Matt's arXiV selection, 16th December 2005.

From: Matthew Davis <>
Date: Fri, 16 Dec 2005 17:25:17 +1000 (EST)

The second week of my selection.

I am going to start sending this to a list of email addresses so that I
dont spam people who dont want it. If you would like to be on the list,
please let me know. I plan to send an email every week (probably Friday or

Also, feel free to let others know that I am trying to get this started: a
weekly selection biased towards cold atoms and quantum stuff from
cond-mat, quant-ph, and physics archives.

Enjoy! Matt.

Dr M. J. Davis,               Senior Lecturer in Physics
School of Physical Sciences,  email:
University of Queensland,     ph   : +61 7 334 69824
Brisbane, QLD 4072,           fax  : +61 7 336 51242
Paper: cond-mat/0507125
replaced with revised version Fri, 9 Dec 2005 19:12:51 GMT   (30kb)
Title: Berry Phase Effect on Semiclassical Dynamics of Bogoliubov
Authors: Chuanwei Zhang, Artem M. Dudarev, and Qian Niu
Comments: 5 pages, 1 figure
Subj-class: Statistical Mechanics
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Paper: cond-mat/0512216
Date: Sat, 10 Dec 2005 06:55:56 GMT   (586kb)
Title: Breaking of Chiral Symmetry and Spontaneous Rotation in a Spinor
   Bose-Einstein Condensate
Authors: Hiroki Saito, Yuki Kawaguchi, and Masahito Ueda
Comments: 5 pages, 4 figures
Subj-class: Other
   We show that a spin-1 Bose-Einstein condensate with ferromagnetic
interactions spontaneously generates a topological spin texture, in which
the m = \pm 1 components of the magnetic sublevels form vortices with opposite
circulations. This phenomenon originates from an interplay between
ferromagnetic interactions and spin conservation.
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Paper: cond-mat/0512218
Date: Sat, 10 Dec 2005 10:55:53 GMT   (437kb)
Title: Adiabatic N-soliton interactions of Bose-Einstein condensates in
   external potentials
Authors: V. S. Gerdjikov (Institute for Nuclear Research and Nuclear Energy,
   Bulgarian Academy of Sciences, Bulgaria), B. B. Baizakov, M. Salerno
   (Dipartimento di Fisica, Universit\'a di Salerno, Italy), N. A. Kostov
   (Institute for Electronics, Bulgarian Academy of Sciences, Bulgaria)
Comments: 13 pages, 8 figures, RevTeX
Subj-class: Other
   Perturbed version of the complex Toda chain (CTC) has been employed to
describe adiabatic interactions within N-soliton train of the nonlinear
Schrodinger equation (NLS). Perturbations induced by weak quadratic and
periodic external potentials are studied by both analytical and numerical
means. It is found that the perturbed CTC adequately models the N-soliton
train dynamics for both types of potentials. As an application of the developed
theory we consider the dynamics of a train of matter - wave solitons
confined to a parabolic trap and optical lattice, as well as tilted periodic
potentials. In the last case we demonstrate that there exist critical values of
the strength of the linear potential for which one or more localized states can
be extracted from a soliton train. An analytical expression for these critical
strengths for expulsion is also derived.
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Paper: cond-mat/0512232
Date: Sun, 11 Dec 2005 17:54:43 GMT   (297kb)
Title: Alternate solitons: Nonlinearly-managed one- and two-dimensional
   solitons in optical lattices
Authors: Arthur Gubeskys, Boris A. Malomed, and Ilya M. Merhasin
Comments: 10 pages + 16 figures
Subj-class: Other
Journal-ref: Studies in Applied Mathematics, Volume 115, Issue 2, Page 255-277,
   Aug 2005
   We consider a model of Bose-Einstein condensates which combines a stationary
optical lattice (OL) and periodic change of the sign of the scattering length
(SL) due to the Feshbach-resonance management. Ordinary solitons and ones of
the gap type being possible, respectively, in the model with constant negative
and positive SL, an issue of interest is to find solitons alternating, in the
case of the low-frequency modulation, between shapes of both types, across the
zero-SL point. We find such \textit{alternate solitons} and identify their
stability regions in the 2D and 1D models. Three types of the dynamical regimes
are distinguished: stable, unstable, and semi-stable. In the latter case, the
soliton sheds off a conspicuous part of its initial norm before relaxing to a
stable regime. In the 2D case, the threshold (minimum number of atoms)
necessary for the existence of the alternate solitons is essentially higher
than its counterparts for the ordinary and gap solitons in the static model. In
the 1D model, the alternate solitons are also found only above a certain
threshold, while the static 1D models have no threshold. In the 1D case, stable
antisymmetric alternate solitons are found too. Additionally, we consider a
possibility to apply the variational approximation (VA) to the description of
stationary gap solitons, in the case of constant positive SL. It predicts the
solitons in the first finite bandgap very accurately, and does it reasonably
well in the second gap too. In higher bands, the VA predicts a border between
tightly and loosely bound solitons.
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Paper: cond-mat/0512241
Date: Mon, 12 Dec 2005 19:00:03 GMT   (75kb)
Title: Quantum degenerate Bose-Fermi mixtures on 1-D optical lattices
Authors: Pinaki Sengupta, and Leonid P. Pryadko
Comments: 4 pages, 4 figures
Subj-class: Strongly Correlated Electrons
   We combine model mapping, exact spectral bounds, and a quantum Monte Carlo
method to study the ground state phases of a mixture of ultracold bosons and
spin-polarized fermions in a one-dimensional optical lattice. The exact
boundary of the boson-demixing transition is obtained from the Bethe Ansatz
solution of the standard Hubbard model. We prove that along a symmetry plane in
the parameter space, the boson-fermion mixed phase is stable at all densities.
This phase is a two-component Luttinger liquid for weak couplings or for
incommensurate total density, otherwise it has a charge gap but retains a
gapless mode of mixture composition fluctuations. The static density
correlations are studied in these two limits and shown to have markedly
different features.
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Paper: cond-mat/0512243
Date: Mon, 12 Dec 2005 09:15:14 GMT   (216kb)
Title: Phase diagram of Bose-Fermi mixtures in one-dimensional optical lattices
Authors: Lode Pollet, Matthias Troyer, Kris Van Houcke, Stefan M. A. Rombouts
Comments: 5 pages, 5 figures
Subj-class: Statistical Mechanics
   The ground state phase diagram of the one-dimensional Bose-Fermi Hubbard
model is studied in the canonical ensemble using a quantum Monte Carlo method.
We focus on the case where both species have half filling in order to maximize
the pairing correlations between the bosons and the fermions. In case of equal
hopping we distinguish between phase separation, a Luttinger liquid phase and a
phase characterized by strong singlet pairing between the species. True
long-range density waves exist with unequal hopping amplitudes.
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Paper: cond-mat/0506098
replaced with revised version Sun, 11 Dec 2005 17:43:08 GMT   (40kb)
Title: Phase diagram of spin-1 bosons on one-dimensional lattices
Authors: Matteo Rizzi, Davide Rossini, Gabriele De Chiara, Simone Montangero,
   and Rosario Fazio
Comments: 5 pages, 4 figures, published version
Subj-class: Other
Journal-ref: Phys Rev. Lett. 95, 240404 (2005)
DOI: 10.1103/PhysRevLett.95.240404
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Paper: quant-ph/0507091
replaced with revised version Mon, 12 Dec 2005 19:56:16 GMT   (419kb)
Title: Entangled light pulses from single cold atoms
Authors: Giovanna Morigi, Juergen Eschner, Stefano Mancini, and David Vitali
Comments: 4 pages, 3 figures, revised version (new scheme for generation of
   subsequent pairs of entangled pulses included). Accepted for publication in
   Phys. Rev. Lett
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Paper: physics/0510101
replaced with revised version Mon, 12 Dec 2005 10:20:23 GMT   (193kb)
Title: A new determination of the fine structure constant based on Bloch
   oscillations of ultracold atoms in a vertical optical lattic
Authors: Pierre Clad\'{e} (LKB - Jussieu), Estefania De Mirandes (LKB -
   Jussieu), Malo Cadoret (LKB - Jussieu), Sa\"{i}da Guellati-Kh\'{e}lifa
   (BNM-INM), Catherine Schwob (LKB - Jussieu), Fran\c{c}ois Nez (LKB -
   Jussieu), Lucile Julien (LKB - Jussieu), Fran\c{c}ois Biraben (LKB - Jussieu)
Proxy: ccsd ccsd-00011150
Subj-class: Atomic Physics
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Paper: cond-mat/0512243
replaced with revised version Tue, 13 Dec 2005 08:41:11 GMT   (216kb)
Title: Phase diagram of Bose-Fermi mixtures in one-dimensional optical lattices
Authors: Lode Pollet, Matthias Troyer, Kris Van Houcke, Stefan M. A. Rombouts
Comments: 5 pages, 5 figures, updated references
Subj-class: Statistical Mechanics
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Paper: physics/0512107
Date: Mon, 12 Dec 2005 22:01:20 GMT   (35kb)
Title: Dynamic Manipulation of Bose-Einstein Condensates With a Spatial Light
Authors: V. Boyer, R. M. Godun, G. Smirne, D. Cassettari, C. M. Chandrashekar,
   A. B. Deb, Z. J. Laczik, and C. J. Foot
Comments: 4 pages, 4 figures
Subj-class: Atomic Physics; Optics
   We manipulate a Bose-Einstein condensate using the optical trap created by
the diffraction of a laser beam on a fast ferro-electric liquid crystal spatial
light modulator. The modulator acts as a phase grating which can generate
arbitrary diffraction patterns and be rapidly reconfigured at rates up to 1 kHz
to create smooth, time-varying optical potentials. The flexibility of the
device is demonstrated with our experimental results for splitting a
Bose-Einstein condensate and independently transporting the separate parts of
the atomic cloud.
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Paper: cond-mat/0512294
Date: Wed, 14 Dec 2005 07:55:20 GMT   (22kb)
Title: Goldstone Theorem, Hugenholtz-Pines Theorem and Ward-Takahashi Relation
   in Finite Volume Bose-Einstein Condensed Gases
Authors: Hiroaki Enomoto, Masahiko Okumura and Yoshiya Yamanaka
Comments: 35pages
Subj-class: Strongly Correlated Electrons
   We construct an approximate scheme based on the concept of the spontaneous
symmetry breakdown, satisfying the Goldstone theorem, for finite volume
Bose-Einstein condensed gases in both zero and finite temperature case. In this
paper, we discuss the Bose-Einstein condensation in a box with periodic
boundary condition and do not assume the thermodynamic limit. When energy
spectrum is discrete, we found that it is necessary to deal with the
Nambu-Goldstone mode explicitly without the Bogoliubov's prescription, in which
zero-mode creation- and annihilation-operators are replaced with a {\it
c}-number by hand, for satisfying the Goldstone theorem. Furthermore, we
confirm that the unitary inequivalence of vacua in the spontaneous symmetry
breakdown is true for the finite volume system.
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Paper: cond-mat/0506118
replaced with revised version Wed, 14 Dec 2005 06:57:03 GMT   (132kb)
Title: Vortex Lattice in the Planar Bose-Einstein Condensates with Dipolar
Authors: Jian Zhang and Hui Zhai
Comments: 4 pages, 3 figures, published version
Subj-class: Other
Journal-ref: Physical Review Letters, 95, 200403 (2005)
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Paper: cond-mat/0506331
replaced with revised version Wed, 14 Dec 2005 20:03:13 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
Report-no: NORDITA-2005-40
Subj-class: Other
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Paper: cond-mat/0511501
replaced with revised version Wed, 14 Dec 2005 18:59:45 GMT   (558kb)
Title: Phase Transitions in Small Systems: Microcanonical vs. Canonical
Authors: J\"orn Dunkel and Stefan Hilbert
Comments: tex-style changed, minor additions in the text, references added
Subj-class: Statistical Mechanics
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Paper (*cross-listing*): quant-ph/0511035
replaced with revised version Wed, 14 Dec 2005 14:40:26 GMT   (14kb)
Title: Dephasing in matter-wave interferometry
Authors: Fernando C. Lombardo and Paula I. Villar
Comments: 9 pages, 1 eps-figure. To appear in J. Phys. A: Math. Gen
Subj-class: Quantum Physics; Other
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Paper: quant-ph/0512105
Date: Tue, 13 Dec 2005 22:03:00 GMT   (6kb)
Title: Deriving Landauer's erasure principle from statistical mechanics
Authors: Kurt Jacobs
Comments: 3 pages, revtex4. Comments appreciated
   We present a concise derivation of Landauer's erasure principle from the
postulates of statistical mechanics, along with a small number of additional
but uncontroversial axioms.
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Paper: physics/0512126
Date: Wed, 14 Dec 2005 16:06:25 GMT   (419kb)
Title: Sagnac Interferometry in a Slow-Light Medium
Authors: Graham T. Purves, Charles S. Adams and Ifan G. Hughes
Comments: 4 pages and 4 figures
Subj-class: Atomic Physics; Optics
   We use a Sagnac interferometer to measure the dispersive and absorptive
properties of room temperature Rubidium vapor on the D_2 line at 780.2 nm. We
apply a pump beam such that the resulting Lambda system exhibits
Electromagnetically Induced Transparency. Using a "biased alignment" technique
we demonstrate a direct and robust method of measuring the rapid variation in
the refractive index. Such a "slow-light" Sagnac interferometer is ideally
suited to precision measurement applications such as magnetometry and inertial
\\ ( ,  419kb)
Paper: cond-mat/0512344
Date: Thu, 15 Dec 2005 14:56:41 GMT   (117kb)
Title: Vortex state in Bose-Fermi mixture with attraction between bosons and
Authors: N.M. Chtchelkatchev, S.-T. Chui, V. N. Ryzhov
Comments: 7 pages, 8 figures
Subj-class: Statistical Mechanics
   Vortex states in the mixture of ultracold atomic clouds of bosons and
fermions are investigated using the effective Hamiltonian for the Bose
subsystem. A stability of the Bose system in the case of attractive interaction
between components is studied in the framework of variational Bose wave
function and Thomas-Fermi approximation. It is shown that the critical number
of bosons increases in the presence of the vortex.
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Paper: cond-mat/0512354
Date: Thu, 15 Dec 2005 17:05:20 GMT   (29kb)
Title: Trapped fermions with density imbalance in the BEC limit
Authors: P. Pieri and G.C. Strinati
Comments: 5 pages, 4 figures
Subj-class: Superconductivity; Other
   We analyze the effects of imbalancing the populations of two-component
trapped fermions, in the BEC limit of the attractive interaction between
different fermions. Starting from the gap equation with two fermionic chemical
potentials, we derive a set of coupled equations that describe composite bosons
and excess fermions. We include in these equations the processes leading to the
correct dimer-dimer and dimer-fermion scattering lengths. The coupled equations
are then solved in the Thomas-Fermi approximation to obtain the density
profiles for composite bosons and excess fermions, which are relevant to the
recent experiments with trapped fermionic atoms
\\ ( ,  29kb)
Paper: cond-mat/0512356
Date: Thu, 15 Dec 2005 17:36:36 GMT   (21kb)
Title: The XY Model and the Berezinskii-Kosterlitz-Thouless Phase Transition
Authors: Ralph Kenna
Comments: 5 pages, 1 figure. Short review prepared for the Annals of the Marie
   Curie Fellowships
Subj-class: Statistical Mechanics
   In statistical physics, the XY model in two dimensions provides the
paradigmatic example of phase transitions mediated by topological defects
(vortices). Over the years, a variety of analytical and numerical methods have
been deployed in an attempt to fully understand the nature of its transition,
which is of the Berezinskii-Kosterlitz-Thouless type. These met with only
limited success until it was realized that subtle effects (logarithmic
corrections) that modify leading behaviour must be taken into account. This
realization prompted renewed activity in the field and significant progress has
been made. This paper contains a review of the importance of such subtleties,
the role played by vortices and of recent and current research in this area.
Directions for desirable future research endeavours are outlined.
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Paper: cond-mat/0512359
Date: Thu, 15 Dec 2005 19:17:25 GMT   (6kb)
Title: Images of a Bose-Einstein condensate in position and momentum space
Authors: Jacek Dziarmaga and Krzysztof Sacha
Comments: 4 pages; Talk given at the Laser Physics Workshop, July 2005, Kyoto,
Subj-class: Other
   In the Bogoliubov theory a condensate initially prepared in its ground state
described by stationary Bogoliubov vacuum and later perturbed by a
time-dependent potential or interaction strength evolves into a time-dependent
excited state which is dynamical Bogoliubov vacuum. The dynamical vacuum has a
simple diagonal form in a time-dependent orthonormal basis of single particle
modes. This diagonal representation leads to a gaussian probability
distribution for possible outcomes of density measurements in position and
momentum space. In these notes we also discuss relations with the U(1) symmetry
breaking version of the Bogoliubov theory and give two equivalent gaussian
integral representations of the dynamical vacuum state.
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Paper: cond-mat/0509373
replaced with revised version Thu, 15 Dec 2005 09:17:01 GMT   (35kb)
Title: Dynamics of a trapped Fermi gas in the BCS phase
Authors: M. Urban and P. Schuck
Comments: 15 pages, 4 figures; v2: discussion and references added
Subj-class: Other; Nuclear Theory
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Paper: cond-mat/0510634
replaced with revised version Thu, 15 Dec 2005 15:43:01 GMT   (61kb)
Title: Spin-3 Chromium Bose-Einstein Condensates
Authors: L. Santos and T. Pfau
Comments: 4 pages, 3 eps figures. Error in the previous version corrected
Subj-class: Other
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Paper: quant-ph/0512119
Date: Thu, 15 Dec 2005 15:36:41 GMT   (17kb)
Title: On the Generators of Quantum Stochastic Master Equation
Authors: V. P. Belavkin
Comments: 14 pages. See also relevant papers at and
Journal-ref: Theoretical and Mathematical Physics, 110 (1997) No 1, 46--60
   A characterisation of the stochastic bounded generators of quantum
irreversible Master equations is given. This suggests the general form of
quantum stochastic evolution with respect to the Poisson (jumps), Wiener
(diffusion) or general Quantum Noise. The corresponding irreversible Heisenberg
evolution in terms of stochastic completely positive (CP) maps is found and the
general form of the stochastic completely dissipative (CD) operator equation is
\\ ( ,  17kb)
Paper: quant-ph/0512121
Date: Thu, 15 Dec 2005 16:23:28 GMT   (256kb)
Title: Normal mode splitting and mechanical effects of an optical lattice in a
   ring cavity
Authors: Julian Klinner, Malik Lindholdt, Boris Nagorny, and Andreas Hemmerich
Comments: 4 pages, 3 figures
   A novel regime of atom-cavity physics is explored, arising when large atom
samples dispersively interact with high-finesse optical cavities. A stable far
detuned optical lattice of several million rubidium atoms is formed inside an
optical ring resonator by coupling equal amounts of laser light to each
propagation direction of a longitudinal cavity mode. An adjacent longitudinal
mode, detunedby about 3 GHz, is used to perform probe transmission spectroscopy
of the system. The atom-cavity coupling for the lattice beams and the probe is
dispersive and dissipation results only from the finite photon-storage time.
The observation of two well-resolved normal modes demonstrates the regime of
strong cooperative coupling. The details of the normal mode spectrum reveal
mechanical effects associated with the retroaction of the probe upon the
optical lattice.
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Paper: physics/0512141
Date: Thu, 15 Dec 2005 16:59:46 GMT   (548kb)
Title: Single-impulse magnetic focusing of launched cold atoms
Authors: Matthew J Pritchard, Aidan S Arnold, David A Smith and Ifan G Hughes
Comments: 16 pages, 7 figures
Subj-class: Atomic Physics; Optics
Journal-ref: J. Phys. B, 37 4435 (2004)
   We have theoretically investigated the focusing of a launched cloud of cold
atoms. Time-dependent spatially-varying magnetic fields are used to impart
impulses leading to a three-dimensional focus of the launched cloud. We discuss
possible coil arrangements for a new focusing regime: isotropic 3D focusing of
atoms with a single-impulse magnetic lens. We investigate focusing aberrations
and find that, for typical experimental parameters, the widely used assumption
of a purely harmonic lens is often inaccurate. The baseball lens offers the
best possibility for isotropically focusing a cloud of weak-field-seeking atoms
in 3D.
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Paper: physics/0408088
replaced with revised version Thu, 15 Dec 2005 14:26:16 GMT   (45kb)
Title: Classical diffusion in double-delta-kicked particles
Authors: M. Stocklin and T.S. Monteiro
Comments: 8 pages, 2 figures, typo corrected
Subj-class: Atomic Physics
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Paper: physics/0411113
replaced with revised version Thu, 15 Dec 2005 13:56:54 GMT   (71kb)
Title: Manipulation of ultracold atomic mixtures using microwave techniques
Authors: D. Ciampini, E. Courtade, C. Sias, D. Cossart, G. Carelli, F. Mango,
   O. Morsch and E. Arimondo
Comments: 9 pages, 6 figures
Subj-class: Atomic Physics
\\ ( ,  71kb)
Received on Fri Dec 16 2005 - 17:25:17 EST

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