Matt's arXiv selection: week ending 17 October 2008

From: Matthew Davis <>
Date: Sat, 18 Oct 2008 00:01:06 +1000

The following message was sent to the matts_arxiv list by Matthew Davis <>

Hi everyone,

This week there were 19 new preprints and 11 replacements. And I am officially
up to date - what a weight of my shoulders! That is, till next Friday at least...

Date: Thu, 9 Oct 2008 20:22:14 GMT (1045kb)

Title: Generalized Dynamical Mean-Field Theory for Bose-Fermi Mixtures in
   Optical Lattices
Authors: I. Titvinidze, M. Snoek, and W. Hofstetter
Categories: cond-mat.other
Comments: 12 pages 6 figures
   We give a detailed discussion of the recently developed Generalized Dynamical
Mean-Field Theory (GDMFT) for a mixture of bosonic and fermionic particles. We
show that this method is non-perturbative and exact in infinite dimensions and
reliably describes the full range from weak to strong coupling. Like in
conventional Dynamical Mean-Field Theory, the small parameter is 1/z, where z
is the lattice coordination number. We apply the GDMFT scheme to a mixture of
spinless fermions and bosons in an optical lattice. We investigate the
ossibility of a supersolid phase, focussing on the case of 1/2 filling for the
fermions and 3/2 filling for the bosons.
\\ ( , 1045kb)
Date: Fri, 10 Oct 2008 02:24:41 GMT (10kb)

Title: The Equation of State for Cold Fermi Condensates with Feshbach
Authors: Chi-Yong Lin, Da-Shin Lee, and Ray J. Rivers
Categories: cond-mat.supr-con
Comments: 4 pages
   In this paper we construct an effective field theory for a condensate of cold
Fermi atoms whose scattering is controlled by a Feshbach resonance. We show
how, from first principles, it permits a two-fluid description across the
BEC-BCS transition from which the equation of state, intimately related to the
speed of sound, can be derived.
\\ ( , 10kb)
Date: Fri, 10 Oct 2008 08:17:55 GMT (391kb)

Title: Bose Einstein condensation in a gas of the Fibonacci oscillators
Authors: Abdullah Algin
Categories: cond-mat.stat-mech
Comments: 39 pages, 10 figures, accepted on JSAT
Journal-ref: J. Stat. Mech.:Theor. Exp. (2008) P10009
DOI: 10.1088/1742-5468/2008/10/P10009
   We consider a system of the two-parameter deformed boson oscillators whose
spectrum is given by a generalized Fibonacci sequence. In order to obtain the
role of the deformation parameters (q1,q2) on the thermostatistics of the
system, we calculate several thermostatistical functions in the thermodynamical
limit and investigate the low-temperature behavior of the system. In this
framework, we show that the thermostatistics of the (q1,q2)-bosons can be
studied by the formalism of Fibonacci calculus which generalizes the recently
proposed formalism of q-calculus. We also discuss the conditions under which
the Bose-Einstein condensation would occur in the present two-parameter
generalized boson gas. However, the ordinary boson gas results can be obtained
by applying the limit q1=q2=1.
\\ ( , 391kb)
Date: Fri, 10 Oct 2008 18:35:59 GMT (77kb)

Title: Comparison of Different Pairing Fluctuation Approaches to BCS-BEC
Authors: K. Levin, Qijin Chen, Chih-Chun Chien and Yan He
Categories: cond-mat.other cond-mat.supr-con
Comments: 23 pages, 6 figures
   The subject of BCS - Bose Einstein condensation (BEC) crossover is
particularly exciting because of its realization in ultracold Fermi gases and
its possible relevance to high temperature superconductors. In the paper we
review that body of theoretical work on this subject which represents a natural
extension of the seminal papers by Leggett and by Nozieres and Schmitt-Rink
(NSR). The former addressed only the ground state, now known as the
"BCS-Leggett" wave-function and the key contributions of the latter pertain to
calculations of the superfluid transition temperature $T_c$. These two papers
have given rise to two main and, importantly, distinct, theoretical schools in
the BCS-BEC crossover literature. The first of these extends the BCS-Leggett
ground state to finite temperature and the second extends the NSR scheme away
from $T_c$ both in the superfluid and normal phases. It is now rather widely
accepted that these extensions of NSR produce a different ground state than
that first introduced by Leggett. Our analysis shows how the NSR-based approach
views the bosonic contributions more completely but it treats the fermions as
``quasi-free''. By contrast, the BCS-Leggett based approach treats the
fermionic contributions more completely but it treats the bosons as
``quasi-free''. The NSR based schemes approach the crossover between BCS and
BEC by starting from the BEC limit and the BCS-Leggett based scheme approaches
this crossover by starting from the BCS limit. Ultimately, one would like to
combine these two schemes. In this paper we review the strengths and weaknesses
of both approaches. To reach a full understanding, it is important in the
future to invest effort in investigating in more detail the T=0 aspects of
NSR-based theory and the $T \neq 0$ aspects of BCS-Leggett theory.
\\ ( , 77kb)
Date: Fri, 10 Oct 2008 18:50:38 GMT (967kb)

Title: Theory of Radio Frequency Spectroscopy Experiments in Ultracold Fermi
   Gases and Their Relation to Photoemission Experiments in the Cuprates
Authors: Qijin Chen, Yan He, Chih-Chun Chien, and K. Levin
Categories: cond-mat.supr-con cond-mat.other
Comments: 23 pages, 22 figures
   In this paper we present an overview of radio frequency (RF) spectroscopy in
the atomic Fermi superfluids. An ultimate goal is to suggest new directions in
the cold gas research agenda from the condensed matter perspective.Our focus is
on the experimental and theoretical literature of cold gases and photoemission
spectroscopy of the cuprates particularly as it pertains to areas of overlap.
This paper contains a systematic overview of the theory of RF spectroscopy,
both momentum integrated and momentum resolved. We discuss the effects of
traps, population imbalance, final state interactions over the entire range of
temperatures and compare theory and experiment. We show that this broad range
of phenomena can be accomodated within the BCS-Leggett description of BCS-BEC
crossover and that this scheme also captures some of the central observations
in photoemission experiments in the cuprates. In this last context, we note
that the key themes which have emerged in cuprate photoemission studies involve
characterization of the fermionic self energy, of the pseudogap and of the
effects of superconducting coherence (in passing from above to below the
superfluid transition temperature, $T_c$).These issues have a counterpart in
the cold Fermi gases and it would be most useful in future to use these atomic
systems to address these and the more sweeping question of how to describe that
anomalous superfluid phase which forms in the presence of a normal state
excitation gap.
\\ ( , 967kb)
Date: Fri, 10 Oct 2008 19:59:34 GMT (167kb)

Title: Molecular regimes in ultracold Fermi gases
Authors: D.S. Petrov, C. Salomon, G.V. Shlyapnikov
Categories: cond-mat.other cond-mat.stat-mech
Comments: Chapter of the book: "Cold Molecules: Theory, Experiment,
   Applications" edited by R. V. Krems, B. Friedrich and W. C. Stwalley
   (publication expected in March 2009)
   The use of Feshbach resonances for tuning the interparticle interaction in
ultracold Fermi gases has led to remarkable developments, in particular to the
creation and Bose-Einstein condensation of weakly bound diatomic molecules of
fermionic atoms. These are the largest diatomic molecules obtained so far, with
a size of the order of thousands of angstroms. They represent novel composite
bosons, which exhibit features of Fermi statistics at short intermolecular
distances. Being highly excited, these molecules are remarkably stable with
respect to collisional relaxation, which is a consequence of the Pauli
exclusion principle for identical fermionic atoms. The purpose of this review
is to introduce theoretical approaches and describe the physics of molecular
regimes in two-component Fermi gases and Fermi-Fermi mixtures, focusing
attention on quantum statistical effects.
\\ ( , 167kb)
Date: Fri, 10 Oct 2008 20:53:50 GMT (320kb)

Title: Coherent Atom-Molecule Oscillations in a Bose-Fermi Mixture
Authors: M. L. Olsen, J. D. Perreault, T. D. Cumby, and D. S. Jin
Categories: cond-mat.other
Comments: 5 pages, 5 figures
   We create atom-molecule superpositions in a Bose-Fermi mixture of Rb-87 and
K-40 atoms. The superpositions are generated by ramping an applied magnetic
field near an interspecies Fano-Feshbach resonance to coherently couple atom
and molecule states. Rabi- and Ramsey-type experiments show oscillations in the
molecule population that persist as long as 150 microseconds and have up to 50%
contrast. The frequencies of these oscillations are magnetic-field dependent
and are consistent with the predicted molecule binding energy. This new type of
quantum superposition involves particles of different statistics (i.e. bosons
and fermions) and demonstrates atom-molecule coherence without a Bose-Einstein
condensate (BEC).
\\ ( , 320kb)
Date: Sat, 11 Oct 2008 13:52:30 GMT (2335kb)

Title: Structure formation during the collapse of a dipolar atomic
   Bose-Einstein condensate
Authors: N.G. Parker, C. Ticknor, A.M. Martin and D.H.J. O'Dell
Categories: cond-mat.other
Comments: 15 pages, 13 figures
   We investigate the collapse of a trapped dipolar Bose-Einstein condensate.
This is performed by numerical simulations of the Gross-Pitaevskii equation and
the novel application of the Thomas-Fermi hydrodynamic equations to collapse.
We observe regimes of both global collapse, where the system evolves to a
highly elongated or flattened state depending on the sign of the dipolar
interaction, and local collapse, which arises due to dynamically unstable
phonon modes and leads to a periodic arrangement of density shells, disks or
stripes. In the adiabatic regime, where ground states are followed, collapse
can occur globally or locally, while in the non-adiabatic regime, where
collapse is initiated suddenly, local collapse commonly occurs. We analyse the
dependence on the dipolar interactions and trap geometry, the length and time
scales for collapse, and relate our findings to recent experiments.
\\ ( , 2335kb)
Date: Mon, 13 Oct 2008 11:57:18 GMT (210kb)

Title: A Dissipative Tonks-Girardeau Gas of Molecules
Authors: S. D\"urr, N. Syassen, D. M. Bauer, M. Lettner, T. Volz, D. Dietze, J.
   J. Garcia-Ripoll, J. I. Cirac, G. Rempe
Categories: cond-mat.other
Comments: To appear in "ATOMIC PHYSICS 21", proceedings of the XXI
   International Conference on Atomic Physics (ICAP 2008)
   Strongly correlated states in many-body systems are traditionally created
using elastic interparticle interactions. Here we show that inelastic
interactions between particles can also drive a system into the strongly
correlated regime. This is shown by an experimental realization of a specific
strongly correlated system, namely a one-dimensional molecular Tonks-Girardeau
\\ ( , 210kb)
Date: Mon, 13 Oct 2008 12:39:57 GMT (278kb)

Title: Cancellation of nonlinear Zeeman shifts with light shifts
Authors: K. Jensen, V. M. Acosta, J. M. Higbie, M. P. Ledbetter, S. M.
   Rochester and D. Budker
Categories: physics.atom-ph
Comments: 5 pages, 5 figures
   Nonlinear Zeeman (NLZ) shifts arising from magnetic-field mixing of the two
hyperfine ground-states in alkali atoms lead to splitting of magnetic-resonance
lines. This is a major source of sensitivity degradation and the so-called
"heading errors" of alkali-vapor atomic magnetometers operating in the
geophysical field range (B approx. 0.2-0.7 G). Here, it is shown theoretically
and experimentally that NLZ shifts can be effectively canceled by light shifts
caused by a laser field of appropriate intensity, polarization and frequency, a
technique that can be readily applied in practical situations.
\\ ( , 278kb)
Date: Mon, 13 Oct 2008 14:00:13 GMT (308kb)

Title: Single-photon cooling to the limit of trap dynamics: Maxwell's Demon
   near maximum efficiency
Authors: S. Travis Bannerman, Gabriel N. Price, Kirsten Viering, and Mark G.
Categories: physics.atom-ph
   We demonstrate a general and efficient informational cooling technique for
atoms which is an experimental realization of Maxwell's Demon. The technique
transfers atoms from a magnetic trap into an optical trap via a single
spontaneous Raman transition which is discriminatively driven near each atom's
classical turning point. We report compression of phase-space by a factor of
350 and transfer efficiencies up to 2.2%. We compare our transfer efficiency
with an analytical model and show that the performance is limited only by
particle dynamics in the magnetic trap
\\ ( , 308kb)
Date: Sun, 12 Oct 2008 04:24:04 GMT (486kb)

Title: Atomic Clocks and Coherent Population Trapping: Experiments for
   Undergraduate Laboratories
Authors: Nathan Belcher, Eugeniy E. Mikhailov, Irina Novikova
Categories: physics.ed-ph physics.atom-ph
Comments: 10 pages, 10 figures
   We demonstrate how to construct and operate a simple and affordable
experimental apparatus, appropriate for an undergraduate setting, in order to
produce and study coherent effects in atomic vapor and to investigate their
applications for metrology. The apparatus consists of a vertical cavity surface
emitting diode laser (VCSEL) directly current-modulated using a tunable
microwave oscillator to produce multiple optical fields needed for the
observation of the coherent population trapping (CPT). This effect allows very
accurate measurement of the transition frequency between two ground state
hyperfine sublevels (a "clock transition"), that can be used to construct a
CPT-based atomic clock.
\\ ( , 486kb)
Date: Tue, 14 Oct 2008 11:04:51 GMT (138kb)

Title: Entanglement Theory and the Second Law of Thermodynamics
Authors: Fernando G.S.L. Brandao and Martin B. Plenio
Categories: quant-ph
Comments: Published in Nature Physics as advanced online publication (October
   2008). This is the original submitted version
DOI: 10.1038/nphys1100
   Entanglement is central both to the foundations of quantum theory and, as a
novel resource, to quantum information science. The theory of entanglement
establishes basic laws, such as the non-increase of entanglement under local
operations, that govern its manipulation and aims to draw from them formal
analogies to the second law of thermodynamics. However, while in the second law
the entropy uniquely determines whether a state is adiabatically accessible
from another, the manipulation of entanglement under local operations exhibits
a fundamental irreversibility which prevents the existence of such an order.
   Here we show that a reversible theory of entanglement and a rigorous
relationship with thermodynamics may be established when one considers all
non-entangling transformations. The role of the entropy in the second law is
taken by the asymptotic relative entropy of entanglement in the basic law of
entanglement. We show the usefulness of this new approach to general resource
theories and to quantum information theory.
\\ ( , 138kb)
Date: Wed, 15 Oct 2008 17:33:16 GMT (1313kb)

Title: Ultracold Atoms in 1D Optical Lattices: Mean Field, Quantum Field,
   Computation, and Soliton Formation
Authors: R. V. Mishmash, L. D. Carr
Categories: cond-mat.other
Comments: 14 pages, 2 figures; to appear in Journal of Mathematics and
   Computers in Simulation
   In this work, we highlight the correspondence between two descriptions of a
system of ultracold bosons in a one-dimensional optical lattice potential: (1)
the discrete nonlinear Schr\"{o}dinger equation, a discrete mean-field theory,
and (2) the Bose-Hubbard Hamiltonian, a discrete quantum-field theory. The
former is recovered from the latter in the limit of a product of local coherent
states. Using a truncated form of these mean-field states as initial
conditions, we build quantum analogs to the dark soliton solutions of the
discrete nonlinear Schr\"{o}dinger equation and investigate their dynamical
properties in the Bose-Hubbard Hamiltonian. We also discuss specifics of the
numerical methods employed for both our mean-field and quantum calculations,
where in the latter case we use the time-evolving block decimation algorithm
due to Vidal.
\\ ( , 1313kb)
Date: Wed, 15 Oct 2008 06:02:21 GMT (387kb,D)

Title: Vortex quantum dynamics of two dimensional lattice bosons
Authors: Netanel H. Lindner, Assa Auerbach and Daniel P. Arovas
Categories: cond-mat.supr-con cond-mat.str-el
   Vortices, which are introduced into a boson superfluid by rotation or a
magnetic field, tend to localize in a lattice configuration which coexists with
superfluidity. In two dimensions a vortex lattice can melt by quantum
fluctuations resulting in a non-superfluid Quantum Vortex Liquid (QVL). Present
microscopic understanding of vortex dynamics of lattice bosons is insufficient
to predict the actual melting density. A missing energy scale, which is
difficult to obtain perturbatively or semiclassically, is the "bare" vortex
hopping rate on the dual lattice. Another puzzle is the temperature dependent
Hall conductivity which reflects the effective vortex Magnus dynamics in the
QVL phase. In this paper we compute these quantities by exact diagonalization
of finite clusters near half filling. Mapping our effective Hamiltonian to the
Boson Coloumb Liquid simulated in Phys. Rev. Lett. 73, 826 (1994), we expect a
QVL above a melting density of 0.0065 vortices per lattice site. The Hall
conductivity near half filling reverses sign in a sharp transition accompanied
by a vanishing temperature scale. At half filling, we show that vortices carry
spin half degrees of freedom (`v-spins'), as a consequence of local non
commuting SU(2) symmetries. Our findings could be realized in cold atoms,
Josephson junction arrays and cuprate superconductors.
\\ ( , 387kb)
Date: Wed, 15 Oct 2008 13:43:21 GMT (195kb)

Title: Statistical mechanics of a Feshbach coupled Bose-Fermi gas in an optical
Authors: O. Soe Sorensen, N. Nygaard, and P. B. Blakie
Categories: cond-mat.other
Comments: 8 pages, 5 figures
   We consider an atomic Fermi gas confined in a uniform optical lattice
potential, where the atoms can pair into molecules via a magnetic field
controlled narrow Feshbach resonance. The phase diagram of the resulting
atom-molecule mixture in chemical and thermal equilibrium is determined
numerically in the absence of interactions under the constraint of particle
conservation. In the limiting cases of vanishing or large lattice depth we
derive simple analytical results for important thermodynamic quantities. One
such quantity is the dissociation energy, defined as the detuning of the
molecular energy spectrum with respect to the atomic one for which half of the
atoms have been converted into dimers. Importantly we find that the
dissociation energy has a non-monotonic dependence on lattice depth.
\\ ( , 195kb)
Date: Wed, 15 Oct 2008 01:20:36 GMT (281kb,D)

Title: Reduced-Quantum-Uncertainty States for an Atomic Clock
Authors: Monika H. Schleier-Smith, Ian D. Leroux and Vladan Vuleti\'c
Categories: quant-ph
Comments: Letter (5 pages, 4 figures) followed by Supplementary Methods (7
   pages, 3 figures). Submitted to Nature Physics
   Many of the most accurate measurements of physical quantities are performed
on ensembles of particles with discrete quantum mechanical levels. When the
particles in the ensemble are uncorrelated, the measurement precision is
limited by the projection noise associated with the random measurement outcomes
for the individual particles. This is known as the standard quantum limit
(SQL). However, it is possible to induce quantum mechanical correlations
(entanglement) between the particles to generate reduced-uncertainty states
("squeezed states") that, when used as input states to the measurement
sequence, overcome the SQL. Here we demonstrate that an optical quantum
non-demolition (QND) measurement can generate a squeezed input state for an
atomic clock. We verify the entanglement of 5*10^4 rubidium atoms by comparing
the observed reduction in projection noise (up to 9.4(8) dB) with the
accompanying reduction in signal, finding sufficient squeezing to allow a
3.2(8) dB improvement in clock precision over the SQL.
\\ ( , 281kb)
Date: Thu, 16 Oct 2008 09:55:08 GMT (84kb)

Title: Bell-inequality test of spatial mode entanglement
Authors: Libby Heaney and Janet Anders
Categories: quant-ph
Comments: 5 pages, 2 figures. Comments are welcome
   Experiments showing the violation of Bell inequalities have formed our belief
that the world at its smallest is genuinely non-local. While many non-locality
experiments use the first quantised picture, the physics of fields of
indistinguishable particles, such as bosonic gases, is captured most
conveniently by second quantisation. This implies the possibility of non-local
correlations, such as entanglement, between modes of the field. In this paper
we propose an experimental scheme that tests the theoretically predicted
entanglement between modes in space occupied by massive bosons. Moreover, the
implementation of the proposed scheme is capable of proving that the particle
number superselection rule is not a fundamental necessity of quantum theory but
a consequence of not possessing a distinguished reference frame.
\\ ( , 84kb)
Date: Thu, 16 Oct 2008 13:51:09 GMT (55kb)

Title: Spectroscopy of Superradiant scattering from an array of Bose-Einstein
Authors: Xu Xu, Xiaoji Zhou, and Xuzong Chen
Categories: quant-ph
   We theoretically study the superradiant gain and the direction of this
coherent radiant for an array of Bose-Einstein condensates in an optical
lattice. We find that the density grating is formed to amplify the scattering
light within the phase match condition. The scattering spectroscopy in the
momentum space can provide a method for measuring the overlap of wavefunction
between the neighboring sites, which is related to their inner-site and
inter-site coherence.
\\ ( , 55kb)

The replacements:

replaced with revised version Fri, 10 Oct 2008 09:56:01 GMT (152kb)

Title: Mean-field dynamics of a non-Hermitian Bose-Hubbard dimer
Authors: E. M. Graefe, H. J. Korsch and A. E. Niederle
Categories: quant-ph cond-mat.other
Comments: 4 pages, 3 figures, published version
Journal-ref: Phys. Rev. Lett. 101, 150408 (2008)
DOI: 10.1103/PhysRevLett.101.150408
\\ ( , 152kb)
replaced with revised version Fri, 10 Oct 2008 15:23:16 GMT (197kb,D)

Title: Velocity Statistics Distinguish Quantum Turbulence from Classical
Authors: M.S. Paoletti, Michael E. Fisher, K.R. Sreenivasan, and D.P. Lathrop
Categories: cond-mat.stat-mech
Comments: 4 pages, 4 figures
Journal-ref: Physical Review Letters 101, 154501 (2008)
DOI: 10.1103/PhysRevLett.101.154501
\\ ( , 197kb)
replaced with revised version Fri, 10 Oct 2008 07:49:05 GMT (894kb)

Title: Dynamic optical lattices: two-dimensional rotating and accordion
   lattices for ultracold atoms
Authors: R. A. Williams, J. D. Pillet, S. Al-Assam, B. Fletcher, M. Shotter and
   C. J. Foot
Categories: quant-ph
Comments: 7 pages, 5 figures, final version
Journal-ref: Optics Express Vol 16, 21, 16977-16983 (2008)
\\ ( , 894kb)
replaced with revised version Fri, 10 Oct 2008 17:46:18 GMT (293kb)

Title: Aspects of quantum phase transitions
Authors: M. K. G. Kruse, H. G. Millerr, A. Plastino, A. R. Plastino
Categories: quant-ph cond-mat.stat-mech nucl-th
Comments: corrected typos
\\ ( , 293kb)
replaced with revised version Mon, 13 Oct 2008 17:21:23 GMT (245kb)

Title: Collisional stability of a three-component degenerate Fermi gas
Authors: T. B. Ottenstein, T. Lompe, M. Kohnen, A. N. Wenz and S. Jochim
Categories: cond-mat.other
\\ ( , 245kb)
replaced with revised version Mon, 13 Oct 2008 13:05:20 GMT (139kb)

Title: On the Quantum Phase Diagram of Bosons in Optical Lattices
Authors: Francisco Ednilson A. dos Santos and Axel Pelster
Categories: cond-mat.stat-mech
Comments: Phys. Rev. A (in press)
\\ ( , 139kb)
replaced with revised version Thu, 9 Oct 2008 22:30:17 GMT (1189kb)

Title: Probing a Bose-Einstein Condensate with an Atom Laser
Authors: D. D\"oring, N. P. Robins, C. Figl, and J. D. Close
Categories: physics.atom-ph
Comments: published version, 8 pages, 3 figures
DOI: 10.1364/OE.16.013893
\\ ( , 1189kb)
replaced with revised version Mon, 13 Oct 2008 18:14:23 GMT (2119kb,D)

Title: Adiabaticity and localization in one-dimensional incommensurate lattices
Authors: E. E. Edwards, M. Beeler, Tao Hong, and S. L. Rolston
Categories: physics.atom-ph
Comments: 4 pages, 3 figures; v2: figures improved (particularly fig 3), some
   refs. added, clarifications in discussion, fixed typos
\\ ( , 2119kb)
replaced with revised version Tue, 14 Oct 2008 15:56:00 GMT (121kb)

Title: On the Quantum Phase Diagram of Bosons in Optical Lattices
Authors: Francisco Ednilson A. dos Santos and Axel Pelster
Categories: cond-mat.stat-mech
Comments: Phys. Rev. A (in press)
\\ ( , 121kb)
replaced with revised version Tue, 14 Oct 2008 11:41:24 GMT (1062kb)

Title: Ultra-large Rydberg dimers in optical lattices
Authors: B. Vaucher, S. J. Thwaite, D. Jaksch
Categories: cond-mat.other
Comments: 10 pages, 6 figures, PRA format, version to be published in PRA
\\ ( , 1062kb)
replaced with revised version Wed, 15 Oct 2008 12:01:06 GMT (23kb)

Title: Entanglement of two distant Bose-Einstein condensates by detection of
   Bragg-scattered photons
Authors: B. Deb and G. S. Agarwal
Categories: quant-ph cond-mat.other
Comments: 9 pages, 5 figures
Journal-ref: Phys. Rev. A 78, 013639 (2008)
\\ ( , 23kb)
replaced with revised version Thu, 16 Oct 2008 12:42:58 GMT (31kb)

Title: Exact Ground State Energy of Hubbard Rings in the Atomic Limit
Authors: W. B. Hodge, N. A. W. Holzwarth, W. C. Kerr
Categories: cond-mat.str-el
Comments: 4 pages, 3 figure files for 2 figures
\\ ( , 31kb)
replaced with revised version Thu, 16 Oct 2008 07:34:54 GMT (469kb)

Title: A magnetic lens for cold atoms controlled by a rf field
Authors: E. Marechal (LPL), B. Laburthe-Tolra (LPL), L. Vernac (LPL), J. -C.
   Keller (LPL), O. Gorceix (LPL)
Categories: physics.atom-ph
Journal-ref: Applied Physics B Photophysics and Laser Chemistry 91, 3 (2008)
\\ ( , 469kb)

Till next time,

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
Matt's arXiv selection: weekly summary of cold-atom papers from
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Received on Wed Oct 29 2008 - 09:15:13 EST

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