# [Matts-arxiv] Matt's arXiv selection: week ending 1 October 2010

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
We discuss theoretically ion-atom collisions at low energy and predict the
possibility of formation of cold molecular ion by photoassociation 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
\\
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
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
\\
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
\\
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
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
\\
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,
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
\\
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
Categories: cond-mat.str-el
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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
\\
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:

------------------------------------------------------------------------------
\\
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
\\ ( 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
\\ ( 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
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
\\ ( 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
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
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
\\ ( 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
\\ ( 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
\\ ( 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
\\ ( 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
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/
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