Dear subscribers,
This week's selection was compiled by Chao Feng, and contains 27 new
abstracts and 20 replacements.
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arXiv:1008.4603 (*cross-listing*)
Date: Thu, 26 Aug 2010 21:21:27 GMT (705kb)
Title: Local and spatially extended sub-Poisson atom number fluctuations in
optical lattices
Authors: C. Gross, J. Esteve, M. K. Oberthaler, A. D. Martin, J. Ruostekoski
Categories: cond-mat.quant-gas quant-ph
\\
We demonstrate that ultracold interacting bosonic atoms in an optical lattice
show sub-Poissonian on-site and inter-site atom number fluctuations. The
experimental observations agree with numerical predictions of the truncated
Wigner approximation. The correlations persist in the presence of multi-mode
atom dynamics and even over large spatially extended samples involving several
sites and large populations.
\\ ( http://arxiv.org/abs/1008.4603 , 705kb)
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arXiv:1008.4664
Date: Fri, 27 Aug 2010 08:53:48 GMT (1199kb)
Title: Binary quantum turbulence arising from counter-superflow instability in
two-component Bose-Einstein condensates
Authors: Hiromitsu Takeuchi, Shungo Ishino, and Makoto Tsubota
Categories: cond-mat.quant-gas cond-mat.other physics.flu-dyn
Comments: 5 pages, 3 figures
\\
We theoretically study the development of quantum turbulence from two
counter-propagating superfluids of miscible Bose-Einstein condensates by
numerically solving the coupled Gross-Pitaevskii equations. When the relative
velocity exceeds a critical value, the counter-superflow becomes unstable and
quantized vortices are nucleated, which leads to isotropic quantum turbulence
consisting of two superflows. It is shown that the binary turbulence can be
realized experimentally in a trapped system.
\\ ( http://arxiv.org/abs/1008.4664 , 1199kb)
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arXiv:1008.4682
Date: Fri, 27 Aug 2010 09:54:57 GMT (9kb)
Title: Fluctuation indices for atomic systems with Bose-Einstein condensate
Authors: V.I. Yukalov
Categories: cond-mat.quant-gas hep-ph
Comments: Latex file, 12 pages
Journal-ref: Laser Phys. Lett. 7 (2010) 831-836
\\
The notion of fluctuation indices, characterizing thermodynamic stability of
statistical systems, is advanced. These indices are especially useful for
investigating the stability of nonuniform and trapped atomic assemblies. The
fluctuation indices are calculated for several systems with Bose-Einstein
condensate. It is shown that: the ideal uniform Bose-condensed gas is
thermodynamically unstable; trapped ideal gases are stable for the confining
dimension larger than two; trapped gases, under the confining dimension two,
are weakly unstable; harmonically trapped gas is stable only for the spatial
dimension three; one-dimensional harmonically trapped gas is unstable;
two-dimensional gas in a harmonic trap represents a marginal case, being weakly
unstable; interacting nonuniform three-dimensional Bose-condensed gas is
stable. There are no thermodynamically anomalous particle fluctuations in
stable Bose-condensed systems.
\\ ( http://arxiv.org/abs/1008.4682 , 9kb)
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arXiv:1008.4684
Date: Fri, 27 Aug 2010 10:02:14 GMT (1045kb,D)
Title: Flat bands, Dirac cones and atom dynamics in an optical lattice
Authors: V. Apaja, M. Hyrk\"as and M. Manninen
Categories: cond-mat.str-el
Comments: 4 pages, 3 figures
\\
We study atoms trapped with a harmonic confinement in an optical lattice
characterized by a flat band and Dirac cones. We show that such an optical
lattice can be constructed which can be accurately described with the tight
binding or Hubbard models. In the case of fermions the release of the harmonic
confinement removes fast atoms occupying the Dirac cones while those occupying
the flat band remain immobile. Using exact diagonalization and dynamics we
demonstrate that a similar strong occupation of the flat band does not happen
in bosonic case and furthermore that the mean field model is not capable for
describing the dynamics of the boson cloud.
\\ ( http://arxiv.org/abs/1008.4684 , 1045kb)
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arXiv:1008.4732
Date: Fri, 27 Aug 2010 14:34:51 GMT (1770kb,D)
Title: Ground State of Binary Condensates in harmonic and lattice potentials
with variational ansatz
Authors: S. Gautam and D. Angom
Categories: cond-mat.quant-gas
Comments: 12 pages, 9 figures
\\
We propose an ansatz to study binary condensates, trapped in harmonic and
optical lattice potentials, both in miscible and immiscible domains. The ansatz
is an apt one for two reasons. First, it leads to the smooth transition from
miscible to immiscible domains without any apriori assumptions. And second,
unlike other ansatz proposed in the literature, its applicability is not
constrained by interaction strengths and nature of the trapping potential. We
varify the validity of the ansatz with Gram-Charlier expansion as an entirely
indepedent measure based on the numerical results. In optical lattice
potentials, we analyze the squeezing of the density profiles, due to the
increase in the depth of the optical lattice potential. For this we develope a
model with three potential wells, and define the relationship between the
lattice depth and profile of the condensate.
\\ ( http://arxiv.org/abs/1008.4732 , 1770kb)
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arXiv:1008.4752
Date: Fri, 27 Aug 2010 16:20:08 GMT (523kb)
Title: Unconventional superfluid order in the $F$-band of a bipartite optical
square lattice
Authors: Matthias \"Olschl\"ager, Georg Wirth, and Andreas Hemmerich
Categories: cond-mat.quant-gas
Comments: 4 pages, 3 figures
\\
We report on the first observation of bosons condensed into the energy minima
of an $F$-band of a bipartite square optical lattice. Momentum spectra indicate
that a truly complex-valued staggered angular momentum superfluid order is
established. The corresponding wave function is composed of alternating local
$F_{2x^3-3x} + i F_{2y^3-3y}$-orbits and local $S$-orbits residing in the deep
and shallow wells of the lattice, which are arranged as the black and white
areas of a checkerboard. A pattern of staggered vortical currents arises, which
breaks time reversal symmetry and the translational symmetry of the lattice
potential. We have measured the populations of higher order Bragg peaks in the
momentum spectra for varying relative depths of the shallow and deep lattice
wells and find remarkable agreement with band calculations.
\\ ( http://arxiv.org/abs/1008.4752 , 523kb)
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arXiv:1008.4794
Date: Fri, 27 Aug 2010 20:00:04 GMT (329kb)
Title: Generalized Thermalization in Integrable Systems
Authors: Amy C. Cassidy, Charles W. Clark, Marcos Rigol
Categories: cond-mat.stat-mech cond-mat.quant-gas
Comments: 7 pages, 7 figures
\\
Once only of theoretical interest, integrable models of one-dimensional (1D)
quantum many-body systems can now be realized with ultracold atoms. In general,
integrable quantum systems that are initially far from equilibrium cannot
undergo thermal relaxation in the usual way, because they are constrained by
the non-trivial set of conserved quantities that make the system integrable.
Relaxation to a non-thermal state has recently been observed in a cold-atom
system close to integrability. At integrability, it is natural to describe the
observables after relaxation by an updated statistical mechanical ensemble: the
generalized Gibbs ensemble (GGE), which is constructed by maximizing the
entropy subject to the integrability constraints. In recent studies, the GGE
has been found to accurately describe various observables in the final steady
state of integrable systems, but a microscopic understanding of its origin and
applicability remains elusive. Here we provide a justification of the GGE based
on a generalized interpretation of the eigenstate thermalization hypothesis
(ETH), which was previously introduced to explain thermalization of
nonintegrable systems.
\\ ( http://arxiv.org/abs/1008.4794 , 329kb)
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arXiv:1008.4864
Date: Sat, 28 Aug 2010 13:05:14 GMT (2915kb,D)
Title: A synthetic electric force acting on neutral atoms
Authors: Yu-Ju Lin, Robert L. Compton, Karina Jimenez-Garcia, William D.
Phillips, James V. Porto, and Ian B. Spielman
Categories: cond-mat.quant-gas
\\
Electromagnetism is a simple example of a gauge theory where the underlying
potentials -- the vector and scalar potentials -- are defined only up to a
gauge choice. The vector potential generates magnetic fields through its
spatial variation and electric fields through its time-dependence. We
experimentally produce a synthetic gauge field that emerges only at low energy
in a rubidium Bose-Einstein condensate: the neutral atoms behave as charged
particles do in the presence of a homogeneous effective vector potential. We
have generated a synthetic electric field through the time dependence of an
effective vector potential, a physical consequence even though the vector
potential is spatially uniform.
\\ ( http://arxiv.org/abs/1008.4864 , 2915kb)
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arXiv:1008.4876
Date: Sat, 28 Aug 2010 16:19:41 GMT (111kb)
Title: Spontaneous symmetry breaking and collapse in bosonic Josephson
junctions
Authors: Giovanni Mazzarella and Luca Salasnich
Categories: cond-mat.quant-gas nlin.PS
Comments: 5 pages, 4 figures, to be published in Phys. Rev. A
\\
We investigate an attractive atomic Bose-Einstein condensate (BEC) trapped by
a double-well potential in the axial direction and by a harmonic potential in
the transverse directions. We obtain numerically, for the first time, a quantum
phase diagram which includes all the three relevant phases of the system:
Josephson, spontaneous symmetry breaking (SSB), and collapse. We consider also
the coherent dynamics of the BEC and calculate the frequency of
population-imbalance mode in the Josephson phase and in the SSB phase up to the
collapse. We show that these phases can be observed by using ultracold vapors
of 7Li atoms in a magneto-optical trap.
\\ ( http://arxiv.org/abs/1008.4876 , 111kb)
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arXiv:1008.4961
Date: Sun, 29 Aug 2010 21:29:12 GMT (14kb)
Title: Fermions and Disorder in Ising and Related Models in Two Dimensions
Authors: V.N. Plechko
Categories: cond-mat.stat-mech
Comments: 11 pages, 1 table, no figures. The discussion is merely based on a
talk given at the International Bogoliubov Conference on Problems of
Theoretical and Mathematical Physics, MIRAS--JINR, Moscow--Dubna, Russia,
August 21--27, 2009
Report-no: 99215
\\
The aspects of phase transitions in the two-dimensional Ising models modified
by quenched and annealed site disorder are discussed in the framework of
fermionic approach based on the reformulation of the problem in terms of
integrals with anticommuting Grassmann variables.
\\ ( http://arxiv.org/abs/1008.4961 , 14kb)
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arXiv:1008.5005
Date: Mon, 30 Aug 2010 05:19:25 GMT (14kb)
Title: Lattice-induced non-adiabatic frequency shifts in optical lattice clocks
Authors: Kyle Beloy
Categories: physics.atom-ph
Comments: 5 pages
\\
We consider the frequency shift in optical lattice clocks which arises from
the coupling of the electronic motion to the atomic motion within the lattice.
For the simplest of 3-D lattice geometries this coupling is shown to only
affect clocks based on blue-detuned lattices. We have estimated the size of
this shift for the prospective strontium lattice clock operating at the 390 nm
blue-detuned magic wavelength. The resulting fractional frequency shift is
found to be on the order of $10^{-18}$ and is largely overshadowed by the
electric quadrupole shift. For lattice clocks based on more complex geometries
or other atomic systems, this shift could potentially be a limiting factor in
clock accuracy.
\\ ( http://arxiv.org/abs/1008.5005 , 14kb)
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arXiv:1008.5086
Date: Mon, 30 Aug 2010 14:14:40 GMT (381kb)
Title: Crossovers in Unitary Fermi Systems
Authors: Henning Heiselberg
Categories: cond-mat.quant-gas
Comments: 50 pages, 15 figures. Contribution to Lecture Notes in Physics
"BCS-BEC crossover and the Unitary Fermi Gas" edited by W. Zwerger
\\
Universality and crossover is described for attractive and repulsive
interactions where, respectively, the BCS-BEC crossover takes place and a
ferromagnetic phase transition is claimed. Crossovers are also described for
optical lattices and multicomponent systems. The crossovers, universal
parameters and phase transitions are described within the Leggett and NSR
models and calculated in detail within the Jastrow-Slater approximation. The
physics of ultracold Fermi atoms is applied to neutron, nuclear and quark
matter, nuclei and electrons in solids whenever possible. Specifically, the
differences between optical lattices and cuprates is discussed w.r.t.
antiferromagnetic, d-wave superfluid phases and phase separation.
\\ ( http://arxiv.org/abs/1008.5086 , 381kb)
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arXiv:1008.5187 (*cross-listing*)
Date: Mon, 30 Aug 2010 23:40:29 GMT (86kb,D)
Title: How quantum bound states bounce and the structure it reveals
Authors: Dean Lee, Michelle Pine
Categories: nucl-th cond-mat.mes-hall cond-mat.quant-gas
Comments: 4 pages, 3 figures
\\
We investigate how quantum bound states bounce from a hard surface. Our
analysis has applications to ab initio calculations of nuclear structure and
elastic deformation, energy levels of excitons in semiconductor quantum dots
and wells, and cold atomic few-body systems on optical lattices with sharp
boundaries. We develop the general theory of elastic reflection for a composite
body from a hard wall. On the numerical side we present universal results for
two-body states and discuss ab initio calculations for general few-body
systems. On the analytical side we derive a universal effective potential that
gives the reflection scattering length for shallow two-body states.
\\ ( http://arxiv.org/abs/1008.5187 , 86kb)
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arXiv:1008.5191 (*cross-listing*)
Date: Tue, 31 Aug 2010 00:22:42 GMT (250kb)
Title: Entanglement from Charge Statistics: Exact Relations for Many-Body
Systems
Authors: H. Francis Song, Christian Flindt, Stephan Rachel, Israel Klich, and
Karyn Le Hur
Categories: cond-mat.mes-hall quant-ph
\\
We present exact formulas for the entanglement and R\'{e}nyi entropies
generated at a quantum point contact (QPC) in terms of the statistics of charge
fluctuations, which we illustrate with examples from both equilibrium and
non-equilibrium transport. The formulas are also applicable to groundstate
entanglement in systems described by non-interacting fermions in any dimension,
which in one dimension includes the critical spin-1/2 XX and Ising models where
conformal field theory predictions for the entanglement and R\'{e}nyi entropies
are reproduced from the full counting statistics. These results may play a
crucial role in the experimental detection of many-body entanglement in
mesoscopic structures and cold atoms in optical lattices.
\\ ( http://arxiv.org/abs/1008.5191 , 250kb)
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arXiv:1008.5305
Date: Tue, 31 Aug 2010 12:54:47 GMT (273kb)
Title: The finite-temperature thermodynamics of a trapped unitary Fermi gas
within fractional exclusion statistics
Authors: Fang Qin and Ji-sheng Chen
Categories: cond-mat.other
Comments: 6 pages, 6 figures
Journal-ref: J. Phys. B: 43, 055302 (2010)
DOI: 10.1088/0953-4075/43/5/055302
\\
We utilize a fractional exclusion statistics of Haldane and Wu hypothesis to
study the thermodynamics of a unitary Fermi gas trapped in a harmonic
oscillator potential at ultra-low finite temperature. The entropy per particle
as a function of the energy per particle and energy per particle versus
rescaled temperature are numerically compared with the experimental data. The
study shows that, except the chemical potential behavior, there exists a
reasonable consistency between the experimental measurement and theoretical
attempt for the entropy and energy per particle. In the fractional exclusion
statistics formalism, the behavior of the isochore heat capacity for a trapped
unitary Fermi gas is also analyzed.
\\ ( http://arxiv.org/abs/1008.5305 , 273kb)
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arXiv:1008.5320
Date: Tue, 31 Aug 2010 14:03:17 GMT (412kb)
Title: Energy Relaxation in a 1-D Polariton Condensate
Authors: T. C. H. Liew, M. Wouters, and V. Savona
Categories: cond-mat.mes-hall
Comments: 4 pages, 4 figures
\\
We study the kinetics of polariton condensation in microwires accounting for
the condensation process as well as the energy relaxation of condensed
polaritons due to their scattering with phonons and excitons. In the presence
of a local non-resonant optical pump, a dynamic balance between spatially
dependent relaxation and particle loss develops and excites a series of modes,
roughly equally spaced in energy. Upon comparison, excellent agreement is found
with experimental results reported in [E. Wertz, et al., Nature Phys. doi:
10.1038/nphys1750 (2010)].
\\ ( http://arxiv.org/abs/1008.5320 , 412kb)
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arXiv:1008.5349 (*cross-listing*)
Date: Tue, 31 Aug 2010 16:15:23 GMT (10kb)
Title: The Excitation Spectrum for Weakly Interacting Bosons
Authors: Robert Seiringer
Categories: math-ph cond-mat.quant-gas math.MP
Comments: LaTeX, 12 pages
\\
We investigate the low energy excitation spectrum of a Bose gas with weak,
long range repulsive interactions. In particular, we prove that the Bogoliubov
spectrum of elementary excitations with linear dispersion relation for small
momentum becomes exact in the mean-field limit.
\\ ( http://arxiv.org/abs/1008.5349 , 10kb)
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arXiv:1008.5365 (*cross-listing*)
Date: Tue, 31 Aug 2010 17:03:25 GMT (93kb,D)
Title: Layered Quantum Hall Insulators with Ultracold Atoms
Authors: A. Zamora, G. Szirmai and M. Lewenstein
Categories: cond-mat.quant-gas quant-ph
Comments: 4 pages
\\
We consider a generalization of the 2-dimensional (2D) quantum-Hall insulator
to a non-compact, non-Abelian gauge group, the Heisenberg-Weyl group. We show
that this kind of insulator is actually a layered 3D insulator with nontrivial
topology. We further show that nontrivial combinations of quantized transverse
conductivities can be engineered with the help of a staggered potential. We
investigate the robustness and topological nature of this conductivity and
connect it to the surface modes of the system. We also propose a very simple
experimental realization with ultracold atoms in 3D confined to a 2D square
lattice with the third dimension being mapped to a gauge coordinate.
\\ ( http://arxiv.org/abs/1008.5365 , 93kb)
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arXiv:1008.5378 (*cross-listing*)
Date: Tue, 31 Aug 2010 17:51:38 GMT (5929kb,D)
Title: Artificial gauge potentials for neutral atoms
Authors: Jean Dalibard, Fabrice Gerbier, Gediminas Juzeli\=unas,Patrik \"Ohberg
Categories: cond-mat.quant-gas quant-ph
Comments: 21 pages, 9 figures, submitted to Reviews of Modern Physics
(Colloquium)
\\
When a neutral atom moves in a properly designed laser field, its
center-of-mass motion may mimic the dynamics of a charged particle in a
magnetic field, with the emergence of a Lorentz-like force. In this Colloquium
we present the physical principles at the basis of this artificial (synthetic)
magnetism and relate the corresponding Aharonov-Bohm phase to the Berry's phase
that emerges when the atom follows adiabatically one of its dressed states. We
also discuss some manifestations of artificial magnetism for a cold quantum
gas, in particular in terms of vortex nucleation. We then generalise our
analysis to the simulation of non-Abelian gauge potentials and present some
striking consequences, such as the emergence of an effective spin-orbit
coupling. We address both the case of bulk gases and discrete systems, where
atoms are trapped in an optical lattice.
\\ ( http://arxiv.org/abs/1008.5378 , 5929kb)
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arXiv:1008.5388
Date: Tue, 31 Aug 2010 18:54:08 GMT (41kb)
Title: Using off-diagonal confinement as a cooling method
Authors: V.G. Rousseau, K. Hettiarachchilage, M. Jarrell, and J. Moreno
Categories: cond-mat.quant-gas
Comments: 6 pages, 6 figures
\\
In a recent letter [Phys. Rev. Lett. 104, 167201 (2010)] we proposed a new
confining method for ultracold atoms on optical lattices, based on off-diagonal
confinement (ODC). This method was shown to have distinct advantages over the
conventional diagonal confinement (DC) that makes use of a trapping potential,
including the existence of pure Mott phases and highly populated condensates.
In this paper we show that the ODC method can also lead to temperatures that
are smaller than with the conventional DC method, depending on the control
parameters. We determine these parameters using exact diagonalizations for the
hard-core case, then we extend our results to the soft-core case by performing
quantum Monte Carlo (QMC) simulations for both DC and ODC systems at fixed
temperatures, and analysing the corresponding entropies. We also propose a
method for measuring the entropy in QMC simulations.
\\ ( http://arxiv.org/abs/1008.5388 , 41kb)
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arXiv:1009.0016
Date: Tue, 31 Aug 2010 20:05:18 GMT (593kb)
Title: Observation of scale invariance and universality in two-dimensional Bose
gases
Authors: Chen-Lung Hung, Xibo Zhang, Nathan Gemelke, and Cheng Chin
Categories: cond-mat.quant-gas cond-mat.other cond-mat.stat-mech
\\
The collective behavior of a many-body system near a continuous phase
transition is insensitive to the details of its microscopic physics [1].
Characteristic features near the phase transition, called critical phenomena,
are that the thermodynamic observables follow generalized scaling laws [1]. The
Berezinskii-Kosterlitz-Thouless (BKT) phase transition [2, 3] in
two-dimensional (2D) Bose gases presents a particularly interesting case
because the marginal dimensionality and intrinsic scaling symmetry result in a
broad fluctuation regime which manifests itself in an extended range of scale-
invariant and universal behavior. Studies on BKT transition in cold atoms have
stimulated great interest in recent years [4-7], clear demonstration of a
universal behavior near the phase transition, however, has remained an elusive
goal. Here we report the observation of a global invariance of scale and a
universal description of 2D gases with different interaction strengths. The
extracted universal thermodynamic functions confirm the wide critical regime
near the BKT phase transition, provide a sensitive test to Monte Carlo
calculations [8-10], and point toward a growing density-density correlations in
the critical regime. Our assay raises new perspectives to explore further
universal phenomena in the realm of classical and quantum critical physics.
\\ ( http://arxiv.org/abs/1009.0016 , 593kb)
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arXiv:1009.0040
Date: Tue, 31 Aug 2010 22:23:17 GMT (100kb)
Title: Color Superfluid and Trionic State of Attractive Three-Component Lattice
Fermionic Atoms at Finite Temperatures
Authors: Kensuke Inaba and Sei-ichiro Suga
Categories: cond-mat.quant-gas
Comments: 8 pages, 5 figures
\\
We investigate the finite-temperature properties of attractive
three-component (colors) fermionic atoms in optical lattices using a
self-energy functional approach. As the strength of the attractive interaction
increases in the low temperature region, a second order transition occurs from
a Fermi liquid to a color superfluid (CSF). In the strong attractive region, a
first order transition occurs from a CSF to a trionic state. In the high
temperature region, a crossover between a Fermi liquid and a trionic state is
observed with increasing the strength of the attractive interaction. The
crossover region for fixed temperature is almost independent of filling.
\\ ( http://arxiv.org/abs/1009.0040 , 100kb)
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arXiv:1009.0043
Date: Tue, 31 Aug 2010 22:34:52 GMT (393kb,D)
Title: The phase diagram of 2D polar condensates in a magnetic field
Authors: A. J. A. James and A. Lamacraft
Categories: cond-mat.quant-gas
Comments: 4 pages, 7 figures
\\
Spin one condensates in the polar (antiferromagnetic) phase in two dimensions
are shown to undergo a transition of the Ising type, in addition to the
expected Kosterlitz--Thouless (KT) transition of half vortices, due to the
quadratic Zeeman effect. We establish the phase diagram in terms of temperature
and the strength of the Zeeman effect using Monte Carlo simulations. When the
Zeeman effect is sufficiently strong the Ising and KT transitions merge. For
very strong Zeeman field the remaining transition is of the familiar integer KT
type.
\\ ( http://arxiv.org/abs/1009.0043 , 393kb)
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arXiv:1009.0095 (*cross-listing*)
Date: Wed, 1 Sep 2010 05:52:43 GMT (809kb)
Title: Stark-tuned F\"orster resonance and dipole blockade between 2 to 5 cold
Rydberg atoms: Monte-Carlo simulations for various spatial configurations
Authors: I.I.Ryabtsev, D.B.Tretyakov, I.I.Beterov, V.M.Entin, and E.A.Yakshina
Categories: quant-ph cond-mat.quant-gas physics.atom-ph
Comments: 11 pages, 7 figures, submitted to PRA
\\
Results of the numerical Monte-Carlo simulations for the Stark-tuned
F\"orster resonance and dipole blockade between 2 to 5 cold rubidium Rydberg
atoms in various spatial configurations are presented. Effect of the atom
spatial uncertainties on the resonance amplitude and spectrum is investigated.
Feasibility to observe coherent Rabi-like population oscillations at a
F\"orster resonance between two cold Rydberg atoms is analyzed. Spectra and
fidelity of the Rydberg dipole blockade are calculated for various experimental
conditions, including nonzero detuning from the F\"orster resonance and finite
laser line width. The results are discussed in the context of quantum
information processing with Rydberg atoms.
\\ ( http://arxiv.org/abs/1009.0095 , 809kb)
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arXiv:1009.0194 (*cross-listing*)
Date: Wed, 1 Sep 2010 14:49:38 GMT (1106kb,D)
Title: Non-equilibrium dynamics of bosonic atoms in optical lattices:
Decoherence of many-body states due to spontaneous emission
Authors: H. Pichler, A. J. Daley, P. Zoller
Categories: cond-mat.quant-gas quant-ph
Comments: 17 pages, 14 figures
\\
We analyze in detail the heating of bosonic atoms in an optical lattice due
to incoherent scattering of light from the lasers forming the lattice. Because
atoms scattered into higher bands do not thermalize on the timescale of typical
experiments, this process cannot be described by the total energy increase in
the system alone (which is determined by single-particle effects). The heating
instead involves an important interplay between the atomic physics of the
heating process and the many-body physics of the state. We characterize the
effects on many-body states for various system parameters, where we observe
important differences in the heating for strongly and weakly interacting
regimes, as well as a strong dependence on the sign of the laser detuning from
the excited atomic state. We compute heating rates and changes to
characteristic correlation functions based both on perturbation theory
calculations, and a time-dependent calculation of the dissipative many-body
dynamics. The latter is made possible for 1D systems by combining
time-dependent density matrix renormalization group (t-DMRG) methods with
quantum trajectory techniques.
\\ ( http://arxiv.org/abs/1009.0194 , 1106kb)
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arXiv:1009.0349
Date: Thu, 2 Sep 2010 08:29:38 GMT (362kb)
Title: FFLO states and quantum oscillations in mesoscopic superconductors and
superfluid ultracold Fermi gases
Authors: A.V.Samokhvalov, A.S.Mel'nikov, A.I.Buzdin
Categories: cond-mat.quant-gas
Comments: 11 pages, 5 figures, Submitted to PRA
\\
We have studied the distinctive features of the
Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) instability and phase transitions in
two--dimensional (2D) mesoscopic superconductors placed in magnetic field of
arbitrary orientation and rotating superfluid Fermi gases with imbalanced state
populations. Using a generalized version of the phenomenological
Ginzburg-Landau theory we have shown that the FFLO states are strongly modified
by the effect of the trapping potential confining the condensate. The
phenomenon of the inhomogeneous state formation is determined by the interplay
of three length scales: (i) length scale of the FFLO instability; (ii) 2D
system size; (iii) length scale associated with the orbital effect caused
either by the Fermi condensate rotation or magnetic field component applied
perpendicular to the superconducting disc. We have studied this interplay and
resulting quantum oscillation effects in both superconducting and superfluid
finite -- size systems with FFLO instability and described the hallmarks of the
FFLO phenomenon in a restricted geometry. The finite size of the system is
shown to affect strongly the conditions of the observability of switching
between the states with different vorticities.
\\ ( http://arxiv.org/abs/1009.0349 , 362kb)
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arXiv:1009.0483
Date: Thu, 2 Sep 2010 17:33:55 GMT (394kb)
Title: Dissipative defect modes in periodic structures
Authors: Yaroslav V. Kartashov, Vladimir V. Konotop, Victor A. Vysloukh, Lluis
Torner
Categories: physics.optics
Comments: 4 pages, 3 figures
Journal-ref: Optics Letters 35, 1638 (2010)
\\
We show that periodic optical lattices imprinted in cubic nonlinear media
with strong two-photon absorption and localized linear gain landscapes support
stable dissipative defect modes in both focusing and defocusing media. Their
shapes and transverse extent are determined by the propagation constant that
belongs to a gap of the lattice spectrum which, in turn, is determined by the
relation between gain and losses. One-hump and two-hump dissipative defect
modes are obtained.
\\ ( http://arxiv.org/abs/1009.0483 , 394kb)
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arXiv:1008.2096 (*cross-listing*)
replaced with revised version Fri, 27 Aug 2010 01:09:00 GMT (228kb)
Title: Dynamic localization of cold atoms in driven lattices: an overlooked
phase
Authors: K. Kudo and T.S. Monteiro
Categories: cond-mat.quant-gas quant-ph
Comments: 5 pages, 2 figures
\\ ( http://arxiv.org/abs/1008.2096 , 228kb)
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arXiv:1004.2567
replaced with revised version Fri, 27 Aug 2010 15:04:38 GMT (98kb)
Title: Effective field theory and dispersion law of the phonons of a
non-relativistic superfluid
Authors: Miguel \'Angel Escobedo and Cristina Manuel
Categories: cond-mat.quant-gas hep-ph
Comments: 14 pages, 2 figures. References added
Journal-ref: Phys. Rev. A 82, 023614 (2010)
DOI: 10.1103/PhysRevA.82.023614
\\ ( http://arxiv.org/abs/1004.2567 , 98kb)
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arXiv:1007.4038
replaced with revised version Sun, 29 Aug 2010 22:55:59 GMT (4195kb)
Title: Robust Mesoscopic Superposition of Strongly Correlated Ultracold Atoms
Authors: David W. Hallwood, Thomas Ernst, Joachim Brand
Categories: quant-ph cond-mat.quant-gas
Comments: 4 pages, 3 figures
\\ ( http://arxiv.org/abs/1007.4038 , 4195kb)
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arXiv:0911.0890
replaced with revised version Mon, 30 Aug 2010 22:47:46 GMT (474kb)
Title: Phase diagram of the hardcore Bose-Hubbard model on a checkerboard
superlattice
Authors: Itay Hen, M. Iskin, Marcos Rigol
Categories: cond-mat.quant-gas cond-mat.stat-mech cond-mat.str-el
Comments: 11 pages, 7 figures
Journal-ref: Phys. Rev. B 81, 064503 (2010)
DOI: 10.1103/PhysRevB.81.064503
\\ ( http://arxiv.org/abs/0911.0890 , 474kb)
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arXiv:1004.3111
replaced with revised version Tue, 31 Aug 2010 05:42:09 GMT (496kb)
Title: Cooper pairing and BCS-BEC evolution in mixed-dimensional Fermi gases
Authors: M. Iskin and A. L. Subasi
Categories: cond-mat.quant-gas cond-mat.supr-con
Comments: 9 pages with 4 figures
\\ ( http://arxiv.org/abs/1004.3111 , 496kb)
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arXiv:0912.2743 (*cross-listing*)
replaced with revised version Tue, 31 Aug 2010 10:18:54 GMT (91kb)
Title: Fast Converging Path Integrals for Time-Dependent Potentials
Authors: Antun Balaz, Ivana Vidanovic, Aleksandar Bogojevic, Axel Pelster
Categories: cond-mat.stat-mech cond-mat.other cond-mat.quant-gas hep-th
physics.comp-ph quant-ph
Comments: 19 pages, 9 figures
\\ ( http://arxiv.org/abs/0912.2743 , 91kb)
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arXiv:0911.1688
replaced with revised version Tue, 31 Aug 2010 15:08:47 GMT (18kb)
Title: Two-Cooper-pair problem and the Pauli exclusion principle
Authors: W. V. Pogosov, M. Combescot, M. Crouzeix
Categories: cond-mat.supr-con cond-mat.quant-gas
Comments: 9 pages, no figures, final version
Journal-ref: Phys. Rev. B 81, 174514 (2010)
DOI: 10.1103/PhysRevB.81.174514
\\ ( http://arxiv.org/abs/0911.1688 , 18kb)
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arXiv:1006.5314 (*cross-listing*)
replaced with revised version Tue, 31 Aug 2010 15:39:12 GMT (62kb)
Title: Photoassociation of a cold atom-molecule pair: long-range
quadrupole-quadrupole interactions
Authors: M. Lepers, O. Dulieu, and V. Kokoouline
Categories: quant-ph physics.atom-ph physics.chem-ph
Comments: 5 figures
\\ ( http://arxiv.org/abs/1006.5314 , 62kb)
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arXiv:1004.4581
replaced with revised version Tue, 31 Aug 2010 22:26:47 GMT (171kb)
Title: Quantum de-mixing in binary mixtures of dipolar bosons
Authors: Piyush Jain and Massimo Boninsegni
Categories: cond-mat.quant-gas
Comments: 6 figures
\\ ( http://arxiv.org/abs/1004.4581 , 171kb)
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arXiv:1006.4674 (*cross-listing*)
replaced with revised version Wed, 1 Sep 2010 00:15:47 GMT (524kb,D)
Title: Spin gradient demagnetization cooling of ultracold atoms
Authors: Patrick Medley, David M. Weld, Hirokazu Miyake, David E. Pritchard,
and Wolfgang Ketterle
Categories: cond-mat.quant-gas physics.atom-ph
Comments: 10 pages, 4 figures; (v2) Shortened and edited for clarity
\\ ( http://arxiv.org/abs/1006.4674 , 524kb)
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arXiv:0908.3547
replaced with revised version Wed, 1 Sep 2010 05:12:24 GMT (130kb)
Title: Quasiparticle excitations in Bose-Fermi mixtures
Authors: Shimul Akhanjee
Categories: cond-mat.quant-gas cond-mat.stat-mech
Comments: 9 pages, 6 eps figures. Version accepted for publication
Journal-ref: Phys. Rev. B 82, 075138 (2010)
DOI: 10.1103/PhysRevB.82.075138
\\ ( http://arxiv.org/abs/0908.3547 , 130kb)
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arXiv:1006.0636
replaced with revised version Wed, 1 Sep 2010 11:51:32 GMT (816kb)
Title: Stabilization and pumping of giant vortices in dilute Bose-Einstein
condensates
Authors: Pekko Kuopanportti and Mikko M\"ott\"onen
Categories: cond-mat.quant-gas
Comments: 8 pages, 6 figures (of which 5 in color)
\\ ( http://arxiv.org/abs/1006.0636 , 816kb)
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arXiv:0910.1749 (*cross-listing*)
replaced with revised version Wed, 1 Sep 2010 14:36:48 GMT (202kb)
Title: Fermionisation dynamics of a strongly interacting 1D Bose gas after an
interaction quench
Authors: Dominik Muth, Bernd Schmidt, and Michael Fleischhauer
Categories: quant-ph cond-mat.quant-gas physics.comp-ph
Comments: 11 pages, 5 figures, extended
Journal-ref: New Journal of Physics 12, 083065 (2010)
DOI: 10.1088/1367-2630/12/8/083065
\\ ( http://arxiv.org/abs/0910.1749 , 202kb)
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arXiv:1003.0600
replaced with revised version Wed, 1 Sep 2010 15:42:30 GMT (41kb,D)
Title: Atom-Dimer Scattering in a Three-Component Fermi Gas
Authors: T. Lompe, T. B. Ottenstein, F. Serwane, K. Viering, A. N. Wenz, G.
Z\"urn and S. Jochim
Categories: cond-mat.quant-gas
Comments: 5 pages, 3 figures
\\ ( http://arxiv.org/abs/1003.0600 , 41kb)
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arXiv:1004.0510
replaced with revised version Wed, 1 Sep 2010 19:47:22 GMT (50kb)
Title: Dynamical mean field solution of the Bose-Hubbard model
Authors: Peter Anders, Emanuel Gull, Lode Pollet, Matthias Troyer, Philipp
Werner
Categories: cond-mat.str-el cond-mat.quant-gas
Comments: 11 pages, 3 figures
Journal-ref: Phys. Rev. Lett. 105, 096402 (2010)
\\ ( http://arxiv.org/abs/1004.0510 , 50kb)
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arXiv:0909.4556
replaced with revised version Wed, 1 Sep 2010 21:04:58 GMT (116kb)
Title: Comment on "Quenches in quantum many-body systems: One-dimensional
Bose-Hubbard model reexamined" [arXiv:0810.3720]
Authors: Marcos Rigol
Categories: cond-mat.stat-mech cond-mat.quant-gas
Comments: 2 pages, 1 figure, as published
Journal-ref: Phys. Rev. A 82, 037601 (2010)
DOI: 10.1103/PhysRevA.82.037601
\\ ( http://arxiv.org/abs/0909.4556 , 116kb)
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arXiv:1008.4610 (*cross-listing*)
replaced with revised version Thu, 2 Sep 2010 02:33:54 GMT (172kb,D)
Title: Thermometry and Refrigeration in a Two-Component Mott Insulator of
Ultracold Atoms
Authors: David M. Weld, Hirokazu Miyake, Patrick Medley, David E. Pritchard,
Wolfgang Ketterle
Categories: cond-mat.quant-gas physics.atom-ph
Comments: 5 pages, 5 figures (v2): Edited for clarity
\\ ( http://arxiv.org/abs/1008.4610 , 172kb)
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arXiv:1008.2260 (*cross-listing*)
replaced with revised version Thu, 2 Sep 2010 06:23:11 GMT (1425kb,D)
Title: The Efimov effect in lithium 6
Authors: Pascal Naidon and Masahito Ueda
Categories: cond-mat.quant-gas physics.atom-ph
Comments: 12 pages, 8 figures Corrected erroneous statement after Eq. (5)
\\ ( http://arxiv.org/abs/1008.2260 , 1425kb)
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arXiv:0912.3531 (*cross-listing*)
replaced with revised version Thu, 2 Sep 2010 09:00:51 GMT (404kb,D)
Title: Universality in dissipative Landau-Zener transitions
Authors: Peter P. Orth, Adilet Imambekov, Karyn Le Hur
Categories: cond-mat.other cond-mat.quant-gas quant-ph
Comments: 5 pages, 2 figs; added finite temperature results
\\ ( http://arxiv.org/abs/0912.3531 , 404kb)
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arXiv:1003.5235
replaced with revised version Thu, 2 Sep 2010 15:14:25 GMT (82kb)
Title: Two-body recombination in a quantum mechanical lattice gas: Entropy
generation and probing of short-range magnetic correlations
Authors: Stefan K. Baur, Erich J. Mueller
Categories: cond-mat.quant-gas
Comments: 6 pages, 3 figures - v4, published version
Journal-ref: Phys. Rev. A 82, 023626 (2010)
DOI: 10.1103/PhysRevA.82.023626
\\ ( http://arxiv.org/abs/1003.5235 , 82kb)
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Till next time,
Matt.
--
=========================================================================
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
http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/
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