[Matts-arxiv] Matt's arXiv selection: week ending 7 May 2010.

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Wed, 12 May 2010 16:03:52 +1000

Dear subscribers,

This email has been a long time coming for many different reasons generally
involving busy-ness. However, because I haven't been sending these emails I
haven't been keeping up to date with the literature, and this is Not A Good
Thing for me, let along anyone else.

I have decided to skip (for now at least) all the weeks that have been missed,
and start afresh. If you actually read this, I would appreciate hearing your
opinion if it is actually useful receiving these messages (and also if it is
worth going through the backlog). Feedback will give me extra motivation to
keep going and implement a more organised system to stay up-to-date.

This week's selection contains 41 new abstracts and 7 replacements.

arXiv:1004.4978 (*cross-listing*)
Date: Wed, 28 Apr 2010 09:02:42 GMT (37kb)

Title: Dynamics of atoms in a time-orbiting-potential trap: consequences of the
   classical description
Authors: Bruno Zambon (1), Roberto Franzosi(2) ((1) University of Pisa, Italy,
   (2) C.N.I.S.M. and University of Florence, Italy)
Categories: cond-mat.quant-gas nlin.CD quant-ph
Comments: 24 pages, 5 figures, regular article
Journal-ref: J. Phys. B: At. Mol. Opt. Phys. 43, 085302 (2010)
   The classical model that describes the motion of an atom in a magnetic trap
is solved in order to investigate the relationship between the failure of the
usual adiabatic approximation assumption and the physical parameters of the
trap. This allows to evaluate the effect that reversing of the bias field
rotation produces on the vertical position of the atomic orbit, a displacement
that is closely related to the adiabatic character of the trap motion. The
present investigation has been motivated by a similar experimental test
previously carried out in the actual magnetic time orbiting potential trap. We
find that the non-adiabatic effects provided by the classical model are
extremely small. Thus, we conclude that the theoretical explanation of the
experimental measures, requires a quantum description of the dynamics in
magnetic traps.
\\ ( http://arxiv.org/abs/1004.4978 , 37kb)
Date: Thu, 29 Apr 2010 20:18:07 GMT (440kb)

Title: S-matrix approach to quantum gases in the unitary limit II: the
   three-dimensional case
Authors: Pye-Ton How and Andr\'e LeClair
Categories: cond-mat.quant-gas hep-th math-ph math.MP
Comments: 26 pages, 16 figures
   A new analytic treatment of three-dimensional homogeneous Bose and Fermi
gases in the unitary limit of negative infinite scattering length is presented,
based on the S-matrix approach to statistical mechanics we recently developed.
The unitary limit occurs at a fixed point of the renormalization group with
dynamical exponent z=2 where the S-matrix equals -1. For fermions we find T_c
/T_F is approximately 0.1. For bosons we present evidence that the gas does not
collapse, but rather has a critical point that is a strongly interacting form
of Bose-Einstein condensation. This bosonic critical point occurs at n lambda^3
approximately 1.3 where n is the density and lambda the thermal wavelength,
which is lower than the ideal gas value of 2.61.
\\ ( http://arxiv.org/abs/1004.5390 , 440kb)
arXiv:1004.5420 (*cross-listing*)
Date: Thu, 29 Apr 2010 23:18:56 GMT (430kb,D)

Title: Universal rates for reactive ultracold polar molecules in reduced
Authors: Andrea Micheli, Zbigniew Idziaszek, Guido Pupillo, Mikhail A. Baranov,
   Peter Zoller, and Paul S. Julienne
Categories: physics.atom-ph cond-mat.quant-gas quant-ph
Comments: 4 pages, 3 figures
   Analytic expressions describe universal elastic and reactive rates of
quasi-two-dimensional and quasi-one-dimensional collisions of highly reactive
ultracold molecules interacting by a van der Waals potential. Exact and
approximate calculations for the example species of KRb show that stability and
evaporative cooling can be realized for spin-polarized fermions at moderate
dipole and trapping strength, whereas bosons or unlike fermions require
significantly higher dipole or trapping strengths.
\\ ( http://arxiv.org/abs/1004.5420 , 430kb)
Date: Fri, 30 Apr 2010 03:22:54 GMT (97kb)

Title: Mean-field study of itinerant ferromagnetism in trapped ultracold Fermi
   gases: Beyond the local density approximation
Authors: H Dong, Hui Hu, Xia-Ji Liu, and Peter D. Drummond
Categories: cond-mat.quant-gas
Comments: 7 pages, 5 figures;
   We theoretically investigate the itinerant ferromagnetic transition of a
spherically trapped ultracold Fermi gas with spin imbalance under strongly
repulsive interatomic interactions. Our study is based on a self-consistent
solution of the Hartree-Fock mean-field equations beyond the widely used local
density approximation. We demonstrate that, while the local density
approximation holds in the paramagnetic phase, after the ferromagnetic
transition it leads to a quantitative discrepancy in various thermodynamic
quantities even with large atom numbers. We determine the position of the phase
transition by monitoring the shape change of the free energy curve with
increasing the polarization at various interaction strengths.
\\ ( http://arxiv.org/abs/1004.5443 , 97kb)
Date: Fri, 30 Apr 2010 07:33:30 GMT (1790kb)

Title: Quantized vortices in superfluid helium and atomic Bose-Einstein
Authors: Makoto Tsubota, Kenichi Kasamatsu, Michikazu Kobayashi
Categories: cond-mat.quant-gas
Comments: 99 pages, 20 figures, Review article
   This article reviews recent developments in the physics of quantized vortices
in superfluid helium and atomic Bose-Einstein condensates. Quantized vortices
appear in low-temperature quantum condensed systems as the direct product of
Bose-Einstein condensation. Quantized vortices were first discovered in
superfluid 4He in the 1950s, and have since been studied with a primary focus
on the quantum hydrodynamics of this system. Since the discovery of superfluid
3He in 1972, quantized vortices characteristic of the anisotropic superfluid
have been studied theoretically and observed experimentally using rotating
cryostats. The realization of atomic Bose-Einstein condensation in 1995 has
opened new possibilities, because it became possible to control and directly
visualize condensates and quantized vortices. Historically, many ideas
developed in superfluid 4He and 3He have been imported to the field of cold
atoms and utilized effectively. Here, we review and summarize our current
understanding of quantized vortices, bridging superfluid helium and atomic
Bose-Einstein condensates. This review article begins with a basic
introduction, which is followed by discussion of modern topics such as quantum
turbulence and vortices in unusual cold atom condensates.
\\ ( http://arxiv.org/abs/1004.5458 , 1790kb)
Date: Fri, 30 Apr 2010 08:40:45 GMT (242kb)

Title: Exciton condensation and fractional charge in a bilayer two-dimension
   electron gas adjacent to a superconductor film
Authors: Ningning Hao, Ping Zhang, Jian Li, Wei Zhang, Yupeng Wang
Categories: cond-mat.mes-hall
Comments: 4.6 pages, 3 figures
   We study the exciton condensate (EC) in a bilayer two-dimension-electron-gas
(2DEG) adjacent to a type-II superconductor thin film with an array of pinned
vortex lattices. By applying continuum low energy theory and carrying numerical
simulations of lattice model within mean-field approximation, we find that if
the order parameter of EC has a vortex profile, there are exact zero modes and
associated \emph{rational} fractional charge for zero pseudospin potential
($\mu$) and average chemical potential ($h$): $\mu$=0 and $h$=0; while for
$\mu\mathtt{\neq}0$ and $h$=0, intervalley mixing splits the zero energy
levels, and the system exhibits \emph{irrational} fractional \emph{axial}
\\ ( http://arxiv.org/abs/1004.5471 , 242kb)
Date: Fri, 30 Apr 2010 09:22:59 GMT (10kb)

Title: Microcanonical Entropy and Dynamical Measure of Temperature for Systems
   with Two First Integrals
Authors: Roberto Franzosi (C.N.I.S.M. and University of Florence, Italy)
Categories: cond-mat.stat-mech math-ph math.MP nlin.CD
Comments: 4 pages, preprint
   We consider a generic classical many particle system described by an
autonomous Hamiltonian $H(x^{_1},...,x^{_{N+2}})$ which, in addition, has a
conserved quantity $V(x^{_1},...,x^{_{N+2}})=v$, so that the Poisson bracket
$\{H,V \}$ vanishes. We derive in detail the microcanonical expressions for
entropy and temperature. We show that both of these quantities depend on
multidimensional integrals over submanifolds given by the intersection of the
constant energy hypersurfaces with those defined by
$V(x^{_1},...,x^{_{N+2}})=v$. We show that temperature and higher order
derivatives of entropy are microcanonical observable that, under the hypothesis
of ergodicity, can be calculated as time averages of suitable functions. We
derive the explicit expression of the function that gives the temperature.
\\ ( http://arxiv.org/abs/1004.5480 , 10kb)
Date: Fri, 30 Apr 2010 10:01:48 GMT (76kb)

Title: Ultrasensitive Atomic clock with single-mode number-squeezing
Authors: L. Pezze and A. Smerzi
Categories: quant-ph
Comments: 4 pages, 2 figures
   We show that the sensitivity of an atomic clock can be enhanced below the
shot-noise level by initially squeezing, and then measuring in output, the
population of a single atomic level. This can simplify current experimental
protocols which requires squeezing of the relative number of particles of the
two populated states. We finally study, as a specific application, the clock
sensitivity obtained with a single mode quantum non-demolition measurement.
\\ ( http://arxiv.org/abs/1004.5486 , 76kb)
Date: Fri, 30 Apr 2010 13:48:45 GMT (14kb)

Title: Superfluid-Insulator Transitions in Attractive Bose-Hubbard Model with
   Three-Body Constraint
Authors: Yu-Wen Lee and Min-Fong Yang
Categories: cond-mat.quant-gas
Comments: 4 pages, 2 figures
   By means of the method of the effective potential, the phase transitions from
the Mott insulating state to either the atomic or the dimer superfluid state in
the three-body constrained attractive Bose lattice gas are analyzed. Due to the
appearance of the Feshbach resonance coupling between the two kinds of order
parameters in the derived effective potential function, it is found that the
continuous Mott insulator-to-superfluid transitions can be preempted by
first-order ones. Since the employed approach can provide accurate predictions
of phase boundaries in the strong coupling limit, where the dimer superfluid
phase can emerge, our work hence sheds light on the search of this novel phase
in real ultracold Bose gases in optical lattices.
\\ ( http://arxiv.org/abs/1004.5531 , 14kb)
Date: Fri, 30 Apr 2010 16:15:17 GMT (60kb)

Title: Einstein's quantum theory of the monatomic ideal gas: non-statistical
   arguments for a new statistics
Authors: Enric P\'erez, Tilman Sauer
Categories: physics.hist-ph
Comments: 57 pp.
   In this article, we analyze the third of three papers, in which Einstein
presented his quantum theory of the ideal gas of 1924-1925. Although it failed
to attract the attention of Einstein's contemporaries and although also today
very few commentators refer to it, we argue for its significance in the context
of Einstein's quantum researches. It contains an attempt to extend and exhaust
the characterization of the monatomic ideal gas without appealing to
combinatorics. Its ambiguities illustrate Einstein's confusion with his initial
success in extending Bose's results and in realizing the consequences of what
later became to be called Bose-Einstein statistics. We discuss Einstein's
motivation for writing a non-combinatorial paper, partly in response to
criticism by his friend Ehrenfest, and we paraphrase its content. Its arguments
are based on Einstein's belief in the complete analogy between the
thermodynamics of light quanta and of material particles and invoke
considerations of adiabatic transformations as well as of dimensional analysis.
These techniques were well-known to Einstein from earlier work on Wien's
displacement law, Planck's radiation theory, and the specific heat of solids.
We also investigate the possible role of Ehrenfest in the gestation of the
\\ ( http://arxiv.org/abs/1004.5567 , 60kb)
Date: Fri, 30 Apr 2010 17:15:36 GMT (93kb)

Title: Candidate theories to explain the anomalous spectroscopic signatures of
   atomic H in molecular H$_2$ crystals
Authors: Kaden R. A. Hazzard and Erich J. Mueller
Categories: cond-mat.other cond-mat.dis-nn
Comments: 7 pages, 2 figures
   We analyze a number of proposed explanations for spectroscopic anomalies
observed in atomic hydrogen defects embedded in a solid molecular hydrogen
matrix. In particular, we critically evaluate the possibility that these
anomalies are related to Bose-Einstein condensation (both global and local).
For each proposed mechanism we discuss which aspects of the experiment can be
explained, and make predictions for future experiments.
\\ ( http://arxiv.org/abs/1004.5577 , 93kb)
Date: Fri, 30 Apr 2010 19:21:17 GMT (203kb)

Title: The devil's staircase in 1-dimensional dipolar Bose gases in optical
Authors: F. J. Burnell and S. L. Sondhi
Categories: cond-mat.str-el cond-mat.quant-gas
Comments: Chapter of doctoral thesis `On Exotic Orders in Strongly Correlated
   Systems' (Princeton University, 09/09). This presents a more detailed version
   of [PRB 80: 174519 (2009)] (arXiv:0901.4366)
   We consider a single-component gas of dipolar bosons confined in a
one-dimensional optical lattice, where the dipoles are aligned such that the
long-ranged dipolar interactions are maximally repulsive. In the limit of zero
inter-site hopping and sufficiently large on-site interaction, the phase
diagram is a complete devil's staircase for filling fractions between 0 and 1:
every commensurate state at a rational filling is stable over a finite interval
in chemical potential, and for every chemical potential the system is in a
gapped commensurate phase. We perturb away from this limit in two
experimentally motivated directions involving the addition of hopping and a
reduction of the onsite interaction. The addition of hopping alone yields a
phase diagram, which we compute in perturbation theory in the hopping, where
the commensurate Mott phases now compete with the superfluid. We capture the
physics of the Mott-superfluid phase transitions via bosonization. In a finite
trap, we argue using an LDA and simulated annealing that this results in
regions of commensurate states separated by patches with dominant superfluid
correlations. Further softening of the onsite interaction yields alternative
commensurate states with double occupancies which can form a devil's staircase
of their own; we describe these states and discuss the possible transitions
between them. Adding a hopping term in this case produces one-dimensional
"supersolids" which simultaneously exhibit discrete broken symmetries and
superfluidity. The contents of this work was first published as a chapter in
the doctoral thesis `On Exotic Orders in Strongly Correlated Systems'
(Princeton University, 09/09, supervised by S. L. Sondhi), and constitutes a
considerably more detailed version of [PRB 80: 174519 (2009)].
\\ ( http://arxiv.org/abs/1004.5595 , 203kb)
Date: Sat, 1 May 2010 13:11:05 GMT (679kb,D)

Title: Fiber Fabry-Perot cavity with high finesse
Authors: David Hunger, Tilo Steinmetz, Yves Colombe, Christian Deutsch, Theodor
   W. H\"ansch, Jakob Reichel
Categories: physics.optics quant-ph
Comments: Submitted to New J. Phys.
   We have realized a fiber-based Fabry-Perot cavity with CO2 laser-machined
mirrors. It combines very small size, high finesse F>=130000, small waist and
mode volume, and good mode matching between the fiber and cavity modes. This
combination of features is a major advance for cavity quantum electrodynamics
(CQED), as shown in recent CQED experiments with Bose-Einstein condensates
enabled by this cavity [Y. Colombe et al., Nature 450, 272 (2007)]. It should
also be suitable for a wide range of other applications, including coupling to
solid-state emitters, gas detection at the single-particle level, fiber-coupled
single-photon sources and high-resolution optical filters with large stopband.
\\ ( http://arxiv.org/abs/1005.0067 , 679kb)
Date: Sat, 1 May 2010 17:24:19 GMT (761kb)

Title: Mechanism of Tunneling in Interacting Open Ultracold Few-Boson Systems
Authors: Axel U. J. Lode, Alexej I. Streltsov, Ofir E. Alon, and Lorenz S.
Categories: cond-mat.quant-gas cond-mat.other quant-ph
Comments: 11 pages, 3 figures
   We investigate the mechanism in the tunneling dynamics of open ultracold
few-boson systems by numerically solving the time-dependent few-boson
Schr\"{o}dinger equation exactly. By starting from a weakly repulsive,
initially coherent two-boson system we demonstrate that the decay dynamics
incorporate fragmentation. The wavefunction of the tunneling state exhibits a
pronounced dynamically-stable pattern which we explain by an analytical model.
By studying more bosons and stronger interactions we arrive to the conclusion
that the decay by tunneling is not a coherent process and exhibits a wealth of
phenomena depending on the interaction between the particles.
\\ ( http://arxiv.org/abs/1005.0093 , 761kb)
arXiv:1005.0131 (*cross-listing*)
Date: Sun, 2 May 2010 09:40:36 GMT (9kb)

Title: The quantum vacuum at the foundations of classical electrodynamics
Authors: G. Leuchs (1 and 2), A. S. Villar (1 and 2), L. L. S\'anchez-Soto (1
   and 3) ((1) Max Planck Institut fuer die Physik des Lichts, Germany, (2)
   Institut fuer Optik, Information und Photonik, Universitaet
   Erlangen-Nuernberg, Germany, (3) Departamento de \'Optica, Facultad de
   F\'isica, Universidad Complutense, Spain)
Categories: quant-ph physics.class-ph
Comments: Comments on our manuscript are very welcome.
   In the classical theory of electromagnetism, the permittivity and the
permeability of free space are constants whose magnitudes do not seem to
possess any deeper physical meaning. By replacing the free space of classical
physics with the quantum notion of the vacuum, we speculate that the values of
the aforementioned constants could arise from the polarization and
magnetization of virtual pairs in vacuum. A classical dispersion model with
parameters determined by quantum and particle physics is employed to estimate
their values. We find the correct orders of magnitude. Additionally, our simple
assumptions yield an independent estimate for the number of charged elementary
particles based on the known values of the permittivity and the permeability,
and for the volume of a virtual pair. Such interpretation would provide an
intriguing connection between the celebrated theory of classical
electromagnetism and the quantum theory in the weak field limit.
\\ ( http://arxiv.org/abs/1005.0131 , 9kb)
Date: Sun, 2 May 2010 11:42:05 GMT (1441kb,D)

Title: Many-body phenomena in QED-cavity arrays
Authors: Andrea Tomadin and Rosario Fazio
Categories: cond-mat.str-el
Comments: 8 pages, 3 figures
Journal-ref: J. Opt. Soc. Am. B 27, A130 (2010)
DOI: 10.1364/JOSAB.27.00A130
   Coupled quantum electrodynamics (QED) cavities have been recently proposed as
new systems to simulate a variety of equilibrium and non-equilibrium many-body
phenomena. We present a brief review of their main properties together with a
survey of the last developments of the field and some perspectives concerning
their experimental realizations and possible new theoretical directions.
\\ ( http://arxiv.org/abs/1005.0137 , 1441kb)
Date: Mon, 3 May 2010 07:45:14 GMT (4044kb,D)

Title: Rubidium dimers in paraffin-coated cells
Authors: V. M. Acosta, A. Jarmola, D. Windes, E. Corsini, M. P. Ledbetter, T.
   Karaulanov, M. Auzinsh, S. A. Rangwala, D. F. Jackson Kimball, and D. Budker
Categories: physics.atom-ph
Comments: 5 pages, 2 figures
   Measurements were made to determine the density of rubidium dimer vapor in
paraffin-coated cells. The number density of dimers and atoms in similar
paraffin-coated and uncoated cells was measured by optical spectroscopy. Due to
the relatively low melting point of paraffin, a limited temperature range of
43-80 deg C was explored, with the lower end corresponding to a dimer density
of less than 10^7 cm^(-3). With one-minute integration time, a sensitivity to
dimer number density of better than 10^6 cm^(-3) was achieved. No significant
difference in dimer density was observed between the cells.
\\ ( http://arxiv.org/abs/1005.0215 , 4044kb)
Date: Mon, 3 May 2010 14:08:46 GMT (691kb,D)

Title: Local observation of antibunching in a trapped Fermi gas
Authors: Torben Mueller, Bruno Zimmermann, Jakob Meineke, Jean-Philippe
   Brantut, Tilman Esslinger, Henning Moritz
Categories: cond-mat.quant-gas quant-ph
Comments: 5 pages, 4 figures
   Local density fluctuations and density profiles of a Fermi gas are measured
in-situ and analyzed. In the quantum degenerate regime, the weakly interacting
$^6$Li gas shows a suppression of the density fluctuations compared to the
non-degenerate case, where atomic shot noise is observed. This manifestation of
antibunching is a direct result of the Pauli principle and constitutes a local
probe of quantum degeneracy. We analyze our data using the predictions of the
fluctuation-dissipation theorem and the local density approximation,
demonstrating a fluctuation-based temperature measurement.
\\ ( http://arxiv.org/abs/1005.0302 , 691kb)
Date: Mon, 3 May 2010 17:54:21 GMT (513kb)

Title: Comparison between two mobile absolute gravimeters: optical versus
   atomic interferometers
Authors: S. Merlet, Q. Bodart, N. Malossi, A. Landragin, F. Pereira Dos Santos,
   O. Gitlein, L. Timmen
Categories: physics.atom-ph physics.geo-ph
   We report a comparison between two absolute gravimeters: the LNE-SYRTE cold
atoms gravimeter and FG5#220 of Leibniz Universit\"at of Hannover. They rely on
different principles of operation: atomic and optical interferometry. Both are
movable which enabled them to participated to the last International Comparison
of Absolute Gravimeters (ICAG'09) at BIPM. Immediately after, their bilateral
comparison took place in the LNE watt balance laboratory and showed an
agreement of 4.3 +/- 6.4 {\mu}Gal.
\\ ( http://arxiv.org/abs/1005.0357 , 513kb)
Date: Mon, 3 May 2010 20:11:00 GMT (5810kb)

Title: Introduction to Nonequilibrium Statistical Mechanics with Quantum Field
Authors: Takafumi Kita
Categories: cond-mat.stat-mech hep-ph math-ph math.MP nucl-th
Comments: 78 pages, 14 figures, invited paper (free access) of Prog. Theor.
   Phys. http://ptp.ipap.jp/link?PTP/123/581/
Journal-ref: Prog. Theor. Phys. 123 (2010) 581-658
DOI: 10.1143/PTP.123.581
   In this article, we present a concise and self-contained introduction to
nonequilibrium statistical mechanics with quantum field theory by considering
an ensemble of interacting identical bosons or fermions as an example. Readers
are assumed to be familiar with the Matsubara formalism of equilibrium
statistical mechanics such as Feynman diagrams, the proper self-energy, and
Dyson's equation. The aims are threefold: (i) to explain the fundamentals of
nonequilibrium quantum field theory as simple as possible on the basis of the
knowledge of the equilibrium counterpart; (ii) to elucidate the hierarchy in
describing nonequilibrium systems from Dyson's equation on the Keldysh contour
to the Navier-Stokes equation in fluid mechanics via quantum transport
equations and the Boltzmann equation; (iii) to derive an expression of
nonequilibrium entropy that evolves with time. In stage (i), we introduce
nonequilibrium Green's function and the self-energy uniquely on the round-trip
Keldysh contour, thereby avoiding possible confusions that may arise from
defining multiple Green's functions at the very beginning. We try to present
the Feynman rules for the perturbation expansion as simple as possible. In
particular, we focus on the self-consistent perturbation expansion with the
Luttinger-Ward thermodynamic functional, i.e., Baym's Phi-derivable
approximation, which has a crucial property for nonequilibrium systems of
obeying various conservation laws automatically. We also show how the
two-particle correlations can be calculated within the Phi-derivable
approximation, i.e., an issue of how to handle the
"Bogoliubov-Born-Green-Kirkwood-Yvons (BBGKY) hierarchy".
\\ ( http://arxiv.org/abs/1005.0393 , 5810kb)
Date: Tue, 4 May 2010 02:01:30 GMT (2577kb)

Title: An Artificial Frustrated System: Cold Atoms in Triangular Optical
Authors: Yao-Hua Chen, Wei Wu, Hong-Shuai Tao, and Wu-Ming Liu
Categories: cond-mat.quant-gas
   We investigate the strongly correlated effect of cold atoms in triangular
optical lattice by dynamical cluster approximation combining with the
continuous time quantum Monte Carlo method proposed recently. It is found the
double occupancy is suppressed as the atomic interaction increases. By
calculating the density of states, we show how the system evolves from Fermi
liquid with an obvious quasi-particle peak into Mott insulator with an opened
gap for increasing interaction. The transition between Fermi liquid and
pseudogap shows a reentrant behavior due to the Kondo effect. At low
temperature, a Kondo peak appears before the splitting of the Fermi-liquid-like
peak. The Fermi surface evolves from a circular ring with high amplitude into a
{\deg}at elliptical ring with low amplitude for the increasing interaction. We
give an experimental protocol to observe these phenomena by varying the lattice
depth and the atomic interaction via Feshbach resonance in future experiments.
\\ ( http://arxiv.org/abs/1005.0428 , 2577kb)
Date: Tue, 4 May 2010 08:04:21 GMT (695kb)

Title: Interacting multi-component exciton gases in a potential trap: phase
   separation and Bose-Einstein condensation
Authors: S. Sobkowiak, D. Semkat, H. Stolz, Th. Koch, and H. Fehske
Categories: cond-mat.quant-gas
Comments: 7 pages, 6 figures
   The system under consideration is a multi-component gas of interacting para-
and orthoexcitons confined in a three dimensional potential trap. We calculate
the spatially resolved optical emission spectrum due to interband transitions
involving weak direct and phonon mediated exciton-photon interactions. For each
component, the occurrence of a Bose-Einstein condensate changes the spectrum in
a characteristic way so that it directly reflects the constant chemical
potential of the excitons and the renormalization of the quasiparticle
excitation spectrum. Moreover, the interaction between the components leads, in
dependence on temperature and particle number, to modifications of the spectra
indicating phase separation of the subsystems. Typical examples of density
profiles and luminescence spectra of ground-state para- and orthoexcitons in
cuprous oxide are given.
\\ ( http://arxiv.org/abs/1005.0458 , 695kb)
Date: Tue, 4 May 2010 08:12:37 GMT (52kb)

Title: Fermi super-Tonks-Girardeau gas in a spin-1/2 interacting Fermi system
Authors: Liming Guan and Shu Chen
Categories: cond-mat.quant-gas
Comments: 4 pages, 4 figures
   The Fermi gases confined in tight one-dimensional waveguides would form
two-particle bound states of atoms in the presence of a strongly attractive
interaction. Based on the exact solution of the one-dimensional spin-1/2
interacting Fermi gas, we demonstrate that a stable excited state with no
pairing between attractive fermionic atoms can be realized by a sudden switch
of interaction from strongly repulsive regime to the strongly attractive
regime. Such a state is an exact fermionic analog of the experimentally
observed super-Tonks-Girardeau state of bosonic Cesium atoms [Science 325, 1224
(2009)] and should be possible to be observed by the experiment. We also show
that the Fermi super-Tonks-Girardeau state can be realized in the
multi-component Fermi gas.
\\ ( http://arxiv.org/abs/1005.0461 , 52kb)
Date: Tue, 4 May 2010 08:22:07 GMT (22kb)

Title: Mott Insulator to Superfluid transition in Bose-Bose mixtures in a
   two-dimensional lattice
Authors: M. Guglielmino, V. Penna and B. Capogrosso-Sansone
Categories: cond-mat.quant-gas
Comments: 4 pages, 3 figures, submitted to PRA
   We perform a numeric study (Worm algorithm Monte Carlo simulations) of
ultracold two-component bosons in two-dimensional optical lattices. We study
how the Mott insulator to superfluid transition is affected by the presence of
a second superfluid bosonic species. We find that, at fixed interspecies
interaction, the upper and lower boundaries of the Mott lobe are differently
modified. The lower boundary is strongly renormalized even for relatively low
filling factor of the second component and moderate (interspecies) interaction.
The upper boundary, instead, is affected only for large enough filling of the
second component. Whereas boundaries are renormalized we find evidence of
polaron-like excitations. Our results are of interest for current experimental
\\ ( http://arxiv.org/abs/1005.0463 , 22kb)
Date: Tue, 4 May 2010 09:46:54 GMT (1021kb)

Title: Geometric scale invariance as a route to macroscopic degeneracy: loading
   a toroidal trap with a Bose or Fermi gas
Authors: D. Baillie, P. B. Blakie, and A. S. Bradley
Categories: cond-mat.quant-gas
Comments: 13 pages, 6 figures.
   An easily scalable toroidal geometry presents an opportunity for creating
large scale persistent currents in Bose-Einstein condensates, for studies of
the Kibble-Zurek mechanism, and for investigations of toroidally trapped
degenerate Fermi gases. We consider in detail the process of isentropic loading
of a Bose or Fermi gas from a harmonic trap into the scale invariant toroidal
regime that exhibits a high degree of system invariance when increasing the
radius of the toroid. The heating involved in loading a Bose gas is evaluated
analytically and numerically, both above and below the critical temperature.
Our numerical calculations treat interactions within the
Hartree-Fock-Bogoliubov-Popov theory. Minimal change in degeneracy is observed
over a wide range of initial temperatures, and a regime of cooling is
identified. The scale invariant property is further investigated analytically
by studying the density of states of the system, revealing the robust nature of
scale invariance in this trap, for both bosons and fermions. We give analytical
results for a Thomas-Fermi treatment. We calculate the heating due to loading a
spin-polarized Fermi gas and compare with analytical results for high and low
temperature regimes. The Fermi gas is subjected to irreducible heating during
loading, caused by the loss of one degree of freedom for thermalization.
\\ ( http://arxiv.org/abs/1005.0473 , 1021kb)
arXiv:1005.0485 (*cross-listing*)
Date: Tue, 4 May 2010 10:23:33 GMT (341kb,D)

Title: The crossover from strong to weak chaos for nonlinear waves in
   disordered systems
Authors: T.V. Laptyeva, J.D. Bodyfelt, D.O. Krimer, Ch. Skokos, S. Flach
Categories: nlin.CD cond-mat.dis-nn
Comments: 4 pages, 2 figures. Submitted to Phys. Rev. Lett.
   We observe a crossover from strong to weak chaos in the evolution of multiple
site excitations within disordered chains with cubic nonlinearity. Recent
studies have shown that Anderson localization is destroyed, and the wave packet
spreading is characterized by an asymptotic divergence of the second moment in
time, as t^(1/3). In the present paper, we observe the existence of a
qualitatively new dynamical regime in which the second moment spreads even
faster [ as t^(1/2) ], with a crossover to the asymptotic t^(1/3) law at larger
times. We analyze the pecularities of these spreading regimes and perform
extensive numerical simulations over large times with ensemble averaging. A
novel technique of local derivatives on logarithmic scales is developed in
order to quantitatively visualize the slow crossover processes.
\\ ( http://arxiv.org/abs/1005.0485 , 341kb)
Date: Tue, 4 May 2010 15:06:21 GMT (988kb,D)

Title: Super Stability of Laminar Vortex Flow in Superfluid 3He-B
Authors: V.B. Eltsov, R. de Graaf, P.J. Heikkinen, J.J. Hosio, R. Hanninen, M.
   Krusius, and V.S. L'vov
Categories: cond-mat.other
Comments: 4 pages, 6 figures
   Vortex flow remains laminar up to large Reynolds numbers (Re~1000) in a
cylinder filled with 3He-B. This is inferred from NMR measurements and
numerical vortex filament calculations where we study the spin up and spin down
responses of the superfluid component, after a sudden change in rotation
velocity. In normal fluids and in superfluid 4He these responses are turbulent.
In 3He-B the vortex core radius is much larger which reduces both surface
pinning and vortex reconnections, the phenomena, which enhance vortex bending
and the creation of turbulent tangles. Thus the origin for the greater
stability of vortex flow in 3He-B is a quantum phenomenon. Only large flow
perturbations are found to make the responses turbulent, such as the walls of a
cubic container or the presence of invasive measuring probes inside the
\\ ( http://arxiv.org/abs/1005.0546 , 988kb)
Date: Tue, 4 May 2010 18:35:50 GMT (554kb)

Title: Spin squeezing of high-spin, spatially extended quantum fields
Authors: Jay D. Sau, S. R. Leslie, Marvin L. Cohen, and D. M. Stamper-Kurn
Categories: cond-mat.quant-gas quant-ph
Comments: 18 pages, 5 figures
   Investigations of spin squeezing in ensembles of quantum particles have been
limited primarily to a subspace of spin fluctuations and a single spatial mode
in high-spin and spatially extended ensembles. Here, we show that a wider range
of spin-squeezing is attainable in ensembles of high-spin atoms, characterized
by sub-quantum-limited fluctuations in several independent planes of
spin-fluctuation observables. Further, considering the quantum dynamics of an
$f=1$ ferromagnetic spinor Bose-Einstein condensate, we demonstrate
theoretically that a high degree of spin squeezing is attained in multiple
spatial modes of a spatially extended quantum field, and that such squeezing
can be extracted from spatially resolved measurements of magnetization and
nematicity, i.e.\ the vector and quadrupole magnetic moments, of the quantum
gas. Taking into account several experimental limitations, we predict that the
variance of the atomic magnetization and nematicity may be reduced as far as 20
dB below the standard quantum limits.
\\ ( http://arxiv.org/abs/1005.0603 , 554kb)
Date: Tue, 4 May 2010 21:44:25 GMT (413kb)

Title: Spin-supersolid versus phase separation in frustrated antiferromagnets
Authors: A. Fabricio Albuquerque, Nicolas Laflorencie, Jean-David Picon and
   Fr\'ed\'eric Mila
Categories: cond-mat.str-el
Comments: 6 pages, 6 figures
   We investigate the possibility to stabilize spin-supersolidity in a
frustrated $S=1/2$ Heisenberg model of weakly coupled dimers, with special
emphasis on its competition with phase separation. This study is based on
effective models derived with the contractor renormalization (CORE) algorithm
and studied with a self-consistent cluster mean-field theory, complemented by
an investigation of phase separation based on a "leapfrog mechanism". A region
of stable supersolidity is identified at intermediate frustration. However, at
strong frustration, supersolidity is found to be unstable towards phase
separation, in contradiction with recent results based on a tensor-product
algorithm. The reliability of the present approach is demonstrated in the
context of a non-frustrated, anisotropic version of the model for which
extensive Quantum Monte Carlo simulations have been performed. Finally, to
guide the search for experimenral realizations of supersolidity in Mott
insulators, the full phase diagram as a function of frustation and magnetic
field is derived.
\\ ( http://arxiv.org/abs/1005.0638 , 413kb)
Date: Wed, 5 May 2010 00:16:26 GMT (1659kb)

Title: Exact solution for quantum dynamics of a periodically-driven
Authors: Anirban Gangopadhyay, Maxim Dzero, and Victor Galitski
Categories: cond-mat.mtrl-sci quant-ph
Comments: 13 pages, 7 EPS figures
   We present a family of exact analytic solutions for non-linear quantum
dynamics of a two-level system (TLS) subject to a periodic-in-time external
field. In constructing the exactly solvable models, we use a "reverse
engineering" approach where the form of external perturbation is chosen to
preserve an integrability constraint, which yields a single non-linear
differential equation for the ac-field. A solution to this equation is
expressed in terms of Jacobi elliptic functions with three independent
parameters that allows one to choose the frequency, average value, and
amplitude of the time-dependent field at will. This form of the ac-drive is
especially relevant to the problem of dynamics of TLS charge defects that cause
dielectric losses in superconducting qubits. We apply our exact results to
analyze non-linear dielectric response of such TLSs and show that the position
of the resonance peak in the spectrum of the relevant correlation function is
determined by the quantum-mechanical phase accumulated by the TLS wave-function
over a time evolution cycle. It is shown that in the non-linear regime, this
resonance frequency may be shifted strongly from the value predicted by the
canonical TLS model. We also analyze the "spin" survival probability in the
regime of strong external drive and recover a coherent destruction of tunneling
phenomenon within our family of exact solutions, which manifests itself as a
strong suppression of "spin-flip" processes and suggests that such non-linear
dynamics in LC-resonators may lead to lower losses.
\\ ( http://arxiv.org/abs/1005.0652 , 1659kb)
Date: Wed, 5 May 2010 01:04:17 GMT (827kb)

Title: Metastable Quantum Phase Transitions in a One-Dimensional Bose Gas
Authors: Lincoln D. Carr, Rina Kanamoto, and Masahito Ueda
Categories: cond-mat.quant-gas cond-mat.mes-hall
Comments: 33 pages, 12 figures, book will appear later this year
Journal-ref: Chap. 13 in "Understanding Quantum Phase Transitions", ed. Lincoln
   D. Carr (Taylor & Francis, Boca Raton, 2010)
   This is a chapter for a book. The first paragraph of this chapter is as
follows: "Ultracold quantum gases offer a wonderful playground for quantum many
body physics, as experimental systems are widely controllable, both statically
and dynamically. One such system is the one-dimensional (1D) Bose gas on a
ring. In this system binary contact interactions between the constituent
bosonic atoms, usually alkali metals, can be controlled in both sign and
magnitude; a recent experiment has tuned interactions over seven orders of
magnitude, using an atom-molecule resonance called a Feshbach resonance. Thus
one can directly realize the Lieb-Liniger Hamiltonian, from the weakly- to the
strongly-interacting regime. At the same time there are a number of experiments
utilizing ring traps. The ring geometry affords us the opportunity to study
topological properties of this system as well; one of the main properties of a
superfluid is the quantized circulation in which the average angular momentum
per particle, L/N, is quantized under rotation. Thus we focus on a tunable 1D
Bose system for which the main control parameters are interaction and rotation.
We will show that there is a critical boundary in the interaction-rotation
control-parameter plane over which the topological properties of the system
change. This is the basis of our concept of \textit{metastable quantum phase
transitions} (QPTs). Moreover, we will show that the finite domain of the ring
is necessary for the QPT to occur at all because the zero-point kinetic
pressure can induce QPTs, i.e., the system must be finite; we thus seek to
generalize the concept of QPTs to inherently finite, mesoscopic or nanoscopic
\\ ( http://arxiv.org/abs/1005.0656 , 827kb)
Date: Wed, 5 May 2010 04:21:22 GMT (1368kb)

Title: Density oscillations in trapped dipolar condensates
Authors: H.-Y. Lu, H. Lu, J.-N. Zhang, R.-Z. Qiu, H. Pu, and S. Yi
Categories: cond-mat.quant-gas
Comments: 7 pages, 9 figures
   We investigated the ground state wave function and free expansion of a
trapped dipolar condensate. We find that dipolar interaction may induce both
biconcave and dumbbell density profiles in, respectively, the pancake- and
cigar-shaped traps. On the parameter plane of the interaction strengths, the
density oscillation occurs only when the interaction parameters fall into
certain isolated areas. The relation between the positions of these areas and
the trap geometry is explored. By studying the free expansion of the condensate
with density oscillation, we show that the density oscillation is detectable
from the time-of-flight image.
\\ ( http://arxiv.org/abs/1005.0666 , 1368kb)
Date: Wed, 5 May 2010 04:36:31 GMT (66kb)

Title: Degenerate Fermi Gas of $^{87}$Sr
Authors: B. J. DeSalvo, M. Yan, P. G. Mickelson, Y. N. Martinez de Escobar, and
   T. C. Killian
Categories: cond-mat.quant-gas
Comments: 4 pages, 3 figures
   We report quantum degeneracy in a gas of ultra-cold fermionic $^{87}$Sr
atoms. By evaporatively cooling a mixture of spin states in an optical dipole
trap for 10.5\,s, we obtain samples well into the degenerate regime with
$T/T_F=0.26^{+.05}_{-.06}$. The main signature of degeneracy is a change in the
momentum distribution as measured by time-of-flight imaging, and we also
observe a decrease in evaporation efficiency below $T/T_F \sim 0.5$.
\\ ( http://arxiv.org/abs/1005.0668 , 66kb)
Date: Wed, 5 May 2010 14:16:37 GMT (622kb)

Title: Statistical Mechanics of Floquet Systems with Regular and Chaotic States
Authors: Roland Ketzmerick and Waltraut Wustmann
Categories: cond-mat.stat-mech nlin.CD quant-ph
Comments: 17 pages, 11 figures
   We investigate the asymptotic state of time-periodic quantum systems with
regular and chaotic Floquet states weakly coupled to a heat bath. The
asymptotic occupation probabilities of these two types of states follow
fundamentally different distributions. Among regular states the probability
decreases from the state in the center of a regular island to the outermost
state by orders of magnitude, while chaotic states have almost equal
probabilities. We derive an analytic expression for the occupations of regular
states of kicked systems, which depends on the winding numbers of the regular
tori and the parameters temperature and driving frequency. For weakly variable
winding numbers within a regular island it simplifies to Boltzmann-like weights
$\exp(-\betaeff \Ereg_m)$, similar as in time-independent systems. For this we
introduce the regular energies $\Ereg_m$ of the quantizing tori and an
effective, winding number dependent temperature $1/\betaeff$, different from
the actual bath temperature. Furthermore, the occupations of other typical
Floquet states in a mixed phase space are studied, i.e. regular states on
nonlinear resonances, beach states, and hierarchical states, giving rise to
distinct features in the occupation distribution. In the presence of avoided
crossings we demonstrate drastic consequences for the occupations of regular
states. We introduce a simplified rate model whose analytic solutions describe
the occupations quite accurately.
\\ ( http://arxiv.org/abs/1005.0757 , 622kb)
arXiv:1005.0866 (*cross-listing*)
Date: Wed, 5 May 2010 23:15:00 GMT (909kb)

Title: Intensity fluctuations in steady state superradiance
Authors: D. Meiser and M. J. Holland
Categories: quant-ph cond-mat.quant-gas physics.atom-ph
Comments: 8 pages, 5 figures
   Alkaline-earth like atoms with ultra-narrow optical transitions enable
superradiance in steady state. The emitted light promises to have an
unprecedented stability with a linewidth as narrow as a few millihertz. In
order to evaluate the potential usefulness of this light source as an
ultrastable oscillator in clock and precision metrology applications it is
crucial to understand the noise properties of this device. In this paper we
present a detailed analysis of the intensity fluctuations by means of
Monte-Carlo simulations and semi-classical approximations. We find that the
light exhibits bunching below threshold, is to a good approximation coherent in
the superradiant regime, and is chaotic above the second threshold.
\\ ( http://arxiv.org/abs/1005.0866 , 909kb)
Date: Thu, 6 May 2010 05:59:41 GMT (123kb)

Title: The $j$-triplet Cooper pairing with magnetic dipolar interactions
Authors: Yi Li and Congjun Wu
Categories: cond-mat.quant-gas cond-mat.supr-con
   We study the Cooper pairing problem in the two component ultra-cold fermion
systems with magnetic dipolar interactions. Novel $p$-wave spin triplet
$(l=s=1)$ pairing phases are identified, which are markedly different from the
superfluid $^3$He-$A$ and $B$ phases. Orbital and spin angular momenta of
Cooper pairs are entangled into the channel of total angular momentum $j=1$.
Two possible pairing configurations include the unitary helical polar pairing
$(j_z = 0)$ and the non-unitary axial pairing $(j_z = 1)$. The polar pairing
preserves time-reversal symmetry, while the axial pairing breaks it. In the
weak coupling mean-field theory, the helical polar pairing wins over the axial
\\ ( http://arxiv.org/abs/1005.0889 , 123kb)
Date: Thu, 6 May 2010 06:01:08 GMT (1506kb,D)

Title: Matter waves in the Talbot-Lau interferometry
Authors: Valeriy I. Sbitnev
Categories: quant-ph
Comments: 13 pages, 14 figures
   Paths of particles, emitted from distributed sources of the particles and
passing out through slits of gratings G_0 and G_1 up to detectors, have been
computed in details by the path integral method. Matter-waves computed by this
method show perfect interference pattern both between the gratings and behind
the second grating. Emergence of the Talbot carpet represents a control test of
the computations. Computations of the interference patterns have been carried
out for two cases: (a) small amount of slits in the gratings; and (b) large
amount of slits. In the last case interference fringes of high order arise.
They are induced by interference of waves from extra lateral slits. Paraxial
approximation stems from the formulas at removing the distributed sources to
   As model particles we choose here fullerene molecules. De Broglie wavelength
of the molecules is adopted equal to 5 pm. PACS numbers: {03.75.-b, 03.75.Dg,
\\ ( http://arxiv.org/abs/1005.0890 , 1506kb)
Date: Thu, 6 May 2010 07:52:09 GMT (2790kb,D)

Title: Disorder and interference: localization phenomena
Authors: Cord A. Mueller (CQT, Singapore) and Dominique Delande (LKB, Paris)
Categories: cond-mat.dis-nn cond-mat.quant-gas quant-ph
Comments: Notes of a lecture delivered at the Les Houches School of Physics in
   Singapore on "Ultracold gases and quantum information" in 2009.
   The specific problem we address in these lectures is the problem of transport
and localization in disordered systems, when interference is present, as
characteristic for waves, with a focus on realizations with ultracold atoms.
\\ ( http://arxiv.org/abs/1005.0915 , 2790kb)
Date: Thu, 6 May 2010 12:26:18 GMT (6kb)

Title: Bogoliubov's Vision and Modern Theoretical Physics
Authors: A.L. Kuzemsky
Categories: physics.hist-ph
Comments: 6 pages
   A brief survey of the author's works on the fundamental conceptual ideas of
quantum statistical physics developed by N. N. Bogoliubov and his school was
given. The development and applications of the method of quasiaverages to
quantum statistical physics and condensed matter physics were analyzed. The
relationship with the concepts of broken symmetry, quantum protectorate and
emergence was examined, and the progress to date towards unified understanding
of complex many-particle systems was summarized. Current trends for extending
and using these ideas in quantum field theory and condensed matter physics were
discussed, including microscopic theory of superfluidity and superconductivity,
quantum theory of magnetism of complex materials, Bose-Einstein condensation,
chirality of molecules, etc.
\\ ( http://arxiv.org/abs/1005.0987 , 6kb)
arXiv:1005.1061 (*cross-listing*)
Date: Thu, 6 May 2010 19:35:58 GMT (705kb)

Title: Nonlinearity from quantum mechanics: Dynamically unstable Bose-Einstein
   condensate in a double-well trap
Authors: Juha Javanainen
Categories: quant-ph cond-mat.quant-gas
Comments: very close to published version
Journal-ref: Phys. Rev. A 81, 051602(R) (2010)
DOI: 10.1103/PhysRevA.81.051602
   We study theoretically an atomic Bose-Einstein condensate in a double-well
trap both quantum mechanically and classically under conditions such that in
the classical model an unstable equilibrium dissolves into large-scale
oscillations of the atoms between the potential wells. Quantum mechanics alone
does not exhibit such nonlinear dynamics, but measurements of the atom numbers
in the potential wells may nevertheless cause the condensate to behave
essentially classically.
\\ ( http://arxiv.org/abs/1005.1061 , 705kb)

The replacements:

replaced with revised version Sat, 1 May 2010 02:55:41 GMT (190kb)

Title: Isentropes of spin-1 bosons in an optical lattice
Authors: K. W. Mahmud, G. G. Batrouni, R. T. Scalettar
Categories: cond-mat.quant-gas cond-mat.stat-mech
Comments: 8 pages, 8 figures, Revised version
Journal-ref: Phys. Rev. A 81, 033609 (2010)
\\ ( http://arxiv.org/abs/0910.1114 , 190kb)
replaced with revised version Sat, 1 May 2010 14:28:21 GMT (55kb)

Title: Comparative study of theoretical methods for nonequilibrium quantum
Authors: J. Eckel, F. Heidrich-Meisner, S.G. Jakobs, M. Thorwart, M. Pletyukhov
   and R. Egger
Categories: cond-mat.mes-hall quant-ph
Comments: 19 pages, 7 figures; published version
Journal-ref: New. J. Phys. 12, 043042 (2010)
\\ ( http://arxiv.org/abs/1001.3773 , 55kb)
replaced with revised version Thu, 6 May 2010 15:29:43 GMT (67kb)

Title: Phase separation of trapped spin-imbalanced Fermi gases in
   one-dimensional optical lattices
Authors: F. Heidrich-Meisner, G. Orso, A. Feiguin
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 7 pages Revtex4, 9 eps figures; version as published, minor revisions
Journal-ref: Phys. Rev. A. 81, 053602 (2010)
DOI: 10.1103/PhysRevA.81.053602
\\ ( http://arxiv.org/abs/1001.4720 , 67kb)
replaced with revised version Mon, 3 May 2010 16:22:30 GMT (504kb)

Title: Sub-Fourier characteristics of a $\delta$-kicked rotor resonance
Authors: I. Talukdar, R. Shrestha, G. S. Summy
Categories: physics.atom-ph
Comments: 4 pages, 5 figures
\\ ( http://arxiv.org/abs/1004.0683 , 504kb)
arXiv:quant-ph/0610166 (*cross-listing*)
replaced with revised version Wed, 5 May 2010 00:16:40 GMT (343kb)

Title: Dynamical Realization of Macroscopic Superposition States of Cold Bosons
   in a Tilted Double Well
Authors: Lincoln D. Carr, D. R. Dounas-Frazer, and Miguel-\'Angel
Categories: quant-ph cond-mat.other
Comments: 6 pages, 5 figures, final version, only minor changes from previous
   arXiv version
Journal-ref: Europhys. Lett., v. 90, p. 10005 (2010)
DOI: 10.1209/0295-5075/90/10005
\\ ( http://arxiv.org/abs/quant-ph/0610166 , 343kb)
replaced with revised version Mon, 3 May 2010 04:34:28 GMT (209kb)

Title: Quantum phases, Supersolids and quantum phase transitions of interacting
   bosons in frustrated lattices
Authors: Yan Chen and Jinwu Ye
Categories: cond-mat.str-el cond-mat.mtrl-sci math-ph math.MP
Comments: REVTEX4, 20 PRB pages, 25 eps figures
\\ ( http://arxiv.org/abs/cond-mat/0612009 , 209kb)
replaced with revised version Wed, 5 May 2010 00:16:40 GMT (343kb)

Title: Dynamical Realization of Macroscopic Superposition States of Cold Bosons
   in a Tilted Double Well
Authors: Lincoln D. Carr, D. R. Dounas-Frazer, and Miguel-\'Angel
Categories: quant-ph cond-mat.other
Comments: 6 pages, 5 figures, final version, only minor changes from previous
   arXiv version
Journal-ref: Europhys. Lett., v. 90, p. 10005 (2010)
DOI: 10.1209/0295-5075/90/10005
\\ ( http://arxiv.org/abs/quant-ph/0610166 , 343kb)

Till next time,

Dr M. J. Davis,                      Associate Professor in Physics
School of Mathematics and Physics,   ph  : +61 7 334 69824
The University of Queensland,        fax : +61 7 336 51242
Brisbane, QLD 4072,                  mdavis_at_physics.uq.edu.au
Australia.                           www.physics.uq.edu.au/people/mdavis/
Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org
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