[Matts-arxiv] REPOST: Matt's arXiv selection: week ending 9 July 2010

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Tue, 7 Sep 2010 23:30:12 +1000

Dear subscribers,

The last email sent out was unfortunately a re-processing of a previous week's
set of abstracts - so if they seemed familiar, there was a good reason why
(thanks to Aidan Arnold for bringing this to my attention!) This is the
corrected week. I also have 4 weeks worth prepared to send out to you, and will
do so over the course of the next few days.

This week's selection was compiled by a your truly, and contains 47 new
abstracts and 11 replacements.

arXiv:1006.4579 (*cross-listing*)
Date: Wed, 23 Jun 2010 16:07:28 GMT (61kb)

Title: Dynamics of a quantum quench in an ultra-cold atomic BCS superfluid
Authors: Chih-Chun Chien and Bogdan Damski
Categories: cond-mat.quant-gas cond-mat.supr-con quant-ph
Comments: 4 pages, 3 figures
Report-no: LAUR 10-04106
   We study dynamics of an ultra-cold atomic BCS superfluid driven towards the
BCS superfluid-Fermi liquid quantum critical point by a gradual decrease of the
pairing interaction. We analyze how the BCS superfluid falls out of equilibrium
and show that the non-equilibrium gap and Cooper pair size reflect critical
properties of the transition. We observe three stages of evolution: adiabatic
where the Cooper pair size is inversely proportional to the equilibrium gap,
weakly non-equilibrium where it is inversely proportional to the
non-equilibrium gap, and strongly non-equilibrium where it decouples from both
equilibrium and non-equilibrium gap. These phenomena should stimulate future
experimental characterization of non-equilibrium ultra-cold atomic BCS
\\ ( http://arxiv.org/abs/1006.4579 , 61kb)
arXiv:1007.0281 (*cross-listing*)
Date: Fri, 2 Jul 2010 00:23:43 GMT (2163kb)

Title: Phase fluctuations in anisotropic Bose condensates: from cigars to rings
Authors: L. Mathey, A. Ramanathan, K. C. Wright, S. R. Muniz, W. D. Phillips
   and Charles W. Clark
Categories: cond-mat.quant-gas quant-ph
Comments: 9 pages, 5 figures
   We study the phase-fluctuating condensate regime of ultra-cold atoms trapped
in a ring-shaped trap geometry, which has been realized in recent experiments.
We first consider a simplified box geometry, in which we identify the
conditions to create a state that is dominated by thermal phase-fluctuations,
and then explore the experimental ring geometry. In both cases we demonstrate
that the requirement for strong phase fluctuations can be expressed in terms of
the total number of atoms and the geometric length scales of the trap only. For
the ring-shaped trap we discuss the zero temperature limit in which a
condensate is realized where the phase is fluctuating due to interactions and
quantum fluctuations. We also address possible ways of detecting the phase
fluctuating regime in ring condensates.
\\ ( http://arxiv.org/abs/1007.0281 , 2163kb)
Date: Fri, 2 Jul 2010 05:04:58 GMT (1493kb,D)

Title: Synthetic magnetic fields for ultracold neutral atoms
Authors: Yu-Ju Lin, Rob L. Compton, Karina J. Garcia, James V. Porto, Ian B.
Categories: cond-mat.quant-gas
Journal-ref: Nature 462, 628 (2009)
   Neutral atomic Bose condensates and degenerate Fermi gases have been used to
realize important many-body phenomena in their most simple and essential forms,
without many of the complexities usually associated with material systems.
However, the charge neutrality of these systems presents an apparent limitation
- a wide range of intriguing phenomena arise from the Lorentz force for charged
particles in a magnetic field, such as the fractional quantum Hall states in
two-dimensional electron systems. The limitation can be circumvented by
exploiting the equivalence of the Lorentz force and the Coriolis force to
create synthetic magnetic fields in rotating neutral systems. This was
demonstrated by the appearance of quantized vortices in pioneering experiments
on rotating quantum gases, a hallmark of superfluids or superconductors in a
magnetic field. However, because of technical issues limiting the maximum
rotation velocity, the metastable nature of the rotating state and the
difficulty of applying stable rotating optical lattices, rotational approaches
are not able to reach the large fields required for quantum Hall physics. Here,
we experimentally realize an optically synthesized magnetic field for ultracold
neutral atoms, made evident from the appearance of vortices in our
Bose-Einstein condensate. Our approach uses a spatially-dependent optical
coupling between internal states of the atoms, yielding a Berry's phase
sufficient to create large synthetic magnetic fields, and is not subject to the
limitations of rotating systems; with a suitable lattice configuration, it
should be possible to reach the quantum Hall regime, potentially enabling
studies of topological quantum computation.
\\ ( http://arxiv.org/abs/1007.0294 , 1493kb)
Date: Fri, 2 Jul 2010 10:40:25 GMT (461kb)

Title: Carnot Theorem for nonequilibrium reservoirs
Authors: Simone De Liberato and Masahito Ueda
Categories: quant-ph cond-mat.stat-mech
   The Carnot theorem poses a fundamental limit on the maximal efficiency
achievable from an engine that works between two reservoirs at thermal
equilibrium. In this paper we extend this result to the case of arbitrary
nonequilibrium reservoirs, by proving that a single nonequilibrium reservoir is
formally equivalent to multiple equilibrium ones. We then apply our theory to
the case of quantum coherent reservoirs, testing our results against previous
theoretical calculations and predicting the possibility to realize a quantum
coherent engine working at unit efficiency.
\\ ( http://arxiv.org/abs/1007.0335 , 461kb)
Date: Fri, 2 Jul 2010 16:46:18 GMT (2399kb)

Title: Deterministic entanglement of two neutral atoms via Rydberg blockade
Authors: X. L. Zhang, L. Isenhower, A. T. Gill, T. G. Walker, and M. Saffman
Categories: quant-ph physics.atom-ph
Comments: 4 figures
   We demonstrate the first deterministic entanglement of two individually
addressed neutral atoms using a Rydberg blockade mediated controlled-NOT gate.
Parity oscillation measurements reveal an entanglement fidelity of
$F=0.58\pm0.04$, which is above the entanglement threshold of $F=0.5$, without
any correction for atom loss, and $F=0.71\pm0.05$ after correcting for
background collisional losses. The fidelity results are shown to be in good
agreement with a detailed error model.
\\ ( http://arxiv.org/abs/1007.0397 , 2399kb)
Date: Fri, 2 Jul 2010 17:06:35 GMT (185kb)

Title: Effect of spatial inhomogeneity on the mapping between strongly
   interacting fermions and weakly interacting spins
Authors: Vivian V. Fran\c{c}a and Klaus Capelle
Categories: cond-mat.str-el
Comments: 7 pages, 6 figures
   A combined analytical and numerical study is performed of the mapping between
strongly interacting fermions and weakly interacting spins, in the framework of
the Hubbard, t-J and Heisenberg models. While for spatially homogeneous models
in the thermodynamic limit the mapping is thoroughly understood, we here focus
on aspects that become relevant in spatially inhomogeneous situations, such as
the effect of boundaries, impurities, superlattices and interfaces. We consider
parameter regimes that are relevant for traditional applications of these
models, such as electrons in cuprates and manganites, and for more recent
applications to atoms in optical lattices. The rate of the mapping as a
function of the interaction strength is determined from the Bethe-Ansatz for
infinite systems and from numerical diagonalization for finite systems. We show
analytically that if translational symmetry is broken through the presence of
impurities, the mapping persists and is, in a certain sense, as local as
possible, provided the spin-spin interaction between two sites of the
Heisenberg model is calculated from the harmonic mean of the onsite Coulomb
interaction on adjacent sites of the Hubbard model. Numerical calculations
corroborate these findings also in interfaces and superlattices, where
analytical calculations are more complicated.
\\ ( http://arxiv.org/abs/1007.0400 , 185kb)
Date: Fri, 2 Jul 2010 17:12:02 GMT (1344kb)

Title: A continuous-variable formalism for the Faraday atom-light interface
Authors: Julia Stasi\'nska, Simone Paganelli, Carles Rod\'o and Anna Sanpera
Categories: quant-ph
   Quantum interfaces between polarized atomic ensembles and coherent states of
light, applied recently to manipulate bipartite and multipartite entanglement,
are revisited by means of a continuous-variable formalism. The explicit use of
the continuous-variable formalism facilitates significantly the analysis of
entanglement between different modes, reducing it to the study of the
properties of a final covariance matrix which can be found analytically.
Furthermore, it allows to study matter-light interfaces for mixed states,
adapting the formalism to the experimental situations in which the initial
prepared Gaussian states are, unavoidably, affected by a certain amount of
noise. A multipartite scenario, leading to the generation of macroscopic
cluster states is presented and analyzed in detail within this formalism.
\\ ( http://arxiv.org/abs/1007.0403 , 1344kb)
arXiv:1007.0458 (*cross-listing*)
Date: Fri, 2 Jul 2010 23:17:59 GMT (743kb)

Title: External field control of collective spin excitations in an optical
   lattice of $^2\Sigma$ molecules
Authors: Jes\'us P\'erez-R\'ios, Felipe Herrera and Roman V. Krems
Categories: physics.chem-ph physics.atom-ph quant-ph
   We show that an ensemble of $^2\Sigma$ molecules in the rotationally ground
state trapped on an optical lattice exhibits collective spin excitations that
can be controlled by applying superimposed electric and magnetic fields. In
particular, we show that the lowest energy excitation of the molecular ensemble
at certain combinations of electric and magnetic fields leads to the formation
of a magnetic Frenkel exciton. The exciton bandwidth can be tuned by varying
the electric or magnetic fields. We show that the exciton states can be
localized by creating vacancies in the optical lattice. The localization
patterns of the magnetic exciton states are sensitive to the number and
distribution of vacancies, which can be exploited for engineering many-body
entangled spin states. We consider the dynamics of magnetic exciton wavepackets
and show that the spin excitation transfer between molecules in an optical
lattice can be accelerated or slowed down by tuning an external magnetic or
electric field.
\\ ( http://arxiv.org/abs/1007.0458 , 743kb)
arXiv:1007.0462 (*cross-listing*)
Date: Sat, 3 Jul 2010 00:18:48 GMT (14kb)

Title: Blackbody radiation shift in 87Rb frequency standard
Authors: M. S. Safronova, Dansha Jiang, and U. I. Safronova
Categories: physics.atom-ph quant-ph
Comments: 7 pages
   The operation of atomic clocks is generally carried out at room temperature,
whereas the definition of the second refers to the clock transition in an atom
at absolute zero. This implies that the clock transition frequency should be
corrected in practice for the effect of finite temperature of which the leading
contributor is the blackbody radiation (BBR) shift. Experimental measurements
of the BBR shifts are difficult. In this work, we have calculated the blackbody
radiation shift of the ground-state hyperfine microwave transition in 87Rb
using the relativistic all-order method and carried out detailed evaluation of
the accuracy of our final value. Particular care is taken to accurately account
for the contributions from highly-excited states. Our predicted value for the
Stark coefficient, k_S=-1.240(4)\times 10^{-10}\text{Hz/(V/m)}^{2} is three
times more accurate than the previous calculation [1].
\\ ( http://arxiv.org/abs/1007.0462 , 14kb)
Date: Sat, 3 Jul 2010 05:52:04 GMT (376kb,D)

Title: Collisional properties of cold spin-polarized nitrogen gas: theory,
   experiment, and prospects as a sympathetic coolant for trapped atoms and
Authors: T. V. Tscherbul, J. Klos, A. Dalgarno, B. Zygelman, Z. Pavlovic, M. T.
   Hummon, H-I Lu, E. Tsikata, J. M. Doyle
Categories: physics.atom-ph
Comments: 46 pages, 17 figures, 3 tables
   We report a combined experimental and theoretical study of collision-induced
dipolar relaxation in a cold spin-polarized gas of atomic nitrogen (N). We use
buffer gas cooling to create trapped samples of 14N and 15N atoms with
densities 5+/-2 x 10^{12} cm-3 and measure their magnetic relaxation rates at
milli-Kelvin temperatures. Rigorous quantum scattering calculations based on
accurate ab initio interaction potentials for the 7Sigma_u electronic state of
N2 demonstrate that dipolar relaxation in N + N collisions occurs at a slow
rate of ~10^{-13} cm3/s over a wide range of temperatures (1 mK to 1 K) and
magnetic fields (10 mT to 2 T). The calculated dipolar relaxation rates are
insensitive to small variations of the interaction potential and to the
magnitude of the spin-exchange interaction, enabling the accurate calibration
of the measured N atom density. We find consistency between the calculated and
experimentally determined rates. Our results suggest that N atoms are promising
candidates for future experiments on sympathetic cooling of molecules.
\\ ( http://arxiv.org/abs/1007.0469 , 376kb)
arXiv:1007.0480 (*cross-listing*)
Date: Sat, 3 Jul 2010 08:32:41 GMT (777kb)

Title: Diffusive Decay of the Vortex Tangle and Kolmogorov turbulence in
   quantum fluids
Authors: Sergey K. Nemirovskii, L.P. Kondaurova
Categories: cond-mat.other physics.flu-dyn quant-ph
Comments: The work was presented at SUR 2010, submitted in JLTP
   The idea that chaotic set of quantum vortices can mimic classical turbulence,
or at least reproduce many main features, is currently actively being
developed. Appreciating significance of the challenging problem of the
classical turbulence it can be expressed that the idea to study it in terms of
quantized line is indeed very important and may be regarded as a breakthrough.
For this reason, this theory should be carefully scrutinized. One of the basic
arguments supporting this point of view is the fact that vortex tangle decays
at zero temperature, when the apparent mechanism of dissipation (mutual
friction) is absent. Since the all possible mechanisms of dissipation of the
vortex energy, discussed in the literature, are related to the small scales, it
is natural to suggest that the Kolmogorov cascade takes the place with the flow
of the energy, just as in the classical turbulence. In a series of recent
experiment attenuation of vortex line density was observed and authors
attribute this decay to the properties of the Kolmogorov turbulence. In the
present work we discuss alternative possibility of decay of the vortex tangle,
which is not related to dissipation at small scales. This mechanism is just the
diffusive like spreading of the vortex tangle. We discuss a number of the key
experiments, considering them both from the point of view of alternative
explanation and of the theory of Kolmogorov turbulence in quantum fluids.
\\ ( http://arxiv.org/abs/1007.0480 , 777kb)
Date: Sat, 3 Jul 2010 17:57:28 GMT (153kb)

Title: Matter-wave localization in a random potential
Authors: Yongshan Cheng and S. K. Adhikari
Categories: cond-mat.quant-gas
   By numerical and variational solution of the Gross-Pitaevskii equation, we
studied the localization of a noninteracting and weakly-interacting
Bose-Einstein condensate (BEC) in a disordered cold atom lattice and a speckle
potential. In the case of a single BEC fragment, the variational analysis
produced good results. For a weakly disordered potential, the localized BECs
are found to have an exponential tail as in weak Anderson localization. We also
investigated the expansion of a noninteracting BEC in these potential. We find
that the BEC will be locked in an appropriate localized state after an initial
expansion and will execute breathing oscillation around a mean shape when a BEC
at equilibrium in a harmonic trap is suddenly released into a disorder
\\ ( http://arxiv.org/abs/1007.0506 , 153kb)
Date: Sun, 4 Jul 2010 16:05:31 GMT (560kb,D)

Title: Optomechanically induced transparency
Authors: S. Weis, R. Riviere, S. Deleglise, E. Gavartin, O. Arcizet, A.
   Schliesser, T. J. Kippenberg
Categories: quant-ph
   Coherent interaction of laser radiation with multilevel atoms and molecules
can lead to quantum interference in the electronic excitation pathways. A
prominent example observed in atomic three-level-systems is the phenomenon of
electromagnetically induced transparency (EIT), in which a control laser
induces a narrow spectral transparency window for a weak probe laser beam. The
concomitant rapid variation of the refractive index in this spectral window can
give rise to dramatic reduction of the group velocity of a propagating pulse of
probe light. Dynamic control of EIT via the control laser enables even a
complete stop, that is, storage, of probe light pulses in the atomic medium.
Here, we demonstrate optomechanically induced transparency (OMIT)--formally
equivalent to EIT--in a cavity optomechanical system operating in the resolved
sideband regime. A control laser tuned to the lower motional sideband of the
cavity resonance induces a dipole-like interaction of optical and mechanical
degrees of freedom. Under these conditions, the destructive interference of
excitation pathways for an intracavity probe field gives rise to a window of
transparency when a two-photon resonance condition is met. As a salient feature
of EIT, the power of the control laser determines the width and depth of the
probe transparency window. OMIT could therefore provide a new approach for
delaying, slowing and storing light pulses in long-lived mechanical excitations
of optomechanical systems, whose optical and mechanical properties can be
tailored in almost arbitrary ways in the micro- and nano-optomechanical
platforms developed to date.
\\ ( http://arxiv.org/abs/1007.0565 , 560kb)
Date: Sun, 4 Jul 2010 17:57:23 GMT (470kb,D)

Title: Quantum Enhancement of the Zero-Area Sagnac Interferometer Topology for
   Gravitational Wave Detection
Authors: Tobias Eberle, Sebastian Steinlechner, J\"oran Bauchrowitz, Vitus
   H\"andchen, Henning Vahlbruch, Moritz Mehmet, Helge M\"uller-Ebhardt, Roman
Categories: quant-ph
Comments: 4 pages, 4 figures
Journal-ref: Phys. Rev. Lett. 104, 251102 (2010)
DOI: 10.1103/PhysRevLett.104.251102
   Only a few years ago, it was realized that the zero-area Sagnac
interferometer topology is able to perform quantum nondemolition measurements
of position changes of a mechanical oscillator. Here, we experimentally show
that such an interferometer can also be efficiently enhanced by squeezed light.
We achieved a nonclassical sensitivity improvement of up to 8.2 dB, limited by
optical loss inside our interferometer. Measurements performed directly on our
squeezed-light laser output revealed squeezing of 12.7 dB. We show that the
sensitivity of a squeezed-light enhanced Sagnac interferometer can surpass the
standard quantum limit for a broad spectrum of signal frequencies without the
need for filter cavities as required for Michelson interferometers. The Sagnac
topology is therefore a powerful option for future gravitational-wave
detectors, such as the Einstein Telescope, whose design is currently being
\\ ( http://arxiv.org/abs/1007.0574 , 470kb)
Date: Mon, 5 Jul 2010 09:37:50 GMT (544kb)

Title: Fluctuation induced drift in a gravitationally tilted optical lattice
Authors: M. Zelan, H. Hagman, K. Karlsson, C. M. Dion, A. Kastberg
Categories: physics.atom-ph cond-mat.stat-mech
   Experimental and theoretical studies are made of Brownian particles trapped
in a periodic potential, which is very slightly tilted due to gravity. In the
presence of fluctuations, these will trigger a measurable average drift along
the direction of the tilt. The magnitude of the drift varies with the ratio
between the bias force and the trapping potential. This can be closely compared
to a theoretical model system, based on a Fokker-Planck-equation formalism. We
show that the level of control and measurement precision we have in our system,
which is based on cold atoms trapped in a 3D dissipative optical lattice, makes
the experimental setup suitable as a testbed for fundamental statistical
physics. We simulate the system with a very simplified and general classical
model, as well as with an elaborate semi-classical Monte-Carlo simulation. In
both cases, we achieve good qualitative agreement with experimental data.
\\ ( http://arxiv.org/abs/1007.0645 , 544kb)
Date: Mon, 5 Jul 2010 09:48:15 GMT (555kb,D)

Title: Bose-Einstein Condensates in Non-abelian Gauge Fields
Authors: Tin-Lun Ho and Shizhong Zhang
Categories: cond-mat.quant-gas
   The recent success of the NIST group in generating abelian gauge field in
cold atoms has created opportunities to simulate electronic transports in
solids using atomic gases. Very recently, the NIST group has also announced in
a DARPA Meeting the creation of non-abelian gauge fields in a pseudo spin-1/2
Bose gas. While there have been considerable theoretical activities in
synthetic gauge fields, non-abelian fields have not been generated until now.
Here, we show that in a non-abelian gauge field, a spinor condensate will
develop a spontaneous stripe structure in each spin component, reflecting a
ground state made up of two non-orthogonal dressed states with different
momenta. Depending on interactions, this ground state can reduce back to a
single dressed state. These momentum carrying stripes are the {\em macroscopic}
bosonic counterpart of the spin-orbit phenomena in fermions that are being
actively studied in electron physics today.
\\ ( http://arxiv.org/abs/1007.0650 , 555kb)
Date: Mon, 5 Jul 2010 13:44:12 GMT (4597kb)

Title: A portable laser system for high precision atom interferometry
Authors: Malte Schmidt, Marco Prevedelli, Antonio Giorgini, Guglielmo M. Tino,
   Achim Peters
Categories: physics.atom-ph
Comments: 7 pages, 11 figures; to be published
   We present a modular rack-mounted laser system for the cooling and
manipulation of neutral rubidium atoms which has been developed for the
portable gravimeter GAIN, an atom interferometer that will be capable of
performing high precision gravity measurements directly at sites of geophysical
interest. This laser system is designed to be compact, mobile and robust, yet
it still offers improvements over many conventional laboratory-based laser
systems. Our system is contained in a standard 19" rack and emits light at five
different wavelengths simultaneously on up to 12 fibre ports at a total output
power of 800 mW. These wavelengths can be changed and switched between ports in
less than a microsecond. The setup includes two phase-locked Raman lasers with
a phase noise spectral density of less than 1 \mu rad/sqrt(Hz) in the frequency
range in which our gravimeter is most sensitive to noise. We characterize this
laser system and evaluate the performance limits it imposes on an
\\ ( http://arxiv.org/abs/1007.0679 , 4597kb)
Date: Mon, 5 Jul 2010 14:11:55 GMT (41kb)

Title: Reference data for phase diagrams of triangular and hexagonal bosonic
Authors: Niklas Teichmann, Dennis Hinrichs, Martin Holthaus
Categories: cond-mat.quant-gas
Comments: 6 pages, 5 figures, accepted for publication in EPL
   We investigate systems of bosonic particles at zero temperature in triangular
and hexagonal optical lattice potentials in the framework of the Bose-Hubbard
model. Employing the process-chain approach, we obtain accurate values for the
boundaries between the Mott insulating phase and the superfluid phase. These
results can serve as reference data for both other approximation schemes and
upcoming experiments. Since arbitrary integer filling factors g are amenable to
our technique, we are able to monitor the behavior of the critical hopping
parameters with increasing filling. We also demonstrate that the g-dependence
of these exact parameters is described almost perfectly by a scaling relation
inferred from the mean-field approximation.
\\ ( http://arxiv.org/abs/1007.0685 , 41kb)
Date: Mon, 5 Jul 2010 14:58:36 GMT (1000kb)

Title: Quantum jumps induced by matter-wave fluctuations
Authors: J. M. Torres, M. Bienert, S. Zippilli, and G. Morigi
Categories: quant-ph
   We theoretically study the occurrence of quantum jumps in the resonance
fluorescence of a trapped atom. Here, the atom is laser cooled in a
configuration of level such that the occurrence of a quantum jump is associated
to a change of the vibrational center-of-mass motion by one phonon. The
statistics of the occurrence of the dark fluorescence period is studied as a
function of the physical parameters and the corresponding features in the
spectrum of resonance fluorescence are identified. We discuss the information
which can be extracted on the atomic motion from the observation of a quantum
jump in the considered setup.
\\ ( http://arxiv.org/abs/1007.0694 , 1000kb)
arXiv:1007.0703 (*cross-listing*)
Date: Mon, 5 Jul 2010 15:26:47 GMT (18kb)

Title: Phase Estimation With Interfering Bose-Condensed Atomic Clouds
Authors: Jan Chwedenczuk, Francesco Piazza and Augusto Smerzi
Categories: cond-mat.quant-gas quant-ph
Comments: 4 pages, 2 figures
   We investigate how to estimate from atom-position measurements the relative
phase of two Bose-Einstein condensates released from a double-well potential.
We demonstrate that the phase estimation sensitivity via the fit of the average
density to the interference pattern is fundamentally bounded by shot noise.
This bound can be overcome by estimating the phase from the measurement of
$\sqrt N$ (or higher) correlation function. The optimal estimation strategy
requires the measurement of the $N$-th order correlation function. We also
demonstrate that a second estimation method -- based on the detection of the
center of mass of the interference pattern -- provides sub shot-noise
sensitivity. Yet, the implementation of both protocols might be experimentally
\\ ( http://arxiv.org/abs/1007.0703 , 18kb)
arXiv:1007.0782 (*cross-listing*)
Date: Mon, 5 Jul 2010 23:11:03 GMT (1048kb,D)

Title: Spin-charge-density wave in a squircle-like Fermi surface for ultracold
Authors: D. Makogon and I. B. Spielman and C. Morais Smith
Categories: cond-mat.quant-gas cond-mat.str-el physics.atom-ph
Comments: 4.2 pages, 2 figures
   We derive and discuss an experimentally realistic model describing ultracold
atoms in an optical lattice including a commensurate, but staggered, Zeeman
field. The resulting band structure is quite exotic; fermions in the third band
have an unusual rounded picture-frame Fermi surface (essentially two concentric
squircles), leading to imperfect nesting. We develop a generalized
SO(3,1)xSO(3,1) theory describing the spin and charge degrees of freedom
simultaneously, and show that the system can develop a coupled
spin-charge-density wave order. This ordering is absent in studies of the
Hubbard model that treat spin and charge density separately.
\\ ( http://arxiv.org/abs/1007.0782 , 1048kb)
Date: Tue, 6 Jul 2010 01:36:57 GMT (608kb)

Title: Exact few-body results for strongly correlated quantum gases in two
Authors: Xia-Ji Liu, Hui Hu and Peter D. Drummond
Categories: cond-mat.quant-gas
Comments: 11 pages, 6 figures
   The study of strongly correlated quantum gases in two dimensions has
important ramifications for understanding many intriguing pheomena in solid
materials, such as high-$T_{c}$ superconductivity and the fractional quantum
Hall effect. However, theoretical methods are plagued by the existence of
significant quantum fluctuations. Here, we present two- and three-body exact
solutions for both fermions and bosons trapped in a two-dimensional harmonic
potential, with an arbitrary $s$-wave scattering length. These few-particle
solutions link in a natural way to the high-temperature properties of
many-particle systems via a quantum virial expansion. As a concrete example,
using the energy spectrum of few fermions, we calculate the second and third
virial coefficients of a strongly interacting Fermi gas in two dimensions, and
consequently investigate its high-temperature thermodynamics. Our thermodynamic
results may be useful for ongoing experiments on two-dimensional Fermi gases.
These exact results also provide an unbiased benchmark for quantum Monte Carlo
simulations of two-dimensional Fermi gases at high temperatures.
\\ ( http://arxiv.org/abs/1007.0792 , 608kb)
arXiv:1007.0794 (*cross-listing*)
Date: Tue, 6 Jul 2010 02:05:50 GMT (1479kb)

Title: Atomic spatial coherence with spontaneous emission in a strong coupling
Authors: Zhen Fang, Rui Guo, Xiaoji Zhou, Xuzong Chen
Categories: physics.atom-ph cond-mat.quant-gas quant-ph
Comments: 4 pages, 5 figures, accepted by PRA
   The role of spontaneous emission in the interaction between a two-level atom
and a pumped micro-cavity in the strong coupling regime is discussed in this
paper. Especially, using a quantum Monte-Carlo simulation, we investigate
atomic spatial coherence. It is found that atomic spontaneous emission destroys
the coherence between neighboring lattice sites, while the cavity decay does
not. Furthermore, our computation of the spatial coherence function shows that
the in-site locality is little affected by the cavity decay, but greatly
depends on the cavity pump amplitude.
\\ ( http://arxiv.org/abs/1007.0794 , 1479kb)
arXiv:1007.0840 (*cross-listing*)
Date: Tue, 6 Jul 2010 09:20:01 GMT (917kb)

Title: Entanglement Spectrum Identifying Transition from Vortex Liquid to
   Vortex Lattice
Authors: Zhao Liu, Hong-Li Guo, Vlatko Vedral and Heng Fan
Categories: cond-mat.quant-gas quant-ph
Comments: 4 pages, 4 figures, comments are welcome
   We use entanglement to investigate the transition from vortex liquid phase to
vortex lattice phase in weakly interacting rotating Bose-Einstein condensate on
the torus geometry. Ground state entanglement spectrum is analyzed to
distinguish these two different phases. The low-lying part of ground state
entanglement spectrum, as well as the behavior of its lowest level change
clearly when the transition occurs. We also show that the decrease of
entanglement between particles can be regarded as a signal of the transition.
\\ ( http://arxiv.org/abs/1007.0840 , 917kb)
Date: Tue, 6 Jul 2010 13:16:45 GMT (89kb)

Title: Coherently enhanced Raman scattering in atomic vapor
Authors: Chun-Hua Yuan, L. Q. Chen, Jietai Jing, Z. Y. Ou, Weiping Zhang
Categories: quant-ph
Comments: 7 pages, 4 figures, submitted to Phys. Rev. A
   We present a scheme to obtain the coherently enhanced Raman scattering in
atomic vapor which is induced by a spin wave initially written by a weak write
laser. The enhancement of Raman scattering is dependent on the number and the
spatial distribution of the flipped atoms generated by the weak write laser.
Such an enhanced Raman scattering may have practical applications in quantum
information, nonlinear optics and laser spectroscopy because of its simplicity.
\\ ( http://arxiv.org/abs/1007.0884 , 89kb)
Date: Tue, 6 Jul 2010 13:23:15 GMT (1386kb,D)

Title: Asymptotic Bound-state Model for Feshbach Resonances
Authors: T.G. Tiecke and M.R. Goosen and J.T.M. Walraven and S.J.J.M.F.
Categories: cond-mat.quant-gas
Comments: 13 pages, 8 figures
   We present an Asymptotic Bound-state Model which can be used to accurately
describe all Feshbach resonance positions and widths in a two-body system. With
this model we determine the coupled bound states of a particular two-body
system. The model is based on analytic properties of the two-body Hamiltonian,
and on asymptotic properties of uncoupled bound states in the interaction
potentials. In its most simple version, the only necessary parameters are the
least bound state energies and actual potentials are not used. The complexity
of the model can be stepwise increased by introducing threshold effects,
multiple vibrational levels and additional potential parameters. The model is
extensively tested on the 6Li-40K system and additional calculations on the
40K-87Rb system are presented.
\\ ( http://arxiv.org/abs/1007.0886 , 1386kb)
arXiv:1007.0913 (*cross-listing*)
Date: Tue, 6 Jul 2010 15:05:52 GMT (261kb)

Title: Quantum phase transitions in an interacting atom-molecule boson model
Authors: Gilberto Santos, Angela Foerster, Jon Links, Eduardo Mattei, Silvio R.
Categories: cond-mat.quant-gas quant-ph
Comments: 6 pages, 10 figures
Journal-ref: Physical Review A, 81, 063621 (2010)
DOI: 10.1103/PhysRevA.81.063621
   We study the quantum phase transitions of a model that describes the
interconversion of interacting bosonic atoms and molecules. Using a classical
analysis, we identify a threshold coupling line separating a molecular phase
and a mixed phase. Through studies of the energy gap, von Neumann entanglement
entropy, and fidelity, we give evidence that this line is associated to a
boundary line in the ground-state phase diagram of the quantum system.
\\ ( http://arxiv.org/abs/1007.0913 , 261kb)
arXiv:1007.0922 (*cross-listing*)
Date: Tue, 6 Jul 2010 15:21:08 GMT (1760kb,D)

Title: Atom-light crystallization of BECs in multimode cavities: Nonequilibrium
   classical and quantum phase transitions, emergent lattices, supersolidity,
   and frustration
Authors: Sarang Gopalakrishnan, Benjamin L. Lev, Paul M. Goldbart
Categories: cond-mat.quant-gas quant-ph
Comments: 34 pages, 13 figures; follow up to Nat. Phys. 5, 845 (2009)
   The self-organization of a Bose-Einstein condensate in a transversely pumped
optical cavity is a process akin to crystallization: when pumped by a laser of
sufficient intensity, the coupled matter and light fields evolve,
spontaneously, into a spatially modulated pattern, or crystal, whose lattice
structure is dictated by the geometry of the cavity. In cavities having
multiple degenerate modes, the quasi-continuum of possible lattice
arrangements, and the continuous symmetry breaking associated with the adoption
of a particular lattice arrangement, give rise to phenomena such as phonons,
defects, and frustration, which have hitherto been unexplored in ultracold
atomic settings. The present work develops a nonequilibrium field-theoretic
approach to explore the self-organization of a BEC in a pumped, lossy optical
cavity. We find that the transition is well described, in the regime of primary
interest, by an effective equilibrium theory. At nonzero temperatures, the
self-organization occurs via a fluctuation-driven first-order phase transition
of the Brazovskii class; this transition persists to zero temperature, and
crosses over into a quantum phase transition of a new universality class. We
make further use of our field-theoretic description to investigate the role of
nonequilibrium fluctuations on the self-organization transition, as well as to
explore the nucleation of ordered-phase droplets, the nature and energetics of
topological defects, supersolidity in the ordered phase, and the possibility of
frustration controlled by the cavity geometry. In addition, we discuss the
range of experimental parameters for which we expect the phenomena described
here to be observable, along with possible schemes for detecting ordering and
fluctuations via either atomic correlations or the correlations of the light
emitted from the cavity.
\\ ( http://arxiv.org/abs/1007.0922 , 1760kb)
Date: Tue, 6 Jul 2010 16:38:10 GMT (502kb)

Title: Story of a journey: Rutherford to the Large Hadron Collider and onwards
Authors: Rohini M. Godbole
Categories: physics.pop-ph hep-ph
Comments: 30 pages, 6 figures, LaTeX
   In this article, I set out arguments why the Large Hadron Collider (LHC) :
the machine and the experiments with it, are a watershed for particle physics.
I give a historical perspective of the essential link between development of
particle accelerators and that in our knowledge of the laws governing
interactions among the fundamental particles, showing how this journey has
reached destination LHC. I explain how the decisions for the LHC design; the
energy and number of particles in the beam, were arrived at. I will end by
discussing the LHC physics agenda and the time line in which the particle
physicists hope to achieve it.
\\ ( http://arxiv.org/abs/1007.0946 , 502kb)
Date: Tue, 6 Jul 2010 19:48:43 GMT (736kb,D)

Title: Mapping the spatial distribution of entanglement in optical lattices
Authors: Emilio Alba, Geza Toth and Juan Jose Garcia-Ripoll
Categories: quant-ph
Comments: 2 figures, 4 pages
   We study the entangled states that can be generated using two species of
atoms trapped in independently movable, two-dimensional optical lattices. We
show that using two sets of measurements it is possible to measure a set of
entanglement witness operators distributed over arbitrarily large regions of
the lattice, and use these witnesses to produce two-dimensional plots of the
entanglement content of these states. We also discuss the influence of noise on
the states and on the witnesses, as well as connections to ongoing experiments.
\\ ( http://arxiv.org/abs/1007.0985 , 736kb)
Date: Wed, 7 Jul 2010 01:04:36 GMT (490kb,D)

Title: Quantum Phase Transitions in quasi-one dimensional systems
Authors: Thierry Giamarchi
Categories: cond-mat.str-el
Comments: Chapter of the book: Understanding Quantum Phase Transitions, ed.
   Lincoln D. Carr (CRC Press / Taylor&Francis, 2010, to appear)
   I review in this chapter several classes of quantum phase transitions that
occur in quasi-one dimensional systems. I start by examining the simple case of
coupled spin chains and ladders, then move to the case of bosons, and finally
deal with the more complicated and still largely open case of fermions.
\\ ( http://arxiv.org/abs/1007.1029 , 490kb)
Date: Wed, 7 Jul 2010 01:05:46 GMT (849kb,D)

Title: Interactions in Quantum Fluids
Authors: Thierry Giamarchi
Categories: cond-mat.str-el cond-mat.quant-gas
Comments: Lectures notes of a course given at the "Les Houches Summer School of
   Physics in Singapore" session on "Ultracold Gases and Quantum Information"
   (29 June - 24 July, 2009); to be published by Oxford University Press
   In these notes I review the basic concepts of the effects of interactions on
quantum particles. I focuss here mostly on the case of fermions, but several
aspects of interacting bosons are mentioned as well. These notes have been
voluntarily kept at an elementary level and should be suitable for students
wanting to enter this field. I review the concept of Fermi liquid, and then
move to a description of the interaction effects, as well as the main models
that are used to tackle these questions. Finally I study the case of one
dimensional interacting particles that constitutes a fascinating special case.
\\ ( http://arxiv.org/abs/1007.1030 , 849kb)
Date: Wed, 7 Jul 2010 03:32:42 GMT (996kb)

Title: Three attractively interacting fermions in a harmonic trap: Exact
   solution, ferromagnetism, and high-temperature thermodynamics
Authors: Xia-Ji Liu, Hui Hu and Peter D. Drummond
Categories: cond-mat.quant-gas
Comments: 14 pages, 7 figures
   Three fermions with strongly repulsive interactions in a spherical harmonic
trap, constitute the simplest nontrivial system that can exhibit the onset of
itinerant ferromagnetism. Here, we present exact solutions for three trapped,
attractively interacting fermions near a Feshbach resonance. We analyze energy
levels on the upper branch of the resonance where the atomic interaction is
effectively repulsive. When the s-wave scattering length a is sufficiently
positive, three fully polarized fermions are energetically stable against a
single spin-flip, indicating the possibility of itinerant ferromagnetism, as
inferred in the recent experiment. We also investigate the high-temperature
thermodynamics of a strongly repulsive or attractive Fermi gas using a quantum
virial expansion. The second and third virial coefficients are calculated. The
resulting equations of state can be tested in future quantitative experimental
measurements at high temperatures and can provide a useful benchmark for
quantum Monte Carlo simulations.
\\ ( http://arxiv.org/abs/1007.1041 , 996kb)
Date: Wed, 7 Jul 2010 09:35:49 GMT (121kb)

Title: Spin drag Hall effect in a rotating Bose mixture
Authors: H.J. van Driel, R.A. Duine, H.T.C. Stoof
Categories: cond-mat.quant-gas
Comments: 1 figure
   We show that in a rotating two-component Bose mixture, the spin drag between
the two different spin species shows a Hall effect. This spin drag Hall effect
can be observed experimentally by studying the out-of-phase dipole mode of the
mixture. We determine the damping of this mode due to spin drag as a function
of temperature. We find that due to Bose stimulation there is a strong
enhancement of the damping for temperatures close to the critical temperature
for Bose-Einstein condensation.
\\ ( http://arxiv.org/abs/1007.1088 , 121kb)
Date: Wed, 7 Jul 2010 13:15:33 GMT (156kb)

Title: Metric Signature Transitions in Optical Metamaterials
Authors: Igor I. Smolyaninov, Evgenii E. Narimanov
Categories: physics.optics cond-mat.quant-gas gr-qc
Comments: 16 pages, 3 figures, accepted for publication in Physical Review
   We demonstrate that the extraordinary waves in indefinite metamaterials
experience (- - + +) effective metric signature. During a metric signature
change transition in such a metamaterial, a Minkowski space-time is "created"
together with large number of particles populating this space-time. Such
metamaterial models provide a table top realization of metric signature change
events suggested to occur in Bose-Einstein condensates and quantum gravity
\\ ( http://arxiv.org/abs/1007.1130 , 156kb)
arXiv:1007.1154 (*cross-listing*)
Date: Wed, 7 Jul 2010 14:48:37 GMT (70kb)

Title: Nonclassical lattice solitons in optical lattice via Electromagnetically
   induced transparency
Authors: Yongyao Li, Zhonghui Yuan, Wei Pang and Yikun Liu
Categories: physics.optics quant-ph
   An optical four-level atomic discrete system through optical induction is
proposed. A theoretical scheme to produce nonclassical lattice solitons (NLS)
in the system is presented with the use of the effects of enhanced self-phase
modulation and the giant kerr effect in the electromagnetically induced
transparency. The power density and the photon flux can be tuned to a very low
level by the controlling field and the soliton can propagate with very slow
group velocity. By changing the sign of the detuning $\Delta_{1}$, both
in-phase and $\pi$ out-of-phase NLSs can be produced in this system.
\\ ( http://arxiv.org/abs/1007.1154 , 70kb)
Date: Wed, 7 Jul 2010 15:59:53 GMT (173kb)

Title: Microcavity quantum-dot systems for non-equilibrium Bose-Einstein
Authors: I. M. Piper, P. R. Eastham, M. Ediger, A. M. Wilson, Y. Wu, M. Hugues,
   M. Hopkinson and R. T. Phillips
Categories: cond-mat.mes-hall
Comments: 4 pages, 4 figures, to be published in J. Phys. Conf. Ser. for QD2010
   We review the practical conditions required to achieve a non-equilibrium BEC
driven by quantum dynamics in a system comprising a microcavity field mode and
a distribution of localised two-level systems driven to a step-like population
inversion profile. A candidate system based on eight 3.8nm layers of
In(0.23)Ga(0.77)As in GaAs shows promising characteristics with regard to the
total dipole strength which can be coupled to the field mode.
\\ ( http://arxiv.org/abs/1007.1171 , 173kb)
Date: Wed, 7 Jul 2010 15:59:53 GMT (41kb)

Title: Entanglement from density measurements: analytical density-functional
   for the entanglement of strongly correlated fermions
Authors: Vivian V. Fran\c{c}a and Irene D'Amico
Categories: quant-ph cond-mat.quant-gas cond-mat.str-el
Comments: 4 pages, 2 figures
   We derive an analytical density functional for the single-site entanglement
of the one-dimensional homogeneous Hubbard model, by means of an approximation
to the linear entropy. We show that this very simple density functional
reproduces quantitatively the exact results. We then use this functional as
input for a local-density approximation to the single-site entanglement of
inhomogeneous systems. We illustrate the power of this approach in a
harmonically confined system, which could simulate recent experiments with
ultracold atoms in optical lattices. The impressive quantitative agreement with
numerical calculations -- which includes reproducing subtle signatures of the
particle density stages -- shows that our density-functional can provide
entanglement calculations for actual experiments via density measurements.
\\ ( http://arxiv.org/abs/1007.1172 , 41kb)
Date: Wed, 7 Jul 2010 16:04:22 GMT (350kb)

Title: Dynamics of Energy Transport in a Toda Ring
Authors: B. Sriram Shastry and A. P. Young
Categories: cond-mat.stat-mech
Comments: 34 pages, 11 figures
   We present results on the relationships between persistent currents and the
known conservation laws in the classical Toda ring. We also show that
perturbing the integrability leads to a decay of the currents at long times,
with a time scale that is determined by the perturbing parameter. We summarize
several known results concerning the Toda ring in 1-dimension, and present new
results relating to the frequency, average kinetic and potential energy, and
mean square displacement in the cnoidal waves, as functions of the wave vector
and a parameter that determines the non linearity.
\\ ( http://arxiv.org/abs/1007.1173 , 350kb)
Date: Thu, 8 Jul 2010 10:02:42 GMT (134kb)

Title: Time-resolved measurement of Landau--Zener tunneling in different bases
Authors: G. Tayebirad, A. Zenesini, D. Ciampini, R. Mannella, O. Morsch, E.
   Arimondo, N. L\"orch, and S. Wimberger
Categories: cond-mat.quant-gas
   A comprehensive study of the tunneling dynamics of a Bose--Einstein
condensate in a tilted periodic potential is presented. We report numerical and
experimental results on time-resolved measurements of the Landau--Zener
tunneling of ultracold atoms introduced by the tilt, which experimentally is
realized by accelerating the lattice. The use of different protocols enables us
to access the tunneling probability, numerically as well as experimentally, in
two different bases, namely, the adiabatic basis and the diabatic basis. The
adiabatic basis corresponds to the eigenstates of the lattice, and the diabatic
one to the free-particle momentum eigenstates. Our numerical and experimental
results are compared with existing two-state Landau--Zener models.
\\ ( http://arxiv.org/abs/1007.1326 , 134kb)
Date: Thu, 8 Jul 2010 10:48:41 GMT (326kb)

Title: A Green's function decoupling scheme for the Edwards fermion-boson model
Authors: D M Edwards, S Ejima, A Alvermann, and H Fehske
Categories: cond-mat.str-el
Comments: 19 pages, 7 figures
   Holes in a Mott insulator are represented by spinless fermions in the
fermion-boson model introduced by Edwards. Although the physically interesting
regime is for low to moderate fermion density the model has interesting
properties over the whole density range. It has previously been studied at
half-filling in the one-dimensional (1D) case by numerical methods, in
particular exact diagonalization and density matrix renormalization group
(DMRG). In the present study the one-particle Green's function is calculated
analytically by means of a decoupling scheme for the equations of motion, valid
for arbitrary density in 1D, 2D and 3D with fairly large boson energy and zero
boson relaxation parameter. The Green's function is used to compute some ground
state properties, and the one-fermion spectral function, for fermion densities
n=0.1, 0.5 and 0.9 in the 1D case. The results are generally in good agreement
with numerical results obtained by DMRG and dynamical DMRG and new light is
shed on the nature of the ground state at different fillings. The Green's
function approximation is sufficiently successful in 1D to justify future
application to the 2D and 3D cases.
\\ ( http://arxiv.org/abs/1007.1342 , 326kb)
Date: Thu, 8 Jul 2010 13:47:49 GMT (166kb)

Title: Coherence as ultrashort pulse train generator
Authors: Gevorg Muradyan and Mariam Hovhannisyan
Categories: quant-ph physics.optics
   Intense, well-controlled regular light pulse trains start to play a crucial
role in many fields of physics. We theoretically demonstrate a very simple and
robust technique for generating such periodic ultrashort pulses from a
continuous probe wave which propagates in a dispersive thermal gas media.
\\ ( http://arxiv.org/abs/1007.1377 , 166kb)
Date: Thu, 8 Jul 2010 15:23:18 GMT (29kb)

Title: Effect of Quasiparticles Injection on the AC Response of a
Authors: G. Catelani, L. I. Glazman, K. E. Nagaev
Categories: cond-mat.supr-con
Comments: 9 pages, 1 figure
   We calculate the AC linear response of a superconductor in a nonequilibrium
electronic state. The nonequilibrium state is produced by injecting
quasiparticles into the superconductor from normal leads through asymmetric
tunnel contacts. The dissipative part of the response is drastically increased
by the injected quasiparticles and is proportional to their total number
regardless of the imbalance between the numbers of electron-like and hole-like
\\ ( http://arxiv.org/abs/1007.1402 , 29kb)
arXiv:1007.1404 (*cross-listing*)
Date: Thu, 8 Jul 2010 15:29:22 GMT (1120kb)

Title: Multifractal wave functions of simple quantum maps
Authors: John Martin, Ignacio Garcia-Mata, Olivier Giraud and Bertrand Georgeot
Categories: nlin.CD cond-mat.mes-hall
Comments: 15 pages, 21 figures
   We study numerically multifractal properties of two models of one-dimensional
quantum maps, a map with pseudointegrable dynamics and intermediate spectral
statistics, and a map with an Anderson-like transition recently implemented
with cold atoms. Using extensive numerical simulations, we compute the
multifractal exponents of quantum wave functions and study their properties,
with the help of two different numerical methods used for classical
multifractal systems (box-counting method and wavelet method). We compare the
results of the two methods over a wide range of values. We show that the wave
functions of the Anderson map display a multifractal behavior similar to
eigenfunctions of the three-dimensional Anderson transition but of a weaker
type. Wave functions of the intermediate map share some common properties with
eigenfunctions at the Anderson transition (two sets of multifractal exponents,
with similar asymptotic behavior), but other properties are markedly different
(large linear regime for multifractal exponents even for strong
multifractality, different distributions of moments of wave functions, absence
of symmetry of the exponents). Our results thus indicate that the intermediate
map presents original properties, different from certain characteristics of the
Anderson transition derived from the nonlinear sigma model. We also discuss the
importance of finite-size effects.
\\ ( http://arxiv.org/abs/1007.1404 , 1120kb)
arXiv:1007.1416 (*cross-listing*)
Date: Thu, 8 Jul 2010 16:55:00 GMT (179kb)

Title: Two-center resonant photo ionization
Authors: B.Najjari, A.B.Voitkiv, C.M\"uller
Categories: physics.atom-ph quant-ph
Comments: 4 pages, 3 figures
   Photoionization of an atom $A$, in the presence of a neighboring atom $B$,
can proceed via resonant excitation of $B$ with subsequent energy transfer to
$A$ through two-center electron-electron correlation. We demonstrate that this
two-center mechanism can strongly outperform direct photoionization at
nanometer internuclear distances and possesses characteristic features in its
time development and the spectrum of emitted electrons.
\\ ( http://arxiv.org/abs/1007.1416 , 179kb)
arXiv:1007.1419 (*cross-listing*)
Date: Thu, 8 Jul 2010 17:07:02 GMT (168kb)

Title: Hyperfine structure of the ground state muonic $^3He$ atom
Authors: A. A. Krutov, A. P. Martynenko (Samara State U.)
Categories: hep-ph physics.atom-ph
Comments: 21 pages, 8 figures
Report-no: SSU-HEP-10/7
   On the basis of the perturbation theory in the fine structure constant
$\alpha$ and the ratio of the electron to muon masses we calculate one-loop
vacuum polarization and electron vertex corrections and the nuclear structure
corrections to the hyperfine splitting of the ground state of muonic helium
atom $(\mu\ e \ ^3_2He)$. We obtain total result for the ground state hyperfine
splitting $\Delta \nu^{hfs}=4166.471$ MHz which improves the previous
calculation of Lakdawala and Mohr due to the account of new corrections of
orders $\alpha^5$ and $\alpha^6$. The remaining difference between our
theoretical result and experimental value of the hyperfine splitting lies in
the range of theoretical and experimental errors and requires the subsequent
investigation of higher order corrections.
\\ ( http://arxiv.org/abs/1007.1419 , 168kb)
Date: Thu, 8 Jul 2010 18:25:39 GMT (10kb)

Title: Unifying approach for fluctuation theorems from joint probability
Authors: Reinaldo Garcia-Garcia, Daniel Dominguez, Vivien Lecomte and Alejandro
   B. Kolton
Categories: cond-mat.stat-mech
   Any decomposition of the total trajectory entropy production for Markovian
systems has a joint probability distribution satisfying a generalized detailed
fluctuation theorem, when all the contributing terms are odd with respect to
time reversal. The expression of the result does not bring into play dual
probability distributions, hence easing potential applications. We show that
several fluctuation theorems for perturbed non-equilibrium steady states are
unified and arise as particular cases of this general result. In particular, we
show that the joint probability distribution of the system and reservoir
trajectory entropies satisfy a detailed fluctuation theorem valid for all times
although each contribution does not do it separately.
\\ ( http://arxiv.org/abs/1007.1435 , 10kb)

The replacements:

replaced with revised version Sat, 3 Jul 2010 00:33:16 GMT (1371kb,D)

Title: Suppression of collisional shifts in a strongly interacting lattice
Authors: Matthew D. Swallows, Michael Bishof, Yige Lin, Sebastian Blatt,
   Michael J. Martin, Ana Maria Rey, and Jun Ye
Categories: quant-ph cond-mat.quant-gas physics.atom-ph
Comments: 11 pages, 5 figures
\\ ( http://arxiv.org/abs/1007.0059 , 1371kb)
replaced with revised version Sun, 4 Jul 2010 12:06:57 GMT (186kb)

Title: Hardcore bosons on the dual of the bowtie lattice
Authors: Wanzhou Zhang, Laixi Li, and Wenan Guo
Categories: cond-mat.str-el cond-mat.quant-gas cond-mat.stat-mech
Comments: 10 figures
\\ ( http://arxiv.org/abs/1003.6070 , 186kb)
replaced with revised version Mon, 5 Jul 2010 10:22:06 GMT (1128kb)

Title: Cold-Atom-Induced Control of an Optomechanical Device
Authors: M. Paternostro, G. De Chiara, and G. M. Palma
Categories: quant-ph cond-mat.quant-gas
Comments: 4 pages, 9 figures. Published version
Journal-ref: Phys. Rev. Lett. 104, 243602 (2010)
DOI: 10.1103/PhysRevLett.104.243602
\\ ( http://arxiv.org/abs/1003.0424 , 1128kb)
arXiv:1007.0100 (*cross-listing*)
replaced with revised version Mon, 5 Jul 2010 15:20:11 GMT (103kb)

Title: Decoherence effects in Bose-Einstein condensate interferometry. I
   General Theory
Authors: B. J. Dalton
Categories: cond-mat.quant-gas quant-ph
Comments: Full version of paper, including all Appendices. Journal version only
   includes Appendix A. Cross references to material in Appendices improved in
   Version 2 (5 July 2010)
\\ ( http://arxiv.org/abs/1007.0100 , 103kb)
replaced with revised version Tue, 6 Jul 2010 04:51:37 GMT (284kb)

Title: Spin-orbit coupling and perpendicular Zeeman field for fermionic cold
   atoms: observation of the intrinsic anomalous Hall effect
Authors: Chuanwei Zhang
Categories: cond-mat.quant-gas cond-mat.mtrl-sci
Comments: 4 pages, 4 figures, minor modification of the laser setup
\\ ( http://arxiv.org/abs/1004.4231 , 284kb)
replaced with revised version Tue, 6 Jul 2010 07:30:30 GMT (397kb)

Title: A nonlinear quantum piston for the controlled generation of vortex rings
Authors: Natalia G. Berloff, Victor M. Perez-Garcia
Categories: cond-mat.quant-gas nlin.PS
\\ ( http://arxiv.org/abs/1006.4426 , 397kb)
replaced with revised version Tue, 6 Jul 2010 13:25:57 GMT (196kb)

Title: Quantum Quenches in an XXZ Spin Chain from a Spatially Inhomogeneous
   Initial State
Authors: Jarrett Lancaster and Aditi Mitra
Categories: cond-mat.quant-gas
Comments: 17 pages, 9 figures. References added. Final published version
Journal-ref: Phys. Rev. E, 81, 061134 (2010)
\\ ( http://arxiv.org/abs/1002.4446 , 196kb)
replaced with revised version Wed, 7 Jul 2010 14:19:38 GMT (54kb)

Title: Nuclear-spin-independent short-range three-body physics in ultracold
Authors: Noam Gross, Zav Shotan, Servaas Kokkelmans and Lev Khaykovich
Categories: cond-mat.quant-gas cond-mat.other
Comments: 4 pages, 2 figures
\\ ( http://arxiv.org/abs/1003.4891 , 54kb)
replaced with revised version Wed, 7 Jul 2010 16:36:23 GMT (104kb)

Title: Breakdown of the superfluidity of a matter wave in a random environment
Authors: M. Albert, T. Paul, N. Pavloff and P. Leboeuf
Categories: cond-mat.quant-gas
Comments: 4 pages, 2 figures, final printed version
Journal-ref: Phys. Rev. A 82, 011602(R) (2010)
\\ ( http://arxiv.org/abs/1003.5808 , 104kb)
replaced with revised version Wed, 7 Jul 2010 19:33:52 GMT (1050kb,D)

Title: Atom interferometry with trapped Bose-Einstein condensates: Impact of
   atom-atom interactions
Authors: Julian Grond, Joerg Schmiedmayer, Ulrich Hohenester
Categories: cond-mat.quant-gas cond-mat.other
Comments: 28 pages, 13 figures, extended and corrected
Journal-ref: New J. Phys. 12, 065036 (2010)
DOI: 10.1088/1367-2630/12/6/065036
\\ ( http://arxiv.org/abs/1002.0265 , 1050kb)
replaced with revised version Thu, 8 Jul 2010 13:24:22 GMT (1870kb)

Title: Stochastic Mean-Field Theory: Method and Application to the Disordered
   Bose-Hubbard Model at Finite Temperature and Speckle Disorder
Authors: Ulf Bissbort, Ronny Thomale, Walter Hofstetter
Categories: cond-mat.dis-nn cond-mat.quant-gas
Comments: 19 pages, 15 figures. Extended definition of Bose glass phase, taking
   collective excitations into account. 1 figure added, extended and updated
Journal-ref: Phys. Rev. A 81, 063643 (2010)
DOI: 10.1103/PhysRevA.81.063643
\\ ( http://arxiv.org/abs/0911.0923 , 1870kb)

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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