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

Date: Mon, 14 May 2007 09:54:31 +1000 (EST)

Date: Mon, 14 May 2007 09:54:31 +1000 (EST)

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

Another late mailing: 11 new preprints and 17 replacements

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arXiv:0704.3663

Date: Fri, 27 Apr 2007 05:43:00 GMT (315kb)

Title: Optimal conditions for quantum storage on subradiant states in an

extended atomic ensemble

Authors: Alexey Kalachev

Categories: quant-ph

Comments: 6 pages, 3 figures

\\

A scheme for coherent manipulation of collective atomic states is developed

such that total subradiant states, in which spontaneous emission is suppressed

for all spatial modes, can be created in an extended atomic ensemble. The

optimal conditions for quantum-state storage on such states are determined. It

is shown that the optimal shape of a light pulse to be stored and reconstructed

using a homogeneously broadened absorbtion line of an atomic system is the

time-reversed regular part of the response function of the system. In the limit

of high optical density, such pulses allow one to achieve maximum efficiency of

the light state mapping on the atomic system and its subsequent reconstruction.

\\ ( http://arxiv.org/abs/0704.3663 , 315kb)

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arXiv:0704.3774

Date: Sat, 28 Apr 2007 03:31:39 GMT (208kb)

Title: Mott Insulator - Superfluid Transitions in a Two Band Model at Finite

Temperature and Possible Application to Supersolid 4He

Authors: Huai-Bin Zhuang, Michael Ma, Xi Dai, Fu-Chun Zhang

Categories: cond-mat.stat-mech

\\

We study Mott insulator - superfluid transition in a two-band boson Hubbard

model, which can be mapped onto a spin-1/2 XY model with spins coupled to an

additional Ising degree of freedom. By using a modified mean field theory that

include the effects of phase fluctuations, we show that the transition is first

order at both zero and finite temperatures. On the Mott insulator side, there

may be reentrance in phase transition. These features are consequences of the

underlying transition between competing defect poor and defect rich phases. The

relevance of the model and our results to supersolid 4He and cold bosonic atoms

in optical lattices are discussed.

\\ ( http://arxiv.org/abs/0704.3774 , 208kb)

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arXiv:0704.3859

Date: Sun, 29 Apr 2007 20:15:42 GMT (53kb)

Title: Density waves and supersolidity in rapidly rotating atomic Fermi gases

Authors: Gunnar Moller, Nigel R. Cooper

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

Comments: 4 pages, 1 figure, uses feynmp.sty

\\

We study theoretically the low-temperature phases of a two-component atomic

Fermi gas with attractive s-wave interactions under conditions of rapid

rotation. We find that, in the extreme quantum limit, when all particles occupy

the lowest Landau level, the normal state is unstable to the formation of

"charge" density wave (CDW) order. At lower rotation rates, when many Landau

levels are occupied, we show that the low-temperature phases can be

supersolids, involving both CDW and superconducting order.

\\ ( http://arxiv.org/abs/0704.3859 , 53kb)

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arXiv:0704.3867

Date: Mon, 30 Apr 2007 01:14:30 GMT (213kb)

Title: Inhibited Feshbach Conversion of Atomic Fermions to Molecular Bosons due

to Molecular Interaction

Authors: Jie Liu, Li-Bin Fu, Bin Liu, Shi-Ping Yang and Biao Wu

Categories: cond-mat.mes-hall

Comments: 5 pages, 4 figures

\\

We show that the repulsive interaction between molecules can strongly

suppress the Feshbach conversion efficiency from atomic fermions to molecular

bosons, leading to a ceiling phenomenon that has been observed in recent

experiments. Our model predicts a power-law dependence of the remnant fraction

of unconverted atoms on the sweeping rates in the slow sweeping limit. Our

results agrees well with experimental data on $^6$Li and $^{40}$K.

\\ ( http://arxiv.org/abs/0704.3867 , 213kb)

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arXiv:0704.3868

Date: Mon, 30 Apr 2007 02:01:38 GMT (17kb)

Title: Bose-Einstein condensation of strongly interacting dipolar gases

Authors: Daw-Wei Wang

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

Comments: 5 pages and 1 figure

\\

We derive an effective many-body theory for bosonic dipolar atoms/molecules

in the regime of strong dipole interactions, where the conventionally used

first Born approximation for the scattering matrix elements fails to be

justified. We find that the effect of the anisotropic dipole interaction is

strongly reduced near the shape resonance regime and therefore stabilizes the

condensate ground state. In the 2D system with dipole moment perpendicular to

the plane, the Bogoliubov phonon excitation is modified to scale as

$\sqrt{|\bfp|}$ in the low momentum ($\bfp$) limit, showing the same low energy

properties as a 2D charged Bose gas with Coulomb ($1/r$) interactions.

\\ ( http://arxiv.org/abs/0704.3868 , 17kb)

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arXiv:0704.3984

Date: Mon, 30 Apr 2007 17:40:35 GMT (7kb)

Title: Exact renormalisation group flow for ultracold Fermi gases in unitary

limit

Authors: Boris Krippa

Categories: cond-mat.supr-con

Comments: 8 pages, Revtex

\\

We study the exact renormalisation group flow for ultracold Fermi-gases in

unitary regime. We introduce a pairing field to describe the formation of the

Cooper pairs, and take a simple ansatz for the effective action. Set of

approximate flow equations for the effective couplings including boson and

fermionic fluctuations is derived. At some value of the running scale, the

system undergoes a phase transition to a gapped phase. The values of the energy

density, chemical potential, pairing gap and the corresponding proportionality

constants relating the interacting and non-interacting Fermi gases are

calculated. Standard mean field results are recovered if we omit the boson

loops.

\\ ( http://arxiv.org/abs/0704.3984 , 7kb)

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arXiv:0704.3823

Date: Sun, 29 Apr 2007 00:01:43 GMT (645kb)

Title: Effect of Decoherence on the Dynamics of Bose-Einstein Condensates in a

Double-well Potential

Authors: W. Wang, L. B. Fu, and X. X. Yi

Categories: quant-ph

Comments: for color figures, see PRA

Journal-ref: Phys. Rev. A 75,045601(2007)

\\

We study the dynamics of a Bose-Einstein condensate in a double-well

potential in the mean-field approximation. Decoherence effects are considered

by analyzing the couplings of the condensate to environments. Two kinds of

coupling are taken into account. With the first kind of coupling dominated, the

decoherence can enhance the self-trapping by increasing the damping of the

oscillations in the dynamics, while the decoherence from the second kind of

condensate-environment coupling leads to spoiling of the quantum tunneling and

self-trapping.

\\ ( http://arxiv.org/abs/0704.3823 , 645kb)

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arXiv:0704.3926

Date: Mon, 30 Apr 2007 12:23:24 GMT (9kb)

Title: Control of instability of one dimensional stationary state Bose-Einstein

condensates

Authors: Wenhua Hai, Guishu Chong

Categories: quant-ph

Comments: 13 pages

\\

We explore how to control the dynamical instability of a quasi-one

dimensional (1D) stationary state Bose-Einstein condensate (BEC) consisting of

fixed $N$ atoms with arbitrary time-independent external potential and atomic

scattering length. The dependence of the perturbed solutions on the velocity

field, external potential, condensed atom number, and the initial perturbations

is demonstrated analytically, that shows the stability, instability and

undetermined stability of the system. Some sufficient conditions on the

stability and controlling criteria to the instability are established. We take

a BEC held in an optical lattice potential as an example establishing the

stability regions on parameter space and illustrating the scheme for

controlling instability. The results contain the known stability assertions for

the lattice potential case and agree with the recent experimental findings

qualitatively.

\\ ( http://arxiv.org/abs/0704.3926 , 9kb)

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arXiv:0704.3959

Date: Mon, 30 Apr 2007 15:16:47 GMT (799kb)

Title: Optical Devices for Cold Atoms and Bose-Einstein Condensates

Authors: Naceur Gaaloul (PPM, LSAMA), Amine Jaouadi (PPM, LSAMA), Mourad

Telmini (LSAMA), Laurence Pruvost (LAC), Eric Charron (PPM)

Categories: quant-ph

Comments: Proceedings of the International Spectroscopy Conference ISC-2007,

Sousse, Tunisia

Proxy: ccsd hal-00144111

\\

The manipulation of cold atoms with optical fields is a very promising

technique for a variety of applications ranging from laser cooling and trapping

to coherent atom transport and matter wave interferometry. Optical fields have

also been proposed as interesting tools for quantum information processing with

cold atoms. In this paper, we present a theoretical study of the dynamics of a

cold 87Rb atomic cloud falling in the gravity field in the presence of two

crossing dipole guides. The cloud is either deflected or split between the two

branches of this guide. We explore the possibilities of optimization of this

device and present preliminary results obtained in the case of zero-temperature

dilute Bose-Einstein condensates.

\\ ( http://arxiv.org/abs/0704.3959 , 799kb)

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arXiv:0705.0064

Date: Tue, 1 May 2007 03:16:51 GMT (631kb)

Title: Bright solitary waves and trapped solutions in Bose-Einstein condensates

with attractive interactions

Authors: N. G. Parker, S. L. Cornish, C. S. Adams and A. M. Martin

Categories: cond-mat.other

Comments: 18 pages, 8 figures

\\

We analyse the static solutions of attractive Bose-Einstein condensates under

transverse confinement, both with and without axial confinement. By full

numerical solution of the Gross-Pitaevskii equation and variational methods we

map out the condensate solutions, their energetic properties, and their

critical points for instability. With no axial confinement a bright solitary

wave solution will tend to decay by dispersion unless the interaction energy is

close to the critical value for collapse. In contrast, with axial confinement

the only decay mechanism is collapse. The stability of a bright solitary wave

solution increases with higher radial confinement. Finally we consider the

stability of dynamical states containing up to four solitons and find good

agreement with recent experiments.

\\ ( http://arxiv.org/abs/0705.0064 , 631kb)

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arXiv:0705.0097

Date: Tue, 1 May 2007 11:46:07 GMT (36kb)

Title: Collective Oscillations in Trapped Bose-Einstein Condensed Gases in the

Presence of Weak Disorder

Authors: G.M. Falco, A. Pelster, R. Graham

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

Comments: 6 pages, 2 figures

\\

The influence of a weak random potential on the collective modes of a trapped

interacting Bose-Einstein condensate at zero temperature is calculated in the

limit when the correlation length of the disorder is smaller than the healing

length of the superfluid. The problem is solved in the Thomas-Fermi limit by

generalizing the superfluid hydrodynamic equations to allow for the presence of

weak disorder. We find that the disorder-induced frequency-shifts of the

low-energy excitations can be of the same order of magnitude as the beyond

mean-field corrections in the normal interaction recently observed

experimentally.

\\ ( http://arxiv.org/abs/0705.0097 , 36kb)

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arXiv:0705.0058

Date: Tue, 1 May 2007 02:19:10 GMT (121kb)

Title: Exact Floquet states and spatiotemporal vortices of a driven condensate

Authors: Wenhua Hai, Chaohong Lee

Categories: quant-ph

Comments: 7 pages, 2 figures

\\

We investigate the exact Floquet states and spatiotemporal vortices of a

Gross-Pitaevskii equation, which describes an atomic Bose-Einstein condensate

in an optical lattice driven by a spatiotemporal periodic field, and analyze

their instabilities. The exact Floquet states can be prepared by adjusting the

lattice potential and the driving field to obey a balance condition. For small

driving field intensities, which are below a critical value related to the

lattice strength, the Floquet states are spatiotemporal vortices of nontrivial

phase structures and zero-density cores. Due to the velocity singularities of

vortex cores and the blowing-up of perturbations, the spatiotemporal vortices

are unstable. This instability is confirmed by the fast decay of fidelity

between the exact and numerical solutions. The results give a parametric region

of instability and suggest a method for suppressing the instability.

\\ ( http://arxiv.org/abs/0705.0058 , 121kb)

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arXiv:0705.0196

Date: Wed, 2 May 2007 03:01:32 GMT (111kb)

Title: Cranked Hartree-Fock-Bogoliubov Calculation for Rotating Bose-Einstein

Condensates

Authors: Nobukuni Hamamoto, Makito Oi, Naoki Onishi

Categories: cond-mat.other

Comments: accepted to Phys. Rev. A

\\

A rotating bosonic many-body system in a harmonic trap is studied with the

3D-Cranked Hartree-Fock-Bogoliubov method at zero temperature, which has been

applied to nuclear many-body systems at high spin. This method is a variational

method extended from the Hartree-Fock theory, which can treat the pairing

correlations in a self-consistent manner. An advantage of this method is that a

finite-range interaction between constituent particles can be used in the

calculation, unlike the original Gross-Pitaevskii approach. To demonstrate the

validity of our method, we present a calculation for a toy model, that is, a

rotating system of ten bosonic particles interacting through the repulsive

quadrupole-quadrupole interaction in a harmonic trap. It is found that the

yrast states, the lowest-energy states for the given total angular momentum,

does not correspond to the Bose-Einstein condensate, except a few special

cases. One of such cases is a vortex state, which appears when the total

angular momentum $L$ is twice the particle number $N$ (i.e., $L=2N$).

\\ ( http://arxiv.org/abs/0705.0196 , 111kb)

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arXiv:0705.0271

Date: Wed, 2 May 2007 12:52:29 GMT (18kb)

Title: Pairing based cooling of Fermi gases

Authors: M. J. Leskinen, J. Kinnunen, P. Torma

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

Comments: 4 pages, 4 figures

Report-no: NSF-KITP-07-101

\\

We propose a pairing-based method for cooling an atomic Fermi gas. A three

component (labels 1, 2, 3) mixture of Fermions is considered where the

components 1 and 2 interact and, for instance, form pairs whereas the component

3 is in the normal state. For cooling, the components 2 and 3 are coupled by an

electromagnetic field. Since the quasiparticle distributions in the paired and

in the normal states are different, the coupling leads to cooling of the normal

state even when initially $T_{paired}\geq T_{normal}$ (notation $T_S\geq T_N$).

The cooling efficiency is given by the pairing energy and by the linewidth of

the coupling field. No superfluidity is required: any type of pairing, or other

phenomenon that produces a suitable spectral density, is sufficient. In

principle, the paired state could be cooled as well but this requires

$T_N<T_S$. The method has a conceptual analogy to cooling based on

superconductor -- normal metal (SN) tunneling junctions. Main differences arise

from the exact momentum conservation in the case of the field-matter coupling

vs. non-conservation of momentum in the solid state tunneling process.

Moreover, the role of processes that relax the energy conservation requirement

in the tunneling, e.g. thermal fluctuations of an external reservoir, is now

played by the linewidth of the field. The proposed method should be

experimentally feasible due to its close connection to RF-spectroscopy of

ultracold gases which is already in use.

\\ ( http://arxiv.org/abs/0705.0271 , 18kb)

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arXiv:0705.0347

Date: Wed, 2 May 2007 19:23:31 GMT (333kb)

Title: Superfluidity and magnetism in multicomponent ultracold fermions

Authors: R. W. Cherng, Gil Refael, Eugene Demler

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

Comments: 4 pages, 3 figures

\\

We study the interplay between superfluidity and magnetism in a

multicomponent gas of ultracold fermions. Ward-Takahashi identities constrain

possible mean-field states describing order parameters for both pairing and

magnetization. The structure of global phase diagrams arises from competition

among these states as functions of anisotropies in chemical potential, density,

or interactions. They exhibit first and second order phase transition as well

as multicritical points, metastability regions, and phase separation. We

comment on experimental signatures in ultracold atoms.

\\ ( http://arxiv.org/abs/0705.0347 , 333kb)

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arXiv:0705.0322

Date: Wed, 2 May 2007 16:22:23 GMT (68kb,D)

Title: Nonlocality of a single particle

Authors: Jacob Dunningham and Vlatko Vedral

Categories: quant-ph

Comments: 4 pages, 3 figures

\\

There has been a great deal of debate surrounding the issue of whether it is

possible for a single photon to exhibit nonlocality. A number of schemes have

been proposed that claim to demonstrate this effect, but each has been met with

significant opposition. The objections hinge largely on the fact that these

schemes use unobservable initial states and so, it is claimed, they do not

represent experiments that could actually be performed. Here we show how it is

possible to overcome these objections by presenting an experimentally feasible

scheme that uses realistic initial states. Furthermore, all the techniques

required for photons are equally applicable to atoms. It should, therefore,

also be possible to use this scheme to verify the nonlocality of a single

massive particle.

\\ ( http://arxiv.org/abs/0705.0322 , 68kb)

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arXiv:0705.0366

Date: Wed, 2 May 2007 20:29:19 GMT (3kb)

Title: Comment on ``Intensity correlations and mesoscopic fluctuations of

diffusing photons in cold atoms''

Authors: B. Gremaud, D. Delande, C.A. Muller, and C. Miniatura

Categories: cond-mat.mes-hall

Comments: 1 page. Comment submitted to PRL

\\

In a recent Letter (Phys. Rev. Lett. \textbf{98}, 083601 (2007),

arXiv:cond-mat/0610804), O. Assaf and E. Akkermans claim that the angular

correlations of the light intensity scattered by a cloud of cold atoms with

internal degeneracy (Zeeman sublevels) of the ground state overcome the usual

Rayleigh law. More precisely, they found that they become exponentially large

with the size of the sample. In what follows, we will explain why their results

are wrong and, in contrary, why the internal degeneracy leads to lower

intensity correlations.

\\ ( http://arxiv.org/abs/0705.0366 , 3kb)

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The replacements:

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arXiv:cond-mat/0609472

replaced with revised version Fri, 27 Apr 2007 14:59:29 GMT (548kb,D)

Title: Quantum Hall-like effect for cold atoms in non-Abelian gauge potentials

Authors: N. Goldman and P. Gaspard

Categories: cond-mat.mes-hall

Comments: 6 pages, 2 figures

\\ ( http://arxiv.org/abs/cond-mat/0609472 , 548kb)

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arXiv:cond-mat/0510111

replaced with revised version Mon, 30 Apr 2007 10:22:44 GMT (16kb)

Title: Particle correlations in a fermi superfluid

Authors: Austen Lamacraft

Categories: cond-mat.stat-mech

Comments: Published version

Journal-ref: Phys. Rev. A 73, 011602(R) (2006)

\\ ( http://arxiv.org/abs/cond-mat/0510111 , 16kb)

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arXiv:cond-mat/0609240

replaced with revised version Mon, 30 Apr 2007 15:18:30 GMT (398kb)

Title: Normal-Superfluid Interface Scattering For Polarized Fermion Gases

Authors: Bert Van Schaeybroeck and Achilleas Lazarides

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

Comments: 4 pages, 3 figures

Journal-ref: Phys. Rev. Lett. 98, 170402 (2007)

DOI: 10.1103/PhysRevLett.98.170402

\\ ( http://arxiv.org/abs/cond-mat/0609240 , 398kb)

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arXiv:cond-mat/0610389

replaced with revised version Mon, 30 Apr 2007 06:33:05 GMT (85kb)

Title: Ultracold Bose Gases in 1D Random Potentials: From Lifshits Glasses to

Bose-Einstein Condensates

Authors: Pierre Lugan (LCFIO), David Cl\'ement (LCFIO), Philippe Bouyer

(LCFIO), Alain Aspect (LCFIO), Maciej Lewenstein (ICFO), Laurent

Sanchez-Palencia (LCFIO)

Categories: cond-mat.other

Comments: published version

Journal-ref: Physical Review Letters 98 (2007) 170403

DOI: 10.1103/PhysRevLett.98.170403

\\ ( http://arxiv.org/abs/cond-mat/0610389 , 85kb)

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arXiv:cond-mat/0611017

replaced with revised version Mon, 30 Apr 2007 10:02:42 GMT (505kb)

Title: Quantum quenches in a spinor condensate

Authors: Austen Lamacraft

Categories: cond-mat.stat-mech

Comments: Published version

Journal-ref: Phys. Rev. Lett. 98, 160404 (2007)

\\ ( http://arxiv.org/abs/cond-mat/0611017 , 505kb)

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arXiv:cond-mat/0611206

replaced with revised version Mon, 30 Apr 2007 08:59:20 GMT (812kb)

Title: Measuring the one-particle excitations of ultracold fermionic atoms by

stimulated Raman spectroscopy

Authors: Tung-Lam Dao, Antoine Georges, Jean Dalibard, Christophe Salomon,

Iacopo Carusotto

Categories: cond-mat.other

Comments: 5 pages, 3 figures, accepted for publication at Phys. Rev. Letters

\\ ( http://arxiv.org/abs/cond-mat/0611206 , 812kb)

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arXiv:cond-mat/0701668

replaced with revised version Sat, 28 Apr 2007 09:15:33 GMT (22kb)

Title: Bose-Einstein Condensate in a Harmonic Trap Decorated with Dirac Delta

Functions

Authors: Haydar Uncu, Devrim Tarhan, Ersan Demiralp, Ozgur E. Mustecaplioglu

Categories: cond-mat.other quant-ph

Comments: 8 pages, 8 figures

\\ ( http://arxiv.org/abs/cond-mat/0701668 , 22kb)

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arXiv:cond-mat/0605744

replaced with revised version Wed, 2 May 2007 07:00:09 GMT (63kb)

Title: Finite temperature phase diagram of a polarised Fermi condensate

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

Categories: cond-mat.other

Comments: 6 pages, 4 figures. Manuscript extended and figures modified. For

final version, see Nature Physics

Journal-ref: Nature Physics 3, 124 (2007)

\\ ( http://arxiv.org/abs/cond-mat/0605744 , 63kb)

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arXiv:cond-mat/0608651

replaced with revised version Wed, 2 May 2007 06:48:55 GMT (84kb)

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

point

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

Categories: cond-mat.other

Comments: 5 pages, 5 figures

Journal-ref: Phys. Rev. Lett. 98 (2007) 160402

\\ ( http://arxiv.org/abs/cond-mat/0608651 , 84kb)

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arXiv:cond-mat/0610389

replaced with revised version Wed, 2 May 2007 07:08:17 GMT (85kb)

Title: Ultracold Bose Gases in 1D Disorder: From Lifshits Glass to

Bose-Einstein Condensate

Authors: Pierre Lugan (LCFIO), David Cl\'ement (LCFIO), Philippe Bouyer

(LCFIO), Alain Aspect (LCFIO), Maciej Lewenstein (ICFO), Laurent

Sanchez-Palencia (LCFIO)

Categories: cond-mat.other

Comments: published version

Journal-ref: Physical Review Letters 98 (2007) 170403

DOI: 10.1103/PhysRevLett.98.170403

\\ ( http://arxiv.org/abs/cond-mat/0610389 , 85kb)

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arXiv:cond-mat/0612565

replaced with revised version Wed, 2 May 2007 13:10:44 GMT (162kb)

Title: Novel quantum phases of dipolar Bose gases in optical lattices

Authors: S. Yi, T. Li, C. P. Sun

Categories: cond-mat.other

Comments: 4 pages, 4 figures

\\ ( http://arxiv.org/abs/cond-mat/0612565 , 162kb)

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Till next time (which should only be a few minutes),

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/ ========================================================================= 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 =========================================================================Received on Mon May 14 2007 - 09:54:31 EST

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