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

Date: Sat, 05 Sep 2009 20:22:05 +1000

Date: Sat, 05 Sep 2009 20:22:05 +1000

Dear subscribers,

The bus is still going... it looks like four weeks worth is going to be the

limit for today. This week was compiled by Andy Ferris. There are a whopping

38 new preprints and 16 replacements.

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arXiv:0907.2928

Date: Thu, 16 Jul 2009 20:13:00 GMT (340kb)

Title: Dynamical Mean Field Theory for the Bose-Hubbard Model

Authors: Wen-Jun Hu and Ning-Hua Tong

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

Comments: 11 pages, 8 figures

\\

The dynamical mean field theory (DMFT), which is successful in the study of

strongly correlated fermions, was recently extended to boson systems [Phys.

Rev. B {\textbf 77}, 235106 (2008)]. In this paper, we employ the bosonic DMFT

to study the Bose-Hubbard model which describes on-site interacting bosons in a

lattice. Using exact diagonalization as the impurity solver, we get the DMFT

solutions for the Green's function, the occupation density, as well as the

condensate fraction on a Bethe lattice. Various phases are identified: the Mott

insulator, the Bose-Einstein condensed (BEC) phase, and the normal phase. At

finite temperatures, we obtain the crossover between the Mott-like regime and

the normal phase, as well as the BEC-to-normal phase transition. Phase diagrams

on the $\mu/U-\tilde{t}/U$ plane and on the $T/U-\tilde{t}/U$ plane are

produced ($\tilde{t}$ is the scaled hopping amplitude). We compare our results

with the previous ones, and discuss the implication of these results to

experiments.

\\ ( http://arxiv.org/abs/0907.2928 , 340kb)

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arXiv:0907.2948

Date: Thu, 16 Jul 2009 22:39:50 GMT (230kb,D)

Title: Simulating Stochastic Dynamics Using Large Time Steps

Authors: O. Corradini, P. Faccioli and H. Orland

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

Comments: 17 pager, 7 figures

\\

We present a novel approach to investigate the long-time stochastic dynamics

of multi-dimensional classical systems, in contact with a heat-bath. When the

potential energy landscape is rugged, the kinetics displays a decoupling of

short and long time scales and both

Molecular Dynamics (MD) or Monte Carlo (MC) simulations are generally

inefficient. Using a field theoretic approach, we perform analytically the

average over the short-time stochastic fluctuations. This way, we obtain an

effective theory, which generates the same long-time dynamics of the original

theory, but has a lower time resolution power. Such an approach is used to

develop an improved version of the MC algorithm, which is particularly suitable

to investigate the dynamics of rare conformational transitions. In the specific

case of molecular systems at room temperature, we show that elementary

integration time steps used to simulate the effective theory can be chosen a

factor ~100 larger than those used in the original theory. Our results are

illustrated and tested on a simple system, characterized by a rugged energy

landscape.

\\ ( http://arxiv.org/abs/0907.2948 , 230kb)

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arXiv:0907.2972

Date: Fri, 17 Jul 2009 11:58:48 GMT (619kb)

Title: Textures and non-Abelian vortices in atomic d-wave paired Fermi

condensates

Authors: H. M. Adachi, Y. Tsutsumi, J. A. M. Huhtam\"aki, K. Machida

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

Comments: 5 pages, 4 figures

\\

We report on fundamental properties of superfluids with d-wave pairing

symmetry. We consider neutral atomic Fermi gases in a harmonic trap, the

pairing being produced by a Feshbach resonance via a d-wave interaction

channel. A Ginzburg-Landau (GL) functional is constructed which is symmetry

constrained for five component order parameters (OP). We find OP textures in

the cyclic phase and stability conditions for a non-Abelian fractional

1/3-vortex under rotation. It is proposed how to create the intriguing

1/3-vortex experimentally in atomic gases via optical means.

\\ ( http://arxiv.org/abs/0907.2972 , 619kb)

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arXiv:0907.3017

Date: Fri, 17 Jul 2009 08:20:54 GMT (159kb)

Title: Spin drag in noncondensed Bose gases

Authors: R.A. Duine, H.T.C. Stoof

Categories: cond-mat.quant-gas

\\

We show how time-dependent magnetic fields lead to spin motive forces and

spin drag in a spinor Bose gas. We propose to observe these effects in a

toroidal trap and analyze this particular proposal in some detail. In the

linear-response regime we define a transport coefficient that is analogous to

the usual drag resistivity in electron bilayer systems. Due to Bose enhancement

of atom-atom scattering, this coefficient strongly increases as temperature is

lowered. We also investigate the effects of heating.

\\ ( http://arxiv.org/abs/0907.3017 , 159kb)

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arXiv:0907.3022

Date: Fri, 17 Jul 2009 09:03:47 GMT (401kb)

Title: Numerical approaches to time evolution of complex quantum systems

Authors: Holger Fehske, Jens Schleede, Gerald Schubert, Gerhard Wellein,

Vladimir S. Filinov, and Alan R. Bishop

Categories: cond-mat.str-el

Comments: 8 pages, 3 figures

Journal-ref: Phys. Lett. A 373, 2182 (2009)

\\

We examine several numerical techniques for the calculation of the dynamics

of quantum systems. In particular, we single out an iterative method which is

based on expanding the time evolution operator into a finite series of

Chebyshev polynomials. The Chebyshev approach benefits from two advantages over

the standard time-integration Crank-Nicholson scheme: speedup and efficiency.

Potential competitors are semiclassical methods such as the Wigner-Moyal or

quantum tomographic approaches. We outline the basic concepts of these

techniques and benchmark their performance against the Chebyshev approach by

monitoring the time evolution of a Gaussian wave packet in restricted

one-dimensional (1D) geometries. Thereby the focus is on tunnelling processes

and the motion in anharmonic potentials. Finally we apply the prominent

Chebyshev technique to two highly non-trivial problems of current interest: (i)

the injection of a particle in a disordered 2D graphene nanoribbon and (ii) the

spatiotemporal evolution of polaron states in finite quantum systems. Here,

depending on the disorder/electron-phonon coupling strength and the device

dimensions, we observe transmission or localisation of the matter wave.

\\ ( http://arxiv.org/abs/0907.3022 , 401kb)

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arXiv:0907.3032

Date: Fri, 17 Jul 2009 09:57:28 GMT (588kb)

Title: Collective Oscillations of an Imbalanced Fermi Gas: Axial Compression

Modes and Polaron Effective Mass

Authors: Sylvain Nascimbene (LKB - Lhomond), Nir Navon (LKB - Lhomond), Kaijun

Jiang (LKB - Lhomond), Leticia Tarruell (ETH), Martin Teichmann

(Max-Born-Institut), Jason Mckeever (IOS), Fr\'ed\'eric Chevy (LKB -

Lhomond), Christophe Salomon (LKB - Lhomond)

Categories: cond-mat.other

Comments: 4 pages, 4 figures, submitted to PRL

\\

We investigate the low-lying compression modes of a unitary Fermi gas with

imbalanced spin populations. For low polarization, the strong coupling between

the two spin components leads to a hydrodynamic behavior of the cloud. For

large population imbalance we observe a decoupling of the oscillations of the

two spin components, giving access to the effective mass of the Fermi polaron,

a quasi-particle composed of an impurity dressed by particle-hole pair

excitations in a surrounding Fermi sea. We find $m^*/m=1.17(10)$, in agreement

with the most recent theoretical predictions.

\\ ( http://arxiv.org/abs/0907.3032 , 588kb)

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arXiv:0907.3077

Date: Fri, 17 Jul 2009 13:46:18 GMT (122kb)

Title: Core sizes and dynamic instabilities of giant vortices in dilute

Bose-Einstein condensates

Authors: Pekko Kuopanportti, Emil Lundh, Jukka Huhtam\"aki, Ville Pietil\"a,

Mikko M\"ott\"onen

Categories: cond-mat.quant-gas

Comments: 8 pages, 6 figures

\\

Motivated by recent demonstration of cyclic addition of quantized vorticity

into a Bose-Einstein condensate, the vortex pump, we study dynamic

instabilities and core sizes of giant vortices. The core size is found to

increase roughly as a square-root function of the quantum number of the vortex,

whereas the strength of the dynamic instability either saturates to a fairly

low value or increases extremely slowly for large quantum numbers. Our studies

suggest that giant vortices of very high angular momenta may be achieved by

gradually increasing the operation frequency of the vortex pump.

\\ ( http://arxiv.org/abs/0907.3077 , 122kb)

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arXiv:0907.3080

Date: Fri, 17 Jul 2009 18:48:08 GMT (37kb)

Title: Stable Topological Superfluid Phase of Ultracold Polar Fermionic

Molecules

Authors: N. R. Cooper and G. V. Shlyapnikov

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

\\

We show that single-component fermionic polar molecules confined to a 2D

geometry and dressed by a microwave field, may acquire an attractive $1/r3$

dipole-dipole interaction leading to superfluid p-wave pairing at sufficiently

low temperatures even in the BCS regime. The emerging state is the topological

$p_x+ip_y$ phase promising for topologically protected quantum information

processing. The main decay channel is via collisional transitions to dressed

states with lower energies and is rather slow, setting a lifetime of the order

of seconds at 2D densities $\sim 108$ cm$^{-2}$.

\\ ( http://arxiv.org/abs/0907.3080 , 37kb)

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arXiv:0907.3096

Date: Fri, 17 Jul 2009 16:01:06 GMT (222kb,D)

Title: Second Josephson oscillations

Authors: M. P. Strzys and J. R. Anglin

Categories: cond-mat.quant-gas

\\

As a model for mesoscopic quantum systems in thermal contact, we consider a

four-mode Bose-Hubbard model with two greatly differing tunneling rates. By a

series of Holstein-Primakoff transformations we show that the low-frequency

dynamics of this system consists in general of two slow Josephson oscillations,

rather than the single slow mode predicted by linear Bogoliubov theory. We

identify the second slow Josephson oscillation as a heat exchange mode

analogous to second sound.

\\ ( http://arxiv.org/abs/0907.3096 , 222kb)

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arXiv:0907.3134

Date: Fri, 17 Jul 2009 19:22:30 GMT (54kb)

Title: Dynamical delocalization of Majorana edge states by sweeping across a

quantum critical point

Authors: A. Bermudez, L. Amico, and M. A. Martin-Delgado

Categories: cond-mat.str-el

Comments: Submitted to the Special Issue on "Dynamics and Thermalization in

Isolated Quantum Many-Body Systems" in New Journal of Physics. Editors:M.

Cazalilla, M. Rigol

\\

We study the adiabatic dynamics of Majorana fermions across a quantum phase

transition. We show that the Kibble-Zurek scaling, which describes the density

of bulk defects produced during the critical point crossing, is not valid for

edge Majorana fermions. Therefore, the dynamics governing an edge state quench

is nonuniversal and depends on the topological features of the system. Besides,

we show that the localization of Majorana fermions is a necessary ingredient to

guaranty robustness against defect production.

\\ ( http://arxiv.org/abs/0907.3134 , 54kb)

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arXiv:0706.3300

Date: Fri, 22 Jun 2007 09:43:14 GMT (16kb)

Title: Trapped Bose gases with large positive scattering length

Authors: M. Th{\o}gersen, D.V. Fedorov, and A.S. Jensen

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

Journal-ref: EPL 79 (2007) 40002

DOI: 10.1209/0295-5075/79/40002

\\

We calculate the energy and the condensate fraction of a system of trapped

bosons interacting via a short-range two-body potential with positive

scattering length. The potential is attractive and has a two-body bound state.

When the scattering length is small compared to the trap length the system is

model independent: all potential models -- attractive, repulsive and zero-range

-- provide similar results. When the scattering length is large the attractive

model differs qualitatively from the repulsive and zero-range models. In this

regime the system with attractive potential becomes independent of the

scattering length, with both the energy and the condensate fraction converging

towards finite constants.

\\ ( http://arxiv.org/abs/0706.3300 , 16kb)

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arXiv:0806.3839

Date: Tue, 24 Jun 2008 09:39:27 GMT (22kb)

Title: N-body Efimov states of trapped bosons

Authors: M. Th{\o}gersen, D. V. Fedorov, A. S. Jensen

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

Journal-ref: Europhys. Lett., 83 (2008) 30012

DOI: 10.1209/0295-5075/83/30012

\\

We demonstrate the possibility of existence of meta-stable N-body Efimov

states in trapped Bose systems with large scattering length. We calculate

spectra of trapped systems of N=3,4,5,6, and 7 bosons using a stochastic

variational method with a restricted correlated Gaussian basis. For each system

the calculations reveal a series of Efimov states where the energy and the

r.m.s. radius exhibit the characteristic exponential dependence upon the state

number. We also estimate the contribution of these states to the recombination

rate of Bose-Einstein condensates.

\\ ( http://arxiv.org/abs/0806.3839 , 22kb)

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arXiv:0907.2992

Date: Fri, 17 Jul 2009 06:50:45 GMT (337kb)

Title: Dynamics of entanglement in a two-mode nonlinear Jaynes-Cummings mode

Authors: A B M Ahmed and S Sivakumar

Categories: quant-ph

Comments: 26 pages;9 figures

\\

Dynamics of entanglement due to intensity-dependent interaction between a

two-level atom and a single-mode electromagnetic field in a Kerr medium is

studied. The form of the interaction is such that the Hamiltonian evolution is

exactly solvable. The Hamiltonian is shown to be a deformed Jaynes-Cummings

model admitting a closed, symmetric algebra. Dynamics of population inversion

and atom-field entanglement are studied taking the initial state of the field

to be either a coherent state or a squeezed vacuum. Analysis is extended to the

case of a two-mode cavity field interacting with a two-level atom. For the

two-mode case, the initial field is a pair coherent state or a two-mode

squeezed vacuum. Effects due to nonlinearity, intensity-dependent interaction

and detuning on the dynamics are discussed and compared with those of the

single-mode case.

\\ ( http://arxiv.org/abs/0907.2992 , 337kb)

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arXiv:0907.2193

Date: Mon, 13 Jul 2009 16:04:36 GMT (463kb)

Title: Functional renormalization group approach to the BCS-BEC crossover

Authors: S. Diehl, S. Floerchinger, H. Gies, J. M. Pawlowski, C. Wetterich

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

Comments: 28 pages, 12 figures

\\

The phase transition to superfluidity and the BCS-BEC crossover for an

ultracold gas of fermionic atoms is discussed within a functional

renormalization group approach. Non-perturbative flow equations, based on an

exact renormalization group equation, describe the scale dependence of the

flowing or average action. They interpolate continuously from the microphysics

at atomic or molecular distance scales to the macroscopic physics at much

larger length scales, as given by the interparticle distance, the correlation

length, or the size of the experimental probe. We discuss the phase diagram as

a function of the scattering length and the temperature and compute the gap,

the correlation length and the scattering length for molecules. Close to the

critical temperature, we find the expected universal behavior. Our approach

allows for a description of the few-body physics (scattering and molecular

binding) and the many-body physics within the same formalism.

\\ ( http://arxiv.org/abs/0907.2193 , 463kb)

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arXiv:0907.3172

Date: Sat, 18 Jul 2009 01:19:31 GMT (594kb)

Title: Solitons in Tonks-Girardeau gas with dipolar interactions

Authors: B. B. Baizakov, F. Kh. Abdullaev, B. A. Malomed, M. Salerno

Categories: cond-mat.quant-gas

Comments: 15 pages, 8 figures, accepted by J. Phys. B: At. Mol. Opt. Phys

\\

The existence of bright solitons in the model of the Tonks-Girardeau (TG) gas

with dipole-dipole (DD) interactions is reported. The governing equation is

taken as the quintic nonlinear Schr\"{o}dinger equation (NLSE) with the

nonlocal cubic term accounting for the DD attraction. In different regions of

the parameter space (the dipole moment and atom number), matter-wave solitons

feature flat-top or compacton-like shapes. For the flat-top states, the NLSE

with the local cubic-quintic (CQ) nonlinearity is shown to be a good

approximation. Specific dynamical effects are studied assuming that the

strength of the DD interactions is ramped up or drops to zero. Generation of

dark-soliton pairs in the gas shrinking under the action of the intensifying DD

attraction is observed. Dark solitons exhibit the particle-like collision

behavior. Peculiarities of dipole solitons in the TG gas are highlighted by

comparison with the NLSE including the local CQ terms. Collisions between the

solitons are studied too. In many cases, the collisions result in merger of the

solitons into a breather, due to strong attraction between them.

\\ ( http://arxiv.org/abs/0907.3172 , 594kb)

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arXiv:0907.3197

Date: Sat, 18 Jul 2009 10:02:03 GMT (132kb)

Title: Analytical theory of the dressed bound state in highly polarized Fermi

gases

Authors: R. Combescot, S. Giraud and X. Leyronas

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

Comments: 5 pages, 3 figures

\\

We present an analytical treatment of a single \down atom within a Fermi sea

of \up atoms, when the interaction is strong enough to produce a bound state,

dressed by the Fermi sea. Our method makes use of a diagrammatic analysis, with

the involved diagrams taking only into account at most two particle-hole pairs

excitations. The agreement with existing Monte-Carlo results is excellent. In

the BEC limit our equation reduces exactly to the Skorniakov and

Ter-Martirosian equation. We present results when \up and \down atoms have

different masses, which is of interest for experiments in progress.

\\ ( http://arxiv.org/abs/0907.3197 , 132kb)

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arXiv:0907.3198

Date: Sat, 18 Jul 2009 10:08:46 GMT (20kb)

Title: Analytic thermodynamics and thermometry of Gaudin-Yang Fermi gases

Authors: Erhai Zhao, Xi-Wen Guan, W. Vincent Liu, M. T. Batchelor, Masaki

Oshikawa

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

Comments: 4 pages, 2 figures

\\

We study the thermodynamics of a one-dimensional attractive Fermi gas (the

Gaudin-Yang model) with spin imbalance. The infinite number of coupled

thermodynamic Bethe ansatz equations are analytically reduced to a simple,

powerful set of four algebraic equations. The simplified equations become

universal and exact in the experimental regime of strong interaction and

relatively low temperature. Using the new formulation, we discuss the

qualitative features of finite-temperature crossover and make quantitative

predictions on the density profiles in traps. We propose a practical two-stage

scheme to achieve accurate thermometry for a trapped spin-imbalanced Fermi gas.

\\ ( http://arxiv.org/abs/0907.3198 , 20kb)

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arXiv:0907.3206

Date: Sat, 18 Jul 2009 11:06:46 GMT (58kb)

Title: Dynamics after a sweep through a quantum critical point

Authors: Frank Pollmann, Subroto Mukerjee, Andrew G. Green, Joel E. Moore

Categories: cond-mat.str-el

Comments: 4 pages, 4 figures

\\

The coherent quantum evolution of a one-dimensional many-particle system

after sweeping the Hamiltonian through a critical point is studied using a

generalized quantum Ising model containing both integrable and non-integrable

regimes. It is known from previous work that universal power laws appear in

such quantities as the mean number of excitations created by the sweep. Several

other phenomena are found that are not reflected by such averages: there are

two scaling regimes of the entanglement entropy and a relaxation that is

power-law rather than exponential.% as in the case of a sudden quench. The

final state of evolution after the quench is not well characterized by any

effective temperature, and the Loschmidt echo converges algebraically to a

constant for long times, with cusplike singularities in the integrable case

that are dynamically broadened by nonintegrable perturbations.

\\ ( http://arxiv.org/abs/0907.3206 , 58kb)

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arXiv:0907.3243

Date: Sun, 19 Jul 2009 20:15:46 GMT (9kb)

Title: Exact bosonization for an interacting Fermi gas in arbitrary dimensions

Authors: K.B. Efetov, C. Pepin, H. Meier

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

Comments: 4 pages, no figures

\\

We present an exact mapping of models of interacting fermions onto boson

models. The bosons correspond to collective excitations in the initial

fermionic models. This bosonization is applicable in any dimension and for any

interaction between fermions. We show schematically how the mapping can be used

for Monte Carlo calculations and argue that it should be free from the sign

problem. Introducing superfields we derive a field theory that may serve as a

new way of analytical study.

\\ ( http://arxiv.org/abs/0907.3243 , 9kb)

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arXiv:0907.3365

Date: Mon, 20 Jul 2009 10:18:34 GMT (212kb)

Title: Detection of coherent superpositions of phase states by full counting

statistics in a Bose Josephson junction

Authors: Giulia Ferrini and Anna Minguzzi and Frank W.J.Hekking

Categories: cond-mat.quant-gas

Comments: 4 pages, 3 figures

\\

For a Bose-Josephson junction realized with a double-well potential we

propose a strategy to observe the coherent superpositions of phase states

occurring during the time evolution after a sudden rise of the barrier

separating the two wells. We show that their phase content can be obtained by

the full-counting statistics of the spin-boson operators characterizing the

junction, which could be mapped out by repeated measurements of the population

imbalance after rotation of the state. This measurement can distinguish between

coherent superpositions and incoherent mixtures, and can be used for a

two-dimensional, tomographic reconstruction of the phase content of the state.

\\ ( http://arxiv.org/abs/0907.3365 , 212kb)

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arXiv:0907.3413

Date: Mon, 20 Jul 2009 14:47:13 GMT (91kb)

Title: Parametric amplification of vacuum fluctuations in a spinor condensate

Authors: C. Klempt, O. Topic, G. Gebreyesus, M. Scherer, T. Henninger, P.

Hyllus, W. Ertmer, L. Santos, J.J. Arlt

Categories: cond-mat.quant-gas

Comments: 5 pages, 4 figures

\\

Parametric amplification of vacuum fluctuations is crucial in modern quantum

optics, enabling the creation of squeezing and entanglement. We demonstrate the

parametric amplification of vacuum fluctuations for matter waves using a spinor

F=2 Rb-87 condensate. Interatomic interactions lead to correlated pair creation

in the m_F= ± 1 states from an initial unstable m_F=0 condensate, which acts

as a vacuum for m_F unequal 0. Although this pair creation from a pure m_F=0

condensate is ideally triggered by vacuum fluctuations, unavoidable spurious

initial m_F= ± 1 atoms induce a classical seed which may become the dominant

triggering mechanism. We show that pair creation is insensitive to a classical

seed for sufficiently large magnetic fields, demonstrating the dominant role of

vacuum fluctuations. The presented system thus provides a direct path towards

the generation of non-classical states of matter on the basis of spinor

condensates.

\\ ( http://arxiv.org/abs/0907.3413 , 91kb)

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arXiv:0907.3147

Date: Mon, 20 Jul 2009 10:32:43 GMT (10kb)

Title: Number operator-annihilation operator uncertainty as an alternative of

the number-phase uncertainty relation

Authors: Inigo Urizar Lanz, Geza Toth

Categories: quant-ph

Comments: 3 pages including 1 figure, revtex4

\\

We consider the number operator-annihilation operator uncertainty as a well

behaved alternative of the number-phase uncertainty relation, and examine its

properties. We find a formulation in which the bound on the product of

uncertainties depends on the expectation value of the particle number. Thus,

while the bound is not a constant, it is a quantity that can be easily

controlled and is even conserved in some systems. We propose several setups for

experimental verification.

\\ ( http://arxiv.org/abs/0907.3147 , 10kb)

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arXiv:0907.3213

Date: Sat, 18 Jul 2009 12:01:01 GMT (2224kb)

Title: Measuring atomic NOON-states and using them to make precision

measurements

Authors: David W. Hallwood, Adam Stokes, Jessica J. Cooper and Jacob Dunningham

Categories: quant-ph

Comments: 14 preprint pages, 7 figures

\\

A scheme for creating NOON-states of the quasi-momentum of ultra-cold atoms

has recently been proposed [New J. Phys. 8, 180 (2006)]. This was achieved by

trapping the atoms in an optical lattice in a ring configuration and rotating

the potential at a rate equal to half a quantum of angular momentum . In this

paper we present a scheme for confirming that a NOON-state has indeed been

created. This is achieved by spectroscopically mapping out the anti-crossing

between the ground and first excited levels by modulating the rate at which the

potential is rotated. Finally we show how the NOON-state can be used to make

precision measurements of rotation.

\\ ( http://arxiv.org/abs/0907.3213 , 2224kb)

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arXiv:0907.3498

Date: Tue, 21 Jul 2009 16:00:22 GMT (123kb)

Title: Localization of a Bose-Einstein condensate in a bichromatic optical

lattice

Authors: S. K. Adhikari and L. Salasnich

Categories: cond-mat.quant-gas

Comments: 8 pages

\\

By direct numerical simulation of the time-dependent Gross-Pitaevskii

equation we study different aspects of the localization of a non-interacting

ideal Bose-Einstein condensate (BEC) in a one-dimensional bichromatic

quasi-periodic optical-lattice potential. Such a quasi-periodic potential, used

in a recent experiment on the localization of a BEC [Roati et al., Nature 453,

895 (2008)], can be formed by the superposition of two standing-wave polarized

laser beams with different wavelengths. We investigate the effect of the

variation of optical amplitudes and wavelengths on the localization of a

non-interacting BEC. We also simulate the non-linear dynamics when a

harmonically trapped BEC is suddenly released into a quasi-periodic potential,

{as done experimentally in a laser speckle potential [Billy et al., Nature 453,

891 (2008)]$ We finally study the destruction of the localization in an

interacting BEC due to the repulsion generated by a positive scattering length

between the bosonic atoms.

\\ ( http://arxiv.org/abs/0907.3498 , 123kb)

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arXiv:0907.3507

Date: Mon, 20 Jul 2009 22:29:24 GMT (488kb,D)

Title: Analysis of Kapitza-Dirac diffraction patterns beyond the Raman-Nath

regime

Authors: Bryce Gadway, Daniel Pertot, Rene Reimann, Martin G. Cohen, Dominik

Schneble

Categories: cond-mat.quant-gas

\\

We study Kapitza-Dirac diffraction of a Bose-Einstein condensate from a

standing light wave for a square pulse with variable pulse length but constant

pulse area. We find that for sufficiently weak pulses, the usual analytical

short-pulse prediction for the Raman-Nath regime continues to hold for longer

times, albeit with a reduction of the apparent modulation depth of the standing

wave. We quantitatively relate this effect to the Fourier width of the pulse,

and draw analogies to the Rabi dynamics of a coupled two-state system. Our

findings, combined with numerical modeling for stronger pulses, are of

practical interest for the calibration of optical lattices in ultracold atomic

systems.

\\ ( http://arxiv.org/abs/0907.3507 , 488kb)

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arXiv:0907.3543

Date: Tue, 21 Jul 2009 05:43:40 GMT (32kb)

Title: Supersolidity in a Bose-Holstein model

Authors: Sanjoy Datta and Sudhakar Yarlagadda

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

Report-no: NSF-KITP-09-118

\\

We derive an effective d-dimensional Hamiltonian for a system of

hard-core-bosons coupled to optical phonons in a lattice. At non-half-fillings,

a superfluid-supersolid transition occurs at intermediate boson-phonon

couplings, while at strong-couplings the system phase separates. We demonstrate

explicitly that the presence of next-nearest-neighbor hopping and

nearest-neighbor repulsion leads to supersolidity. Thus we present a

microscopic mechanism for the homogeneous coexistence of charge-density-wave

and superfluid orders.

\\ ( http://arxiv.org/abs/0907.3543 , 32kb)

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arXiv:0907.3612

Date: Tue, 21 Jul 2009 14:35:16 GMT (119kb)

Title: Two-Poton Correlations of Luminescence under Bose-Einstein Condensation

of Dipolar Excitons

Authors: A.V. Gorbunov, V.B. Timofeev, D.A. Demin, A.A. Dremin

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

Comments: 6 pages, 5 figures

Journal-ref: Pis'ma v ZhETF 90 (2009) pp.156-162

\\

Correlations of luminescence intensity have been studied under Bose-Einstein

condensation of dipolar excitons in the temperature range of 0.45-4.2 K.

Photoexcited dipolar excitons were collected in a lateral trap in GaAs/AlGaAs

Schottky-diode heterostructure with single wide (25 nm) quantum well under

applied electric bias. Two-photon correlations were measured with the use of a

classical Hanbury Brown - Twiss intensity interferometer (time resolution ~0.4

ns). Photon "bunching" has been observed near the Bose condensation threshold

of dipolar excitons determined by the appearance of a narrow luminescence line

of exciton condensate at optical pumping increase. The two-photon correlation

function shows super-poissonian distribution at time scales of system coherence

(<~1 ns). No photon bunching was observed at the excitation pumping appreciably

below the condensation threshold. At excitation pumping increasing well above

the threshold, when the narrow line of exciton condensate grows in the

luminescence spectrum, the photon bunching is decreasing and finally vanishes -

the two-photon correlator becomes poissonian reflecting the

single-quantum-state origin of excitonic Bose condensate. Under the same

conditions a first-order spatial correlator, measured by means of the

luminescence interference from spatially separated condensate parts, remains

significant. The discovered photon bunching is rather sensitive to temperature:

it drops several times with temperature increase from 0.45 K up to 4.2 K. If

assumed that the luminescence of dipolar excitons collected in the lateral trap

reflects directly coherent properties of interacting exciton gas, the observed

phenomenon of photon bunching nearby condensation threshold manifests phase

transition in interacting exciton Bose gas.

\\ ( http://arxiv.org/abs/0907.3612 , 119kb)

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\\

arXiv:0907.3659

Date: Tue, 21 Jul 2009 13:51:58 GMT (25kb)

Title: High-momentum tail in the Tonks-Girardeau gas under general confining

potentials

Authors: Gustavo A. Moreno

Categories: cond-mat.quant-gas

\\

We prove that the ground state momentum distribution of a one-dimensional

system of impenetrable bosons exhibits a $k^{-4}$ tail for any confining

potential. We also derive an expression for easily computing the asymptotic

occupation numbers and verify our results with an exact numerical approach.

\\ ( http://arxiv.org/abs/0907.3659 , 25kb)

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\\

arXiv:0907.3663

Date: Tue, 21 Jul 2009 14:04:44 GMT (163kb,D)

Title: Lattice modulation spectroscopy of strongly interacting bosons in

disordered and quasi-periodic optical lattices

Authors: G. Orso, A. Iucci, M. A. Cazalilla and T. Giamarchi

Categories: cond-mat.quant-gas

Comments: 11 pages, 8 figures

\\

We compute the absorption spectrum of strongly repulsive one-dimensional

bosons in a disordered or quasi-periodic optical lattice. At commensurate

filling, the particle-hole resonances of the Mott insulator are broadened as

the disorder strength is increased. In the non-commensurate case, mapping the

problem to the Anderson model allows us to study the Bose-glass phase.

Surprisingly we find that a perturbative treatment in both cases, weak and

strong disorder, gives a good description at all frequencies. In particular we

find that the infrared absorption rate in the thermodynamic limit is quadratic

in frequency. This result is unexpected, since for other quantities like the

conductivity in one dimensional systems, perturbation theory is only applicable

at high frequencies. We discuss applications to recent experiments on optical

lattice systems, and in particular the effect of the harmonic trap.

\\ ( http://arxiv.org/abs/0907.3663 , 163kb)

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\\

arXiv:0907.3725

Date: Tue, 21 Jul 2009 19:22:09 GMT (103kb)

Title: A repulsive atomic gas in a harmonic trap on the border of itinerant

ferromagnetism

Authors: G.J. Conduit, B.D. Simons

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

Comments: 5 pages, 4 figures

\\

Alongside superfluidity, itinerant ferromagnetism remains one of the most

well-characterised strongly correlated phases of fermionic matter. The

transition between ferromagnetism and paramagnetism with increasing temperature

is considered a canonical example of a continuous phase transition, and the

phenomenon has been firmly established in many materials. The ability to tune

the critical temperature through varying pressure presents experimentalists

with an opportunity to investigate novel many-body physics predicted to arise

in the vicinity of a quantum critical point. However, in the majority of

experimental systems, the transition is seen to turn first order at low

temperatures. Whether this phase behaviour derives from soft magnetic

fluctuations, which are believed to drive the Stoner transition first order, or

is a consequence of coupling to auxiliary degrees of freedom such as lattice

vibrations remains a subject of considerable interest and debate. The control

afforded by Feshbach resonance phenomena in ultracold degenerate Fermi gases,

which has been so successful in exploring resonance superfluidity in the regime

of BEC-BCS crossover, presents an opportunity to explore the correlated phase

behaviour predicted by Stoner theory. The aim of this letter is to identify key

experimental signatures of itinerant ferromagnetism in the atomic trap

geometry, and show that these results compare favourably with the findings of a

recent experimental study by Jo et al.

\\ ( http://arxiv.org/abs/0907.3725 , 103kb)

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\\

arXiv:0907.3411

Date: Mon, 20 Jul 2009 14:26:55 GMT (953kb)

Title: Observation of the Anderson Metal-Insulator Transition with Atomic

Matter Waves: Theory and Experiment

Authors: Gabriel Lemari\'e (LKB - Jussieu), Julien Chab\'e (PhLAM, CERLA),

Pascal Szriftgiser (PhLAM, CERLA), Jean-Claude Garreau (PhLAM, CERLA),

Beno\^it Gr\'emaud (LKB - Jussieu), Dominique Delande (LKB - Jussieu)

Categories: quant-ph cond-mat.dis-nn nlin.CD physics.optics

Comments: 19 pages, 15 figures, submitted to PRA

\\

Using a cold atomic gas exposed to laser pulses -- a realization of the

chaotic quasiperiodic kicked rotor with three incommensurate frequencies -- we

study experimentally and theoretically the Anderson metal-insulator transition

in three dimensions. Sensitive measurements of the atomic wavefunction and the

use of finite-size scaling techniques make it possible to unambiguously

demonstrate the existence of a quantum phase transition and to measure its

critical exponents. By taking proper account of systematic corrections to

one-parameter scaling, we show the universality of the critical exponent

$\nu=1.59\pm0.01,$ which is found to be equal to the one previously computed

for the Anderson model.

\\ ( http://arxiv.org/abs/0907.3411 , 953kb)

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\\

arXiv:0907.3731

Date: Tue, 21 Jul 2009 20:00:07 GMT (41kb,D)

Title: Does thermalization occur in an isolated system after a global quantum

quench?

Authors: G. Biroli, C. Kollath, A. Laeuchli

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

Comments: 4 pages, 1 figure

\\

We consider the question of thermalization for isolated quantum systems after

a sudden parameter change, a so-called quantum quench. In particular we

investigate the pre-requisites for thermalization focusing on the statistical

properties of the time-averaged density matrix and of the expectation values of

observables in the final eigenstates. We find that eigenstates, which are rare

compared to the typical ones sampled by the micro-canonical distribution, are

responsible for the absence of thermalization of some infinite integrable

models and play an important role for some finite size non-integrable systems,

such as the Bose-Hubbard model. We stress the importance of finite size effects

for the thermalization of isolated quantum systems and propose a condition,

relying on the Kullback-Leibler entropy, to obtain thermalization.

\\ ( http://arxiv.org/abs/0907.3731 , 41kb)

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\\

arXiv:0907.3814

Date: Wed, 22 Jul 2009 10:56:06 GMT (346kb)

Title: Superfluid Quenching of the Moment of Inertia in a Strongly Interacting

Fermi Gas

Authors: S. Riedl, E. R. Sanchez Guajardo, C. Kohstall, J. Hecker Denschlag, R.

Grimm

Categories: cond-mat.quant-gas

\\

We report on the observation of a quenched moment of inertia as resulting

from superfluidity in a strongly interacting Fermi gas. Our method is based on

setting the hydrodynamic gas in slow rotation and determining its moment of

inertia by detecting the precession of a radial quadrupole excitation. The

measurements distinguish between the superfluid or collisional origin of

hydrodynamic behavior, and show the phase transition.

\\ ( http://arxiv.org/abs/0907.3814 , 346kb)

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\\

arXiv:0907.3899

Date: Wed, 22 Jul 2009 18:16:47 GMT (164kb)

Title: Nonperturbative Thermodynamic Geometry of Anyon Gas

Authors: Behrouz Mirza, Hosein Mohammadzadeh

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

Comments: 20 pages

\\

Following our earlier work on the Ruppeiner geometry of an anyon gas [B.

Mirza and H. Mohammadzadeh, Phys. Rev. E {\bf 78,} 021127 (2008)], we will

derive nonperturbative thermodynamic curvature of a two-dimensional ideal anyon

gas. At different values of the thermodynamic parameter space, some unique and

interesting behaviors of the anyon gas are explored. A complete picture of

attractive and repulsive phases of the anyon gas is given.

\\ ( http://arxiv.org/abs/0907.3899 , 164kb)

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\\

arXiv:0907.3727

Date: Tue, 21 Jul 2009 20:59:02 GMT (123kb,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

\\

Two-photon transitions between atomic states of total electronic angular

momentum $J_a=0$ and $J_b=1$ are forbidden when the photons are of the same

energy. This selection rule is analogous to the Landau-Yang theorem in particle

physics that forbids decays of vector particle into two photons. It arises

because it is impossible to construct a total angular momentum $J_{2\gamma}=1$

quantum-mechanical state of two photons that is permutation symmetric, as

required by Bose-Einstein statistics. In atoms with non-zero nuclear spin, the

selection rule can be violated due to hyperfine interactions. Two distinct

mechanisms responsible for the hyperfine-induced two-photon transitions are

identified, and the hyperfine structure of the induced transitions is

evaluated. The selection rule is also relaxed, even for zero-nuclear-spin

atoms, by application of an external magnetic field. Once again, there are two

similar mechanisms at play: Zeeman splitting of the intermediate-state

sublevels, and off-diagonal mixing of states with different total electronic

angular momentum in the final state. The present theoretical treatment is

relevant to the ongoing experimental search for a possible

Bose-Einstein-statistics violation using two-photon transitions in barium,

where the hyperfine-induced transitions have been recently observed, and the

magnetic-field-induced transitions are being considered both as a possible

systematic effect, and as a way to calibrate the measurement.

\\ ( http://arxiv.org/abs/0907.3727 , 123kb)

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\\

arXiv:0907.3813

Date: Wed, 22 Jul 2009 11:01:00 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

\\

We study the avoided crossings in the dynamics of quantum controlled

excitations for an interacting two-boson system in an optical lattice.

Specifically, we perform numerical simulations of quantum control in this

system where driving pulses connect the undriven stationary states in a manner

characteristic of Stimulated Raman Adiabatic Passage (STIRAP). We demonstrate

that the dynamics of such a transition is affected by chaos induced avoided

crossings, resulting in a loss in coherence of the final outcome in the

adiabatic limit.

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

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\\

arXiv:0907.3971

Date: Thu, 23 Jul 2009 02:35:58 GMT (7kb)

Title: On supersolid fraction

Authors: Yongle Yu

Categories: cond-mat.supr-con

Comments: 1 page, 1 figure

\\

We present an explanation of why the observed supersolid fractions of helium

solids are rather far below unity. One might observe large supersolid fraction

of neon systems immersing in liquid $^3$He. A system of bosonic ions in a ring

trap could display a supersolid fraction close to unity.

\\ ( http://arxiv.org/abs/0907.3971 , 7kb)

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\\

arXiv:0907.3989

Date: Thu, 23 Jul 2009 06:22:14 GMT (2164kb)

Title: Observation of shock waves in a large Bose-Einstein condensate

Authors: R. Meppelink, S. B. Koller, J. M. Vogels, P. van der Straten, E. D.

van Ooijen, N. R. Heckenberg, H. Rubinsztein-Dunlop, S. A. Haine, and M. J.

Davis

Categories: cond-mat.quant-gas

Comments: 7 pages, 7 figures

\\

We observe the formation of shock waves in a Bose-Einstein condensate

containing a large number of sodium atoms. The shock wave is initiated with a

repulsive, blue-detuned light barrier, intersecting the BEC, after which two

shock fronts appear. We observe breaking of these waves when the size of these

waves approaches the healing length of the condensate. At this time, the wave

front splits into two parts and clear fringes appear. The experiment is modeled

using an effective 1D Gross-Pitaevskii-like equation and gives excellent

quantitative agreement with the experiment, even though matter waves with

wavelengths two orders of magnitude smaller than the healing length are

present. In these experiments, no significant heating or particle loss is

observed.

\\ ( http://arxiv.org/abs/0907.3989 , 2164kb)

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The replacements:

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\\

arXiv:0903.2261

replaced with revised version Fri, 17 Jul 2009 14:48:40 GMT (96kb)

Title: Stability of a BEC with Higher-order Interactions near a Feshbach

Resonance

Authors: N.T. Zinner and M. Th{\o}gersen

Categories: cond-mat.other quant-ph

Comments: 4 pages, 3 figures, Revtex4, revised version, changed title

\\ ( http://arxiv.org/abs/0903.2261 , 96kb)

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\\

arXiv:0904.3107 (*cross-listing*)

replaced with revised version Fri, 17 Jul 2009 01:25:01 GMT (462kb)

Title: Nearly Perfect Fluidity: From Cold Atomic Gases to Hot Quark Gluon

Plasmas

Authors: Thomas Schaefer (North Carolina State University), Derek Teaney (SUNY

Stony Brook and Riken-BNL)

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

Comments: 76 pages, 11 figures, review article, extensive revisions

\\ ( http://arxiv.org/abs/0904.3107 , 462kb)

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\\

arXiv:0904.3440

replaced with revised version Fri, 17 Jul 2009 02:41:32 GMT (222kb,D)

Title: Numerical method for evolving the dipolar projected Gross-Pitaevskii

equation

Authors: P. B. Blakie, C. Ticknor, A. S. Bradley, A. M. Martin, M. J. Davis,

and Y. Kawaguchi

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

Comments: 16 pages, 6 figures. Updated to published version

Journal-ref: Phys. Rev. E 80, 016703 (2009)

DOI: 10.1103/PhysRevE.80.016703

\\ ( http://arxiv.org/abs/0904.3440 , 222kb)

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\\

arXiv:0903.2796

replaced with revised version Fri, 17 Jul 2009 01:19:02 GMT (64kb)

Title: Cooling atoms into entangled states

Authors: Giovanni Vacanti and Almut Beige

Categories: quant-ph

Comments: 16 pages, 6 figures, typos corrected

\\ ( http://arxiv.org/abs/0903.2796 , 64kb)

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\\

arXiv:0805.0235

replaced with revised version Sun, 19 Jul 2009 06:29:31 GMT (24kb,D)

Title: Kondo polarons in a one-dimensional Fermi gas

Authors: Austen Lamacraft

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

Comments: Published version

Journal-ref: Phys. Rev. Lett. 101, 225301 (2008)

\\ ( http://arxiv.org/abs/0805.0235 , 24kb)

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\\

arXiv:0810.2696

replaced with revised version Mon, 20 Jul 2009 06:43:11 GMT (296kb)

Title: Statistical mechanics of a Feshbach coupled Bose-Fermi gas in an optical

lattice

Authors: O. Soe Sorensen, N. Nygaard, and P. B. Blakie

Categories: cond-mat.other

Comments: 9 pages, 5 figures

Journal-ref: Phys. Rev. A 79, 053601 (2009)

DOI: 10.1103/PhysRevA.79.053601

\\ ( http://arxiv.org/abs/0810.2696 , 296kb)

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\\

arXiv:0810.4163

replaced with revised version Sun, 19 Jul 2009 08:11:33 GMT (120kb,D)

Title: Dispersion relation and spectral function of an impurity in a

one-dimensional quantum liquid

Authors: Austen Lamacraft

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

Comments: Published version

Journal-ref: Phys. Rev. B 79, 241105(R) (2009)

\\ ( http://arxiv.org/abs/0810.4163 , 120kb)

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\\

arXiv:0901.3625

replaced with revised version Mon, 20 Jul 2009 07:15:49 GMT (1187kb)

Title: Adiabatic cooling of a tunable Bose-Fermi mixture in an optical lattice

Authors: O. Soe Sorensen, N. Nygaard, P. B. Blakie

Categories: cond-mat.other

Comments: 10 pages, 7 figures

Journal-ref: Phys. Rev. A 79, 063615 (2009)

DOI: 10.1103/PhysRevA.79.063615

\\ ( http://arxiv.org/abs/0901.3625 , 1187kb)

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\\

arXiv:0905.0772

replaced with revised version Mon, 20 Jul 2009 17:52:00 GMT (898kb)

Title: Ultracold three-body collisions near overlapping Feshbach resonances

Authors: J. P. D'Incao and B. D. Esry

Categories: physics.atom-ph

Comments: 4 pages, 3 figures, 1 table

\\ ( http://arxiv.org/abs/0905.0772 , 898kb)

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\\

arXiv:0907.2580

replaced with revised version Mon, 20 Jul 2009 15:09:23 GMT (5623kb)

Title: Characterization and limits of a cold atom Sagnac interferometer

Authors: A. Gauguet (SYRTE), Benjamin Canuel (SYRTE), Thomas L\'ev\`eque

(SYRTE), Walid Chaibi (ARTEMIS), Arnaud Landragin (SYRTE)

Categories: physics.atom-ph

\\ ( http://arxiv.org/abs/0907.2580 , 5623kb)

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\\

arXiv:0907.2884

replaced with revised version Mon, 20 Jul 2009 15:43:21 GMT (1601kb,D)

Title: Decoherence via induced dipole collisions in an ultracold gas

Authors: Anthony R. Gorges, Mathew S. Hamilton, and Jacob L. Roberts

Categories: physics.atom-ph

Comments: 4 page, 4 figures

\\ ( http://arxiv.org/abs/0907.2884 , 1601kb)

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\\

arXiv:0804.4631

replaced with revised version Wed, 22 Jul 2009 16:29:24 GMT (43kb)

Title: Andreev reflection in bosonic condensates

Authors: I. Zapata and F. Sols

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

Comments: 5 pages, 3 figures. Text revised

Journal-ref: Phys. Rev. Lett. 102, 180405 (2009)

DOI: 10.1103/PhysRevLett.102.180405

\\ ( http://arxiv.org/abs/0804.4631 , 43kb)

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\\

arXiv:0904.3643

replaced with revised version Wed, 22 Jul 2009 08:57:30 GMT (61kb)

Title: Superfluid to Bose-glass transition in a 1D weakly interacting Bose gas

Authors: Luca Fontanesi, Michiel Wouters, Vincenzo Savona

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

Comments: 4 pages, 4 figures

Journal-ref: Phys. Rev. Lett. 103, 030403 (2009)

DOI: 10.1103/PhysRevLett.103.030403

\\ ( http://arxiv.org/abs/0904.3643 , 61kb)

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\\

arXiv:0906.0714

replaced with revised version Wed, 22 Jul 2009 06:02:06 GMT (2384kb)

Title: Towards a random laser with cold atoms

Authors: William Guerin (INLN), Nicolas Mercadier (INLN), Franck Michaud

(INLN), Davide Brivio (INLN), Luis S. Froufe-P\'erez, R\'emi Carminati (LOA),

Vitalie Eremeev (LPMMC), Arthur Goetschy (LPMMC), Sergey E. Skipetrov

(LPMMC), Robin Kaiser (INLN)

Categories: physics.atom-ph cond-mat.dis-nn physics.optics

Comments: Accepcted for publication by J. Opt. A for the special issue on

nanolasers and random lasers (to be published early 2010)

\\ ( http://arxiv.org/abs/0906.0714 , 2384kb)

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\\

arXiv:0812.4602

replaced with revised version Thu, 23 Jul 2009 13:15:54 GMT (1240kb)

Title: Atomic Quantum Corrals for Bose-Einstein Condensates

Authors: Hongwei Xiong and Biao Wu

Categories: cond-mat.other

Comments: 6 pages, 7 figures

\\ ( http://arxiv.org/abs/0812.4602 , 1240kb)

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\\

arXiv:0903.2263

replaced with revised version Thu, 23 Jul 2009 13:44:35 GMT (851kb)

Title: Shell-Model Monte Carlo Simulations of BCS-BEC Crossover in Few-Fermion

Systems

Authors: N.T. Zinner, K. M{\o}lmer, C. \"Ozen, D.J. Dean, K. Langanke

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

Comments: 6 pages, 5 figures, Revtex4, final version

\\ ( http://arxiv.org/abs/0903.2263 , 851kb)

------------------------------------------------------------------------------

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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