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

Date: Fri, 2 Feb 2007 05:24:32 +1000 (EST)

Date: Fri, 2 Feb 2007 05:24:32 +1000 (EST)

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

Hi all,

The first email bringing you up to date. A massive 40 new preprints:

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Paper: cond-mat/0701270

Date: Fri, 12 Jan 2007 11:27:08 GMT (464kb)

Title: Vortex-antivortex tunneling and the limitations of mean-field theory

Authors: Gentaro Watanabe, C. J. Pethick

Categories: cond-mat.mes-hall

Comments: 5 pages, 5 figures

Report-no: NORDITA-2007-3

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We study the quantum dynamics of a model for a vortex in a Bose gas with

repulsive interactions in an anisotropic, harmonic trap previously studied in

mean-field theory by Garc\'ia-Ripoll {\it et al.}, [Phys. Rev. Lett. {\bf 87},

140403 (2001)]. For low excitation energy of the vortex, we show that the

circulation of the vortex undergoes periodic reversals by quantum-mechanical

tunneling, in addition to the oscillations predicted in mean-field theory for

higher excitation energies. With increasing interaction strength or particle

number, vortices become increasingly stable, and the period for reversals by

tunneling increases. Tunneling between vortex and antivortex states is shown to

be described to a good approximation by a Schr\"odinger cat state that is a

superposition of vortex and antivortex states, rather than the mean-field

state, and we derive analytical expression for the oscillation period.

\\ ( http://arXiv.org/abs/cond-mat/0701270 , 464kb)

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Paper: cond-mat/0701272

Date: Fri, 12 Jan 2007 12:57:32 GMT (65kb)

Title: Imbalanced Fermi superfluid in a one-dimensional optical potential

Authors: J. Tempere, M. Wouters, J.T. Devreese

Categories: cond-mat.supr-con

Comments: 10 pages, 1 figure

Subj-class: Superconductivity

\\

The superfluid properties of a two-state Fermi mixture in an optical lattice

are profoundly modified when an imbalance in the population of the two states

is present.We present analytical solutions for the free energy, and for the gap

and number equations in the saddle-point approximation describing resonant

superfluidity in the quasi-two-dimensional gas. Inhomogeneities due to the

trapping potentials can be taken into account using the local density

approximation. Analyzing the free energy in this approximation, we find that

phase separation occurs in the layers. The phase diagram of the superfluid and

normal phases is derived and analytical expressions for the phase lines are

presented. We complete the investigation by accounting for effects beyond

mean-field in the BEC limit where the system is more properly described as a

Bose-Fermi mixture of atoms and molecules.

\\ ( http://arXiv.org/abs/cond-mat/0701272 , 65kb)

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Paper: cond-mat/0701277

Date: Fri, 12 Jan 2007 14:52:29 GMT (48kb)

Title: Interferences in the density of two Bose-Einstein condensates consisting

of identical or different atoms

Authors: L. S. Cederbaum, A. I. Streltsov, Y. B. Band, O. E. Alon

Categories: cond-mat.other

Comments: 12 pages, 3 figures

Subj-class: Other

\\

The density of two {\it initially independent} condensates which are allowed

to expand and overlap can show interferences as a function of time due to

interparticle interaction. Two situations are separately discussed and

compared: (1) all atoms are identical and (2) each condensate consists of a

different kind of atoms. Illustrative examples are presented.

\\ ( http://arXiv.org/abs/cond-mat/0701277 , 48kb)

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Paper: cond-mat/0701280

Date: Fri, 12 Jan 2007 15:21:48 GMT (35kb)

Title: Phase diagram for interacting Bose gases

Authors: K. Morawetz, M. Maennel and M. Schreiber

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

Subj-class: Statistical Mechanics; Other

\\

We propose a new form of the inversion method in terms of a selfenergy

expansion to access the phase diagram of the Bose-Einstein transition. The

dependence of the critical temperature on the interaction parameter is

calculated. This is discussed with the help of a new condition for

Bose-Einstein condensation in interacting systems which follows from the pole

of the T-matrix in the same way as from the divergence of the medium-dependent

scattering length. A many-body approximation consisting of screened ladder

diagrams is proposed which describes the Monte Carlo data more appropriately.

The specific results are that a non-selfconsistent T-matrix leads to a linear

coefficient in leading order of 4.7, the selfconsistent T-matrix due to the

effective mass to a coefficient of 1.3 and the screened ladder approximation to

2.3 close to the Monte Carlo data.

\\ ( http://arXiv.org/abs/cond-mat/0701280 , 35kb)

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Paper: cond-mat/0701285

Date: Fri, 12 Jan 2007 16:36:15 GMT (427kb)

Title: Stability and dynamics of vortex clusters in nonrotated Bose-Einstein

condensates

Authors: V. Pietila, M. Mottonen, T. Isoshima, J. A. M. Huhtamaki, and S. M. M.

Virtanen

Categories: cond-mat.stat-mech

Comments: 6 pages, 6 figures

Subj-class: Statistical Mechanics

Journal-ref: Phys. Rev. A 74, 023603 (2006)

\\

We study stationary clusters of vortices and antivortices in dilute

pancake-shaped Bose-Einstein condensates confined in nonrotating harmonic

traps. Previous theoretical results on the stability properties of these

topologically nontrivial excited states are seemingly contradicting. We clarify

this situation by a systematic stability analysis. The energetic and dynamic

stability of the clusters is determined from the corresponding elementary

excitation spectra obtained by solving the Bogoliubov equations. Furthermore,

we study the temporal evolution of the dynamically unstable clusters. The

stability of the clusters and the characteristics of their destabilizing modes

only depend on the effective strength of the interactions between particles and

the trap anisotropy. For certain values of these parameters, there exist

several dynamical instabilities, but we show that there are also regions in

which some of the clusters are dynamically stable. Moreover, we observe that

the dynamical instability of the clusters does not always imply their

structural instability, and that for some dynamically unstable states

annihilation of the vortices is followed by their regeneration, and revival of

the cluster.

\\ ( http://arXiv.org/abs/cond-mat/0701285 , 427kb)

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Paper: physics/0701150

Date: Fri, 12 Jan 2007 18:26:44 GMT (33kb)

Title: Accurate numerical solutions of the time-dependent Schr\"odinger

equation

Authors: W. van Dijk and F. M. Toyama

Categories: physics.comp-ph

Comments: 10 pages, 5 figures

Subj-class: Computational Physics

\\

We present a generalization of the often-used Crank-Nicolson (CN) method of

obtaining numerical solutions of the time-dependent Schr\"odinger equation. The

generalization yields numerical solutions accurate to order $(\Delta x)^{2r-1}$

in space and $(\Delta t)^{2M}$ in time for any positive integers $r$ and $M$,

while CN employ $r=M=1$. We note dramatic improvement in the attainable

precision (circa 10 or greater orders of magnitude) along with several orders

of magnitude reduction of computational time. The improved method is shown to

lead to feasible studies of coherent-state oscillations with additional

short-range interactions, wavepacket scattering, and long-time studies of

decaying systems.

\\ ( http://arXiv.org/abs/physics/0701150 , 33kb)

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Paper: cond-mat/0701290

Date: Sat, 13 Jan 2007 01:31:32 GMT (125kb)

Title: Superfluid-Mott-Insulator Transition in a One-Dimensional Optical

Lattice with Double-Well Potentials

Authors: H. C. Jiang, Z. Y. Weng, and T. Xiang

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

Comments: 5 pages, 7 figures

Subj-class: Strongly Correlated Electrons; Mesoscopic Systems and Quantum Hall

Effect

\\

We study the superfluid-Mott-insulator transition of ultracold bosonic atoms

in a one-dimensional optical lattice with a double-well confining trap using

the density-matrix renormalization group. At low density, the system behaves

similarly as two separated ones inside harmonic traps. At high density,

however, interesting features appear as the consequence of the quantum

tunneling between the two wells and the competition between the "superfluid"

and Mott regions. They are characterized by a rich step-plateau structure in

the visibility and the satellite peaks in the momentum distribution function as

a function of the on-site repulsion. These novel properties shed light on the

understanding of the phase coherence between two coupled condensates and the

off-diagonal correlations between the two wells.

\\ ( http://arXiv.org/abs/cond-mat/0701290 , 125kb)

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Paper: cond-mat/0701321

Date: Mon, 15 Jan 2007 08:41:20 GMT (14kb)

Title: Ultraslow optical waveguiding in an atomic Bose-Einstein condensate

Authors: Devrim Tarhan, Nazmi Postacioglu, Ozgur E. Mustecaplioglu

Categories: cond-mat.other

Comments: 3 pages, 3 figures. submitted to Optics Letters

Subj-class: Other

\\

We investigate waveguiding of ultraslow light pulses in an atomic

Bose-Einstein condensate. We show that under the conditions of off-resonant

electromagnetically induced transparency, waveguiding with a few ultraslow

modes can be realized. The number of modes that can be supported by the

condensate can be controlled by means of experimentally accessible parameters

including trap size, temperature, atomic number density and scattering lengths.

Propagation constants and the mode conditions are determined analytically using

a WKB analysis. Mode profiles are found numerically.

\\ ( http://arXiv.org/abs/cond-mat/0701321 , 14kb)

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Paper: cond-mat/0701325

Date: Mon, 15 Jan 2007 09:27:26 GMT (187kb)

Title: Dispersive effects on optical information storage in Bose-Einstein

condensates with ultra-slow short pulses

Authors: Devrim Tarhan, Alphan Sennaroglu, Ozgur E. Mustecaplioglu

Categories: cond-mat.other

Comments: 32 pages, 12 figures

Subj-class: Other

Journal-ref: published in JOSA B, Vol. 23, Issue 9, pp. 1925-1933

\\

We investigate the potential of atomic Bose-Einstein condensates as dynamic

memory devices for coherent optical information processing. Specifically, the

number of ultraslow pulses that can be simultaneously present within the

storage time in the condensate has been analyzed. By modeling short-pulse

propagation through the condensate, taking into account high-order dispersive

properties, constraints on the information storage capacity are discussed. The

roles of temperature, spatial inhomogeneity, the interatomic interactions, and

the coupling laser on the pulse shape are pointed out. For a restricted set of

parameters, it has been found that coherent optical information storage

capacity would be optimized.

\\ ( http://arXiv.org/abs/cond-mat/0701325 , 188kb)

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Paper: cond-mat/0701326

Date: Mon, 15 Jan 2007 10:14:12 GMT (24kb)

Title: Predicted signatures of p-wave superfluid phases and Majorana zero modes

of fermionic atoms in RF absorption

Authors: Eytan Grosfeld, Nigel R. Cooper, Ady Stern, Roni Ilan

Categories: cond-mat.other

Subj-class: Other

\\

We study the superfluid phases of quasi-2D atomic Fermi gases interacting via

a p-wave Feshbach resonance. We calculate the absorption spectra of these

phases under a hyperfine transition, for both non-rotating and rotating

superfluids. We show that one can identify the different phases of the p-wave

superfluid from the absorption spectrum. The absorption spectrum shows clear

signatures of the existence of Majorana zero modes at the cores of vortices of

the weakly-pairing $p_x+ip_y$ phase.

\\ ( http://arXiv.org/abs/cond-mat/0701326 , 24kb)

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Paper: cond-mat/0701328

Date: Mon, 15 Jan 2007 11:18:22 GMT (543kb)

Title: Loading chromium atoms in a magnetic guide

Authors: A. Greiner, J. Sebastian, P. Rehme, A. Aghajani-Talesh, A. Griesmaier,

T.Pfau

Categories: cond-mat.other

Subj-class: Other

\\

We have realized a magnetic guide for ultracold chromium atoms by

continuously loading atoms directly from a Zeeman slower into a horizontal

guide. We observe an atomic flux of $2 \cdot 10^7$ atoms/s and are able to

control the mean velocity of the guided atoms between 0 m/s and 3 m/s. We

present our experimental results on loading and controlling the mean velocity

of the guided atoms and discuss the experimental techniques that are used.

\\ ( http://arXiv.org/abs/cond-mat/0701328 , 543kb)

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Paper: cond-mat/0701333

Date: Mon, 15 Jan 2007 14:58:52 GMT (966kb)

Title: Rapidly rotating boson molecules with long or short range repulsion: an

exact diagonalization study

Authors: Leslie O. Baksmaty, Constantine Yannouleas, Uzi Landman

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

Comments: To appear in Physical Review A. REVTEX. 16 pages with 15 figures. For

related papers, see http://www.prism.gatech.edu/~ph274cy/

Subj-class: Mesoscopic Systems and Quantum Hall Effect; Other

\\

The Hamiltonian for a small number, N <= 11, of bosons in a rapidly rotating

harmonic trap, interacting via a short range (contact potential) or a long

range (Coulomb) interaction, is studied via an exact diagonalization in the

lowest Landau level. Our analysis shows that, for both low and high fractional

fillings, the bosons localize and form rotating boson molecules (RBMs)

consisting of concentric polygonal rings. Focusing on systems with the number

of trapped atoms sufficiently large to form multi-ring bosonic molecules, we

find that, as a function of the rotational frequency and regardless of the type

of repulsive interaction, the ground-state angular momenta grow in specific

steps that coincide with the number of localized bosons on each concentric

ring. Comparison of the conditional probability distributions (CPDs) for both

interactions suggests that the degree of crystalline correlations appears to

depend more on the fractional filling nu than on the range of the interaction.

The RBMs behave as nonrigid rotors, i.e., the concentric rings rotate

independently of each other. At filling fractions nu < 1/2, we observe well

developed crystallinity in the CPDs (two-point correlation functions). For

larger filling fractions nu > 1/2, observation of similar molecular patterns

requires consideration of even higher-order correlation functions.

\\ ( http://arXiv.org/abs/cond-mat/0701333 , 966kb)

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Paper: cond-mat/0701337

Date: Mon, 15 Jan 2007 17:34:44 GMT (45kb)

Title: Phase Diagram of Interacting Bosons on the Honeycomb Lattice

Authors: Stefan Wessel

Categories: cond-mat.other

Comments: 4 pages with 5 figures

Subj-class: Other

\\

We study the ground state properties of repulsively interacting bosons on the

honeycomb lattice using large-scale quantum Monte Carlo simulations. In the

hard-core limit the half-filled system develops long ranged diagonal order for

sufficiently strong nearest-neighbor repulsion. This staggered solid melts at a

first order quantum phase transition into the superfluid phase, without the

presence of any intermediate supersolid phase. Within the superfluid phase,

both the superfluid density and the compressibility exhibit local minima near

particle- (hole-) density one quarter, while the density and the condensate

fraction show inflection points in this region. Relaxing the hard-core

constraint, supersolid phases emerge for soft-core bosons. The suppression of

the superfluid density is found to persist for sufficiently large, finite

on-site repulsion.

\\ ( http://arXiv.org/abs/cond-mat/0701337 , 45kb)

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Paper: cond-mat/0701346

Date: Mon, 15 Jan 2007 19:41:59 GMT (8kb)

Title: Expansion of a Bose-Einstein Condensate in the Presence of Disorder

Authors: B. Shapiro

Categories: cond-mat.other

Comments: 7 pages, 0 figures

Subj-class: Other

\\

Spreading of a BEC in a weak disordered potential is studied. The BEC is

released from a trap, under the condition of strong nonlinearity, so that $\mu

*>> (\hbar/\tau)$, where $\mu$ is the chemical potential prior to the release
*

and $\tau$ is the mean transport time. The spread is controlled by the single

parameter $\mu\tau/hbar$.

\\ ( http://arXiv.org/abs/cond-mat/0701346 , 8kb)

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Paper: cond-mat/0701350

Date: Mon, 15 Jan 2007 20:37:12 GMT (377kb)

Title: Unitary polarized Fermi gases

Authors: Fr\'{e}d\'{e}ric Chevy (LKB - Lhomond)

Categories: cond-mat.stat-mech cond-mat.mes-hall

Comments: 15 pages, to be published in the proceedings of the 2006 Enrico Fermi

summer school on Fermi gases

Proxy: ccsd hal-00124717

Subj-class: Statistical Mechanics; Mesoscopic Systems and Quantum Hall Effect

\\

Although recent theoretical and experimental progress have considerably

clarified pairing mechanisms in spin 1/2 fermionic superfluid with equally

populated internal states, many open questions remain when the two spin

populations are mismatched. We show here that, taking advantage of the

universal behavior characterizing the regime of infinite scattering length, the

macroscopic properties of these systems can be simply and quantitatively

understood in the regime of strong interactions.

\\ ( http://arXiv.org/abs/cond-mat/0701350 , 377kb)

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Paper: quant-ph/0701080

Date: Sun, 14 Jan 2007 11:36:31 GMT (34kb)

Title: Manipulating Quantum States of Molecules Created via Photoassociation of

Bose-Einstein Condensates

Authors: Xiao-Ting Zhou, Xiong-Jun Liu, Hui Jing, C. H. Lai and C. H. Oh

Categories: quant-ph

Comments: 4 Pages, 1 figure

\\

We show the quantum state transfer technique in two-color photoassociation

(PA) of a Bose-Einstein condensate, where a quantized field is used to couple

the free-bound transition from atom state to excited molecular state. Under the

weak excitation condition, we find that quantum states of the quantized field

can be transferred to the created molecular condensate. The feasibility of this

technique is confirmed by considering the atomic and molecular decays

discovered in the current PA experiments. The present results allow us to

manipulate quantum states of molecules in the photoassociation of a

Bose-Einstein condensate.

\\ ( http://arXiv.org/abs/quant-ph/0701080 , 34kb)

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Paper: quant-ph/0701094

Date: Mon, 15 Jan 2007 08:14:42 GMT (371kb)

Title: Optimal quantum control of Bose Einstein condensates in magnetic

microtraps

Authors: Ulrich Hohenester, Per Kristian Rekdal, Alfio Borzi, Joerg

Schmiedmayer

Categories: quant-ph

Comments: 11 pages, 7 figures

\\

Transport of Bose-Einstein condensates in magnetic microtraps, controllable

by external parameters such as wire currents or radio-frequency fields, is

studied within the framework of optimal control theory (OCT). We derive from

the Gross-Pitaevskii equation the optimality system for the OCT fields that

allow to efficiently channel the condensate between given initial and desired

states. For a variety of magnetic confinement potentials we study transport and

wavefunction splitting of the condensate, and demonstrate that OCT allows to

drastically outperfrom more simple schemes for the time variation of the

microtrap control parameters.

\\ ( http://arXiv.org/abs/quant-ph/0701094 , 371kb)

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Paper: cond-mat/0701364

Date: Tue, 16 Jan 2007 07:33:15 GMT (241kb)

Title: Localization of a Bose Einstein condensate in an optical superlattice

Authors: Aranya B Bhattacherjee

Categories: cond-mat.stat-mech

Comments: only Pdf file

Subj-class: Statistical Mechanics

\\

The Bloch and dipole oscillations of a Bose Einstein condensate (BEC) in an

optical superlattice is investigated. We show that the effective mass increases

in an optical superlattice, which leads to localization of the BEC, in

accordance with recent experimental observations. In addition, we find that the

secondary optical lattice is a useful additional tool to manipulate localized

excitations.

\\ ( http://arXiv.org/abs/cond-mat/0701364 , 241kb)

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Paper: cond-mat/0701365

Date: Tue, 16 Jan 2007 08:14:41 GMT (23kb)

Title: Spontaneous Symmetry Breaking in Superfluid Helium-4

Authors: Junpei Harada

Categories: cond-mat.other

Comments: 4 pages, 5 figures

Subj-class: Other

\\

We derive an analytical expression for a critical temperature of spontaneous

symmetry breaking in a repulsive hard-core interacting Bose system. We show

that the critical temperature of spontaneous symmetry breaking in a hard-core

interacting Bose system is determined by the three physical parameters: the

density of Bose liquid at absolute zero (rho_0), the mass (m) and the hard

sphere diameter (sigma) of a boson. The formula that we have derived is Tc =

rho_0 pi hbar^2 sigma / m^2 kB. We report Tc of liquid helium-4 is 2.194 K,

which is significantly close to the lambda temperature of 2.1768 K. The

deviation between the predicted and experimental values of the lambda

temperature is less than 1%.

\\ ( http://arXiv.org/abs/cond-mat/0701365 , 23kb)

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Paper: cond-mat/0701383

Date: Tue, 16 Jan 2007 17:42:16 GMT (254kb)

Title: Classical and quantum features of the superfluid to Mott insulator

transition

Authors: D. Witthaut, F. Trimborn, and H. J. Korsch

Categories: cond-mat.other

Comments: 4 figures

Subj-class: Other

\\

We analyze the correspondence of many-particle and mean-field dynamics for a

Bose-Einstein condensate in an optical lattice. Representing many-particle

quantum states by a classical phase space ensemble instead of one single

mean-field trajectory and taking into account the quantization of the density

by a modified integer Gross-Pitaevskii equation, it is possible to simulate the

superfluid to Mott insulator transition and other phenomena purely classically.

This approach can be easily extended to higher particle numbers and

multidimensional lattices. Moreover it provides an excellent tool to classify

true quantum features and to analyze the mean-field -- many particle

correspondence.

\\ ( http://arXiv.org/abs/cond-mat/0701383 , 254kb)

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Paper: cond-mat/0701384

Date: Tue, 16 Jan 2007 17:52:05 GMT (120kb)

Title: Multiscale quantum-defect theory for two interacting atoms in a

symmetric harmonic trap

Authors: Yujun Chen and Bo Gao

Categories: cond-mat.stat-mech

Comments: 10 pages, 6 figures

Subj-class: Statistical Mechanics

\\

We present a multiscale quantum-defect theory (QDT) for two identical atoms

in a symmetric harmonic trap that combines the quantum-defect theory for the

van der Waals interaction [B. Gao, Phys. Rev. A \textbf{64}, 010701(R) (2001)]

at short distances with a quantum-defect theory for the harmonic trapping

potential at large distances. The theory provides a systematic understanding of

two atoms in a trap, from deeply bound molecular states and states of different

partial waves, to highly excited trap states. It shows, e.g., that a strong $p$

wave pairing can lead to a lower energy state around the threshold than a $s$

wave pairing.

\\ ( http://arXiv.org/abs/cond-mat/0701384 , 120kb)

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Paper: quant-ph/0701110

Date: Tue, 16 Jan 2007 14:14:41 GMT (119kb)

Title: Preparing and probing atomic number states with an atom interferometer

Authors: J. Sebby-Strabley, B. L. Brown, M. Anderlini, P. J. Lee, P. R.

Johnson, W. D. Phillips, and J. V. Porto

Categories: quant-ph

\\

We describe the controlled loading and measurement of number-squeezed states

and Poisson states of atoms in individual sites of a double well optical

lattice. These states are input to an atom interferometer that is realized by

symmetrically splitting individual lattice sites into double wells, allowing

atoms in individual sites to evolve independently. The two paths then

interfere, creating a matter-wave double-slit diffraction pattern. The time

evolution of the double-slit diffraction pattern is used to measure the number

statistics of the input state. The flexibility of our double well lattice

provides a means to detect the presence of empty lattice sites, an important

and so far unmeasured factor in determining the purity of a Mott state.

\\ ( http://arXiv.org/abs/quant-ph/0701110 , 119kb)

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Paper: cond-mat/0701390

Date: Tue, 16 Jan 2007 22:10:38 GMT (94kb)

Title: Propagation of short pulses through a Bose-Einstein condensate

Authors: Devrim Tarhan, Seckin Sefi, Ozgur E. Mustecaplioglu

Categories: cond-mat.other

Comments: 5 pages, 2 figures

Subj-class: Other

Journal-ref: published in J. Phys.: Conf. Ser. 36 194-199 (2006)

\\

We study propagation of short laser pulses in a Bose-Einstein condensate

taking into account dispersive effects under the conditions for

electromagnetically induced transparency. We calculate dispersion coefficients

using typical experimental parameters of slow-light schemes in condensates. By

numerically propagating the laser pulse, and referring to theoretical

estimations, we determine the conditions for which dispersion starts to

introduce distortions on the pulse shape.

\\ ( http://arXiv.org/abs/cond-mat/0701390 , 94kb)

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Paper: cond-mat/0701407

Date: Wed, 17 Jan 2007 11:13:32 GMT (33kb)

Title: Bose-Einstein-condensed gases with arbitrary strong interactions

Authors: V.I. Yukalov and E.P. Yukalova

Categories: cond-mat.stat-mech

Comments: Latex file, 23 pages, 4 figures

Subj-class: Statistical Mechanics

Journal-ref: Phys. Rev. A 74 (2006) 063623-9

\\

Bose-condensed gases are considered with an effective interaction strength

varying in the whole range of the values between zero and infinity. The

consideration is based on the usage of a representative statistical ensemble

for Bose systems with broken global gauge symmetry. Practical calculations are

illustrated for a uniform Bose gas at zero temperature, employing a

self-consistent mean-field theory, which is both conserving and gapless.

\\ ( http://arXiv.org/abs/cond-mat/0701407 , 33kb)

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Paper: cond-mat/0701411

Date: Wed, 17 Jan 2007 13:31:19 GMT (209kb)

Title: Self-induced density modulations in the free expansion of Bose-Einstein

condensates

Authors: L. Salasnich, N. Manini, F. Bonelli, M. Korbman, and A. Parola

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

Comments: 4 pages, 4 figures

Subj-class: Other; Statistical Mechanics

\\

We simulate numerically the free expansion of a repulsive Bose-Einstein

condensate with an initially Gaussian density profile. We find a self-similar

expansion only for weak inter-atomic repulsion. In contrast, for strong

repulsion we observe the spontaneous formation of a shock wave at the surface

followed by a significant depletion inside the cloud. In the expansion,

contrary to the case of a classical viscous gas, the quantum fluid can generate

radial rarefaction density waves with several minima and maxima. These

intriguing nonlinear effects, never observed yet in free-expansion experiments

with ultra-cold alkali-metal atoms, can be detected with the available setups.

\\ ( http://arXiv.org/abs/cond-mat/0701411 , 209kb)

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Paper: cond-mat/0701416

Date: Wed, 17 Jan 2007 16:29:01 GMT (596kb)

Title: Quantum Theory of Cavity-Assisted Sideband Cooling of Mechanical Motion

Authors: Florian Marquardt, Joe P. Chen, A. A. Clerk, S. M. Girvin

Categories: cond-mat.mes-hall

Comments: 5 pages, 2 figures

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We present a fully quantum theory describing the cooling of a cantilever

coupled via radiation pressure to an illuminated optical cavity. Applying the

quantum noise approach to the fluctuations of the radiation pressure force, we

derive the opto-mechanical cooling rate and the minimum achievable phonon

number. We find that reaching the quantum limit of arbitrarily small phonon

numbers requires going into the good cavity (resolved phonon sideband) regime

where the cavity linewidth is much smaller than the mechanical frequency and

the corresponding cavity detuning. This is in contrast to the common assumption

that the mechanical frequency and the cavity detuning should be comparable to

the cavity damping.

\\ ( http://arXiv.org/abs/cond-mat/0701416 , 596kb)

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Paper: cond-mat/0701420

Date: Wed, 17 Jan 2007 19:00:59 GMT (15kb)

Title: Visibility of a Bose-condensed gas released from an optical lattice at

finite temperatures

Authors: Fabrice Gerbier, Simon Foelling, Artur Widera, Immanuel Bloch

Categories: cond-mat.stat-mech

Comments: Response to cond-mat/0609685; 5pages, 2 figures

Subj-class: Statistical Mechanics

\\

In response to a recent manuscript [cond-mat/0609685] on the analysis of

interference patterns produced by ultracold atoms released from an optical

lattice, we point out that in the presence of a Bose-Einstein condensate the

interference pattern can be strongly modified by interaction effects and the

presence of a harmonic trap superimposed on the lattice potential. Our results

show that the visibility of the interference pattern is significant only if a

sizeable condensate fraction is present in the trap.

\\ ( http://arXiv.org/abs/cond-mat/0701420 , 15kb)

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Paper: physics/0701191

Date: Tue, 16 Jan 2007 22:54:21 GMT (62kb)

Title: Increasing the coherence time of Bose-Einstein-condensate

interferometers with optical control of dynamics

Authors: James Stickney, Dana Z. Anderson, Alex Zozulya

Categories: physics.atom-ph

Comments: 34 Pages, 8 Figures

Subj-class: Atomic Physics

\\

Atom interferometers using Bose-Einstein condensate that is confined in a

waveguide and manipulated by optical pulses have been limited by their short

coherence times. We present a theoretical model that offers a physically simple

explanation for the loss of contrast and propose the method for increasing the

fringe contrast by recombining the atoms at a different time. A simple,

quantitatively accurate, analytical expression for the optimized recombination

time is presented and used to place limits on the physical parameters for which

the contrast may be recovered.

\\ ( http://arXiv.org/abs/physics/0701191 , 62kb)

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\\

Paper: physics/0701194

Date: Wed, 17 Jan 2007 12:05:04 GMT (76kb)

Title: Heteronuclear ionizing collisions between laser-cooled metastable helium

atoms

Authors: J. M. McNamara, R. J. W. Stas, W. Hogervorst, and W. Vassen

Categories: physics.atom-ph

Comments: 8 pages, 6 figures

Subj-class: Atomic Physics

\\

We have investigated cold ionizing heteronuclear collisions in dilute

mixtures of metastable (2 3S1) 3He and 4He atoms, extending our previous work

on the analogous homonuclear collisions [R. J. W. Stas et al., PRA 73, 032713

(2006)]. A simple theoretical model of such collisions enables us to calculate

the heteronuclear ionization rate coefficient, for our quasi-unpolarized gas,

in the absence of resonant light (T = 1.2 mK): K34(th) = 2.4*10^-10 cm^3/s.

This calculation is supported by a measurement of K34 using magneto-optically

trapped mixtures containing about 1*10^8 atoms of each species, K34(exp) =

2.5(8)*10^-10 cm^3/s. Theory and experiment show good agreement.

\\ ( http://arXiv.org/abs/physics/0701194 , 76kb)

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\\

Paper: cond-mat/0701421

Date: Wed, 17 Jan 2007 21:13:34 GMT (425kb)

Title: Linear response theory for a pair of coupled one-dimensional condensates

of interacting atoms

Authors: Vladimir Gritsev, Anatoli Polkovnikov, Eugene Demler

Categories: cond-mat.other

Comments: 11 pages, 7 figures

Subj-class: Other

\\

We use quantum sine-Gordon model to describe the low energy dynamics of a

pair of coupled one-dimensional condensates of interacting atoms. We show that

the nontrivial excitation spectrum of the quantum sine-Gordon model, which

includes soliton and breather excitations, can be observed in experiments with

time-dependent modulation of the tunneling amplitude, potential difference

between condensates, or phase of tunneling amplitude. We use the form-factor

approach to compute structure factors corresponding to all three types of

perturbations.

\\ ( http://arXiv.org/abs/cond-mat/0701421 , 425kb)

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\\

Paper: cond-mat/0701437

Date: Thu, 18 Jan 2007 09:28:13 GMT (108kb)

Title: On the theory of Bose-Einstein condensation of quasiparticles: on the

possibility of condensation of magnons at high temperatures

Authors: A.I. Bugrij and V.M. Loktev

Categories: cond-mat.stat-mech

Comments: 28 pages, 10 figures

Subj-class: Statistical Mechanics

Journal-ref: Low Temp. Phys. v.33, No 1 (January) (2007)

\\

Bose condensation of quasiparticles in physical systems of finite size iz

considered for the case of ferromagnetic thin films. It is shown that in

accordance with present-day experimental capabilities which permit one to

achieve densities of long-wave spin excitation of 1018-1019 cm-3, in such films

the formation of condensate of such quasiparticles begins at temperatures T~100

K (room one including). It is found that Bose condensation is accompanied by

scaling phenomenon according to which the main thermodynamic variable is not

the number N of particles but the ratio N/T. This indicates that condensation

of magnons can be observed at relatively low magnon densities. The roles played

by the shape of the spectrum and film thickness are analyzed.

\\ ( http://arXiv.org/abs/cond-mat/0701437 , 108kb)

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\\

Paper: cond-mat/0701439

Date: Thu, 18 Jan 2007 09:50:52 GMT (51kb)

Title: Quantum vortices in optical lattices

Authors: P. Vignolo (INFN Pisa, Italy), R. Fazio (SISSA Trieste and SNS Pisa,

Italy) and M.P. Tosi (SNS Pisa, Italy)

Categories: cond-mat.soft

Comments: 4 pages, 1 figure

Subj-class: Soft Condensed Matter

\\

A vortex in a superfluid gas inside an optical lattice can behave as a

massive particle moving in a periodic potential and exhibiting quantum

properties. In this Letter we discuss these properties and show that the

excitation of vortex motions in a two-dimensional lattice can lead to striking

measurable changes in its dynamic response. It would be possible by means of

Bragg spectroscopy to carry out the first direct measurement of the effective

vortex mass, the pinning to the underlying lattice, and the dissipative

damping.

\\ ( http://arXiv.org/abs/cond-mat/0701439 , 51kb)

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\\

Paper: cond-mat/0701441

Date: Thu, 18 Jan 2007 10:28:07 GMT (53kb)

Title: Quantum Monte Carlo study of a 1D phase-fluctuating condensate

Authors: C. Gils, L. Pollet, A. Vernier, F. Hebert, G.G. Batrouni, M. Troyer

Categories: cond-mat.stat-mech

Comments: 4 pages, 6 figures

Subj-class: Statistical Mechanics

\\

We study numerically the low temperature behaviour of a 1D Bose gas trapped

in an optical lattice. For a sufficient number of particles and weak repulsive

interactions, we find a clear regime of temperatures where density fluctuations

are negligible but phase fluctuations are considerable, i.e., a

quasicondensate. In the weakly interacting limit, our results are in very good

agreement with those obtained using a mean-field approximation. In coupling

regimes beyond the validity of mean-field approaches, a phase-fluctuating

condensate also appears, but the phase-correlation properties are qualitatively

different. It is shown that quantum depletion plays an important role.

\\ ( http://arXiv.org/abs/cond-mat/0701441 , 53kb)

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\\

Paper: cond-mat/0701446

Date: Thu, 18 Jan 2007 12:26:36 GMT (9kb)

Title: Enhancing capacity of coherent optical information storage and transfer

in a Bose-Einstein condensate

Authors: Ozgur E. Mustecaplioglu, Devrim Tarhan

Categories: cond-mat.other

Comments: 12pages. Laser Physics, in press

Subj-class: Other

\\

Coherent optical information storage capacity of an atomic Bose-Einstein

condensate is examined. Theory of slow light propagation in atomic clouds is

generalized to short pulse regime by taking into account group velocity

dispersion. It is shown that the number of stored pulses in the condensate can

be optimized for a particular coupling laser power, temperature and interatomic

interaction strength. Analytical results are derived for semi-ideal model of

the condensate using effective uniform density zone approximation. Detailed

numerical simulations are also performed. It is found that axial density

profile of the condensate protects the pulse against the group velocity

dispersion. Furthermore, taking into account finite radial size of the

condensate, multi-mode light propagation in atomic Bose-Einstein condensate is

investigated. The number of modes that can be supported by a condensate is

found. Single mode condition is determined as a function of experimentally

accessible parameters including trap size, temperature, condensate number

density and scattering length. Quantum coherent atom-light interaction schemes

are proposed for enhancing multi-mode light propagation effects.

\\ ( http://arXiv.org/abs/cond-mat/0701446 , 9kb)

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\\

Paper: cond-mat/0701450

Date: Thu, 18 Jan 2007 15:06:26 GMT (20kb)

Title: More Accurate Theory for Bose-Einstein Condensation Fraction

Authors: Shyamal Biswas

Categories: cond-mat.stat-mech

Comments: 5 pages, 3 figures

Subj-class: Statistical Mechanics

\\

In the thermodynamic limit the ratio of system size to thermal de Broglie

wavelength tends to infinity and the volume per particle of the system is

constant. Our familiar Bose-Einstein statistics is absolutely valid in the

thermodynamic limit. For finite thermodynamical system this ratio as well as

the number of particles is much greater than 1. However, according to the

experimental setup of Bose-Einstein condensation of harmonically trapped Bose

gas of alkali atoms this ratio near the condensation temperature($T_c$) is

$\sim 32$ and at ultralow temperatures well below $T_c$ a large fraction of

particles come down to the single particle ground state, and this ratio becomes

comparable to 1. We justify the finite size as well as ultralow temperature

correction to Bose-Einstein statistics. From this corrected statistics we plot

condensation fraction versus temperature graph. This theoretical plot satisfies

well with the experimental plot(A. Griesmaier et al..,Phys.Rev.Lett. \

{\bf{{94}}}{(2005){160401}}).

\\ ( http://arXiv.org/abs/cond-mat/0701450 , 20kb)

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\\

Paper: quant-ph/0701127

Date: Wed, 17 Jan 2007 22:07:32 GMT (28kb)

Title: The Physical Basis of the Gibbs-von Neumann entropy

Authors: O. J. E. Maroney

Categories: quant-ph

Comments: 34 pages, no figures (2nd version corrects bibliography error)

Report-no: pi-foundqt-36

\\

We develop the argument that the Gibbs-von Neumann entropy is the appropriate

statistical mechanical generalisation of the thermodynamic entropy, for

macroscopic and microscopic systems, whether in thermal equilibrium or not, as

a consequence of Hamiltonian dynamics. The mathematical treatment builds upon

well know results \cite{Gib1902,Tol1938,Weh78,Par89b}, and most importantly,

extends the arguments of \cite{Szi1925} to quantum mechanics. This enables the

identification of the canonical distribution as the unique representation of

thermal states, independant of any other thermodynamic considerations. The

Gibbs-von Neumann entropy can then be derived, from arguments based solely on

the addition of probabilities to Hamiltonian dynamics.

\\ ( http://arXiv.org/abs/quant-ph/0701127 , 28kb)

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\\

Paper: quant-ph/0701130

Date: Thu, 18 Jan 2007 16:53:17 GMT (17kb)

Title: Entanglement between two fermionic atoms inside a cylindrical harmonic

trap

Authors: B. Sun, D. L. Zhou, L. You

Categories: quant-ph

Comments: to appear in PRA

\\

We investigate quantum entanglement between two (spin-1/2) fermions inside a

cylindrical harmonic trap, making use of the von Neumann entropy for the

reduced single particle density matrix as the pure state entanglement measure.

We explore the dependence of pair entanglement on the geometry and strength of

the trap and on the strength of the pairing interaction over the complete range

of the effective BCS to BEC crossover. Our result elucidates an interesting

connection between our model system of two fermions and that of two interacting

bosons.

\\ ( http://arXiv.org/abs/quant-ph/0701130 , 17kb)

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\\

Paper: quant-ph/0701132

Date: Thu, 18 Jan 2007 13:04:24 GMT (715kb)

Title: Topological stability of stored optical vortices

Authors: R. Pugatch, M. Shuker, O. Firstenberg, A. Ron, N. Davidson

Comments: 4 pages, 4 figures

\\

We report an experiment in which an optical vortex is stored in a vapor of Rb

atoms. Due to its 2\pi phase twist, this mode, also known as the Laguerre-Gauss

mode, is topologically stable and cannot unwind even under conditions of strong

diffusion. To supplement our finding, we stored a flat phase Gaussian beam with

a dark center. Contrary to the optical vortex, which stays stable for over 100

microseconds, the dark center in the retrieved flat-phased image was filled

with light at storage times as small as 10 microseconds. This experiment proves

that higher electromagnetic modes can be converted into atomic coherences, and

that modes with phase singularities are robust to decoherence effects such as

diffusion. This opens the possibility to more elaborate schemes for two

dimensional information storage in atomic vapors.

\\ ( http://arXiv.org/abs/quant-ph/0701132 , 715kb)

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\\

Paper: quant-ph/0701133

Date: Thu, 18 Jan 2007 16:06:53 GMT (193kb)

Title: Trapping of light pulses in ensembles of stationary Lambda atoms

Authors: Kristian Rymann Hansen and Klaus Molmer

Categories: quant-ph

Comments: 10 pages, 4 figures

\\

We present a detailed theoretical description of the generation of stationary

light pulses by standing wave electromagnetically induced transparency in media

comprised of stationary atoms. We show that, contrary to thermal gas media, the

achievable storage times are limited only by the ground state dephasing rate of

the atoms, making such media ideally suited for nonlinear optical interactions

between stored pulses. Furthermore, we find significant quantitative and

qualitative differences between the two types of media, which are important for

quantum information processing schemes involving stationary light pulses.

\\ ( http://arXiv.org/abs/quant-ph/0701133 , 193kb)

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\\

Paper: physics/0701217

Date: Thu, 18 Jan 2007 16:27:55 GMT (65kb)

Title: Pseudo-potential treatment of two aligned dipoles under external

harmonic confinement

Authors: K. Kanjilal, J. L. Bohn, and D. Blume

Categories: physics.atom-ph

Comments: 9 pages, 4 figures

Subj-class: Atomic Physics

\\

Dipolar Bose and Fermi gases, which are currently being studied extensively

experimentally and theoretically, interact through anisotropic, long-range

potentials. Here, we replace the long-range potential by a zero-range

pseudo-potential that simplifies the theoretical treatment of two dipolar

particles in a harmonic trap. Our zero-range pseudo-potential description

reproduces the energy spectrum of two dipoles interacting through a

shape-dependent potential under external confinement very well, provided that

sufficiently many partial waves are included, and readily leads to a

classification scheme of the energy spectrum in terms of approximate angular

momentum quantum numbers. The results may be directly relevant to the physics

of dipolar gases loaded into optical lattices.

\\ ( http://arXiv.org/abs/physics/0701217 , 65kb)

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Replacements:

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Paper: cond-mat/0606151

replaced with revised version Fri, 12 Jan 2007 19:18:21 GMT (67kb)

Title: Structure of vortices in rotating Bose-Einstein condensates

Authors: Gentaro Watanabe, S. Andrew Gifford, Gordon Baym, C. J. Pethick

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

Comments: 10 pages, 9 figures, published version

Report-no: NORDITA-2006-15

Subj-class: Other; Mesoscopic Systems and Quantum Hall Effect

Journal-ref: Phys. Rev. A 74, 063621 (2006)

DOI: 10.1103/PhysRevA.74.063621

\\ ( http://arXiv.org/abs/cond-mat/0606151 , 67kb)

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\\

Paper: cond-mat/0607776

replaced with revised version Thu, 11 Jan 2007 21:40:03 GMT (72kb)

Title: The potential energy of a $^{40}$K Fermi gas in the BCS-BEC crossover

Authors: J. T. Stewart, J. P. Gaebler, C. A. Regal, and D. S. Jin

Categories: cond-mat.other

Subj-class: Other

Journal-ref: Phys. Rev. Lett. 97, 220406 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0607776 , 72kb)

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\\

Paper: cond-mat/0611645

replaced with revised version Fri, 12 Jan 2007 11:16:57 GMT (44kb)

Title: Classical field techniques for condensates in one-dimensional rings at

finite temperatures

Authors: A. Nunnenkamp, J. N. Milstein and K. Burnett

Categories: cond-mat.other

Comments: 7 pages, 7 figures; minor changes, one reference added

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0611645 , 44kb)

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\\

Paper: cond-mat/0701057

replaced with revised version Thu, 11 Jan 2007 21:08:10 GMT (23kb)

Title: Using time reversal symmetry for sensitive incoherent matter-wave Sagnac

interferometry

Authors: Y. Japha, O. Arzouan, Y. Avishai and R. Folman

Categories: cond-mat.other

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0701057 , 23kb)

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\\

Paper: cond-mat/0604673

replaced with revised version Sun, 14 Jan 2007 16:36:00 GMT (272kb)

Title: Evolution from a Bose-Einstein condensate to a Tonks-Girardeau gas: An

exact diagonalization study

Authors: Frank Deuretzbacher, Kai Bongs, Klaus Sengstock, Daniela Pfannkuche

Categories: cond-mat.other

Comments: 5 pages, 5 figures

Subj-class: Other

Journal-ref: Phys. Rev. A 75, 013614 (2007)

DOI: 10.1103/PhysRevA.75.013614

\\ ( http://arXiv.org/abs/cond-mat/0604673 , 272kb)

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\\

Paper: cond-mat/0607098

replaced with revised version Tue, 16 Jan 2007 01:59:58 GMT (31kb)

Title: Critical velocities for a superfluid in a periodic potential

Authors: Biao Wu and Junren Shi

Categories: cond-mat.supr-con

Comments: extensive revision, 4 pages and 4 figures

Subj-class: Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0607098 , 31kb)

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\\

Paper: cond-mat/0612544

replaced with revised version Tue, 16 Jan 2007 06:15:52 GMT (206kb)

Title: Ground states of hard-core bosons in one dimensional periodic potentials

Authors: Yuan Lin and Biao Wu

Categories: cond-mat.other

Comments: 6 pages, 6 figures

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0612544 , 206kb)

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\\

Paper: cond-mat/0610644

replaced with revised version Thu, 18 Jan 2007 08:10:58 GMT (178kb)

Title: Non-diffusive phase spreading of a Bose-Einstein condensate at finite

temperature

Authors: Alice Sinatra (LKB - Lhomond), Yvan Castin (LKB - Lhomond), Emilia

Witkowska

Categories: cond-mat.other

Comments: 16 pages, 7 figures

Proxy: ccsd hal-00109021

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0610644 , 178kb)

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\\

Paper: cond-mat/0611230

replaced with revised version Thu, 18 Jan 2007 20:35:34 GMT (16kb)

Title: Classifying Vortices in S=3 Bose-Einstein Condensates

Authors: Ryan Barnett, Ari Turner, Eugene Demler

Categories: cond-mat.str-el

Subj-class: Strongly Correlated Electrons

\\ ( http://arXiv.org/abs/cond-mat/0611230 , 16kb)

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\\

Paper: cond-mat/0612664

replaced with revised version Thu, 18 Jan 2007 14:52:44 GMT (67kb)

Title: Vortex quantum creation and winding number scaling in a quenched spinor

Bose gas

Authors: Michael Uhlmann, Ralf Sch\"utzhold, and Uwe R. Fischer

Categories: cond-mat.other

Comments: 4 pages of RevTex4, 2 figures; a few modifications, changed Fig. 2

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0612664 , 67kb)

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\\

Paper: quant-ph/0603016

replaced with revised version Thu, 18 Jan 2007 08:58:31 GMT (107kb)

Title: Quantum correlations of two optical fields close to electromagnetically

induced transparency

Authors: Alice Sinatra (LKB - Lhomond)

Categories: quant-ph

Comments: 4 pages, 5 figures

Proxy: ccsd ccsd-00019947

Journal-ref: Physical review letters 97 (19/12/2006) 253601

\\ ( http://arXiv.org/abs/quant-ph/0603016 , 107kb)

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Next week follows soon.

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 Fri Feb 02 2007 - 05:24:32 EST

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