.1103/PhysRevA.82.031601

\\ ( http://arxiv.org/abs/0910.1518 , 857kb)

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\\

arXiv:0912.3350 (*cross-listing*)

replaced with revised version Tue, 28 Sep 2010 11:07:18 GMT (52kb)

Title: Introduction to Quantum Integrability

Authors: Anastasia Doikou, Stefano Evangelisti, Giovanni Feverati, Nikos

Karaiskos

Categories: math-ph cond-mat.stat-mech hep-th math.MP nlin.SI

Comments: 56 pages, Latex. A few typos corrected

Report-no: LAPTH-1367/09

Journal-ref: Int.J.Mod.Phys.A25:3307-3351,2010

DOI: 10.1142/S0217751X10049803

\\ ( http://arxiv.org/abs/0912.3350 , 52kb)

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\\

arXiv:1005.5284

replaced with revised version Tue, 28 Sep 2010 11:34:09 GMT (697kb,D)

Title: Generalized Hartree-Fock Theory for Interacting Fermions in Lattices:

Numerical Methods

Authors: Christina V. Kraus and J. Ignacio Cirac

Categories: quant-ph cond-mat.other

Comments: 16 pages, 22 figures

\\ ( http://arxiv.org/abs/1005.5284 , 697kb)

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\\

arXiv:0911.0849

replaced with revised version Tue, 28 Sep 2010 11:34:56 GMT (14kb,D)

Title: "Moth-eaten effect" driven by Pauli blocking, revealed for Cooper pairs

Authors: W. V. Pogosov, M. Combescot

Categories: cond-mat.supr-con cond-mat.quant-gas

Comments: 5 pages, 1 figure, to be published in Pis'ma v ZhETF (JETP Letters)

\\ ( http://arxiv.org/abs/0911.0849 , 14kb)

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\\

arXiv:0912.4236

replaced with revised version Tue, 28 Sep 2010 14:13:38 GMT (365kb)

Title: Scaling Flows and Dissipation in the Dilute Fermi Gas at Unitarity

Authors: Thomas Schaefer (North Carolina State University) and Clifford Chafin

(North Carolina State University)

Categories: cond-mat.quant-gas hep-ph nucl-th

Comments: 32 pages, prepared for "BCS-BEC crossoverand the Unitary Fermi Gas",

Lecture Notes in Physics, W. Zwerger (editor), Fig. 5 corrected, note added;

final version, corrected typo in equ. 93

\\ ( http://arxiv.org/abs/0912.4236 , 365kb)

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\\

arXiv:0910.1803

replaced with revised version Tue, 28 Sep 2010 14:41:21 GMT (425kb,D)

Title: Pi-phases in balanced fermionic superfluids on spin-dependent optical

lattices

Authors: I. Zapata and B. Wunsch and N. T. Zinner and E. Demler

Categories: cond-mat.quant-gas cond-mat.mes-hall cond-mat.str-el cond-mat.supr-con

Comments: 4.3 pages, 4 figures, published version

Journal-ref: Phys. Rev. Lett. 105, 095301 (2010)

DOI: 10.1103/PhysRevLett.105.095301

\\ ( http://arxiv.org/abs/0910.1803 , 425kb)

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\\

arXiv:1007.3502

replaced with revised version Tue, 28 Sep 2010 15:10:42 GMT (1451kb)

Title: Interaction effects and quantum phase transitions in topological

insulators

Authors: Christopher N. Varney, Kai Sun, Marcos Rigol, and Victor Galitski

Categories: cond-mat.str-el

Comments: 13 pages, 12 figures. Published version

Journal-ref: Phys. Rev. B 82, 115125 (2010)

DOI: 10.1103/PhysRevB.82.115125

\\ ( http://arxiv.org/abs/1007.3502 , 1451kb)

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\\

arXiv:0907.0625 (*cross-listing*)

replaced with revised version Tue, 28 Sep 2010 16:03:21 GMT (582kb)

Title: Dark solitons near the Mott-insulator--superfluid phase transition

Authors: K.V.Krutitsky, J.Larson, M.Lewenstein

Categories: cond-mat.quant-gas quant-ph

DOI: 10.1103/PhysRevA.82.033618

\\ ( http://arxiv.org/abs/0907.0625 , 582kb)

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\\

arXiv:1006.2478 (*cross-listing*)

replaced with revised version Tue, 28 Sep 2010 16:47:52 GMT (2016kb)

Title: Anyonic entanglement renormalization

Authors: Robert Koenig and Ersen Bilgin

Categories: cond-mat.str-el quant-ph

Comments: 19 pages, 10 figures, v2: extended, updated to match published

version

Journal-ref: Phys. Rev. B 82, 125118 (2010)

DOI: 10.1103/PhysRevB.82.125118

\\ ( http://arxiv.org/abs/1006.2478 , 2016kb)

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\\

arXiv:1004.5035

replaced with revised version Tue, 28 Sep 2010 21:03:02 GMT (454kb)

Title: 1D Quantum Liquids with Power-Law Interactions: a Luttinger Staircase

with Polar Molecules

Authors: M. Dalmonte, G. Pupillo, P. Zoller

Categories: cond-mat.quant-gas

Comments: 4 pages, 3 figures, one table, updated discussions in Pag 2, 4

Journal-ref: Phys. Rev. Lett. 105, 140401 (2010)

\\ ( http://arxiv.org/abs/1004.5035 , 454kb)

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\\

arXiv:1007.4953

replaced with revised version Wed, 29 Sep 2010 01:39:26 GMT (1121kb,D)

Title: Route to turbulence in Bose-Einstein Condensate: Evolution of spatial

structures

Authors: J. A. Seman, E. A. L. Henn, R. F. Shiozaki, G. Roati, F. J.

Poveda-Cuevas, K. M. F. Magalh\~aes, V. I. Yukalov, M. Tsubota, M. Kobayashi,

K. Kasamatsu and V. S. Bagnato

Categories: cond-mat.quant-gas

Comments: 4 pages, 3 figures

\\ ( http://arxiv.org/abs/1007.4953 , 1121kb)

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\\

arXiv:1006.5167

replaced with revised version Wed, 29 Sep 2010 05:33:51 GMT (194kb)

Title: Demonstration of double EIT using coupled harmonic oscillators and RLC

circuits

Authors: Joshua Harden, Amitabh Joshi, and Juan D. Serna

Categories: quant-ph physics.class-ph physics.ed-ph

Comments: REVTeX, 9 pages, 10 figures. Revised version, corrected formulas and

figure labels, added references

\\ ( http://arxiv.org/abs/1006.5167 , 194kb)

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\\

arXiv:1009.3257

replaced with revised version Wed, 29 Sep 2010 07:05:58 GMT (344kb)

Title: Stable Fulde-Ferrell-Larkin-Ovchinnikov pairing states in 2D and 3D

optical lattices

Authors: Zi Cai, Yupeng Wang, and Congjun Wu

Categories: cond-mat.quant-gas

\\ ( http://arxiv.org/abs/1009.3257 , 344kb)

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\\

arXiv:1006.1495

replaced with revised version Wed, 29 Sep 2010 13:43:23 GMT (64kb)

Title: Fast optimal transition between two equilibrium states

Authors: Jean-Fran\c{c}ois Schaff, Xiao-Li Song, Patrizia Vignolo, and

Guillaume Labeyrie

Categories: cond-mat.quant-gas

Comments: 5 pages, 4 figures, revised version

Journal-ref: Phys. Rev. A 82, 033430 (2010)

DOI: 10.1103/PhysRevA.82.033430

\\ ( http://arxiv.org/abs/1006.1495 , 64kb)

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\\

arXiv:1009.3756 (*cross-listing*)

replaced with revised version Wed, 29 Sep 2010 18:28:50 GMT (0kb,I)

Title: Time-resolved detection of relative intensity squeezed nanosecond pulses

in a 87Rb vapor

Authors: Imad H. Agha, Christina Giarmatzi, Gaetan Messin, and Philippe

Grangier

Categories: physics.optics physics.atom-ph quant-ph

Comments: This paper has been withdrawn by the authors. Major changes to

theoretical section and authorship order change. Will be resubmitted after

required changes are implemented to the manuscript

\\ ( http://arxiv.org/abs/1009.3756 , 0kb)

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\\

arXiv:1009.2969 (*cross-listing*)

replaced with revised version Thu, 30 Sep 2010 03:01:47 GMT (1471kb,D)

Title: Observation of quantum jumps in a superconducting artificial atom

Authors: R. Vijay, D. H. Slichter, and I. Siddiqi

Categories: cond-mat.mes-hall cond-mat.supr-con quant-ph

Comments: Updated draft including minor corrections and reformatting. 5 pages,

4 figures. Supplementary videos are available on our website at

http://physics.berkeley.edu/research/siddiqi/docs/supps/

\\ ( http://arxiv.org/abs/1009.2969 , 1471kb)

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\\

arXiv:1006.3532 (*cross-listing*)

replaced with revised version Thu, 30 Sep 2010 05:50:11 GMT (408kb)

Title: Simulation of anyons with tensor network algorithms

Authors: Robert N. C. Pfeifer, Philippe Corboz, Oliver Buerschaper, Miguel

Aguado, Matthias Troyer, Guifre Vidal

Categories: cond-mat.str-el cond-mat.mes-hall quant-ph

Comments: Fixed typos, matches published version. 16 pages, 21 figures, 4

tables, RevTeX 4-1. For a related work, see arXiv:1006.2478

Journal-ref: Physical Review B 82, 115126 (2010)

DOI: 10.1103/PhysRevB.82.115126

\\ ( http://arxiv.org/abs/1006.3532 , 408kb)

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\\

arXiv:1004.1541

replaced with revised version Thu, 30 Sep 2010 13:26:02 GMT (52kb)

Title: Huge quantum particle number fluctuations in a two-component Bose gas in

a double-well potential

Authors: Pawel Zin, Bartlomiej Oles, and Krzysztof Sacha

Categories: cond-mat.quant-gas

Comments: 4 pages, 2 figures, revised version

\\ ( http://arxiv.org/abs/1004.1541 , 52kb)

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\\

arXiv:1005.2649 (*cross-listing*)

replaced with revised version Thu, 30 Sep 2010 14:50:52 GMT (305kb)

Title: System size scaling of topological defect creation in a second-order

dynamical quantum phase transition

Authors: Michael Uhlmann, Ralf Sch\"utzhold, Uwe R. Fischer

Categories: cond-mat.stat-mech gr-qc quant-ph

Comments: 20 pages of IOP style, 6 figures; as published in New Journal of

Physics

Journal-ref: New J. Phys. 12, 095020 (2010)

DOI: 10.1088/1367-2630/12/9/095020

\\ ( http://arxiv.org/abs/1005.2649 , 305kb)

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\\

arXiv:1006.2975 (*cross-listing*)

replaced with revised version Thu, 30 Sep 2010 15:01:04 GMT (242kb,D)

Title: Cold atom simulation of interacting relativistic quantum field theories

Authors: J. Ignacio Cirac, Paolo Maraner and Jiannis K. Pachos

Categories: cond-mat.str-el hep-lat hep-th quant-ph

Comments: 5 pages, 3 figues, Phys. Rev. Lett. version with supplement

\\ ( http://arxiv.org/abs/1006.2975 , 242kb)

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\\

arXiv:1006.0636

replaced with revised version Thu, 30 Sep 2010 16:35:05 GMT (816kb)

Title: Stabilization and pumping of giant vortices in dilute Bose-Einstein

condensates

Authors: Pekko Kuopanportti and Mikko M\"ott\"onen

Categories: cond-mat.quant-gas

Comments: 8 pages, 6 figures; to be published in J. Low Temp. Phys., online

publication available at http://dx.doi.org/10.1007/s10909-010-0216-1

\\ ( http://arxiv.org/abs/1006.0636 , 816kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Associate Professor in Physics School of Mathematics and Physics, ph : +61 7 334 69824 The University of Queensland, fax : +61 7 336 51242 Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au Australia. www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland ========================================================================= _______________________________________________ Matts-arxiv mailing list Matts-arxiv_at_lists.sps.uq.edu.auReceived on Thu Nov 11 2010 - 17:36:55 EST

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