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

Date: Wed, 27 Oct 2010 23:00:33 +1000

Date: Wed, 27 Oct 2010 23:00:33 +1000

Dear subscribers,

This week's selection was compiled by Chao Feng, and contains 27 new

abstracts and 20 replacements.

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arXiv:1008.4603 (*cross-listing*)

Date: Thu, 26 Aug 2010 21:21:27 GMT (705kb)

Title: Local and spatially extended sub-Poisson atom number fluctuations in

optical lattices

Authors: C. Gross, J. Esteve, M. K. Oberthaler, A. D. Martin, J. Ruostekoski

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

\\

We demonstrate that ultracold interacting bosonic atoms in an optical lattice

show sub-Poissonian on-site and inter-site atom number fluctuations. The

experimental observations agree with numerical predictions of the truncated

Wigner approximation. The correlations persist in the presence of multi-mode

atom dynamics and even over large spatially extended samples involving several

sites and large populations.

\\ ( http://arxiv.org/abs/1008.4603 , 705kb)

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arXiv:1008.4664

Date: Fri, 27 Aug 2010 08:53:48 GMT (1199kb)

Title: Binary quantum turbulence arising from counter-superflow instability in

two-component Bose-Einstein condensates

Authors: Hiromitsu Takeuchi, Shungo Ishino, and Makoto Tsubota

Categories: cond-mat.quant-gas cond-mat.other physics.flu-dyn

Comments: 5 pages, 3 figures

\\

We theoretically study the development of quantum turbulence from two

counter-propagating superfluids of miscible Bose-Einstein condensates by

numerically solving the coupled Gross-Pitaevskii equations. When the relative

velocity exceeds a critical value, the counter-superflow becomes unstable and

quantized vortices are nucleated, which leads to isotropic quantum turbulence

consisting of two superflows. It is shown that the binary turbulence can be

realized experimentally in a trapped system.

\\ ( http://arxiv.org/abs/1008.4664 , 1199kb)

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arXiv:1008.4682

Date: Fri, 27 Aug 2010 09:54:57 GMT (9kb)

Title: Fluctuation indices for atomic systems with Bose-Einstein condensate

Authors: V.I. Yukalov

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

Comments: Latex file, 12 pages

Journal-ref: Laser Phys. Lett. 7 (2010) 831-836

\\

The notion of fluctuation indices, characterizing thermodynamic stability of

statistical systems, is advanced. These indices are especially useful for

investigating the stability of nonuniform and trapped atomic assemblies. The

fluctuation indices are calculated for several systems with Bose-Einstein

condensate. It is shown that: the ideal uniform Bose-condensed gas is

thermodynamically unstable; trapped ideal gases are stable for the confining

dimension larger than two; trapped gases, under the confining dimension two,

are weakly unstable; harmonically trapped gas is stable only for the spatial

dimension three; one-dimensional harmonically trapped gas is unstable;

two-dimensional gas in a harmonic trap represents a marginal case, being weakly

unstable; interacting nonuniform three-dimensional Bose-condensed gas is

stable. There are no thermodynamically anomalous particle fluctuations in

stable Bose-condensed systems.

\\ ( http://arxiv.org/abs/1008.4682 , 9kb)

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arXiv:1008.4684

Date: Fri, 27 Aug 2010 10:02:14 GMT (1045kb,D)

Title: Flat bands, Dirac cones and atom dynamics in an optical lattice

Authors: V. Apaja, M. Hyrk\"as and M. Manninen

Categories: cond-mat.str-el

Comments: 4 pages, 3 figures

\\

We study atoms trapped with a harmonic confinement in an optical lattice

characterized by a flat band and Dirac cones. We show that such an optical

lattice can be constructed which can be accurately described with the tight

binding or Hubbard models. In the case of fermions the release of the harmonic

confinement removes fast atoms occupying the Dirac cones while those occupying

the flat band remain immobile. Using exact diagonalization and dynamics we

demonstrate that a similar strong occupation of the flat band does not happen

in bosonic case and furthermore that the mean field model is not capable for

describing the dynamics of the boson cloud.

\\ ( http://arxiv.org/abs/1008.4684 , 1045kb)

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arXiv:1008.4732

Date: Fri, 27 Aug 2010 14:34:51 GMT (1770kb,D)

Title: Ground State of Binary Condensates in harmonic and lattice potentials

with variational ansatz

Authors: S. Gautam and D. Angom

Categories: cond-mat.quant-gas

Comments: 12 pages, 9 figures

\\

We propose an ansatz to study binary condensates, trapped in harmonic and

optical lattice potentials, both in miscible and immiscible domains. The ansatz

is an apt one for two reasons. First, it leads to the smooth transition from

miscible to immiscible domains without any apriori assumptions. And second,

unlike other ansatz proposed in the literature, its applicability is not

constrained by interaction strengths and nature of the trapping potential. We

varify the validity of the ansatz with Gram-Charlier expansion as an entirely

indepedent measure based on the numerical results. In optical lattice

potentials, we analyze the squeezing of the density profiles, due to the

increase in the depth of the optical lattice potential. For this we develope a

model with three potential wells, and define the relationship between the

lattice depth and profile of the condensate.

\\ ( http://arxiv.org/abs/1008.4732 , 1770kb)

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arXiv:1008.4752

Date: Fri, 27 Aug 2010 16:20:08 GMT (523kb)

Title: Unconventional superfluid order in the $F$-band of a bipartite optical

square lattice

Authors: Matthias \"Olschl\"ager, Georg Wirth, and Andreas Hemmerich

Categories: cond-mat.quant-gas

Comments: 4 pages, 3 figures

\\

We report on the first observation of bosons condensed into the energy minima

of an $F$-band of a bipartite square optical lattice. Momentum spectra indicate

that a truly complex-valued staggered angular momentum superfluid order is

established. The corresponding wave function is composed of alternating local

$F_{2x^3-3x} + i F_{2y^3-3y}$-orbits and local $S$-orbits residing in the deep

and shallow wells of the lattice, which are arranged as the black and white

areas of a checkerboard. A pattern of staggered vortical currents arises, which

breaks time reversal symmetry and the translational symmetry of the lattice

potential. We have measured the populations of higher order Bragg peaks in the

momentum spectra for varying relative depths of the shallow and deep lattice

wells and find remarkable agreement with band calculations.

\\ ( http://arxiv.org/abs/1008.4752 , 523kb)

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arXiv:1008.4794

Date: Fri, 27 Aug 2010 20:00:04 GMT (329kb)

Title: Generalized Thermalization in Integrable Systems

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

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

Comments: 7 pages, 7 figures

\\

Once only of theoretical interest, integrable models of one-dimensional (1D)

quantum many-body systems can now be realized with ultracold atoms. In general,

integrable quantum systems that are initially far from equilibrium cannot

undergo thermal relaxation in the usual way, because they are constrained by

the non-trivial set of conserved quantities that make the system integrable.

Relaxation to a non-thermal state has recently been observed in a cold-atom

system close to integrability. At integrability, it is natural to describe the

observables after relaxation by an updated statistical mechanical ensemble: the

generalized Gibbs ensemble (GGE), which is constructed by maximizing the

entropy subject to the integrability constraints. In recent studies, the GGE

has been found to accurately describe various observables in the final steady

state of integrable systems, but a microscopic understanding of its origin and

applicability remains elusive. Here we provide a justification of the GGE based

on a generalized interpretation of the eigenstate thermalization hypothesis

(ETH), which was previously introduced to explain thermalization of

nonintegrable systems.

\\ ( http://arxiv.org/abs/1008.4794 , 329kb)

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arXiv:1008.4864

Date: Sat, 28 Aug 2010 13:05:14 GMT (2915kb,D)

Title: A synthetic electric force acting on neutral atoms

Authors: Yu-Ju Lin, Robert L. Compton, Karina Jimenez-Garcia, William D.

Phillips, James V. Porto, and Ian B. Spielman

Categories: cond-mat.quant-gas

\\

Electromagnetism is a simple example of a gauge theory where the underlying

potentials -- the vector and scalar potentials -- are defined only up to a

gauge choice. The vector potential generates magnetic fields through its

spatial variation and electric fields through its time-dependence. We

experimentally produce a synthetic gauge field that emerges only at low energy

in a rubidium Bose-Einstein condensate: the neutral atoms behave as charged

particles do in the presence of a homogeneous effective vector potential. We

have generated a synthetic electric field through the time dependence of an

effective vector potential, a physical consequence even though the vector

potential is spatially uniform.

\\ ( http://arxiv.org/abs/1008.4864 , 2915kb)

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arXiv:1008.4876

Date: Sat, 28 Aug 2010 16:19:41 GMT (111kb)

Title: Spontaneous symmetry breaking and collapse in bosonic Josephson

junctions

Authors: Giovanni Mazzarella and Luca Salasnich

Categories: cond-mat.quant-gas nlin.PS

Comments: 5 pages, 4 figures, to be published in Phys. Rev. A

\\

We investigate an attractive atomic Bose-Einstein condensate (BEC) trapped by

a double-well potential in the axial direction and by a harmonic potential in

the transverse directions. We obtain numerically, for the first time, a quantum

phase diagram which includes all the three relevant phases of the system:

Josephson, spontaneous symmetry breaking (SSB), and collapse. We consider also

the coherent dynamics of the BEC and calculate the frequency of

population-imbalance mode in the Josephson phase and in the SSB phase up to the

collapse. We show that these phases can be observed by using ultracold vapors

of 7Li atoms in a magneto-optical trap.

\\ ( http://arxiv.org/abs/1008.4876 , 111kb)

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arXiv:1008.4961

Date: Sun, 29 Aug 2010 21:29:12 GMT (14kb)

Title: Fermions and Disorder in Ising and Related Models in Two Dimensions

Authors: V.N. Plechko

Categories: cond-mat.stat-mech

Comments: 11 pages, 1 table, no figures. The discussion is merely based on a

talk given at the International Bogoliubov Conference on Problems of

Theoretical and Mathematical Physics, MIRAS--JINR, Moscow--Dubna, Russia,

August 21--27, 2009

Report-no: 99215

\\

The aspects of phase transitions in the two-dimensional Ising models modified

by quenched and annealed site disorder are discussed in the framework of

fermionic approach based on the reformulation of the problem in terms of

integrals with anticommuting Grassmann variables.

\\ ( http://arxiv.org/abs/1008.4961 , 14kb)

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arXiv:1008.5005

Date: Mon, 30 Aug 2010 05:19:25 GMT (14kb)

Title: Lattice-induced non-adiabatic frequency shifts in optical lattice clocks

Authors: Kyle Beloy

Categories: physics.atom-ph

Comments: 5 pages

\\

We consider the frequency shift in optical lattice clocks which arises from

the coupling of the electronic motion to the atomic motion within the lattice.

For the simplest of 3-D lattice geometries this coupling is shown to only

affect clocks based on blue-detuned lattices. We have estimated the size of

this shift for the prospective strontium lattice clock operating at the 390 nm

blue-detuned magic wavelength. The resulting fractional frequency shift is

found to be on the order of $10^{-18}$ and is largely overshadowed by the

electric quadrupole shift. For lattice clocks based on more complex geometries

or other atomic systems, this shift could potentially be a limiting factor in

clock accuracy.

\\ ( http://arxiv.org/abs/1008.5005 , 14kb)

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arXiv:1008.5086

Date: Mon, 30 Aug 2010 14:14:40 GMT (381kb)

Title: Crossovers in Unitary Fermi Systems

Authors: Henning Heiselberg

Categories: cond-mat.quant-gas

Comments: 50 pages, 15 figures. Contribution to Lecture Notes in Physics

"BCS-BEC crossover and the Unitary Fermi Gas" edited by W. Zwerger

\\

Universality and crossover is described for attractive and repulsive

interactions where, respectively, the BCS-BEC crossover takes place and a

ferromagnetic phase transition is claimed. Crossovers are also described for

optical lattices and multicomponent systems. The crossovers, universal

parameters and phase transitions are described within the Leggett and NSR

models and calculated in detail within the Jastrow-Slater approximation. The

physics of ultracold Fermi atoms is applied to neutron, nuclear and quark

matter, nuclei and electrons in solids whenever possible. Specifically, the

differences between optical lattices and cuprates is discussed w.r.t.

antiferromagnetic, d-wave superfluid phases and phase separation.

\\ ( http://arxiv.org/abs/1008.5086 , 381kb)

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arXiv:1008.5187 (*cross-listing*)

Date: Mon, 30 Aug 2010 23:40:29 GMT (86kb,D)

Title: How quantum bound states bounce and the structure it reveals

Authors: Dean Lee, Michelle Pine

Categories: nucl-th cond-mat.mes-hall cond-mat.quant-gas

Comments: 4 pages, 3 figures

\\

We investigate how quantum bound states bounce from a hard surface. Our

analysis has applications to ab initio calculations of nuclear structure and

elastic deformation, energy levels of excitons in semiconductor quantum dots

and wells, and cold atomic few-body systems on optical lattices with sharp

boundaries. We develop the general theory of elastic reflection for a composite

body from a hard wall. On the numerical side we present universal results for

two-body states and discuss ab initio calculations for general few-body

systems. On the analytical side we derive a universal effective potential that

gives the reflection scattering length for shallow two-body states.

\\ ( http://arxiv.org/abs/1008.5187 , 86kb)

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arXiv:1008.5191 (*cross-listing*)

Date: Tue, 31 Aug 2010 00:22:42 GMT (250kb)

Title: Entanglement from Charge Statistics: Exact Relations for Many-Body

Systems

Authors: H. Francis Song, Christian Flindt, Stephan Rachel, Israel Klich, and

Karyn Le Hur

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

\\

We present exact formulas for the entanglement and R\'{e}nyi entropies

generated at a quantum point contact (QPC) in terms of the statistics of charge

fluctuations, which we illustrate with examples from both equilibrium and

non-equilibrium transport. The formulas are also applicable to groundstate

entanglement in systems described by non-interacting fermions in any dimension,

which in one dimension includes the critical spin-1/2 XX and Ising models where

conformal field theory predictions for the entanglement and R\'{e}nyi entropies

are reproduced from the full counting statistics. These results may play a

crucial role in the experimental detection of many-body entanglement in

mesoscopic structures and cold atoms in optical lattices.

\\ ( http://arxiv.org/abs/1008.5191 , 250kb)

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arXiv:1008.5305

Date: Tue, 31 Aug 2010 12:54:47 GMT (273kb)

Title: The finite-temperature thermodynamics of a trapped unitary Fermi gas

within fractional exclusion statistics

Authors: Fang Qin and Ji-sheng Chen

Categories: cond-mat.other

Comments: 6 pages, 6 figures

Journal-ref: J. Phys. B: 43, 055302 (2010)

DOI: 10.1088/0953-4075/43/5/055302

\\

We utilize a fractional exclusion statistics of Haldane and Wu hypothesis to

study the thermodynamics of a unitary Fermi gas trapped in a harmonic

oscillator potential at ultra-low finite temperature. The entropy per particle

as a function of the energy per particle and energy per particle versus

rescaled temperature are numerically compared with the experimental data. The

study shows that, except the chemical potential behavior, there exists a

reasonable consistency between the experimental measurement and theoretical

attempt for the entropy and energy per particle. In the fractional exclusion

statistics formalism, the behavior of the isochore heat capacity for a trapped

unitary Fermi gas is also analyzed.

\\ ( http://arxiv.org/abs/1008.5305 , 273kb)

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arXiv:1008.5320

Date: Tue, 31 Aug 2010 14:03:17 GMT (412kb)

Title: Energy Relaxation in a 1-D Polariton Condensate

Authors: T. C. H. Liew, M. Wouters, and V. Savona

Categories: cond-mat.mes-hall

Comments: 4 pages, 4 figures

\\

We study the kinetics of polariton condensation in microwires accounting for

the condensation process as well as the energy relaxation of condensed

polaritons due to their scattering with phonons and excitons. In the presence

of a local non-resonant optical pump, a dynamic balance between spatially

dependent relaxation and particle loss develops and excites a series of modes,

roughly equally spaced in energy. Upon comparison, excellent agreement is found

with experimental results reported in [E. Wertz, et al., Nature Phys. doi:

10.1038/nphys1750 (2010)].

\\ ( http://arxiv.org/abs/1008.5320 , 412kb)

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arXiv:1008.5349 (*cross-listing*)

Date: Tue, 31 Aug 2010 16:15:23 GMT (10kb)

Title: The Excitation Spectrum for Weakly Interacting Bosons

Authors: Robert Seiringer

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

Comments: LaTeX, 12 pages

\\

We investigate the low energy excitation spectrum of a Bose gas with weak,

long range repulsive interactions. In particular, we prove that the Bogoliubov

spectrum of elementary excitations with linear dispersion relation for small

momentum becomes exact in the mean-field limit.

\\ ( http://arxiv.org/abs/1008.5349 , 10kb)

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arXiv:1008.5365 (*cross-listing*)

Date: Tue, 31 Aug 2010 17:03:25 GMT (93kb,D)

Title: Layered Quantum Hall Insulators with Ultracold Atoms

Authors: A. Zamora, G. Szirmai and M. Lewenstein

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

Comments: 4 pages

\\

We consider a generalization of the 2-dimensional (2D) quantum-Hall insulator

to a non-compact, non-Abelian gauge group, the Heisenberg-Weyl group. We show

that this kind of insulator is actually a layered 3D insulator with nontrivial

topology. We further show that nontrivial combinations of quantized transverse

conductivities can be engineered with the help of a staggered potential. We

investigate the robustness and topological nature of this conductivity and

connect it to the surface modes of the system. We also propose a very simple

experimental realization with ultracold atoms in 3D confined to a 2D square

lattice with the third dimension being mapped to a gauge coordinate.

\\ ( http://arxiv.org/abs/1008.5365 , 93kb)

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arXiv:1008.5378 (*cross-listing*)

Date: Tue, 31 Aug 2010 17:51:38 GMT (5929kb,D)

Title: Artificial gauge potentials for neutral atoms

Authors: Jean Dalibard, Fabrice Gerbier, Gediminas Juzeli\=unas,Patrik \"Ohberg

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

Comments: 21 pages, 9 figures, submitted to Reviews of Modern Physics

(Colloquium)

\\

When a neutral atom moves in a properly designed laser field, its

center-of-mass motion may mimic the dynamics of a charged particle in a

magnetic field, with the emergence of a Lorentz-like force. In this Colloquium

we present the physical principles at the basis of this artificial (synthetic)

magnetism and relate the corresponding Aharonov-Bohm phase to the Berry's phase

that emerges when the atom follows adiabatically one of its dressed states. We

also discuss some manifestations of artificial magnetism for a cold quantum

gas, in particular in terms of vortex nucleation. We then generalise our

analysis to the simulation of non-Abelian gauge potentials and present some

striking consequences, such as the emergence of an effective spin-orbit

coupling. We address both the case of bulk gases and discrete systems, where

atoms are trapped in an optical lattice.

\\ ( http://arxiv.org/abs/1008.5378 , 5929kb)

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arXiv:1008.5388

Date: Tue, 31 Aug 2010 18:54:08 GMT (41kb)

Title: Using off-diagonal confinement as a cooling method

Authors: V.G. Rousseau, K. Hettiarachchilage, M. Jarrell, and J. Moreno

Categories: cond-mat.quant-gas

Comments: 6 pages, 6 figures

\\

In a recent letter [Phys. Rev. Lett. 104, 167201 (2010)] we proposed a new

confining method for ultracold atoms on optical lattices, based on off-diagonal

confinement (ODC). This method was shown to have distinct advantages over the

conventional diagonal confinement (DC) that makes use of a trapping potential,

including the existence of pure Mott phases and highly populated condensates.

In this paper we show that the ODC method can also lead to temperatures that

are smaller than with the conventional DC method, depending on the control

parameters. We determine these parameters using exact diagonalizations for the

hard-core case, then we extend our results to the soft-core case by performing

quantum Monte Carlo (QMC) simulations for both DC and ODC systems at fixed

temperatures, and analysing the corresponding entropies. We also propose a

method for measuring the entropy in QMC simulations.

\\ ( http://arxiv.org/abs/1008.5388 , 41kb)

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arXiv:1009.0016

Date: Tue, 31 Aug 2010 20:05:18 GMT (593kb)

Title: Observation of scale invariance and universality in two-dimensional Bose

gases

Authors: Chen-Lung Hung, Xibo Zhang, Nathan Gemelke, and Cheng Chin

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

\\

The collective behavior of a many-body system near a continuous phase

transition is insensitive to the details of its microscopic physics [1].

Characteristic features near the phase transition, called critical phenomena,

are that the thermodynamic observables follow generalized scaling laws [1]. The

Berezinskii-Kosterlitz-Thouless (BKT) phase transition [2, 3] in

two-dimensional (2D) Bose gases presents a particularly interesting case

because the marginal dimensionality and intrinsic scaling symmetry result in a

broad fluctuation regime which manifests itself in an extended range of scale-

invariant and universal behavior. Studies on BKT transition in cold atoms have

stimulated great interest in recent years [4-7], clear demonstration of a

universal behavior near the phase transition, however, has remained an elusive

goal. Here we report the observation of a global invariance of scale and a

universal description of 2D gases with different interaction strengths. The

extracted universal thermodynamic functions confirm the wide critical regime

near the BKT phase transition, provide a sensitive test to Monte Carlo

calculations [8-10], and point toward a growing density-density correlations in

the critical regime. Our assay raises new perspectives to explore further

universal phenomena in the realm of classical and quantum critical physics.

\\ ( http://arxiv.org/abs/1009.0016 , 593kb)

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arXiv:1009.0040

Date: Tue, 31 Aug 2010 22:23:17 GMT (100kb)

Title: Color Superfluid and Trionic State of Attractive Three-Component Lattice

Fermionic Atoms at Finite Temperatures

Authors: Kensuke Inaba and Sei-ichiro Suga

Categories: cond-mat.quant-gas

Comments: 8 pages, 5 figures

\\

We investigate the finite-temperature properties of attractive

three-component (colors) fermionic atoms in optical lattices using a

self-energy functional approach. As the strength of the attractive interaction

increases in the low temperature region, a second order transition occurs from

a Fermi liquid to a color superfluid (CSF). In the strong attractive region, a

first order transition occurs from a CSF to a trionic state. In the high

temperature region, a crossover between a Fermi liquid and a trionic state is

observed with increasing the strength of the attractive interaction. The

crossover region for fixed temperature is almost independent of filling.

\\ ( http://arxiv.org/abs/1009.0040 , 100kb)

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arXiv:1009.0043

Date: Tue, 31 Aug 2010 22:34:52 GMT (393kb,D)

Title: The phase diagram of 2D polar condensates in a magnetic field

Authors: A. J. A. James and A. Lamacraft

Categories: cond-mat.quant-gas

Comments: 4 pages, 7 figures

\\

Spin one condensates in the polar (antiferromagnetic) phase in two dimensions

are shown to undergo a transition of the Ising type, in addition to the

expected Kosterlitz--Thouless (KT) transition of half vortices, due to the

quadratic Zeeman effect. We establish the phase diagram in terms of temperature

and the strength of the Zeeman effect using Monte Carlo simulations. When the

Zeeman effect is sufficiently strong the Ising and KT transitions merge. For

very strong Zeeman field the remaining transition is of the familiar integer KT

type.

\\ ( http://arxiv.org/abs/1009.0043 , 393kb)

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arXiv:1009.0095 (*cross-listing*)

Date: Wed, 1 Sep 2010 05:52:43 GMT (809kb)

Title: Stark-tuned F\"orster resonance and dipole blockade between 2 to 5 cold

Rydberg atoms: Monte-Carlo simulations for various spatial configurations

Authors: I.I.Ryabtsev, D.B.Tretyakov, I.I.Beterov, V.M.Entin, and E.A.Yakshina

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

Comments: 11 pages, 7 figures, submitted to PRA

\\

Results of the numerical Monte-Carlo simulations for the Stark-tuned

F\"orster resonance and dipole blockade between 2 to 5 cold rubidium Rydberg

atoms in various spatial configurations are presented. Effect of the atom

spatial uncertainties on the resonance amplitude and spectrum is investigated.

Feasibility to observe coherent Rabi-like population oscillations at a

F\"orster resonance between two cold Rydberg atoms is analyzed. Spectra and

fidelity of the Rydberg dipole blockade are calculated for various experimental

conditions, including nonzero detuning from the F\"orster resonance and finite

laser line width. The results are discussed in the context of quantum

information processing with Rydberg atoms.

\\ ( http://arxiv.org/abs/1009.0095 , 809kb)

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arXiv:1009.0194 (*cross-listing*)

Date: Wed, 1 Sep 2010 14:49:38 GMT (1106kb,D)

Title: Non-equilibrium dynamics of bosonic atoms in optical lattices:

Decoherence of many-body states due to spontaneous emission

Authors: H. Pichler, A. J. Daley, P. Zoller

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

Comments: 17 pages, 14 figures

\\

We analyze in detail the heating of bosonic atoms in an optical lattice due

to incoherent scattering of light from the lasers forming the lattice. Because

atoms scattered into higher bands do not thermalize on the timescale of typical

experiments, this process cannot be described by the total energy increase in

the system alone (which is determined by single-particle effects). The heating

instead involves an important interplay between the atomic physics of the

heating process and the many-body physics of the state. We characterize the

effects on many-body states for various system parameters, where we observe

important differences in the heating for strongly and weakly interacting

regimes, as well as a strong dependence on the sign of the laser detuning from

the excited atomic state. We compute heating rates and changes to

characteristic correlation functions based both on perturbation theory

calculations, and a time-dependent calculation of the dissipative many-body

dynamics. The latter is made possible for 1D systems by combining

time-dependent density matrix renormalization group (t-DMRG) methods with

quantum trajectory techniques.

\\ ( http://arxiv.org/abs/1009.0194 , 1106kb)

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arXiv:1009.0349

Date: Thu, 2 Sep 2010 08:29:38 GMT (362kb)

Title: FFLO states and quantum oscillations in mesoscopic superconductors and

superfluid ultracold Fermi gases

Authors: A.V.Samokhvalov, A.S.Mel'nikov, A.I.Buzdin

Categories: cond-mat.quant-gas

Comments: 11 pages, 5 figures, Submitted to PRA

\\

We have studied the distinctive features of the

Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) instability and phase transitions in

two--dimensional (2D) mesoscopic superconductors placed in magnetic field of

arbitrary orientation and rotating superfluid Fermi gases with imbalanced state

populations. Using a generalized version of the phenomenological

Ginzburg-Landau theory we have shown that the FFLO states are strongly modified

by the effect of the trapping potential confining the condensate. The

phenomenon of the inhomogeneous state formation is determined by the interplay

of three length scales: (i) length scale of the FFLO instability; (ii) 2D

system size; (iii) length scale associated with the orbital effect caused

either by the Fermi condensate rotation or magnetic field component applied

perpendicular to the superconducting disc. We have studied this interplay and

resulting quantum oscillation effects in both superconducting and superfluid

finite -- size systems with FFLO instability and described the hallmarks of the

FFLO phenomenon in a restricted geometry. The finite size of the system is

shown to affect strongly the conditions of the observability of switching

between the states with different vorticities.

\\ ( http://arxiv.org/abs/1009.0349 , 362kb)

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arXiv:1009.0483

Date: Thu, 2 Sep 2010 17:33:55 GMT (394kb)

Title: Dissipative defect modes in periodic structures

Authors: Yaroslav V. Kartashov, Vladimir V. Konotop, Victor A. Vysloukh, Lluis

Torner

Categories: physics.optics

Comments: 4 pages, 3 figures

Journal-ref: Optics Letters 35, 1638 (2010)

\\

We show that periodic optical lattices imprinted in cubic nonlinear media

with strong two-photon absorption and localized linear gain landscapes support

stable dissipative defect modes in both focusing and defocusing media. Their

shapes and transverse extent are determined by the propagation constant that

belongs to a gap of the lattice spectrum which, in turn, is determined by the

relation between gain and losses. One-hump and two-hump dissipative defect

modes are obtained.

\\ ( http://arxiv.org/abs/1009.0483 , 394kb)

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arXiv:1008.2096 (*cross-listing*)

replaced with revised version Fri, 27 Aug 2010 01:09:00 GMT (228kb)

Title: Dynamic localization of cold atoms in driven lattices: an overlooked

phase

Authors: K. Kudo and T.S. Monteiro

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

Comments: 5 pages, 2 figures

\\ ( http://arxiv.org/abs/1008.2096 , 228kb)

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arXiv:1004.2567

replaced with revised version Fri, 27 Aug 2010 15:04:38 GMT (98kb)

Title: Effective field theory and dispersion law of the phonons of a

non-relativistic superfluid

Authors: Miguel \'Angel Escobedo and Cristina Manuel

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

Comments: 14 pages, 2 figures. References added

Journal-ref: Phys. Rev. A 82, 023614 (2010)

DOI: 10.1103/PhysRevA.82.023614

\\ ( http://arxiv.org/abs/1004.2567 , 98kb)

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arXiv:1007.4038

replaced with revised version Sun, 29 Aug 2010 22:55:59 GMT (4195kb)

Title: Robust Mesoscopic Superposition of Strongly Correlated Ultracold Atoms

Authors: David W. Hallwood, Thomas Ernst, Joachim Brand

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

Comments: 4 pages, 3 figures

\\ ( http://arxiv.org/abs/1007.4038 , 4195kb)

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arXiv:0911.0890

replaced with revised version Mon, 30 Aug 2010 22:47:46 GMT (474kb)

Title: Phase diagram of the hardcore Bose-Hubbard model on a checkerboard

superlattice

Authors: Itay Hen, M. Iskin, Marcos Rigol

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

Comments: 11 pages, 7 figures

Journal-ref: Phys. Rev. B 81, 064503 (2010)

DOI: 10.1103/PhysRevB.81.064503

\\ ( http://arxiv.org/abs/0911.0890 , 474kb)

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arXiv:1004.3111

replaced with revised version Tue, 31 Aug 2010 05:42:09 GMT (496kb)

Title: Cooper pairing and BCS-BEC evolution in mixed-dimensional Fermi gases

Authors: M. Iskin and A. L. Subasi

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

Comments: 9 pages with 4 figures

\\ ( http://arxiv.org/abs/1004.3111 , 496kb)

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arXiv:0912.2743 (*cross-listing*)

replaced with revised version Tue, 31 Aug 2010 10:18:54 GMT (91kb)

Title: Fast Converging Path Integrals for Time-Dependent Potentials

Authors: Antun Balaz, Ivana Vidanovic, Aleksandar Bogojevic, Axel Pelster

Categories: cond-mat.stat-mech cond-mat.other cond-mat.quant-gas hep-th

physics.comp-ph quant-ph

Comments: 19 pages, 9 figures

\\ ( http://arxiv.org/abs/0912.2743 , 91kb)

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arXiv:0911.1688

replaced with revised version Tue, 31 Aug 2010 15:08:47 GMT (18kb)

Title: Two-Cooper-pair problem and the Pauli exclusion principle

Authors: W. V. Pogosov, M. Combescot, M. Crouzeix

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

Comments: 9 pages, no figures, final version

Journal-ref: Phys. Rev. B 81, 174514 (2010)

DOI: 10.1103/PhysRevB.81.174514

\\ ( http://arxiv.org/abs/0911.1688 , 18kb)

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arXiv:1006.5314 (*cross-listing*)

replaced with revised version Tue, 31 Aug 2010 15:39:12 GMT (62kb)

Title: Photoassociation of a cold atom-molecule pair: long-range

quadrupole-quadrupole interactions

Authors: M. Lepers, O. Dulieu, and V. Kokoouline

Categories: quant-ph physics.atom-ph physics.chem-ph

Comments: 5 figures

\\ ( http://arxiv.org/abs/1006.5314 , 62kb)

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arXiv:1004.4581

replaced with revised version Tue, 31 Aug 2010 22:26:47 GMT (171kb)

Title: Quantum de-mixing in binary mixtures of dipolar bosons

Authors: Piyush Jain and Massimo Boninsegni

Categories: cond-mat.quant-gas

Comments: 6 figures

\\ ( http://arxiv.org/abs/1004.4581 , 171kb)

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arXiv:1006.4674 (*cross-listing*)

replaced with revised version Wed, 1 Sep 2010 00:15:47 GMT (524kb,D)

Title: Spin gradient demagnetization cooling of ultracold atoms

Authors: Patrick Medley, David M. Weld, Hirokazu Miyake, David E. Pritchard,

and Wolfgang Ketterle

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

Comments: 10 pages, 4 figures; (v2) Shortened and edited for clarity

\\ ( http://arxiv.org/abs/1006.4674 , 524kb)

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arXiv:0908.3547

replaced with revised version Wed, 1 Sep 2010 05:12:24 GMT (130kb)

Title: Quasiparticle excitations in Bose-Fermi mixtures

Authors: Shimul Akhanjee

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

Comments: 9 pages, 6 eps figures. Version accepted for publication

Journal-ref: Phys. Rev. B 82, 075138 (2010)

DOI: 10.1103/PhysRevB.82.075138

\\ ( http://arxiv.org/abs/0908.3547 , 130kb)

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arXiv:1006.0636

replaced with revised version Wed, 1 Sep 2010 11:51:32 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 (of which 5 in color)

\\ ( http://arxiv.org/abs/1006.0636 , 816kb)

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arXiv:0910.1749 (*cross-listing*)

replaced with revised version Wed, 1 Sep 2010 14:36:48 GMT (202kb)

Title: Fermionisation dynamics of a strongly interacting 1D Bose gas after an

interaction quench

Authors: Dominik Muth, Bernd Schmidt, and Michael Fleischhauer

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

Comments: 11 pages, 5 figures, extended

Journal-ref: New Journal of Physics 12, 083065 (2010)

DOI: 10.1088/1367-2630/12/8/083065

\\ ( http://arxiv.org/abs/0910.1749 , 202kb)

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arXiv:1003.0600

replaced with revised version Wed, 1 Sep 2010 15:42:30 GMT (41kb,D)

Title: Atom-Dimer Scattering in a Three-Component Fermi Gas

Authors: T. Lompe, T. B. Ottenstein, F. Serwane, K. Viering, A. N. Wenz, G.

Z\"urn and S. Jochim

Categories: cond-mat.quant-gas

Comments: 5 pages, 3 figures

\\ ( http://arxiv.org/abs/1003.0600 , 41kb)

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arXiv:1004.0510

replaced with revised version Wed, 1 Sep 2010 19:47:22 GMT (50kb)

Title: Dynamical mean field solution of the Bose-Hubbard model

Authors: Peter Anders, Emanuel Gull, Lode Pollet, Matthias Troyer, Philipp

Werner

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

Comments: 11 pages, 3 figures

Journal-ref: Phys. Rev. Lett. 105, 096402 (2010)

\\ ( http://arxiv.org/abs/1004.0510 , 50kb)

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arXiv:0909.4556

replaced with revised version Wed, 1 Sep 2010 21:04:58 GMT (116kb)

Title: Comment on "Quenches in quantum many-body systems: One-dimensional

Bose-Hubbard model reexamined" [arXiv:0810.3720]

Authors: Marcos Rigol

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

Comments: 2 pages, 1 figure, as published

Journal-ref: Phys. Rev. A 82, 037601 (2010)

DOI: 10.1103/PhysRevA.82.037601

\\ ( http://arxiv.org/abs/0909.4556 , 116kb)

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arXiv:1008.4610 (*cross-listing*)

replaced with revised version Thu, 2 Sep 2010 02:33:54 GMT (172kb,D)

Title: Thermometry and Refrigeration in a Two-Component Mott Insulator of

Ultracold Atoms

Authors: David M. Weld, Hirokazu Miyake, Patrick Medley, David E. Pritchard,

Wolfgang Ketterle

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

Comments: 5 pages, 5 figures (v2): Edited for clarity

\\ ( http://arxiv.org/abs/1008.4610 , 172kb)

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arXiv:1008.2260 (*cross-listing*)

replaced with revised version Thu, 2 Sep 2010 06:23:11 GMT (1425kb,D)

Title: The Efimov effect in lithium 6

Authors: Pascal Naidon and Masahito Ueda

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

Comments: 12 pages, 8 figures Corrected erroneous statement after Eq. (5)

\\ ( http://arxiv.org/abs/1008.2260 , 1425kb)

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arXiv:0912.3531 (*cross-listing*)

replaced with revised version Thu, 2 Sep 2010 09:00:51 GMT (404kb,D)

Title: Universality in dissipative Landau-Zener transitions

Authors: Peter P. Orth, Adilet Imambekov, Karyn Le Hur

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

Comments: 5 pages, 2 figs; added finite temperature results

\\ ( http://arxiv.org/abs/0912.3531 , 404kb)

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arXiv:1003.5235

replaced with revised version Thu, 2 Sep 2010 15:14:25 GMT (82kb)

Title: Two-body recombination in a quantum mechanical lattice gas: Entropy

generation and probing of short-range magnetic correlations

Authors: Stefan K. Baur, Erich J. Mueller

Categories: cond-mat.quant-gas

Comments: 6 pages, 3 figures - v4, published version

Journal-ref: Phys. Rev. A 82, 023626 (2010)

DOI: 10.1103/PhysRevA.82.023626

\\ ( http://arxiv.org/abs/1003.5235 , 82kb)

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Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Associate Professor in Physics School of Mathematics and Physics, ph : +61 7 334 69824 The University of Queensland, fax : +61 7 336 51242 Brisbane, QLD 4072, mdavis_at_physics.uq.edu.au Australia. www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland ========================================================================= _______________________________________________ Matts-arxiv mailing list Matts-arxiv_at_lists.sps.uq.edu.auReceived on Thu Nov 04 2010 - 10:05:09 EST

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