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

Date: Mon, 23 Jan 2006 10:40:31 +1000 (EST)

Date: Mon, 23 Jan 2006 10:40:31 +1000 (EST)

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Paper: cond-mat/0601289

Date: Fri, 13 Jan 2006 15:52:14 GMT (7kb)

Title: Force on a moving point impurity due to quantum fluctuations in a

Bose-Einstein condensate

Authors: D. C. Roberts

Subj-class: Statistical Mechanics; Other

\\

An analytic expression is derived for a force on a weak point impurity

arising from the scattering of quantum fluctuations in a slow-moving, weakly

interacting, three-dimensional Bose-Einstein condensate at zero temperature.

This force is shown to exist at all flow velocities, including those below

Landau's critical velocity. Furthermore, this force is shown to be directly

proportional to the flow speed.

\\ ( http://arXiv.org/abs/cond-mat/0601289 , 7kb)

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Paper: cond-mat/0508584

replaced with revised version Fri, 13 Jan 2006 20:09:24 GMT (36kb)

Title: Bose-Einstein Condensates in Rotating Lattices

Authors: Rajiv Bhat (1), L. D. Carr (2), M. J. Holland (1) ((1) JILA, National

Institute of Standards and Technology and Department of Physics, University

of Colorado-Boulder, (2) Colorado School of Mines)

Comments: 4 pages, 5 figures, Accepted for publication in PRL v2: Replaced

phase winding labels with symmetry eigenstate indices, replaced Gaussian

Ansatz with more general treatment and other minor changes

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0508584 , 36kb)

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Paper: cond-mat/0508629

replaced with revised version Fri, 13 Jan 2006 09:25:07 GMT (12kb)

Title: Anyonic Excitations in Fast Rotating Bose Gases Revisited

Authors: A. Lakhoua, M. Lassaut, T. Masson, J.C. Wallet

Comments: 5 pages. Improved version to be published in Phys. Rev. A, including

a physical discussion on relevant interactions and scattering regime together

with implication on the nature of statistical interaction

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\ ( http://arXiv.org/abs/cond-mat/0508629 , 12kb)

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Paper (*cross-listing*): quant-ph/0507167

replaced with revised version Fri, 13 Jan 2006 13:03:33 GMT (91kb)

Title: No approximate complex fermion coherent states

Authors: Tomas Tyc, Brett Hamilton, Barry C. Sanders and William D. Oliver

Comments: Argumentation made clearer

Subj-class: Quantum Physics; Other

\\ ( http://arXiv.org/abs/quant-ph/0507167 , 91kb)

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Paper: quant-ph/0601085

Date: Thu, 12 Jan 2006 23:34:55 GMT (245kb)

Title: The meaning of group delay in barrier tunneling: A re-examination of

superluminal group velocities

Authors: Herbert G. Winful

Comments: 33 pages, 4 figures

\\

We show that the group delay in tunneling is not a traversal time but a

lifetime of stored energy or stored probability escaping through both ends of

the barrier. Because it is a lifetime associated with both forward

(transmitted) and backward (reflected) fluxes, it cannot be used to define a

group velocity for forward transit in cases where a wavepacket is mostly

reflected. For photonic tunneling barriers the group delay is identical to the

dwell time which is also a property of an entire wave function with reflected

and transmitted components. Theoretical predictions and experimental reports of

superluminal group velocities in barrier tunneling are re-interpreted.

\\ ( http://arXiv.org/abs/quant-ph/0601085 , 245kb)

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Paper: quant-ph/0601086

Date: Fri, 13 Jan 2006 00:29:17 GMT (65kb)

Title: What is semiquantum mechanics?

Authors: A.J. Bracken

Comments: Talk presented at IVth International Symposium on Quantum Theory and

Symmetries, Varna, August, 2005. 13 pages, 4 figures

\\

Semiclassical approximations to quantum dynamics are almost as old as quantum

mechanics itself. In the approach pioneered by Wigner, the evolution of his

quasiprobability density function on phase space is expressed as an asymptotic

series in increasing powers of Planck's constant, with the classical

Liouvillean evolution as leading term. Successive semiclassical approximations

to quantum dynamics are defined by successive terms in the series. We consider

a complementary approach, which explores the quantum-clssical interface from

the other direction. Classical dynamics is formulated in Hilbert space, with

the Groenewold quasidensity operator as the image of the Liouville density on

phase space. The evolution of the Groenewold operator is then expressed as an

asymptotic series in increasing powers of Planck's constant. Successive

semiquantum approximations to classical dynamics are defined by successive

terms in this series, with the familiar quantum evolution as leading term.

\\ ( http://arXiv.org/abs/quant-ph/0601086 , 65kb)

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Paper: physics/0601097

Date: Fri, 13 Jan 2006 11:23:24 GMT (467kb)

Title: Atomic collider into dual-isotope magneto-optical trap

Authors: Gregory Surdutovich

Comments: 8 pages, 6 figures. pdf; this paper was reported at ICONO 2005 in

St.-Petersburg

Subj-class: Atomic Physics; Optics

\\

When two of three pairs of the Gaussian laser beams of a traditional MOT are

misaligned in the racetrack configuration the effective coordinate-dependent

vortex force do arise. Then an atom is accelerated by this vortex force until

its velocity not balanced by the damping force. This situation may produce a

stable ring of revolving atoms of a certain radius. Due to the different

frequency and laser beams intensity dependences of the vortex, damping and

trapping forces it is possible to equalize the radii of two orbiting groups of

atoms in two-species or dual-isotope magneto-optical trap and so to arrange a

continuing collider of cooled atoms with the prescribed relative velocity. A

collider setup for atoms of two different types rotating with different angular

velocities along the same ring-like trajectory into MOT of the conventional

six-beam geometry is proposed and designed on example of two rubidium isotopes

Rb85 and Rb87.

\\ ( http://arXiv.org/abs/physics/0601097 , 467kb)

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Paper: cond-mat/0601302

Date: Fri, 13 Jan 2006 21:40:15 GMT (20kb)

Title: Quantum magnetism with multicomponent polar molecules in an optical

lattice

Authors: Ryan Barnett, Dmitry Petrov, Mikhail Lukin, Eugene Demler

Subj-class: Strongly Correlated Electrons

\\

We consider bosonic dipolar molecules in an optical lattice prepared in a

mixture of different rotational states. The 1/r^3 interaction between molecules

for this system is produced by exchanging a quantum of angular momentum between

two molecules. We show that the Mott states of such systems have a large

variety of non-trivial spin orderings including a state with ordering wave

vector that can be changed by tilting the lattice. As the Mott insulating phase

is melted, we also describe several exotic superfluid phases that will occur.

\\ ( http://arXiv.org/abs/cond-mat/0601302 , 20kb)

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Paper: cond-mat/0601307

Date: Mon, 16 Jan 2006 18:54:03 GMT (878kb)

Title: Quantum coherence of Hard-Core-Bosons and Fermions : Extended, Glassy

and Mott Phases

Authors: Ana Maria Rey, Indubala I. Satija and Charles W. Clark

Comments: 5 pages, 4 figures

Subj-class: Other

\\

We use Hanbury-Brown-Twiss interferometry (HBTI) to study various quantum

phases of hard core bosons (HCBs) and ideal fermions confined in a

one-dimensional quasi-periodic (QP) potential. For HCBs, the QP potential

induces a cascade of Mott-like band-insulator phases in the extended regime, in

addition to the Mott insulator, Bose glass, and superfluid phases. At critical

filling factors, the appearance of these insulating phases is heralded by a

peak to dip transition in the interferogram, which reflects the fermionic

aspect of HCBs. On the other hand, ideal fermions in the extended phase display

various complexities of incommensurate structures such as devil's staircases

and Arnold tongues. In the localized phase, the HCB and the fermion

correlations are identical except for the sign of the peaks. Finally, we

demonstrate that HBTI provides an effective method to distinguish Mott and

glassy phases.

\\ ( http://arXiv.org/abs/cond-mat/0601307 , 878kb)

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Paper: cond-mat/0601314

Date: Sat, 14 Jan 2006 20:07:43 GMT (447kb)

Title: Density profiles of an imbalance trapped Fermi gas near a Feshbach

resonance

Authors: Theja N. De Silva, Erich J. Mueller

Comments: 4 pages, 5 Figures

Subj-class: Other

\\

We investigate the density profiles of a partially polarized trapped Fermi

gas in the BCS-BEC crossover region using mean field theory within the local

density approximation. Within this approximation the gas is phase separated

into concentric shells. We describe how the structure of these shells depends

upon the polarization and the interaction strength. Comparison with experiments

yields insight into the possibility of a polarized superfluid phase.

\\ ( http://arXiv.org/abs/cond-mat/0601314 , 447kb)

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Paper: cond-mat/0601321

Date: Sun, 15 Jan 2006 15:14:10 GMT (62kb)

Title: Pairing of a trapped resonantly-interacting fermion mixture with unequal

spin populations

Authors: Masudul Haque and H.T.C. Stoof

Comments: 4 figures, 4+ pages, revtex4

Subj-class: Other; Superconductivity

\\

We consider the phase separation of a trapped atomic mixture of fermions with

unequal spin populations near a Feshbach resonance. In particular, we determine

the density profile of the two spin states and compare with the recent

experiments of Partridge et al. (cond-mat/0511752). Overall we find quite good

agreement. We identify the remaining discrepancies and pose them as open

problems.

\\ ( http://arXiv.org/abs/cond-mat/0601321 , 62kb)

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Paper: cond-mat/0601350

Date: Mon, 16 Jan 2006 15:39:35 GMT (312kb)

Title: Bright solitons in Bose-Fermi mixtures

Authors: Tomasz Karpiuk, Miroslaw Brewczyk, and Kazimierz Rzazewski

Comments: 6 pages, 6 figures, 1 table

Subj-class: Other

\\

We consider the formation of bright solitons in a mixture of Bose and Fermi

degenerate gases confined in a three-dimensional elongated harmonic trap. The

Bose and Fermi atoms are assumed to effectively attract each other whereas

bosonic atoms repel each other. Strong enough attraction between bosonic and

fermionic components can change the character of the interaction within the

bosonic cloud from repulsive to attractive making thus possible the generation

of bright solitons in the mixture. On the other hand, such structures might be

in danger due to the collapse phenomenon existing in attractive gases. We show,

however, that under some conditions (defined by the strength of the Bose-Fermi

components attraction) the structures which neither spread nor collapse can be

generated. For elongated enough traps the formation of solitons is possible

even at the ``natural'' value of the mutual Bose-Fermi ($^{87}$Rb -$^{40}$K in

our case) scattering length.

\\ ( http://arXiv.org/abs/cond-mat/0601350 , 312kb)

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Paper: cond-mat/0403692

replaced with revised version Sat, 14 Jan 2006 19:23:47 GMT (17kb)

Title: Bell inequalities for random fields

Authors: Peter Morgan

Comments: 18 pages; 1 figure; v3: Better description of the relationship

between classical random fields and quantum fields; better description of

random field models. More extensive references. v2: Abstract and introduction

clarified

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0403692 , 17kb)

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Paper: cond-mat/0506331

replaced with revised version Sat, 14 Jan 2006 19:16:12 GMT (24kb)

Title: Breathing mode of rapidly rotating Bose-Einstein condensates

Authors: Gentaro Watanabe

Comments: 10 pages, 3 figures. Extended discussion. see also cond-mat/0512317.

Accepted for publication in Phys. Rev. A, one reference added

Report-no: NORDITA-2005-40

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0506331 , 24kb)

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Paper: cond-mat/0509766

replaced with revised version Mon, 16 Jan 2006 14:41:38 GMT (186kb)

Title: Filled Landau levels in neutral quantum gases

Authors: P. Ohberg, G. Juzeliunas, J. Ruseckas and M. Fleischhauer

Comments: Minor corrections. Phys. Rev. A, 053632 (2005). High resolution

figures can be obtained from the authors

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\ ( http://arXiv.org/abs/cond-mat/0509766 , 186kb)

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Paper: cond-mat/0509786

replaced with revised version Sat, 14 Jan 2006 23:59:09 GMT (34kb)

Title: General coordinate invariance and conformal invariance in

nonrelativistic physics: Unitary Fermi gas

Authors: D.T. Son and M. Wingate

Comments: 33 pages, 2 figures; v2: small typos fixed, references added

Report-no: INT-PUB 05-23

Subj-class: Other; Superconductivity; High Energy Physics - Theory; Nuclear

Theory

Journal-ref: Annals Phys. 321 (2006) 197-224

DOI: 10.1016/j.aop.2005.11.001

\\ ( http://arXiv.org/abs/cond-mat/0509786 , 34kb)

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Paper: cond-mat/0511752

replaced with revised version Sat, 14 Jan 2006 00:35:51 GMT (278kb)

Title: Pairing and Phase Separation in a Polarized Fermi Gas

Authors: Guthrie B. Partridge, Wenhui Li, Ramsey I. Kamar, Yean-an Liao,

Randall G. Hulet

Subj-class: Other; Strongly Correlated Electrons; Superconductivity

Journal-ref: Guthrie B. Partridge, Wenhui Li, Ramsey I. Kamar, Yean-an Liao,

and Randall G. Hulet, Science, 23 December 2005 (10.1126/science.1122876)

\\ ( http://arXiv.org/abs/cond-mat/0511752 , 278kb)

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Paper: quant-ph/0601103

Date: Mon, 16 Jan 2006 17:52:01 GMT (81kb)

Title: Optimal estimation of squeezing

Authors: G. Chiribella, G. M. D'Ariano, M. F. Sacchi

Comments: 4 pages, 2 eps figures

\\

We present the optimal estimation of an unknown squeezing transformation of

the radiation field. The optimal estimation is unbiased and is obtained by

properly considering the degeneracy of the squeezing operator. For coherent

input states, the r.m.s. of the estimation scales as $(2\sqrt {\bar n})^{-1}$

versus the average photon number $\bar n$, while it can be enhanced to $(2\bar

n)^{-1}$ by using displaced squeezed states.

\\ ( http://arXiv.org/abs/quant-ph/0601103 , 81kb)

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Paper (*cross-listing*): cond-mat/0503187

Date: Tue, 8 Mar 2005 17:19:30 GMT (12kb)

Title: Non-Abelian gauge potentials for ultra-cold atoms with degenerate dark

states

Authors: J. Ruseckas, G. Juzeliunas, P. Oehberg, M. Fleischhauer

Categories: cond-mat.mes-hall

Comments: 4 pages, 1 figure

Subj-class: Mesoscopic Systems and Quantum Hall Effect

Journal-ref: Phys. Rev. Lett. 95, 010404 (2005)

DOI: 10.1103/PhysRevLett.95.010404

\\

We show that the adiabatic motion of ultra-cold, multi-level atoms in

spatially varying laser fields can give rise to effective non-Abelian gauge

fields if degenerate adiabatic eigenstates of the atom-laser interaction exist.

A pair of such degenerate dark states emerges e.g. if laser fields couple three

internal states of an atom to a fourth common one under pairwise

two--photon-resonance conditions. For this so-called tripod scheme we derive

general conditions for truly non-Abelian gauge potentials and discuss special

examples. In particular we show that using orthogonal laser beams with orbital

angular momentum an effective magnetic field can be generated that has a

monopole component.

\\ ( http://arXiv.org/abs/cond-mat/0503187 , 12kb)

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Paper: quant-ph/0509038

replaced with revised version Mon, 16 Jan 2006 15:47:03 GMT (258kb)

Title: Stochastic mean-field dynamics for fermions in the weak coupling limit

Authors: Denis Lacroix

Comments: Enlarged version, 10 pages, 2 figures

Subj-class: Quantum Physics; Strongly Correlated Electrons

\\ ( http://arXiv.org/abs/quant-ph/0509038 , 258kb)

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Paper: quant-ph/0512214

replaced with revised version Mon, 16 Jan 2006 07:31:16 GMT (89kb)

Title: Infinite qubit rings with maximal nearest neighbor entanglement: the

Bethe ansatz solution

Authors: U. V. Poulsen, T. Meyer, D. Bruss, M. Lewenstein

Comments: 10 pages, 4 figures; updated references

\\ ( http://arXiv.org/abs/quant-ph/0512214 , 89kb)

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Paper (*cross-listing*): cond-mat/0512481

Date: Mon, 19 Dec 2005 22:08:11 GMT (71kb)

Title: Tunnelling rates for the nonlinear Wannier-Stark problem

Authors: Sandro Wimberger, Peter Schlagheck, and Riccardo Mannella

Subj-class: Other; Atomic Physics; Computational Physics

Journal-ref: J. Phys. B: At. Mol. Opt. Phys. 39 729-740 (2006)

DOI: 10.1088/0953-4075/39/3/024

\\

We present a method to numerically compute accurate tunnelling rates for a

Bose-Einstein condensate which is described by the nonlinear Gross-Pitaevskii

equation. Our method is based on a sophisticated real-time integration of the

complex-scaled Gross-Pitaevskii equation, and it is capable of finding the

stationary eigenvalues for the Wannier-Stark problem. We show that even weak

nonlinearities have significant effects in the vicinity of very sensitive

resonant tunnelling peaks, which occur in the rates as a function of the Stark

field amplitude. The mean-field interaction induces a broadening and a shift of

the peaks, and the latter is explained by analytic perturbation theory.

\\ ( http://arXiv.org/abs/cond-mat/0512481 , 71kb)

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Paper: cond-mat/0505306

replaced with revised version Tue, 17 Jan 2006 19:41:56 GMT (51kb)

Title: Many body exchange effects close to the s-wave Feshbach resonance in

two-component Fermi systems: Is a triplet superfluid possible?

Authors: Sergio Gaudio (1)(2), Jason Jackiewicz (2), Kevin S. Bedell (2) ((1)

Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM,

(2)Department of Physics, Boston College, Chestnut Hill, MA)

Comments: 5 pages, 5 figures,revised text version

Report-no: LAUR - 05-3423

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0505306 , 51kb)

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Paper: cond-mat/0512134

replaced with revised version Tue, 17 Jan 2006 19:29:07 GMT (51kb)

Title: Acoustic attenuation probe for fermion superfluidity in ultracold atom

gases

Authors: Sergio Gaudio (1)(2), B. Mihaila (2), K. B. Blagoev (2), K. S. Bedell

(1), Eddy Timmermans (2) (1) (Department of Physics, Boston College) (2)

(Theoretical Division, Los Alamos Natl Labs)

Comments: 5 pages, 2 figures. submitted to PRL

Report-no: LAUR-05-3432

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0512134 , 51kb)

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Paper: cond-mat/0512451

replaced with revised version Mon, 16 Jan 2006 23:33:38 GMT (28kb)

Title: Classification of Light-Induced Desorption of Alkali Atoms in Glass

Cells Used in Atomic Physics Experiments

Authors: Atsushi Hatakeyama, Markus Wilde, Katsuyuki Fukutani

Comments: 6 pages, 1 figure; minor corrections made, published in e-Journal of

Surface Science and Nanotechnology at

http://www.jstage.jst.go.jp/article/ejssnt/4/0/4_63/_article

Subj-class: Other; Atomic Physics

Journal-ref: e-J. Surf. Sci. Nanotech. Vol.4 (2006) 63-68

DOI: 10.1380/ejssnt.2006.63

\\ ( http://arXiv.org/abs/cond-mat/0512451 , 28kb)

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Paper: cond-mat/0601175

replaced with revised version Tue, 17 Jan 2006 15:21:59 GMT (30kb)

Title: Superfluid-Insulator transitions of bosons on Kagome lattice at

non-integer fillings

Authors: K. Sengupta, S. V. Isakov, Yong Baek Kim

Comments: 10 pages, 8 figures

Subj-class: Strongly Correlated Electrons; Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0601175 , 30kb)

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Paper: quant-ph/0601104

Date: Mon, 16 Jan 2006 21:03:08 GMT (183kb)

Title: Nonlinear Interferometry via Fock State Projection

Authors: G. Khoury, H.S. Eisenberg, E.J.S. Fonseca, and D. Bouwmeester

Comments: 4 pages, 5 figures

\\

We use a photon-number resolving detector to monitor the photon number

distribution of the output of an interferometer, as a function of phase delay.

As inputs we use coherent states with mean photon number up to seven. The

postselection of a specific Fock (photon-number) state effectively induces

high-order optical non-linearities. Following a scheme by Bentley and Boyd

[S.J. Bentley and R.W. Boyd, Optics Express 12, 5735 (2004)] we explore this

effect to demonstrate interference patterns a factor of five smaller than the

Rayleigh limit.

\\ ( http://arXiv.org/abs/quant-ph/0601104 , 183kb)

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Paper: quant-ph/0601107

Date: Tue, 17 Jan 2006 03:02:00 GMT (8kb)

Title: Many setting Bell's inequalities and Peres's conjecture

Authors: Koji Nagata and Wieslaw Laskowski

Comments: 6 pages

\\

We derive $d$-setting Bell inequality for $N$ qubits states ($d\geq 2$). We

investigate violations of the $d$-setting Bell inequality under the assumption

that suitable partial transposes of the density operator are positive. If the

partial transposes with respect to all subsystems are positive, all these Bell

inequalities are satisfied. This feature is independent of the values of $d$.

This is further supporting evidence for a conjecture by Peres that positivity

of partial transposes could lead us to the existence of the local realistic

theory. Further, it turns out that Greenberger-Horne-Zeilinger states violate

maximally all these Bell inequalities.

\\ ( http://arXiv.org/abs/quant-ph/0601107 , 8kb)

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Paper: cond-mat/0601392

Date: Tue, 17 Jan 2006 22:00:03 GMT (533kb)

Title: Noise Thermometry with Two Weakly Coupled Bose-Einstein Condensates

Authors: Rudolf Gati, Boerge Hemmerling, Jonas Foelling, Michael Albiez, Markus

K. Oberthaler

Comments: 4 pages, 4 figures

Subj-class: Other

\\

Here we report on the experimental investigation of thermally induced

fluctuations of the relative phase between two Bose-Einstein condensates which

are coupled via tunneling. The experimental control over the coupling strength

and the temperature of the thermal background allows for the quantitative

analysis of the phase fluctuations. Furthermore, we demonstrate the application

of these measurements for thermometry in a regime where standard methods fail.

With this we confirm that the heat capacity of an ideal Bose gas deviates from

that of a classical gas as predicted by the third law of thermodynamics.

\\ ( http://arXiv.org/abs/cond-mat/0601392 , 533kb)

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Paper: cond-mat/0601403

Date: Wed, 18 Jan 2006 10:32:48 GMT (453kb)

Title: Theory of coherent transport by an ultra-cold atomic Fermi gas through

linear arrays of potential wells

Authors: M.R. Bakhtiari, P. Vignolo, M.P. Tosi (SNS Pisa, Italy)

Comments: 14 pages, 4 figures

Subj-class: Disordered Systems and Neural Networks; Other

\\

Growing interest is being given to transport of ultra-cold atomic gases

through optical lattices generated by the interference of laser beams. In this

connection we evaluate the phase-coherent transport of a spin-polarized gas of

fermionic atoms along linear structures made from potential wells set in four

alternative types of sequence. These are periodic chains of either identical

wells or pairs of different wells, and chains of pairs of wells arranged in

either a Fibonacci quasi-periodic sequence or a random sequence. The

transmission coefficient of fermionic matter is evaluated in a T-matrix

scattering approach by describing each array through a tight-binding

Hamiltonian and by reducing it to an effective dimer by means of a

decimation/renormalization method. The results are discussed in comparison with

those pertaining to transport by Fermi-surface electrons coupled to an outgoing

lead and by an atomic Bose-Einstein condensate. Main attention is given to (i)

Bloch oscillations and their mapping into alternating-current flow through a

Josephson junction; (ii) interference patterns that arise on period doubling

and their analogy with beam splitting in optical interferometry; (iii)

localization by quasi-periodic disorder inside a Fibonacci-ordered structure of

double wells; and (iv) Anderson localization in a random structure of double

wells.

\\ ( http://arXiv.org/abs/cond-mat/0601403 , 453kb)

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Paper: cond-mat/0601408

Date: Wed, 18 Jan 2006 13:33:40 GMT (501kb)

Title: From a nonlinear string to a weakly interacting Bose gas

Authors: Emilia Witkowska, Mariusz Gajda and Jan Mostowski

Comments: 7 pages, 4 figures

Subj-class: Other

\\

We investigate a real scalar field whose dynamics is governed by a nonlinear

wave equation. We show that classical description can be applied to a quantum

system of many interacting bosons provided that some quantum ingredients are

included. An universal action has to be introduced in order to define particle

number. The value of this action should be equal to the Planck constant. This

constrain can be imposed by removing high frequency modes from the dynamics by

introducing a cut-off. We show that the position of the cut-off has to be

carefully adjusted. Finally, we show the proper choice of the cut-off ensures

that all low frequency eigenenmodes which are taken into account are

macroscopically occupied.

\\ ( http://arXiv.org/abs/cond-mat/0601408 , 501kb)

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Paper: cond-mat/0601414

Date: Wed, 18 Jan 2006 15:59:50 GMT (50kb)

Title: Homonuclear ionizing collisions of laser-cooled metastable helium atoms

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

Comments: 15 pages, 6 figures, submitted to Phys. Rev. A

Subj-class: Other

\\

We present a theoretical and experimental investigation of homonuclear

ionizing collisions of laser-cooled metastable helium atoms, considering both

the fermionic He-3 and bosonic He-4 isotope. The theoretical description

combines quantum threshold behavior, Wigner's spin-conservation rule and

quantum statistical symmetry requirements in a single-channel model,

complementing a more complete close-coupling theory that has been reported for

collisions of metastable He-4 atoms. The model is supported with measurements

(in the absence of light fields) of ionization rates in magneto-optically

trapped samples, that contain about 3*10^8 atoms of a single isotope. The

ionization rates are determined from measurements of trap loss due to

light-assisted collisions combined with comparative measurements of the ion

production rate in the absence and presence of trapping light. Theory and

experiment show good agreement.

\\ ( http://arXiv.org/abs/cond-mat/0601414 , 50kb)

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Paper: cond-mat/0601416

Date: Wed, 18 Jan 2006 17:43:53 GMT (11kb)

Title: Unconventional strongly interacting Bose-Einstein condensates in optical

lattices

Authors: A. B. Kuklov

Comments: 4 revtex pages, no figures

Subj-class: Other

\\

Adding particles to Bose-Mott insulator with the unity filling factor favors

superfluid ground states with non-zero momentum, if the onsite repulsion

exceeds the one-particle band gap. Such non-s-wave condensates, which break

symmetry of the lattice and may also feature the spontaneous time-reversal

symmetry breaking, can be revealed in specific absorption imaging patterns. The

case when fermions are added to the insulator is discussed as well.

\\ ( http://arXiv.org/abs/cond-mat/0601416 , 11kb)

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Paper: cond-mat/0601420

Date: Wed, 18 Jan 2006 19:59:28 GMT (934kb)

Title: Production of cold molecules via magnetically tunable Feshbach

resonances

Authors: Thorsten Koehler, Krzysztof Goral, Paul S. Julienne

Comments: 50 pages, 26 figures, submitted to Reviews of Modern Physics

Subj-class: Other

\\

Magnetically tunable Feshbach resonances were employed to associate cold

diatomic molecules in a series of experiments involving both atomic Bose as

well as two spin component Fermi gases. This review illustrates theoretical

concepts of both the particular nature of the highly excited Feshbach molecules

produced and the techniques for their association from unbound atom pairs.

Coupled channels theory provides the rigorous formulation of the microscopic

physics of Feshbach resonances in cold gases. Concepts of dressed versus bare

energy states, universal properties of Feshbach molecules, as well as the

classification in terms of entrance- and closed-channel dominated resonances

are introduced on the basis of practical two-channel approaches. Their

significance is illustrated for several experimental observations, such as

binding energies and lifetimes with respect to collisional relaxation.

Molecular association and dissociation are discussed in the context of

techniques involving linear magnetic field sweeps in cold Bose and Fermi gases

as well as pulse sequences leading to Ramsey-type interference fringes. Their

descriptions in terms of Landau-Zener, two-level mean field as well as beyond

mean field approaches are reviewed in detail, including the associated ranges

of validity.

\\ ( http://arXiv.org/abs/cond-mat/0601420 , 934kb)

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Paper: cond-mat/0402089

replaced with revised version Wed, 18 Jan 2006 17:42:58 GMT (58kb)

Title: Complex scaling approach to the decay of Bose-Einstein condensates

Authors: Peter Schlagheck and Tobias Paul

Comments: 10 pages, 6 figures

Subj-class: Soft Condensed Matter

\\ ( http://arXiv.org/abs/cond-mat/0402089 , 58kb)

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Paper: cond-mat/0411090

replaced with revised version Tue, 17 Jan 2006 23:00:34 GMT (88kb)

Title: Thermodynamics of Interacting Fermions in Atomic Traps

Authors: Qijin Chen, Jelena Stajic, and K. Levin

Comments: Final version -- Published in PRL. 4 figures

Subj-class: Superconductivity; Statistical Mechanics

Journal-ref: Phys. Rev. Lett. 95, 260405 (2005)

DOI: 10.1103/PhysRevLett.95.260405

\\ ( http://arXiv.org/abs/cond-mat/0411090 , 88kb)

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Paper: cond-mat/0502096

replaced with revised version Wed, 18 Jan 2006 10:30:26 GMT (254kb)

Title: Supershell structure in trapped dilute Fermi gases

Authors: Y.Yu, M. Ogren, S. Aberg, S. M. Reimann and M. Brack

Comments: 4 pages, 4 figures; In version 2, references added. The semiclassical

explanation of super-shell structure is refined. Version 3, as appeared in

Phys. Rev. A

Subj-class: Other

Journal-ref: Phys. Rev. A 72, 051602(R) (2005)

\\ ( http://arXiv.org/abs/cond-mat/0502096 , 254kb)

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Paper: cond-mat/0505689

replaced with revised version Tue, 17 Jan 2006 23:25:48 GMT (29kb)

Title: Population of closed-channel molecules in trapped Fermi gases with broad

Feshbach resonances

Authors: Qijin Chen and K. Levin

Comments: 4 pages, 3 figures, published in PRL

Subj-class: Superconductivity

Journal-ref: Phys. Rev. Lett. 95, 260406 (2005)

DOI: 10.1103/PhysRevLett.95.260406

\\ ( http://arXiv.org/abs/cond-mat/0505689 , 29kb)

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Paper: cond-mat/0601432

Date: Thu, 19 Jan 2006 19:21:34 GMT (435kb)

Title: Orbital Bose-Einstein condensation at non-zero momentum

Authors: W. Vincent Liu and Congjun Wu

Comments: 9 pages, 7 figures (with one in Appendix)

Subj-class: Other; Strongly Correlated Electrons

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The paradigm of Bose-Einstein condensation has been associated with zero

momentum to which a macroscopic fraction of bosons condense. Here we propose a

new quantum state where p-orbital atoms condense at non-zero momenta, defying

the zero momentum hallmark. Angular momentum simultaneously develops a

transversely staggered orbital current order, reminiscent of orbital

antiferromagnetism or d-density wave in correlated electronic systems. The new

state is predicted for a Bose-Fermi mixture of cold atoms confined in optical

lattices. We suggest that an interspecies Feshbach resonance significantly

reduces the energy gap between s and p bands, and a non-resonant two-boson

correlation further achieves a band reversal--favoring bosons populating the

p-band. The result is a new p-orbital Bose-Hubbard model, which perhaps has far

more implications for surprising quantum collective phenomena than realized

here.

\\ ( http://arXiv.org/abs/cond-mat/0601432 , 435kb)

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Paper: cond-mat/0601437

Date: Thu, 19 Jan 2006 10:49:01 GMT (42kb)

Title: Momentum interferences of a freely expanding Bose-Einstein condensate in

1D due to interatomic interaction change

Authors: A. Ruschhaupt, A. del Campo, and J. G. Muga

Comments: 4 pages, 5 figures

Subj-class: Other

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A Bose-Einstein condensate may be prepared in a highly elongated harmonic

trap with negligible interatomic interactions using a Feshbach resonance. If a

strong repulsive interatomic interaction is switched on and the axial trap is

removed to let the condensate evolve freely in the axial direction, a time

dependent quantum interference pattern takes place in the short time

(Thomas-Fermi) regime, in which the number of peaks of the momentum

distribution increases one by one, whereas the spatial density barely changes.

\\ ( http://arXiv.org/abs/cond-mat/0601437 , 42kb)

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Paper: cond-mat/0412174

replaced with revised version Thu, 19 Jan 2006 13:37:22 GMT (156kb)

Title: First-principles quantum dynamics in interacting Bose gases I: The

positive P representation

Authors: P. Deuar and P. D. Drummond

Comments: 21 pages, 7 figures, 2 tables, IOP style

Subj-class: Statistical Mechanics

Journal-ref: J. Phys. A: Math. Gen. 39, 1163 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0412174 , 156kb)

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Paper: quant-ph/0507061

replaced with revised version Thu, 19 Jan 2006 11:23:23 GMT (119kb)

Title: Differential atom interferometry beyond the standard quantum limit

Authors: K. Eckert, P. Hyllus, D. Bruss, U.V. Poulsen, M. Lewenstein, C.

Jentsch, T. Mueller, E.M. Rasel, and W. Ertmer

Comments: 10 pages, 5 figures; eq. (3) corrected and other minor changes

Journal-ref: Phys. Rev. A 73, 013814 (2006)

\\ ( http://arXiv.org/abs/quant-ph/0507061 , 119kb)

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Received on Mon Jan 23 2006 - 10:40:31 EST

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