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

Date: Fri, 11 Sep 2009 19:26:35 +1000

Date: Fri, 11 Sep 2009 19:26:35 +1000

Dear subscribers,

This was a big week: 44 new preprints and 24 replacements.

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arXiv:0907.1267 (*cross-listing*)

Date: Tue, 7 Jul 2009 17:18:12 GMT (10kb)

Title: On the speed of fluctuations around thermodynamic equilibrium

Authors: Noah Linden, Sandu Popescu, Anthony J Short, Andreas Winter

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

\\

We study the speed of fluctuation of a quantum system around its

thermodynamic equilibrium state, and show that the speed will be extremely

small for almost all times in typical thermodynamic cases. The setting

considered here is that of a quantum system couples to a bath, both jointly

described as a closed system. This setting, is the same as the one considered

in [N. Linden et al., Phys. Rev. E 79:061103 (2009)] and the ``thermodynamic

equilibrium state'' refers to a situation that includes the usual thermodynamic

equilibrium case, as well as far more general situations.

\\ ( http://arxiv.org/abs/0907.1267 , 10kb)

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arXiv:0907.1587 (*cross-listing*)

Date: Thu, 9 Jul 2009 15:32:47 GMT (529kb)

Title: Continuum multi-physics modeling with scripting languages: the Nsim

simulation compiler prototype for classical field theory

Authors: Thomas Fischbacher and Hans Fangohr

Categories: physics.comp-ph cond-mat.mes-hall cs.DC

Comments: 50 pages, 5 figures

\\

We demonstrate that for a broad class of physical systems that can be

described using classical field theory, automated runtime translation of the

physical equations to parallelized finite-element numerical simulation code is

feasible. This allows the implementation of multiphysics extension modules to

popular scripting languages (such as Python) that handle the complete

specification of the physical system at script level. We discuss two example

applications that utilize this framework: the micromagnetic simulation package

"Nmag" as well as a short Python script to study morphogenesis in a

reaction-diffusion model.

\\ ( http://arxiv.org/abs/0907.1587 , 529kb)

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arXiv:0907.4179

Date: Thu, 23 Jul 2009 21:53:15 GMT (362kb)

Title: EDM searches based on alkali or alkaline earth bearing molecules

Authors: Edmund R. Meyer and John L. Bohn

Categories: physics.atom-ph

Comments: 6 pages, two column format, 5 figures, submitted to Phys. Rev. A

\\

We introduce four new molecules -- YbRb, YbCs, YbSr$^+$, and YbBa$^+$ -- that

may prove fruitful in experimental searches for the electric dipole moment

(EDM) of the electron. These molecules can, in principle, be prepared at

extremely low temperatures by photoassociating ultracold atoms, and therefore

may present an advantage over molecular beam experiments. Here we discuss

properties of these molecules and assess the effective electric fields they

contribute to an electron EDM measurement.

\\ ( http://arxiv.org/abs/0907.4179 , 362kb)

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arXiv:0907.3996 (*cross-listing*)

Date: Thu, 23 Jul 2009 07:41:00 GMT (13kb)

Title: Diffusion Approximation of Stochastic Master Equations with Jumps

Authors: Clement Pellegrini and Francesco Petruccione

Categories: math-ph math.MP quant-ph

Comments: 15 pages

\\

In the presence of quantum measurements with direct photon detection the

evolution of open quantum systems is usually described by stochastic master

equations with jumps. Heuristically, from these equations one can obtain

diffusion models as approximation. A necessary condition for a general

diffusion approximation for jump master equations is presented. This

approximation is rigorously proved by using techniques for Markov process which

are based upon the convergence of Markov generators and martingale problems.

This result is illustrated by rigorously obtaining the diffusion approximation

for homodyne and heterodyne detection.

\\ ( http://arxiv.org/abs/0907.3996 , 13kb)

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arXiv:0907.4485 (*cross-listing*)

Date: Sun, 26 Jul 2009 13:56:05 GMT (17kb)

Title: Double Well Potential: Perturbation Theory, Tunneling, WKB (beyond

instantons)

Authors: Alexander V Turbiner

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

Comments: 13 pages, invited talk at "Crossing the boundaries: Gauge dynamics at

strong coupling (Shifmania)", Minneapolis, May 14-17, 2009

\\

A simple approximate solution for the quantum-mechanical quartic oscillator

$V= m^2 x^2+g x^4$ in the double-well regime $m^2<0$ at arbitrary $g \geq 0$ is

presented. It is based on a combining of perturbation theory near true minima

of the potential, semi-classical approximation at large distances and a

description of tunneling under the barrier. It provides 9-10 significant digits

in energies and gives for wavefunctions the relative deviation in real

$x$-space less than $\lesssim 10^{-3}$.

\\ ( http://arxiv.org/abs/0907.4485 , 17kb)

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arXiv:0907.4250

Date: Fri, 24 Jul 2009 10:09:10 GMT (1482kb)

Title: Experimental Results Related to Discrete Nonlinear Schr\"odinger

Equations

Authors: Mason A. Porter

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

Comments: 17 pages, review article

\\

In this chapter, we discuss experiments that realize the discrete nonlinear

Schr\"odinger (DNLS) equations. The relevance of such descriptions arises from

the competition of three common features: nonlinearity, dispersion, and a

medium to large level of (periodic, quasiperiodic, or random) discreteness in

space. DNLS equations have been especially prevalent in atomic and molecular

physics in the study of Bose-Einstein condensates in optical lattices or

superlattices; and in nonlinear optics in the description of pulse propagation

in waveguide arrays and photorefractive crystals. New experiments in both

nonlinear optics and Bose-Einstein condensation provide new challenges for DNLS

models, and DNLS and related equations have also recently been used to make

important predictions in novel physical settings such as the study of composite

metamaterials and arrays of superconducting devices.

\\ ( http://arxiv.org/abs/0907.4250 , 1482kb)

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arXiv:0907.4315

Date: Fri, 24 Jul 2009 18:10:17 GMT (120kb)

Title: Long Range Free Bosonic Models in Block Decimation Notation:

Applications and Entanglement

Authors: Jose Reslen and Sougato Bose

Categories: quant-ph

Comments: 4 pages, 3 figures, comments are welcome

\\

We study the effect of long range particle exchange in bosonic arrangements.

We show that by combining the solution of the Heisenberg equations of motion

with matrix product state representation it is possible to investigate the

dynamics as well as the ground state while including particle exchange beyond

next-neighbours sites. These ideas are then applied to study the emergence of

entanglement as a result of scattering in boson chains. We propose a scheme to

generate highly entangled multi-particle states that exploits collision as a

powerful entangling mechanism.

\\ ( http://arxiv.org/abs/0907.4315 , 120kb)

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arXiv:0907.4305

Date: Fri, 24 Jul 2009 14:42:06 GMT (152kb)

Title: Bogoliubov Theory of acoustic Hawking radiation in Bose-Einstein

Condensates

Authors: A. Recati, N. Pavloff, I. Carusotto

Categories: cond-mat.quant-gas

Comments: 11 pages, 7 figures

\\

We apply the microscopic Bogoliubov theory of dilute Bose-Einstein

condensates to analyze quantum and thermal fluctuations in a flowing atomic

condensate in the presence of a sonic horizon. For the simplest case of a

step-like horizon, closed-form analytical expressions are found for the

spectral distribution of the analog Hawking radiation and for the density

correlation function. The peculiar long-distance density correlations that

appear as a consequence of the Hawking emission features turns out to be

reinforced by a finite initial temperature of the condensate. The analytical

results are in good quantitative agreement with first principle numerical

calculations.

\\ ( http://arxiv.org/abs/0907.4305 , 152kb)

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arXiv:0907.4314

Date: Fri, 24 Jul 2009 15:05:40 GMT (813kb)

Title: Control of unstable macroscopic oscillations in the dynamics of three

coupled Bose condensates

Authors: P. Buonsante, R. Franzosi, V. Penna

Categories: cond-mat.quant-gas

Comments: 25 pages, 12 figures

Journal-ref: J. Phys. A: Math. Theor. 42 (2009) 285307

DOI: 10.1088/1751-8113/42/28/285307

\\

We study the dynamical stability of the macroscopic quantum oscillations

characterizing a system of three coupled Bose-Einstein condensates arranged

into an open-chain geometry. The boson interaction, the hopping amplitude and

the central-well relative depth are regarded as adjustable parameters. After

deriving the stability diagrams of the system, we identify three mechanisms to

realize the transition from an unstable to stable behavior and analyze specific

configurations that, by suitably tuning the model parameters, give rise to

macroscopic effects which are expected to be accessible to experimental

observation. Also, we pinpoint a system regime that realizes a

Josephson-junction-like effect. In this regime the system configuration do not

depend on the model interaction parameters, and the population oscillation

amplitude is related to the condensate-phase difference. This fact makes

possible estimating the latter quantity, since the measure of the oscillating

amplitudes is experimentally accessible.

\\ ( http://arxiv.org/abs/0907.4314 , 813kb)

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arXiv:0907.4393

Date: Fri, 24 Jul 2009 23:01:34 GMT (392kb)

Title: Kink-antikink vortex transfer in periodic-plus-random pinning potential:

Theoretical analysis and numerical experiments

Authors: W.V. Pogosov, H.J. Zhao, V.R. Misko, and F.M. Peeters

Categories: cond-mat.supr-con

Comments: 4 pages, 4 figures

\\

The influence of random pinning on the vortex dynamics in a periodic square

potential under an external drive is investigated. Using theoretical approach

and numerical experiments, we found several dynamical phases of vortex motion

that are different from the ones for a regular pinning potential. Vortex

transfer is controlled by kinks and antikinks, which either preexist in the

system or appear spontaneously in pairs and then propagate in groups. When

kinks and antikinks collide, they annihilate.

\\ ( http://arxiv.org/abs/0907.4393 , 392kb)

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arXiv:0907.4228

Date: Fri, 24 Jul 2009 07:00:41 GMT (162kb)

Title: Exact ground states and correlation functions of chain and ladder models

of interacting hardcore bosons or spinless fermions

Authors: Siew-Ann Cheong and Christopher L. Henley

Categories: cond-mat.str-el cond-mat.supr-con

Comments: 20 pages, 18 figures, RevTeX4 class

\\

By removing one empty site between two occupied sites, we map the ground

states of chains of hardcore bosons and spinless fermions with infinite

nearest-neighbor repulsion to ground states of chains of hardcore bosons and

spinless fermions without nearest-neighbor repulsion respectively, and

ultimately in terms of the one-dimensional Fermi sea. We then introduce the

intervening-particle expansion, where we write correlation functions in such

ground states as a systematic sum over conditional expectations, each of which

can be ultimately mapped to a one-dimensional Fermi-sea expectation. Various

ground-state correlation functions are calculated for the bosonic and fermionic

chains with infinite nearest-neighbor repulsion, as well as for a ladder model

of spinless fermions with infinite nearest-neighbor repulsion and correlated

hopping in three limiting cases. We find that the decay of these correlation

functions are governed by surprising power-law exponents.

\\ ( http://arxiv.org/abs/0907.4228 , 162kb)

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arXiv:0907.4328

Date: Fri, 24 Jul 2009 16:06:20 GMT (140kb)

Title: Emergence of Levy statistics in many-particle quantum systems

Authors: A. V. Ponomarev, S. Denisov, P. Hanggi

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

Comments: 4 pages, 4 figures

\\

We consider a system of N strongly interacting (hard-core) bosons at finite

temperatures on a one-dimensional optical lattice with parabolic confinement.

Using two complimentary approaches, canonical and grand-canonical formalisms,

we discovered that the system momentum distribution obeys Levy statistics. The

tunable Levy spline reproduces momentum distributions in the entire

experimentally accessible region, including the first-order diffraction peak.

Our finding allows for calibration of different quantum states by using a

unique scaling exponent and provides an excellent approximation to recent

experimental observations (B. Paredes et al., Nature 429, 277 (2004)).

\\ ( http://arxiv.org/abs/0907.4328 , 140kb)

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arXiv:0907.4360

Date: Fri, 24 Jul 2009 18:54:54 GMT (23kb)

Title: Duality, Quantum Skyrmions and the Stability of an SO(3) Two-Dimensional

Quantum Spin-Glass

Authors: C.M.S. da Conceicao and E.C.Marino

Categories: cond-mat.dis-nn

Comments: 10 pages, 1 figure

\\

Quantum topological excitations (skyrmions) are analyzed from the point of

view of their duality to spin excitations in the different phases of a

disordered two-dimensional, short-range interacting, SO(3) quantum magnetic

system of Heisenberg type. The phase diagram displays all the phases, which are

allowed by the duality relation. We study the large distance behavior of the

two-point correlation function of quantum skyrmions in each of these phases

and, out of this, extract information about the energy spectrum and

non-triviality of these excitations. The skyrmion correlators present a

power-law decay in the spin-glass(SG)-phase, indicating that these quantum

topological excitations are gapless but nontrivial in this phase. The SG phase

is dual to the AF phase, in the sense that topological and spin excitations are

respectively gapless in each of them. The Berezinskii-Kosterlitz-Thouless

mechanism guarantees the survival of the SG phase at $T \neq 0$, whereas the AF

phase is washed out to T=0 by the quantum fluctuations. Our results suggest a

new, more symmetric way of characterizing a SG-phase: one for which both the

order and disorder parameters vanish, namely $<\sigma > = 0 $, $<\mu > =0 $,

where $\sigma$ is the spin and $\mu$ is the topological excitation operators.

\\ ( http://arxiv.org/abs/0907.4360 , 23kb)

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arXiv:0907.4261

Date: Fri, 24 Jul 2009 11:15:34 GMT (111kb)

Title: Manipulating mesoscopic multipartite entanglement with atom-light

interfaces

Authors: Julia Stasi\'nska, Carles Rod\'o, Simone Paganelli, Gerhard Birkl and

Anna Sanpera

Categories: quant-ph

Comments: 8 pages, 6 figures

\\

Entanglement between two macroscopic atomic ensembles induced by measurement

on an ancillary light system has proven to be a powerful method for engineering

quantum memories and quantum state transfer. Here we investigate the

feasibility of such methods for generation, manipulation and detection of

genuine multipartite entanglement between mesoscopic atomic ensembles. Our

results extend in a non trivial way the EPR entanglement between two

macroscopic gas samples reported experimentally in [B. Julsgaard, A. Kozhekin,

and E. Polzik, Nature {\bf 413}, 400 (2001)]. We find that under realistic

conditions, a second orthogonal light pulse interacting with the atomic

samples, can modify and even reverse the entangling action of the first one

leaving the samples in a separable state.

\\ ( http://arxiv.org/abs/0907.4261 , 111kb)

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arXiv:0907.4267

Date: Fri, 24 Jul 2009 11:47:22 GMT (4kb)

Title: Energy average formula of photon gas rederived by using the generalized

Hermann-Feynman theorem

Authors: Hong-yi Fan

Categories: quant-ph

Comments: 2 pages

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By virtue of the generalized Hermann-Feynmam theorem and the method of

characteristics we rederive energy average formula of photon gas, this is

another useful application of the theorem.

\\ ( http://arxiv.org/abs/0907.4267 , 4kb)

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arXiv:0907.4275

Date: Fri, 24 Jul 2009 12:46:26 GMT (2068kb,D)

Title: Observation of St\"uckelberg oscillations in dipole-dipole interactions

Authors: C. S. E. van Ditzhuijzen, Atreju Tauschinsky, H. B. van Linden van den

Heuvell

Categories: quant-ph

\\

We have observed Stueckelberg oscillations in the dipole-dipole interaction

between Rydberg atoms with an externally applied radio-frequency field. This

proves coherent interaction during at least 0.6 $\mu$s. The oscillating RF

field brings the interaction between cold Rydberg atoms in two separated

volumes in resonance and we observe multi-photon transitions when varying the

amplitude of the RF-field and the static field offset. The angular momentum

states we use show a quadratic Stark shift, which leads to an essentially

different behavior than linearly shifting states. Both cases are studied

theoretically using the Floquet approach and are compared. The amplitude of the

sidebands, related to the interaction strength, is given by the Bessel function

in the linearly shifting case and by the generalized Bessel function in the

quadratically shifting case. Both functions are further studied in the

classical limit. The oscillatory behavior of both functions correspond to

Stueckelberg oscillations, an interference effect described by the

semi-classical Landau-Zener-Stueckelberg model.

\\ ( http://arxiv.org/abs/0907.4275 , 2068kb)

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arXiv:0907.4410

Date: Sat, 25 Jul 2009 08:40:26 GMT (88kb)

Title: Exact solutions of a one-dimensional mixture of spinor bosons and spinor

fermions

Authors: Shi-Jian Gu, Junpeng Cao, Shu Chen, and Hai-Qing Lin

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

Comments: 25 pages, 10 figres

\\

The exact solutions of a one-dimensional mixture of spinor bosons and spinor

fermions with $\delta$-function interactions are studied. Some new sets of

Bethe ansatz equations are obtained by using the graded nest quantum inverse

scattering method. Many interesting features appear in the system. For example,

the wave function has the $SU(2|2)$ supersymmetry. It is also found that the

ground state of the system is partial polarized, where the fermions form a spin

singlet state and the bosons are totally polarized. From the solution of Bethe

ansatz equations, it is shown that all the momentum, spin and isospin

rapidities at the ground state are real if the interactions between the

particles are repulsive; while the fermions form two-particle bounded states

and the bosons form one large bound state, which means the bosons condensed at

the zero momentum point, if the interactions are attractive. The charge, spin

and isospin excitations are discussed in detail. The thermodynamic Bethe ansatz

equations are also derived and their solutions at some special cases are

obtained analytically.

\\ ( http://arxiv.org/abs/0907.4410 , 88kb)

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arXiv:0907.4444

Date: Sat, 25 Jul 2009 19:53:26 GMT (50kb)

Title: Spin-Exchange in Hydrogen-Antihydrogen Collisions

Authors: A.Yu. Voronin and P.Froelich

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

Comments: 16 pages, 4 figures

\\

We consider the spin-exchange in ultracold collisions of hydrogen ($H$) and

antihydrogen ($\bar{H}$) atoms. The cross sections for transitions between

various hyperfine states are calculated. We show that the process of spin

exchange in $\bar{H}-H$ collisions is basically driven by the strong force

between proton and antiproton, that spin-exchange cross-sections are

proportional to the difference of singlet and triplet strong force S-wave

scattering lengths, while the strong force effects are enhanced about $10^9$

times due to long range atomic forces. We show that any difference in hyperfine

structure of $H$ and $\bar{H}$ (CPT violation) manifests itself in radical

change of spin-exchange cross-sections energy behavior.

\\ ( http://arxiv.org/abs/0907.4444 , 50kb)

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arXiv:0907.4510

Date: Sun, 26 Jul 2009 19:49:30 GMT (273kb)

Title: Observation of an Efimov resonance in an ultracold mixture of atoms and

weakly bound dimers

Authors: S. Knoop, F. Ferlaino, M. Berninger, M. Mark, H.-C. N\"agerl, R. Grimm

Categories: cond-mat.quant-gas

Comments: Conference Proceeding ICPEAC 2009 Kalamazoo, to appear in Journal of

Physics: Conference Series

\\

We discuss our recent observation of an atom-dimer Efimov resonance in an

ultracold mixture of Cs atoms and Cs_2 Feshbach molecules [Nature Phys. 5, 227

(2009)]. We review our experimental procedure and present additional data

involving a non-universal g-wave dimer state, to contrast our previous results

on the universal s-wave dimer. We resolve a seeming discrepancy when

quantitatively comparing our experimental findings with theoretical results

from effective field theory.

\\ ( http://arxiv.org/abs/0907.4510 , 273kb)

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arXiv:0907.4595

Date: Mon, 27 Jul 2009 10:39:59 GMT (947kb)

Title: Single-particle properties and pseudogap effects in the BCS-BEC

crossover regime of an ultracold Fermi gas above Tc

Authors: Shunji Tsuchiya, Ryota Watanabe, and Yoji Ohashi

Categories: cond-mat.quant-gas

Comments: 23 pages, 11 figures

\\

We investigate strong-coupling effects on normal state properties of an

ultracold Fermi gas. Within the framework of $T$-matrix approximation in terms

of pairing fluctuations, we calculate the single-particle density of states

(DOS), as well as the spectral weight, over the entire BCS-BEC crossover region

above the superfluid phase transition temperature $T_{\rm c}$. Starting from

the weak-coupling BCS regime, we show that the so-called pseudogap develops in

DOS above $T_{\rm c}$, which becomes remarkable in the crossover region. The

pseudogap structure continuously changes into a fully gapped one in the

strong-coupling BEC regime, where the gap energy is directly related to the

binding energy of tightly bound molecules. We determine the pseudogap

temperature $T^*$ where the dip structure in DOS vanishes. The value of $T^*$

is shown to be very different from another characteristic temperature $T^{**}$

where a BCS-type double peak structure disappears in the spectral weight. While

one finds $T^*>T^{**}$ in the BCS regime, $T^{**}$ becomes higher than $T^*$ in

the crossover region and BEC regime. Including this, we determine the pseudogap

region in the phase diagram of ultracold Fermi gases. Our results would be

useful in the search for the pseudogap region in ultracold $^6$Li and $^{40}$K

Fermi gases.

\\ ( http://arxiv.org/abs/0907.4595 , 947kb)

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arXiv:0907.4608

Date: Mon, 27 Jul 2009 12:07:08 GMT (47kb)

Title: Single-particle density matrix for a time-dependent strongly interacting

one-dimensional Bose gas

Authors: R. Pezer, T. Gasenzer, H. Buljan

Categories: cond-mat.quant-gas

\\

We derive a $1/c$-expansion for the single-particle density matrix of a

strongly interacting time-dependent one-dimensional Bose gas, described by the

Lieb-Liniger model ($c$ denotes the strength of the interaction). The formalism

is derived by expanding Gaudin's Fermi-Bose mapping operator up to $1/c$-terms.

We derive an efficient numerical algorithm for calculating the density matrix

for time-dependent states in the strong coupling limit, which evolve from a

family of initial conditions in the absence of an external potential. We have

applied the formalism to study contraction dynamics of a localized wave packet

upon which a parabolic phase is imprinted initially.

\\ ( http://arxiv.org/abs/0907.4608 , 47kb)

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arXiv:0907.4612

Date: Mon, 27 Jul 2009 12:20:40 GMT (33kb)

Title: Bose-Fermi mixtures of self-assembled filaments of fermionic polar

molecules

Authors: M. Klawunn, J. Duhme, and L. Santos

Categories: cond-mat.quant-gas

Comments: 4 pages, 4 figures

\\

Fermionic polar molecules in deep 1D optical lattices may form self-assembled

filaments when the electric dipoles are oriented along the lattice axis. These

composites are bosons or fermions depending on the number of molecules per

chain, leading to a peculiar and complex Bose-Fermi mixture, which we discuss

in detail for the simplest case of a three-well potential. We show that the

interplay between filament binding energy, transverse filament modes, and

trimer Fermi energy leads to a rich variety of possible scenarios ranging from

a degenerate Fermi gas of trimers to a binary mixture of two different types of

bosonic dimers. We study the intriguing zero temperature and finite temperature

physics of these composites for the particular case of an ideal filament gas

loaded in 1D sites, and discuss possible methods to probe these chain mixtures.

\\ ( http://arxiv.org/abs/0907.4612 , 33kb)

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arXiv:0907.4739

Date: Mon, 27 Jul 2009 19:26:57 GMT (16kb)

Title: Phase Diagrams of Spinor Bose Gases

Authors: Kun Yang

Categories: cond-mat.quant-gas

Comments: 4 pages

\\

Using effective field theories dictated by the symmetry of the system, as

well as microscopic considerations, we map out the magnetic

coupling-temperature phase diagrams of spin-1 Bose gases in both two- and

three-dimensions. We also determine the nature of all phase boundaries, and

critical properties in the case of 2nd order phase transitions at both zero and

finite temperatures.

\\ ( http://arxiv.org/abs/0907.4739 , 16kb)

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arXiv:0907.4580

Date: Mon, 27 Jul 2009 09:31:08 GMT (107kb)

Title: Ground state properties of a one-dimensional strongly-interacting

Bose-Fermi mixture in a double-well potential

Authors: K. Lelas, D. Juki\'c, H. Buljan

Categories: cond-mat.quant-gas

Comments: 10 figures

\\

We calculate the reduced single-particle density matrix (RSPDM), momentum

distributions, natural orbitals and their occupancies, for a strongly

interacting one-dimensional Bose-Fermi mixture in a double-well potential with

a large central barrier. For mesoscopic systems, we find that the ground state

properties qualitatively differ for mixtures with even number of particles

(both odd-odd and even-even mixtures) in comparison to mixtures with odd

particle numbers (odd-even and even-odd mixtures). For even mixtures the

momentum distribution is smooth, whereas the momentum distribution of odd

mixtures possesses distinct modulations; the differences are observed also in

the off-diagonal correlations of the RSPDM, and in the occupancies of natural

orbitals. The calculation is based on a derived formula which enables efficient

calculation of the RSPDM for mesoscopic mixtures in various potentials.

\\ ( http://arxiv.org/abs/0907.4580 , 107kb)

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arXiv:0907.4430

Date: Mon, 27 Jul 2009 14:41:04 GMT (95kb)

Title: Exact ground state Monte Carlo method for Bosons without importance

sampling

Authors: M. Rossi, M. Nava, L. Reatto and D.E. Galli

Categories: cond-mat.other

Comments: 10 pages, 9 figures

\\

All "exact" Quantum Monte Carlo methods for the ground state of Boson systems

developed so far make use of importance sampling based either on a guiding

function or on an initial variational wave function. Here we investigate the

need of importance sampling in the case of Path Integral Ground State (PIGS)

Monte Carlo. PIGS is based on a discrete imaginary time evolution of an initial

wave function with a non zero overlap with the ground state, that gives rise to

a discrete path which is sampled via a Metropolis like algorithm. In principle

the exact ground state is reached in the limit of an infinite imaginary time

evolution, but actual computations are based on finite time evolutions and the

question is whether such computations give unbiased exact results. We have

studied bulk liquid and solid 4He with PIGS by considering as initial wave

function a constant, i.e. the ground state of an ideal Bose gas. This implies

that the evolution toward the ground state is driven only by the imaginary time

propagator, i.e. there is no importance sampling. For both the phases we obtain

results converging to those obtained by considering the best available

variational wave function (the Shadow wave function) as initial wave function.

Moreover we obtain the same results even by considering wave functions with the

wrong correlations, for instance a wave function of a strongly localized

Einstein crystal for the liquid phase. This convergence is true not only for

diagonal properties such as the energy, the radial distribution function and

the static structure factor, but also for off--diagonal ones, such as the

one--body density matrix. From this analysis we conclude that zero temperature

PIGS calculations can be as unbiased as those of finite temperature Path

Integral Monte Carlo.

\\ ( http://arxiv.org/abs/0907.4430 , 95kb)

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arXiv:0907.4779

Date: Mon, 27 Jul 2009 21:44:34 GMT (316kb)

Title: Matter-wave bistability in coupled atom-molecule quantum gases

Authors: Lei Jiang, Han Pu, Andrew Robertson, Hong Y. Ling

Categories: cond-mat.quant-gas

Comments: 6 pages, 5 figures

\\

We study the matter-wave bistability in coupled atom-molecule quantum gases,

in which heteronuclear molecules are created via an interspecies Feshbach

resonance involving either two-species Bose or two-species Fermi atoms at zero

temperature. We show that the resonant two-channel Bose model is equivalent to

the nondegenerate parametric down-conversion in quantum optics, while the

corresponding Fermi model can be mapped to a quantum optics model that

describes a single-mode laser field interacting with an ensemble of

inhomogeneously broadened two-level atoms. Using these analogy and the fact

that both models are subject to the Kerr nonlinearity due to the two-body

s-wave collisions, we show that under proper conditions, the population in the

molecular state in both models can be made to change with the Feshbach detuning

in a bistable fashion.

\\ ( http://arxiv.org/abs/0907.4779 , 316kb).

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arXiv:0907.4683

Date: Mon, 27 Jul 2009 17:37:36 GMT (69kb)

Title: Magnetic field imaging with atomic Rb vapor

Authors: Eugeniy E. Mikhailov (1), I. Novikova (1), M. D. Havey (2), F. A.

Narducci (3) ((1) Department of Physics, The College of William & Mary, (2)

Department of Physics, Old Dominion University, (3) EO Sensors Division,

Naval Air Systems Command)

Categories: quant-ph

Comments: 4 pages, 3 figures

\\

We demonstrate the possibility of dynamic imaging of magnetic fields using

electromagnetically induced transparency in an atomic gas. As an experimental

demonstration we employ an atomic Rb gas confined in a glass cell to image the

transverse magnetic field created by a long straight wire. In this arrangement,

which clearly reveals the essential effect, the field of view is about 2 x 2

mm^2 and the field detection uncertainty is 0.14 mG per 10 um x 10 um image

pixel.

\\ ( http://arxiv.org/abs/0907.4683 , 69kb)

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\\

arXiv:0907.4734

Date: Mon, 27 Jul 2009 19:05:24 GMT (21kb)

Title: Faddeev equations in one-dimensional problems with resonant interactions

Authors: Vladimir A. Yurovsky

Categories: physics.atom-ph

\\

A problem of three one-dimensional bosons with resonant multichannel

interactions is considered. The problem is reduced to a single-channel

Faddeev-Lovelace equation by elimination of the closed and output channels. The

equation is regularized using algebraic properties of their singularities.

\\ ( http://arxiv.org/abs/0907.4734 , 21kb)

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\\

arXiv:0907.4537

Date: Mon, 27 Jul 2009 02:26:33 GMT (16kb)

Title: Translation-symmetry protected topological orders on lattice

Authors: Su-Peng Kou and Xiao-Gang Wen

Categories: cond-mat.str-el

\\

In this paper we systematically study a simple class of translation-symmetry

protected topological orders in quantum spin systems using slave-particle

approach. The spin systems on square lattice are translation invariant, but may

break any other symmetries. We consider topologically ordered ground states

that do not spontaneously break any symmetry. Those states can be described by

Z2A or Z2B projective symmetry group. We find that the Z2A translation

symmetric topological orders can still be divided into 16 sub-classes

corresponding to 16 new translation-symmetry protected topological orders. We

introduced four $Z_2$ topological indices $\zeta_{\v{k}}=0,1$ at $\v

{k}=(0,0)$, $(0,\pi)$, $(\pi, 0)$, $(\pi ,\pi)$ to characterize those 16 new

topological orders. We calculated the topological degeneracies and crystal

momenta for those 16 topological phases on even-by-even, even-by-odd,

odd-by-even, and odd-by-odd lattices, which allows us to physically measure

such topological orders. We predict the appearance of gapless fermionic

excitations at the quantum phase transitions between those symmetry protected

topological orders. Our result can be generalized to any dimensions. We find

256 translation-symmetry protected Z2A topological orders for a system on 3D

lattice.

\\ ( http://arxiv.org/abs/0907.4537 , 16kb)

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\\

arXiv:0907.4440

Date: Mon, 27 Jul 2009 12:56:28 GMT (717kb,D)

Title: Gap polariton solitons

Authors: A. V. Gorbach, B. A. Malomed, D. V. Skryabin

Categories: physics.optics nlin.PS

Comments: 11 pages, 7 figures, published in PLA

Journal-ref: Physics Letters A 373, 3024-3027 (2009)

\\

We report the existence, and study mobility and interactions of gap polariton

solitons in a microcavity with a periodic potential, where the light field is

strongly coupled to excitons. Gap solitons are formed due to the interplay

between the repulsive exciton-exciton interaction and cavity dispersion. The

analysis is carried out in an analytical form, using the coupled-mode (CM)

approximation, and also by means of numerical methods.

\\ ( http://arxiv.org/abs/0907.4440 , 717kb)

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\\

arXiv:0907.4546

Date: Mon, 27 Jul 2009 05:48:13 GMT (25kb)

Title: Creation of pure multi-mode entangled states in a ring cavity

Authors: Gao-xiang Li and Zbigniew Ficek

Categories: quant-ph

Comments: 8 pages, 1 figure, "Quo vadis Quantum Optics"- special issue of

Optics Communications memory of Krzysztof Wodkiewicz

\\

Practical schemes for creation of multi-mode squeezed (entangled) states of

atomic ensembles located inside a high-Q ring cavity are discussed. It is

assumed that the cavity is composed of two degenerate mutually

counter-propagating modes that can simultaneously couple to the atomic

ensembles with the same coupling strengths. The ensembles are composed of

ultra-cold atoms which are modeled as four-level systems driven by two laser

fields, both co-propagating with one of the cavity directions. We illustrate a

procedure that constructs multi-mode squeezed states from the vacuum by a

unitary transformation associated with the collective dynamics of the atomic

ensembles subjected to driving lasers of a suitably adjusted amplitudes and

phases. The laser prepare the collective modes in a desired squeezed state that

then decay to a steady-state with the rate determined by the cavity damping

rate.

\\ ( http://arxiv.org/abs/0907.4546 , 25kb)

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\\

arXiv:0907.4638

Date: Mon, 27 Jul 2009 10:24:40 GMT (238kb,D)

Title: $N$-Slit Interference: Fractals in Near-Field Region, Bohmian

Trajectories

Authors: Valeriy I. Sbitnev

Categories: quant-ph

Comments: 8 pages, 7 figures

\\

Scattering cold particles on an $N$-slit grating is shown to reproduce an

interference pattern, that manifests itself in the near-field region as the

fractal Talbot carpet. In the far-field region the pattern is transformed to an

ordinary diffraction, where principal beams are partitioned from each other by

($N-2$) weak ones. A probability density plot of the wave function, to be

represented by a gaussian wavepacket, is calculated both in the near-field

region and in the far-field one. Bohmian (geodesic) trajectories, to be

calculated by a guidance equation, are superimposed on the probability density

plot well enough. It means, that a particle, moving from a source to a

detector, passes across the grating along a single bohmian trajectory

through-passing one and only one slit.

Keywords: Gaussian wavepacket, near-field interference, far-field

diffraction, Talbot carpet, fractal, bohmian trajectory, guidance equation

\\ ( http://arxiv.org/abs/0907.4638 , 238kb)

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\\

arXiv:0907.4646

Date: Mon, 27 Jul 2009 14:59:30 GMT (31kb,D)

Title: Approximating strongly correlated spin and fermion wavefunctions with

correlator product states

Authors: Hitesh J. Changlani, Jesse M. Kinder, Cyrus J. Umrigar, and Garnet

Kin-Lic Chan

Categories: cond-mat.str-el

Comments: 5 pages, 1 figure, 2 tables, submitted to Phys. Rev. Lett

\\

We explore correlator product states for the approximation of correlated

wavefunctions in arbitrary dimensions. We show that they encompass many

interesting states including Laughlin's quantum Hall wavefunction, Huse and

Elser's frustrated spin states, and Kitaev's toric code. We further establish

their relation to common families of variational wavefunctions, such as matrix

and tensor product states and resonating valence bond states. Calculations on

the Heisenberg and spinless Hubbard models show that correlator product states

capture both two-dimensional correlations (independent of system width) as well

as non-trivial fermionic correlations (without sign problems). In

one-dimensional simulations, correlator product states appear competitive with

matrix product states with a comparable number of variational parameters,

suggesting they may eventually provide a route to practically generalise the

density matrix renormalisation group to higher dimensions.

\\ ( http://arxiv.org/abs/0907.4646 , 31kb)

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\\

arXiv:0907.4934

Date: Tue, 28 Jul 2009 15:25:01 GMT (54kb)

Title: Bose-Einstein condensation of polaritons in graphene in a high magnetic

field

Authors: Oleg L. Berman, Roman Ya. Kezerashvili, and Yurii E. Lozovik

Categories: cond-mat.mes-hall cond-mat.str-el

Comments: 7 pages, 1 figure

\\

The Bose-Einstein condensation (BEC) of magnetoexcitonic polaritons in a

graphene layer embedded in a optical microcavity in a high magnetic field $B$

is predicted. The essential property of this system (in contrast, e.g., to a

quantum well embedded in a cavity) is stronger influence of magnetic field and

weaker influence of disorder. A two-dimensional (2D) magnetoexcitonic

polaritons gas is considered in a planar harmonic electric field potential

applied to excitons or a parabolic shape of the optical cavity causing the

trapping of microcavity photons. It is shown that the effective polariton mass

$M_{\rm eff}$ increases with magnetic field as $B^{1/2}$. The BEC critical

temperature $T_{c}^{(0)}$ decreases as $B^{-1/4}$ and increases with the spring

constant of the parabolic trap. The Rabi splitting related to the creation of a

magnetoexciton in a high magnetic field in graphene is obtained.

\\ ( http://arxiv.org/abs/0907.4934 , 54kb)

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\\

arXiv:0907.4976

Date: Tue, 28 Jul 2009 19:41:36 GMT (66kb)

Title: The Casimir Effect from a Condensed Matter Perspective

Authors: L. Palova, P. Chandra and P. Coleman

Categories: cond-mat.other cond-mat.mes-hall

Comments: Accepted for Publication in American Journal of Physics

\\

The Casimir effect, a key observable realization of vacuum fluctuations, is

usually taught in graduate courses on quantum field theory. The growing

importance of Casimir forces in microelectromechanical systems motivates this

subject as a topic for graduate many-body physics courses. To this end, we

revisit the Casimir effect using methods common in condensed matter physics. We

recover previously derived results and explore the implications of the

analogies implicit in this treatment.

\\ ( http://arxiv.org/abs/0907.4976 , 66kb)

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\\

arXiv:0907.5061

Date: Wed, 29 Jul 2009 08:07:29 GMT (448kb)

Title: Derivation of non-Markoffian transport equations for trapped cold atoms

in nonequilibrium thermal field theory

Authors: Y.Nakamura, T.Sunaga, M.Mine, M.Okumura, Y.Yamanaka

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

Comments: 12 pages, 2 figures

\\

The non-Markoffian transport equations for the systems of cold Bose atoms

confined by a external potential both without and with a Bose-Einstein

condensate are derived in the framework of nonequilibrium thermal filed theory

(Thermo Field Dynamics). Our key elements are an explicit particle

representation and a self-consistent renormalization condition which are

essential in thermal field theory. The non-Markoffian transport equation for

the non-condensed system, derived at the two-loop level, is reduced in the

Markoffian limit to the ordinary quantum Boltzmann equation derived in the

other methods. For the condensed system, we derive a new transport equation

with an additional collision term which becomes important in the Landau

instability.

\\ ( http://arxiv.org/abs/0907.5061 , 448kb)

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\\

arXiv:0907.5129 (*cross-listing*)

Date: Wed, 29 Jul 2009 13:53:27 GMT (21kb)

Title: Quantum measures for density correlations in optical lattices

Authors: F. Benatti, R. Floreanini and G.G. Guerreschi

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

Comments: LaTeX, 14 pages

\\

The density-density correlation profiles obtained superimposing absorption

images from atomic clouds freely expanding after the release of the confining

optical lattice can be theoretically described in terms of a generalized

quantum measure based on coherent-like states. We show that the corresponding

density patterns differ in a testable way from those computed using standard

many-body mean values, usually adopted in fitting experimental data.

\\ ( http://arxiv.org/abs/0907.5129 , 21kb)

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\\

arXiv:0907.5206

Date: Wed, 29 Jul 2009 20:18:17 GMT (2340kb)

Title: Photonic quantum transport in a nonlinear optical fiber

Authors: Mohammad Hafezi, Darrick E. Chang, Vladimir Gritsev, Eugene Demler,

Mikhail D. Lukin

Categories: quant-ph

Comments: 5 pages, 4 figures

\\

We theoretically study the transmission of few-photon quantum fields through

a strongly nonlinear optical medium. We develop a general approach to

investigate non-equilibrium quantum transport of bosonic fields through a

finite-size nonlinear medium and apply it to a recently demonstrated

experimental system where cold atoms are loaded in a hollow-core optical fiber.

We show that when the interaction between photons is effectively repulsive, the

system acts as a single-photon switch. In the case of attractive interaction,

the system can exhibit either anti-bunching or bunching, associated with the

resonant excitation of bound states of photons by the input field. These

effects can be observed by probing statistics of photons transmitted through

the nonlinear fiber.

\\ ( http://arxiv.org/abs/0907.5206 , 2340kb)

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\\

arXiv:0907.5405

Date: Thu, 30 Jul 2009 19:48:06 GMT (489kb)

Title: Simulations of the Dipole-Dipole Interaction between Two Spatially

Separated Groups of Rydberg Atoms

Authors: T. J. Carroll (1), C. Daniel (1), L. Hoover (1), T. Sidie (1), and M.

W. Noel (2) ((1) Ursinus College, (2) Bryn Mawr College)

Categories: physics.atom-ph

Comments: 9 pages, 11 figures

\\

The dipole-dipole interaction among ultra-cold Rydberg atoms is simulated. We

examine a general interaction scheme in which two atoms excited to the x and x'

states are converted to y and y' states via a Forster resonance. The atoms are

arranged in two spatially separated groups, each consisting of only one species

of atom. We record the fraction of atoms excited to the y' state as the

distance between the two groups is varied. With zero detuning a many-body

effect that relies on always resonant interactions causes the interaction to

have a finite range. When the detuning is greater than zero, another many-body

effect causes a peak in the interaction when the two groups of atoms are some

distance away from each other. To obtain these results it is necessary to

include multiple atoms and solve the full many-body wave function. These

simulation results are supported by recent experimental evidence. These

many-body effects, combined with appropriate spatial arrangement of the atoms,

could be useful in controlling the energy exchange among the atoms.

\\ ( http://arxiv.org/abs/0907.5405 , 489kb)

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\\

arXiv:0907.5341

Date: Thu, 30 Jul 2009 13:34:11 GMT (39kb)

Title: Spectrum of bound fermion states on vortices in $^3$He-B

Authors: M.A. Silaev

Categories: cond-mat.other

Comments: 6 pages, 1 figure

\\

We study subgap spectra of fermions localized within vortex cores in

$^3$He-B. We develop an analytical treatment of the low-energy states and

consider the characteristic properties of fermion spectra for different types

of vortices. Due to the removed spin degeneracy the spectra of all singly

quantized vortices consist of two different anomalous branches crossing the

Fermi level. For singular $o$ and $u$ vortices the anomalous branches are

similar to the standard Caroli-de Gennes -Matricon ones and intersect the Fermi

level at zero angular momentum yet with different slopes corresponding to

different spin states. On the contrary the spectral branches of nonsingular

vortices intersect the Fermi level at finite angular momenta which leads to the

appearance of a large number of zero modes, i.e. energy states at the Fermi

level. Considering the $v$, $w$ and $uvw$ vortices with superfluid cores we

show that the number of zero modes is proportional to the size of the vortex

core.

\\ ( http://arxiv.org/abs/0907.5341 , 39kb)

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\\

arXiv:0907.5349

Date: Thu, 30 Jul 2009 13:56:48 GMT (118kb)

Title: Thomas-Fermi Approximation for a Condensate with Higher-order

Interactions

Authors: M. Th{\o}gersen, N. T. Zinner, A. S. Jensen

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

Comments: 7+ pages, RevTex4 format, 5 figures

\\

We consider the ground-state of a harmonically trapped Bose-Einstein

condensate within the Gross-Pitaevskii theory including the effective range

corrections for a two-body zero-range potential. The resulting non-linear

Schr{\"o}dinger equation is solved analytically in the Thomas-Fermi

approximation neglecting the kinetic energy term. We present results for the

chemical potential and the condensate profiles, discuss boundary conditions,

and compare to the usual Thomas-Fermi approach. Our findings indicate that

kinetic energy terms are intrinsically important when including higher-order

corrections, both for theoretical consistence and in concrete physical systems.

\\ ( http://arxiv.org/abs/0907.5349 , 118kb)

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\\

arXiv:0907.5389

Date: Thu, 30 Jul 2009 18:28:29 GMT (17kb)

Title: Fermion zero modes at the boundary of superfluid 3He-B

Authors: G.E. Volovik

Categories: cond-mat.other cond-mat.str-el

Comments: 3 pages, no Figures, JETP Letters style

\\

Superfluid 3He-B belongs to the important special class of time-reversal

invariant topological superfluids. It has Majorana fermions as edge states on

the surface of bulk 3He-B. On the rough wall these fermion zero modes have

finite density of states at E=0.

\\ ( http://arxiv.org/abs/0907.5389 , 17kb)

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\\

arXiv:0907.5404

Date: Thu, 30 Jul 2009 19:47:15 GMT (82kb,D)

Title: Natural mode entanglement as a resource for quantum communication

Authors: Libby Heaney and Vlatko Vedral

Categories: quant-ph

Comments: 4 pages, 1 figure, comments welcome

\\

Natural particle-number entanglement resides between spatial modes in

coherent ultra-cold atomic gases. However, operations on the modes are

restricted by a superselection rule that forbids coherent superpositions of

different particle numbers. This seemingly prevents mode entanglement being

used as a resource for quantum communication. In this paper, we demonstrate

that mode entanglement of a single massive particle can be used for dense

coding and quantum teleportation despite the superselection rule. In

particular, we provide schemes where the dense coding linear photonic channel

capacity is reached without a shared reservoir and where the full quantum

channel capacity is achieved if both parties share a coherent particle

reservoir.

\\ ( http://arxiv.org/abs/0907.5404 , 82kb)

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\\

arXiv:0907.5161

Date: Wed, 29 Jul 2009 15:37:58 GMT (1719kb)

Title: Interference of Cooper Pairs Emitted from Independent Superconductors

Authors: Mauro Iazzi, Kazuya Yuasa

Categories: cond-mat.supr-con

Comments: 4 pages, 3 figures

\\

We discuss the interference in the two-particle distribution of the electrons

emitted from two independent superconducting tips. The two-particle correlation

exhibits interesting oscillating patterns due to Andreev processes, from which

one can measure the relative phase of the two superconductors. The phases are

fixed as a result of the spontaneous symmetry breaking, and the interference

patterns appear with a definite fringe spacing but with different offsets for

different realizations of the superconducting states. It is clarified that this

is nothing but the first-order interference of Cooper pairs emitted from

different but coherent sources and is the equivalent of the interference of two

independent Bose-Einstein condensates.

\\ ( http://arxiv.org/abs/0907.5161 , 1719kb)

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The replacements:

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\\

arXiv:0902.2229

replaced with revised version Thu, 23 Jul 2009 01:43:01 GMT (125kb,D)

Title: Measurement of inelastic losses in a sample of ultracold Rb-85

Authors: P. A. Altin, N. P. Robins, R. Poldy, J. E. Debs, D. D\"oring, C. Figl

and J. D. Close

Categories: physics.atom-ph

Comments: 4 pages, 3 figures, content changed

\\ ( http://arxiv.org/abs/0902.2229 , 125kb)

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\\

arXiv:0905.1125

replaced with revised version Fri, 24 Jul 2009 19:04:21 GMT (1329kb)

Title: Supersolidity of Cold Atomic Bose-Fermi mixtures in optical lattices

Authors: Peter P. Orth, Doron L. Bergman, and Karyn Le Hur

Categories: cond-mat.quant-gas

Comments: Moved technical details to appendices. Enlarged list of references

\\ ( http://arxiv.org/abs/0905.1125 , 1329kb)

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\\

arXiv:0907.3727

replaced with revised version Thu, 23 Jul 2009 18:52:05 GMT (124kb,D)

Title: Hyperfine-interaction- and magnetic-field-induced

Bose-Einstein-statistics suppressed two-photon transitions

Authors: M. G. Kozlov, D. English, D. Budker

Categories: physics.atom-ph

\\ ( http://arxiv.org/abs/0907.3727 , 124kb)

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\\

arXiv:0907.0218

replaced with revised version Fri, 24 Jul 2009 17:47:33 GMT (113kb)

Title: Polaron formation as a genuine nonequilibrium phenomenon

Authors: S. Ajisaka, S. Tasaki, and I. Terasaki

Categories: cond-mat.stat-mech

Comments: 4 pages, 6 figures

\\ ( http://arxiv.org/abs/0907.0218 , 113kb)

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\\

arXiv:0902.1659

replaced with revised version Fri, 24 Jul 2009 11:13:24 GMT (517kb)

Title: Observation of a Non-local Optical Vortex

Authors: R. M. Gomes, A. Salles, F. Toscano, P. H. Souto Ribeiro and S. P.

Walborn

Categories: quant-ph

Comments: 4 pages, 4 figures

Journal-ref: Phys. Rev. Lett. 103, 033602 (2009)

\\ ( http://arxiv.org/abs/0902.1659 , 517kb)

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\\

arXiv:0903.4093

replaced with revised version Sun, 26 Jul 2009 09:29:58 GMT (30kb)

Title: Spin chain description of rotating bosons at $\nu=1$

Authors: Emma Wikberg, Emil J. Bergholtz and Anders Karlhede

Categories: cond-mat.mes-hall cond-mat.str-el

Comments: Published. 19 pages, 4 figures

Journal-ref: J. Stat. Mech. (2009) P07038

DOI: 10.1088/1742-5468/2009/07/P07038

\\ ( http://arxiv.org/abs/0903.4093 , 30kb)

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\\

arXiv:0907.1284

replaced with revised version Sun, 26 Jul 2009 19:00:41 GMT (111kb)

Title: Inhomogeneous spectral moment sum rules for the retarded Green function

and self-energy of strongly correlated electrons or ultracold fermionic atoms

in optical lattices

Authors: J. K. Freericks (Georgetown University) and V. Turkowski (University

of Central Florida)

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

Comments: (28 pages, 6 figures, ReVTeX) Paper updated to correct equations 11,

24, and 28

\\ ( http://arxiv.org/abs/0907.1284 , 111kb)

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\\

arXiv:0811.4350

replaced with revised version Sun, 26 Jul 2009 01:58:27 GMT (1449kb,D)

Title: Magnetic field sensing beyond the standard quantum limit using 10-spin

NOON states

Authors: Jonathan A. Jones, Steven D. Karlen, Joe Fitzsimons, Arzhang Ardavan,

Simon C. Benjamin, G. A. D. Briggs and John J. L. Morton

Categories: quant-ph

Comments: 5 pages, 3 figures

Journal-ref: Science 324, 1166-1168 (2009)

DOI: 10.1126/science.1170730

\\ ( http://arxiv.org/abs/0811.4350 , 1449kb)

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\\

arXiv:0903.1954

replaced with revised version Mon, 27 Jul 2009 18:51:13 GMT (2399kb)

Title: Dynamics of formation and decay of coherence in a polariton condensate

Authors: E. del Valle, D. Sanvitto, A. Amo, F.P. Laussy, A. Andre, C. Tejedor

and L. Vina

Categories: cond-mat.mes-hall

\\ ( http://arxiv.org/abs/0903.1954 , 2399kb)

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\\

arXiv:0907.3813

replaced with revised version Mon, 27 Jul 2009 16:51:11 GMT (443kb)

Title: Quantum Control of Interacting Bosons in Periodic Optical Lattice

Authors: Analabha Roy, Linda E. Reichl

Categories: physics.atom-ph

Comments: Sent to Physical Review A Corrected spelling mistake in name

\\ ( http://arxiv.org/abs/0907.3813 , 443kb)

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\\

arXiv:0904.1975 (*cross-listing*)

replaced with revised version Mon, 27 Jul 2009 17:32:17 GMT (619kb,D)

Title: Lectures on Holographic Superfluidity and Superconductivity

Authors: Christopher P. Herzog

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

Comments: 39 pages, 9 figures, lectures given at the Trieste Spring School on

Superstring Theory and Related Topics; v2 small corrections, to appear in J.

Phys. A

\\ ( http://arxiv.org/abs/0904.1975 , 619kb)

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\\

arXiv:0904.2614 (*cross-listing*)

replaced with revised version Mon, 27 Jul 2009 10:28:10 GMT (190kb)

Title: Control of spin correlations by periodic driving

Authors: K. Kudo, T. Boness and T.S. Monteiro

Categories: quant-ph cond-mat.other

Comments: 5 pages, 3 figures

\\ ( http://arxiv.org/abs/0904.2614 , 190kb)

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\\

arXiv:0907.4328

replaced with revised version Mon, 27 Jul 2009 12:06:08 GMT (140kb)

Title: Emergence of Levy statistics in many-particle quantum systems

Authors: A. V. Ponomarev, S. Denisov, P. Hanggi

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

Comments: 4 pages, 4 figures

\\ ( http://arxiv.org/abs/0907.4328 , 140kb)

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\\

arXiv:0904.3911

replaced with revised version Mon, 27 Jul 2009 14:38:40 GMT (265kb)

Title: Quantum linear Boltzmann equation

Authors: Bassano Vacchini, Klaus Hornberger

Categories: quant-ph math-ph math.MP

Comments: 63 pages, 6 figures; v3:corresponds to published version

Journal-ref: Physics Reports 478 (2009) 71-120

DOI: 10.1016/j.physrep.2009.06.001

\\ ( http://arxiv.org/abs/0904.3911 , 265kb)

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\\

arXiv:0907.3689 (*cross-listing*)

replaced with revised version Tue, 28 Jul 2009 13:44:09 GMT (174kb,D)

Title: Contraction of fermionic operator circuits and the simulation of

strongly correlated fermions

Authors: Thomas Barthel and Carlos Pineda and Jens Eisert

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

Comments: 12 pages, 9 pdf figures; minor changes, one figure added, references

added

\\ ( http://arxiv.org/abs/0907.3689 , 174kb)

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\\

arXiv:0809.5141

replaced with revised version Tue, 28 Jul 2009 14:55:22 GMT (1298kb)

Title: Magnetism, coherent many-particle dynamics, and relaxation with

ultracold bosons in optical superlattices

Authors: Thomas Barthel, Christian Kasztelan, Ian P. McCulloch, Ulrich

Schollw\"ock

Categories: cond-mat.stat-mech

Comments: 20 pages, 24 figures; minor changes, published version

Journal-ref: Phys. Rev. A 79, 053627 (2009)

DOI: 10.1103/PhysRevA.79.053627

\\ ( http://arxiv.org/abs/0809.5141 , 1298kb)

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\\

arXiv:0901.2342

replaced with revised version Tue, 28 Jul 2009 15:27:06 GMT (226kb)

Title: Spectral functions in one-dimensional quantum systems at T>0

Authors: Thomas Barthel, Ulrich Schollw\"ock and Steven R. White

Categories: cond-mat.str-el

Comments: 6 pages, 8 figures; added comparison to quantum Monte Carlo, extended

discussion of the method, 4 figures added; published version

Journal-ref: Phys. Rev. B 79, 245101 (2009)

DOI: 10.1103/PhysRevB.79.245101

\\ ( http://arxiv.org/abs/0901.2342 , 226kb)

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\\

arXiv:0902.3967

replaced with revised version Tue, 28 Jul 2009 07:34:21 GMT (42kb)

Title: Josephson oscillations between exciton condensates in electrostatic

traps

Authors: Massimo Rontani, L. J. Sham

Categories: cond-mat.mes-hall

Comments: RevTeX 4.0. 6 pages, 3 figures. We added new material (Fig. 3) and

references. To appear in Physical Review B

\\ ( http://arxiv.org/abs/0902.3967 , 42kb)

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\\

arXiv:0905.1708

replaced with revised version Tue, 28 Jul 2009 18:33:02 GMT (108kb)

Title: Mesoscopic quantum switching of a Bose-Einstein condensate in an optical

lattice governed by the parity of the number of atoms

Authors: V. S. Shchesnovich

Categories: cond-mat.quant-gas

Comments: Added the discussion of stability of the parity effect under small

perturbations and the inhomogeneity of the lattice; 4 pages, 3 figures in

color

\\ ( http://arxiv.org/abs/0905.1708 , 108kb)

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\\

arXiv:0907.4250

replaced with revised version Tue, 28 Jul 2009 08:22:52 GMT (1482kb)

Title: Experimental Results Related to Discrete Nonlinear Schr\"odinger

Equations

Authors: Mason A. Porter

Categories: cond-mat.quant-gas cond-mat.other nlin.PS physics.atom-ph

physics.optics

Comments: 17 pages, review article; (document is same as before, but I forgot

to include the reference to the published version in Journal-ref); in P. G.

Kevrekidis, Discrete Nonlinear Schr\"odinger Equation: Mathematical Analysis,

Numerical Computations, and Physics Perspectives, 175-189, Springer Tracts in

Modern Physics (Springer-Verlag)

\\ ( http://arxiv.org/abs/0907.4250 , 1482kb)

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\\

arXiv:0902.0172

replaced with revised version Tue, 28 Jul 2009 21:24:07 GMT (145kb)

Title: Effects of a dilute gas of fermions on the superfluid-insulator phase

diagram of the Bose-Hubbard model

Authors: Sumanta Tewari, Roman M. Lutchyn, S. Das Sarma

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

Comments: 16 pages, 5 eps figures; final version to appear in PRB

\\ ( http://arxiv.org/abs/0902.0172 , 145kb)

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\\

arXiv:0902.4119

replaced with revised version Tue, 28 Jul 2009 08:45:27 GMT (35kb)

Title: Multiple condensed phases in attractively interacting Bose systems

Authors: M. M\"annel, K. Morawetz, P. Lipavsk\'y

Categories: cond-mat.stat-mech nucl-th

\\ ( http://arxiv.org/abs/0902.4119 , 35kb)

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\\

arXiv:0901.1106 (*cross-listing*)

replaced with revised version Wed, 29 Jul 2009 21:05:54 GMT (9kb)

Title: Bose-Einstein Condensation of Dark Matter Axions

Authors: P. Sikivie and Q. Yang

Categories: hep-ph astro-ph.CO cond-mat.stat-mech

Comments: 4 pages. The paper has been substantially rewritten. The conclusions

are unchanged

Report-no: UFIFT-HEP-09-1

\\ ( http://arxiv.org/abs/0901.1106 , 9kb)

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arXiv:0810.1796

replaced with revised version Thu, 30 Jul 2009 00:47:20 GMT (113kb)

Title: The Non-universal behaviour of Cold Fermi Condensates with Narrow

Feshbach Resonances

Authors: Chi-Yong Lin, Da-Shin Lee, and Ray J. Rivers

Categories: cond-mat.supr-con

Comments: 7 pages, there is no differences in results between this (v2) and the

older version (v1), but v2 makes the nature of the non-canonical behavior of

the EOS clearer

\\ ( http://arxiv.org/abs/0810.1796 , 113kb)

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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 Sep 24 2009 - 15:47:36 EST

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