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

Date: Mon, 4 Sep 2006 10:38:59 +1000 (EST)

Date: Mon, 4 Sep 2006 10:38:59 +1000 (EST)

The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>

Hi all,

Back on track this week with the abstracts.

Home page: http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/

The abstracts:

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Paper: cond-mat/0608611

Date: Mon, 28 Aug 2006 20:00:32 GMT (47kb)

Title: Excited state spectra at the superfluid-insulator transition out of

paired condensates

Authors: Stephen Powell and Subir Sachdev

Comments: 4 pages, 1 figure

Subj-class: Strongly Correlated Electrons; Superconductivity

\\

We describe gapped single-particle and collective excitations across a

superfluid to insulator quantum phase transition of particles (bosons or

fermions) in a periodic potential, with an even number of particles per unit

cell. We demonstrate that the dynamics is controlled by a quantum impurity

problem of a localized particle interacting with the bulk critical modes.

Critical exponents are determined by a renormalization group analysis. We

discuss applications to spin oscillations of ultracold atoms in optical

lattices, and to the electronic phases in the cuprate and related compounds.

\\ ( http://arXiv.org/abs/cond-mat/0608611 , 47kb)

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Paper: cond-mat/0608624

Date: Tue, 29 Aug 2006 07:06:26 GMT (197kb)

Title: Fermionization and fractional statistics in the strongly interacting

one-dimensional Bose gas

Authors: M.T. Batchelor and X.-W. Guan

Comments: 7 pages, 4 figures

Subj-class: Statistical Mechanics; Strongly Correlated Electrons

\\

We discuss recent results on the relation between the strongly interacting

one-dimensional Bose gas and a gas of ideal particles obeying nonmutual

generalized exclusion statistics (GES). The thermodynamic properties considered

include the statistical profiles, the specific heat and local pair

correlations. In the strong coupling limit $\gamma \to \infty$, the

Tonks-Girardeau gas, the equivalence is with Fermi statistics. The deviation

from Fermi statistics during boson fermionization for finite but large

interaction strength $\gamma$ is described by the relation $\alpha \approx 1 -

2/\gamma$, where $\alpha$ is a measure of the GES. This gives a quantitative

description of the fermionization process. In this sense the recent

experimental measurement of local pair correlations in a 1D Bose gas of

$^{87}$Rb atoms also provides a measure of the deviation of the GES parameter

$\alpha$ away from the pure Fermi statistics value $\alpha=1$. Other

thermodynamic properties, such as the distribution profiles and the specific

heat, are also sensitive to the statistics. They also thus provide a way of

exploring fractional statistics in the strongly interacting 1D Bose gas.

\\ ( http://arXiv.org/abs/cond-mat/0608624 , 197kb)

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Paper: cond-mat/0608634

Date: Tue, 29 Aug 2006 13:52:37 GMT (403kb)

Title: Quantum dynamics in splitting a harmonically trapped Bose-Einstein

condensate by an optical lattice: Truncated Wigner approximation

Authors: L. Isella, J. Ruostekoski

Comments: 17 pages

Subj-class: Other

\\

We study the splitting of a harmonically trapped atomic Bose-Einstein

condensate when we continuously turn up an optical lattice (or a double-well)

potential. As the lattice height is increased, quantum fluctuations of atoms

are enhanced. The resulting nonequilibrium dynamics of the fragmentation

process of the condensate, the loss of the phase coherence of atoms along the

lattice, and the reduced atom number fluctuations in individual lattice sites

are stochastically studied within the truncated Wigner approximation. We

perform a detailed study of the effects of temperature and lattice height on

atom dynamics, and investigate the validity of the classical Gross-Pitaevskii

equation in optical lattices. We find the atom number squeezing to saturate in

deep lattices due to nonadiabaticity in turning up of the lattice potential

that is challenging to avoid in experiments when the occupation number of the

lattice sites is large, making it difficult to produce strongly number squeezed

(or the Mott insulator) states with large filling factors. We also investigate

some general numerical properties of the truncated Wigner approximation.

\\ ( http://arXiv.org/abs/cond-mat/0608634 , 403kb)

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Paper: cond-mat/0608639

Date: Tue, 29 Aug 2006 16:00:28 GMT (695kb)

Title: Correlations in Ultracold Trapped Few-Boson Systems: Transition from

Condensation to Fermionization

Authors: Sascha Z\"ollner, Hans-Dieter Meyer and Peter Schmelcher

Comments: 22 pages, 7 figures

Subj-class: Other

\\

We study the correlation properties of the ground states of few ultracold

bosons, trapped in double wells of varying barrier height in one dimension.

Extending previous results on the signature of the transition from a

Bose-condensed state via fragmentation to the hard-core limit, we provide a

deeper understanding of that transition by relating it to the loss of coherence

in the one-body density matrix and to the emerging long-range tail in the

momentum spectrum. These are accounted for in detail by discussing the natural

orbitals and their occupations. Our discussion is complemented by an analysis

of the two-body correlation function.

\\ ( http://arXiv.org/abs/cond-mat/0608639 , 695kb)

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Paper: cond-mat/0606117

replaced with revised version Tue, 29 Aug 2006 06:32:06 GMT (13kb)

Title: Fermions at unitarity and Haldane Exclusion Statistics

Authors: R.K. Bhaduri, M.V.N. Murthy and M.K. Srivastava

Comments: 4 pages, 1 postscript figure

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0606117 , 13kb)

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Paper: physics/0604008

replaced with revised version Tue, 29 Aug 2006 12:44:00 GMT (359kb)

Title: Anomalous translational velocity of vortex ring with finite-amplitude

Kelvin waves

Authors: C.F. Barenghi, R. Hanninen, M. Tsubota

Comments: 6 pages, 5 figures, v2: minor changes

Subj-class: Fluid Dynamics; Soft Condensed Matter

\\ ( http://arXiv.org/abs/physics/0604008 , 359kb)

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Paper: quant-ph/0608222

Date: Mon, 28 Aug 2006 23:22:00 GMT (775kb)

Title: Quantum dynamics of bosons in a double-well potential: Josephson

oscillations, self-trapping and ultralong tunneling times

Authors: A. N. Salgueiro, A. F. R. de Toledo Piza, G. B. Lemos, R. Drumond, M.

C. Nemes and M. Weidemueller

\\

The dynamics of the population imbalance of bosons in a double-well potential

is investigated from the point of view of many-body quantum mechanics in the

framework of the two-mode model. For small initial population imbalances,

coherent superpositions of almost equally spaced energy eigenstates lead to

Josephson oscillations. The suppression of tunneling at population imbalance

beyond a critical value is related to a high concentration of initial state

population in the region of the energy spectrum with quasi-degenerate doublets

resulting in imbalance oscillations with a very small amplitude. For

unaccessible long times, however, the system recovers the regime of Josephson

oscillations.

\\ ( http://arXiv.org/abs/quant-ph/0608222 , 775kb)

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Paper: quant-ph/0608228

Date: Tue, 29 Aug 2006 08:25:45 GMT (492kb)

Title: Radio-frequency dressed state potentials for neutral atoms

Authors: S. Hofferberth, I. Lesanovsky, B. Fischer, J. Verdu, J. Schmiedmayer

\\

Potentials for atoms can be created by external fields acting on properties

like magnetic moment, charge, polarizability, or by oscillating fields which

couple internal states. The most prominent realization of the latter is the

optical dipole potential formed by coupling ground and electronically excited

states of an atom with light. Here we present an experimental investigation of

the remarkable properties of potentials derived from radio-frequency (RF)

coupling between electronic ground states. The coupling is magnetic and the

vector character allows to design state dependent potential landscapes. On atom

chips this enables robust coherent atom manipulation on much smaller spatial

scales than possible with static fields alone. We find no additional heating or

collisional loss up to densities approaching $10^{15}$ atoms / cm$^3$ compared

to static magnetic traps. We demonstrate the creation of Bose-Einstein

condensates in RF potentials and investigate the difference in the interference

between two independently created and two coherently split condensates in

identical traps. All together this makes RF dressing a powerful new tool for

micro manipulation of atomic and molecular systems.

\\ ( http://arXiv.org/abs/quant-ph/0608228 , 492kb)

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Paper: quant-ph/0604158

replaced with revised version Mon, 28 Aug 2006 21:13:18 GMT (852kb)

Title: Semiclassical approach to Bose-Einstein condensates in a triple well

potential

Authors: S. Mossmann, C. Jung

Comments: 15 pages, 15 figures

\\ ( http://arXiv.org/abs/quant-ph/0604158 , 852kb)

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Paper: cond-mat/0608651

Date: Wed, 30 Aug 2006 00:15:11 GMT (83kb)

Title: Polarized Fermi condensates with unequal masses: Tuning the tricritical

point

Authors: M. M. Parish, F. M. Marchetti, A. Lamacraft, B. D. Simons

Comments: 5 pages, 5 figures

Subj-class: Other

\\

We consider a two-component atomic Fermi gas within a mean-field,

single-channel model, where both the mass and population of each component are

unequal. We show that the tricritical point at zero temperature evolves

smoothly from the BEC- to BCS-side of the resonance as a function of mass ratio

r. We find that the interior gap state proposed by Liu and Wilczek is always

unstable to phase separation, while the breached pair state with one Fermi

surface for the excess fermions exhibits differences in its DoSs and pair

correlation functions depending on which side of the resonance it lies.

Finally, we show that, when r > 3.95, the finite temperature phase diagram of

trapped gases at unitarity becomes topologically distinct from the equal mass

system.

\\ ( http://arXiv.org/abs/cond-mat/0608651 , 83kb)

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Paper: cond-mat/0608656

Date: Wed, 30 Aug 2006 03:39:41 GMT (304kb)

Title: Dynamical vortex phases in a Bose-Einstein condensate driven by a

rotating optical lattice

Authors: Kenichi Kasamatsu, Makoto Tsubota

Comments: 4 pages, 3 figures

Subj-class: Other

\\

We present simulation results of the vortex dynamics in a trapped

Bose-Einstein condensate in the presence of a rotating optical lattice.

Changing the potential amplitude and the relative rotation frequency between

the condensate and the optical lattice, we find a rich variety of dynamical

phases of vortices. The onset of these different phases is described by the

force balance of a driving force, a pinning force and vortex-vortex

interactions. In particular, when the optical lattice rotates faster than the

condensate, an incommensurate effect leads to a vortex liquid phase supported

by the competition between the driving force and the dissipation.

\\ ( http://arXiv.org/abs/cond-mat/0608656 , 304kb)

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Paper: cond-mat/0608662

Date: Wed, 30 Aug 2006 19:54:04 GMT (50kb)

Title: Theory of Superfluids with Population Imbalance: Finite Temperature and

BCS-BEC Crossover Effects

Authors: Qijin Chen, Yan He, Chih-Chun Chien and K. Levin

Comments: 15 pages, 5 figures

Subj-class: Strongly Correlated Electrons; Superconductivity

\\

In this paper we present a very general theoretical framework for addressing

fermionic superfluids over the entire range of BCS to Bose Einstein

condensation (BEC) crossover in the presence of population imbalance or spin

polarization. Our emphasis is on providing a theory which reduces to the

standard zero temperature mean field theories in the literature, but

necessarily includes pairing fluctuation effects at non-zero temperature within

a consistent framework. Physically, these effects are associated with the

presence of pre-formed pairs (or a fermionic pseudogap) in the normal phase,

and pair excitations of the condensate, in the superfluid phase. We show how

this finite $T$ theory of fermionic pair condensates bears many similarities to

the condensation of point bosons. In the process we examine three different

types of condensate: the usual breached pair or Sarma phase and both the one

and two plane wave Larkin- Ovchinnikov, Fulde-Ferrell (LOFF) states. The last

of these has been discussed in the literature albeit only within a

Landau-Ginzburg formalism, generally valid near $T_c$. Here we show how to

arrive at the two plane wave LOFF state in the ground state as well as at

general temperature $T$.

\\ ( http://arXiv.org/abs/cond-mat/0608662 , 50kb)

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Paper: cond-mat/0608673

Date: Wed, 30 Aug 2006 14:32:57 GMT (336kb)

Title: Spin-quadrupole ordering of spin-3/2 ultracold fermionic atoms in

optical lattices studied with one-band Hubbard model

Authors: Hong-Hao Tu, Guang-Ming Zhang, Lu Yu

Comments: 11 pages, Revtex, 4 figures

Subj-class: Strongly Correlated Electrons

\\

Based on a generalized one-band Hubbard model, we study magnetic properties

of Mott insulating states for ultracold spin-3/2 fermionic atoms in optical

lattices. When the s-wave scattering lengths for the total spin $S=2,0$ satisfy

conditions $a_{2}>a_{0}>0$, we apply a functional integral approach to the

half-filled case, where the spin-quadrupole fluctuations dominate. On a 2D

square lattice, the saddle point solution yields a staggered spin-quadrupole

ordering at zero temperature. Both spin and spin-quadrupole static structure

factors are calculated, displaying highly anisotropic spin antiferromagnetic

fluctuations and antiferro-quadrupole long-range order, respectively. When the

Gaussian fluctuations around the saddle point are taken into account, a linear

dispersion of the spin-quadrupole density waves is derived. The corresponding

velocity and stiffness are evaluated and compared with the spin density waves

present in the half-filled spin-1/2 Hubbard model. Finally, in the strong

coupling limit of the model Hamiltonian, we derive the effective hyperfine spin

exchange interactions for the Mott insulating phases in the quarter-filled and

half-filled cases, respectively.

\\ ( http://arXiv.org/abs/cond-mat/0608673 , 336kb)

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Paper: cond-mat/0608689

Date: Wed, 30 Aug 2006 19:52:14 GMT (59kb)

Title: BEC-BCS crossover of a trapped Fermi gas beyond the local density

approximation

Authors: R. Jauregui, R. Paredes, and G. Toledo Sanchez

Comments: 10 pages, 3 figures, 1 table

Subj-class: Other

\\

We perform a Variational Quantum Monte Carlo simulation of an interacting

Fermi gas confined in a three dimensional harmonic potential. This gas is

considered as the precursor system from which a molecular bosonic gas is

formed. Based in the results of two-body calculations for trapped atoms, we

propose a family of variational many-body wave functions that takes into

account the qualitative different nature of the BCS and BEC regimes as a

function of the scattering length. Energies, densities and correlations

functions are calculated and compared with previous results for homogeneous

gases. Universality tests at the unitarity limit are also performed.

\\ ( http://arXiv.org/abs/cond-mat/0608689 , 59kb)

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Paper: quant-ph/0608234

Date: Wed, 30 Aug 2006 00:48:49 GMT (604kb)

Title: Controlled polarization rotation of an optical field in

multi-Zeeman-sublevel atoms

Authors: Shujing Li, Bo Wang, Xudong Yang, Yanxu Han, Hai Wang, Min Xiao, K.C.

Peng

Comments: 28pages, 12figures

\\

We investigate, both theoretically and experimentally, the phenomenon of

polarization rotation of a weak, linearly-polarized optical (probe) field in an

atomic system with multiple three-level electromagnetically induced

transparency (EIT) sub-systems. The polarization rotation angle can be

controlled by a circularly-polarized coupling beam, which breaks the symmetry

in number of EIT subsystems seen by the left- and right-circularly-polarized

components of the weak probe beam. A large polarization rotation angle (up to

45 degrees) has been achieved with a coupling beam power of only 15 mW.

Detailed theoretical analyses including different transition probabilities in

different transitions and Doppler-broadening are presented and the results are

in good agreements with the experimentally measured results.

\\ ( http://arXiv.org/abs/quant-ph/0608234 , 604kb)

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Paper: quant-ph/0608242

Date: Wed, 30 Aug 2006 14:49:08 GMT (456kb)

Title: Creation of macroscopic superposition states from arrays of

Bose-Einstein condensates

Authors: J.A. Dunningham, K. Burnett, R. Roth, and W.D. Phillips

Comments: 7 pages, 5 figures

DOI: 10.1088/1367-2630/8/5/000

\\

We consider how macroscopic quantum superpositions may be created from arrays

of Bose-Einstein condensates. We study a system of three condensates in Fock

states, all with the same number of atoms and show that this has the form of a

highly entangled superposition of different quasi-momenta. We then show how, by

partially releasing these condensates and detecting an interference pattern

where they overlap, it is possible to create a macroscopic superposition of

different relative phases for the remaining portions of the condensates. We

discuss methods for confirming these superpositions.

\\ ( http://arXiv.org/abs/quant-ph/0608242 , 456kb)

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Paper: quant-ph/0605252

replaced with revised version Tue, 29 Aug 2006 22:38:09 GMT (621kb)

Title: Photoassociation adiabatic passage of ultracold Rb atoms to form

ultracold Rb_2 molecules

Authors: Evgeny A. Shapiro, Moshe Shapiro, Avi Pe'er, and Jun Ye

Comments: RevTex, 23 pages, 9 figures

\\ ( http://arXiv.org/abs/quant-ph/0605252 , 621kb)

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Paper: cond-mat/0608690

Date: Wed, 30 Aug 2006 23:10:05 GMT (90kb)

Title: Hidden symmetry and quantum phases in spin-3/2 cold atomic systems

Authors: Congjun Wu

Subj-class: Strongly Correlated Electrons

\\

Optical traps and lattices provide a new opportunity to study strongly

correlated high spin systems with cold atoms. In this article, we review the

recent progress on the hidden symmetry properties in the simplest high spin

fermionic systems with hyperfine spin $F=3/2$, which may be realized with atoms

of $^{132}$Cs, $^9$Be, $^{135}$Ba, $^{137}$Ba, and $^{201}$Hg. A {\it generic}

SO(5) or isomorphically, $Sp(4)$) symmetry is proved in such systems with the

s-wave scattering interactions in optical traps, or with the on-site Hubbard

interactions in optical lattices. Various important features from this high

symmetry are studied in the Fermi liquid theory, the mean field phase diagram,

and the sign problem in quantum Monte-Carlo simulations. In the s-wave quintet

Cooper pairing phase, the half-quantum vortex exhibits the global analogue of

the Alice string and non-Abelian Cheshire charge properties in gauge theories.

The existence of the quartetting phase, a four-fermion counterpart of the

Cooper pairing phase, and its competition with other orders are studied in one

dimensional spin-3/2 systems. We also show that counter-intuitively quantum

fluctuations in spin-3/2 magnetic systems are even stronger than those in

spin-1/2 systems.

\\ ( http://arXiv.org/abs/cond-mat/0608690 , 90kb)

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Paper: cond-mat/0608710

Date: Thu, 31 Aug 2006 09:33:30 GMT (194kb)

Title: A moving magnetic mirror to slow down a bunch of atoms

Authors: Ga\"{e}l Reinaudi (LKB - Lhomond), Zhaoying Wang (LKB - Lhomond),

Antoine Couvert (LKB - Lhomond), Thierry Lahaye (LKB - Lhomond), David

Gu\'{e}ry-Odelin (LKB - Lhomond)

Proxy: ccsd ccsd-00090483

Subj-class: Other

\\

A fast packet of cold atoms is coupled into a magnetic guide and subsequently

slowed down by reflection on a magnetic potential barrier ('mirror') moving

along the guide. A detailed characterization of the resulting decelerated

packet is performed. We show also how this technique can be used to generate a

continuous and intense flux of slow, magnetically guided atoms.

\\ ( http://arXiv.org/abs/cond-mat/0608710 , 194kb)

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Paper: cond-mat/0608721

Date: Thu, 31 Aug 2006 14:58:30 GMT (135kb)

Title: Repulsively bound atom pairs: Overview, Simulations and Links

Authors: A. J. Daley, A. Kantian, H. P. Buechler, P. Zoller, K. Winkler, G.

Thalhammer, F. Lang, R. Grimm, J. Hecker Denschlag

Comments: 7 pages, 3 figures, Proceedings of ICAP-2006 (Innsbruck)

Subj-class: Other

\\

We review the basic physics of repulsively bound atom pairs in an optical

lattice, which were recently observed in the laboratory, including the theory

and the experimental implementation. We also briefly discuss related many-body

numerical simulations, in which time-dependent Density Matrix Renormalisation

Group (DMRG) methods are used to model the many-body physics of a collection of

interacting pairs, and give a comparison of the single-particle quasimomentum

distribution measured in the experiment and results from these simulations. We

then give a short discussion of how these repulsively bound pairs relate to

bound states in some other physical systems.

\\ ( http://arXiv.org/abs/cond-mat/0608721 , 135kb)

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Paper: cond-mat/0608732

Date: Thu, 31 Aug 2006 16:56:04 GMT (614kb)

Title: Quantum Spin Dynamics of Spin-1 Bose Gas

Authors: Roberto B. Diener and Tin-Lun Ho

Comments: 4 pages, 2 figures

Subj-class: Other

\\

We show that the quantum evolution of a spin-1 Bose gas with nearly all

bosons initially in the $F_z = 0$ state has a "quantum carpet" {\em spin-time}

structure with self-similar properties. The system continuously evolves into

"multi-peaked" Schr\"odinger cat like states, returning occasionally to

coherent structures, which leads to large number fluctuations (as seen in

recent experiments). The self similar behavior allows one to reveal the quantum

evolution as a set of peaks in the number probability distribution of a spin

component at times {\em much shorter} than the quantum revival time. We also

show that these features survive small number fluctuations among spin

components up to a few percent.

\\ ( http://arXiv.org/abs/cond-mat/0608732 , 614kb)

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Paper: cond-mat/0606015

replaced with revised version Thu, 31 Aug 2006 08:05:24 GMT (360kb)

Title: Experimental study of the transport of coherent interacting matter-waves

in a 1D random potential induced by laser speckle

Authors: David Cl\'{e}ment (LCFIO), Andr\`{e}s F. Var\`{o}n (LCFIO), Jocelyn A.

Retter (LCFIO), Laurent Sanchez-Palencia (LCFIO), Alain Aspect (LCFIO),

Philippe Bouyer (LCFIO)

Proxy: ccsd ccsd-00077779

Subj-class: Other

Journal-ref: New Journal of Physics 8 (2006) 165

DOI: 10.1088/1367-2630/8/8/165

\\ ( http://arXiv.org/abs/cond-mat/0606015 , 360kb)

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Paper: cond-mat/0607045

replaced with revised version Thu, 31 Aug 2006 12:14:36 GMT (66kb)

Title: Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover

Authors: M. W. J. Romans and H. T. C. Stoof

Comments: 13 pages of RevTex and 12 Figures. Submitted for publication in

Physical review A

Subj-class: Statistical Mechanics; Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0607045 , 66kb)

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Paper: cond-mat/0608455

replaced with revised version Wed, 30 Aug 2006 20:33:29 GMT (824kb)

Title: Deformation of a Trapped Fermi Gas with Unequal Spin Populations

Authors: G. B. Partridge, Wenhui Li, Y. A. Liao, R. G. Hulet, M. Haque & H. T.

C. Stoof

Subj-class: Other; Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0608455 , 824kb)

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Paper: quant-ph/0608247

Date: Thu, 31 Aug 2006 06:36:46 GMT (355kb)

Title: Quantum many-body simulations using Gaussian phase-space representations

Authors: P. D. Drummond, P. Deuar, J. F. Corney

Comments: Short Review (10 pages)

\\

Phase-space representations are of increasing importance as a viable and

successful means to study exponentially complex quantum many-body systems from

first principles. This review traces the background of these methods, starting

from the early work of Wigner, Glauber and Sudarshan. We focus on modern

phase-space approaches using non-classical phase-space representations. These

lead to the Gaussian representation, which unifies bosonic and fermionic

phase-space. Examples treated include quantum solitons in optical fibers,

colliding Bose-Einstein condensates, and strongly correlated fermions on

lattices.

\\ ( http://arXiv.org/abs/quant-ph/0608247 , 355kb)

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Paper: quant-ph/0511232

replaced with revised version Thu, 31 Aug 2006 11:37:48 GMT (122kb)

Title: Analysis of a single-atom dipole trap

Authors: Markus Weber, Juergen Volz, Karen Saucke, Christian Kurtsiefer, and

Harald Weinfurter

Comments: Version 2; formula in equ. 3 corrected

Journal-ref: Phys. Rev. A 73, 043406 (2006)

\\ ( http://arXiv.org/abs/quant-ph/0511232 , 122kb)

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Till next week,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Mon Sep 04 2006 - 10:38:59 EST

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