[Matts-arxiv] Matt's arXiv selection: week ending 15 October 2010

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Mon, 8 Nov 2010 23:12:00 +1000

Dear subscribers,

This week's selection was compiled by a Mike Garrett, and contains 33 new
abstracts and 23 replacements.

arXiv:1009.4646 (*cross-listing*)
Date: Thu, 23 Sep 2010 15:54:20 GMT (20kb)

Title: Dynamical simulation of integrable and non-integrable models in the
   Heisenberg picture
Authors: Dominik Muth, Razmik Unanyan, and Michael Fleischhauer
Categories: quant-ph cond-mat.other
Comments: 4 pages, 2 figures
   The numerical simulation of quantum many-body dynamics is typically limited
by the linear growth of entanglement with time requiring exponentially
increasing computational ressources to reach a given accuracy. Recently
numerical studies have shown, however, that for 1D Bethe-integrable models the
simulation of local operators in the Heisenberg picture can be much more
efficient as the corresponding operator-space entanglement growsonly
logarithmically with time. Using the spin-1/2 XX chain as generic example of an
integrabel model that can be mapped to free particles, we here provide a simple
explanation of this behaviour. Furthermore we show that the same reduction of
numerical complexity applies to operators that have a high-temperature auto
correlation function which decays slower than exponential, i.e. with a power
law. This is amongst others the case for models where the Blombergen-De Gennes
conjecture of high-temperature diffusive dynamics holds. Thus efficient
simulability may already be implied by a single conservation law (like that of
total magnetization), as we will illustrate numerically for the spin-1 XXZ
\\ ( http://arxiv.org/abs/1009.4646 , 20kb)
Date: Thu, 7 Oct 2010 20:00:21 GMT (656kb,D)

Title: Inter-band coupling induced novel condensates in a double-well lattice
Authors: Qi Zhou, J. V. Porto, and S. Das Sarma
Categories: cond-mat.quant-gas
Comments: 4 pages, 2 figures
   We predict novel inter-band physics for bosons in a double-well lattice. An
intrinsic coupling between the s and px band due to interaction gives rise to
larger Mott regions on the phase diagram at even fillings than the ones at odd
fillings. On the other hand, the ground state can form various types of
condensates, including a mixture of single-particle condensates of both bands,
a mixture of a single-particle condensate of one band and a pair-condensate of
the other band, and a pair-condensate composed of one particle from one band
and one hole from the other band. The predicted phenomena should be observable
in current experiments on double-well optical lattices.
\\ ( http://arxiv.org/abs/1010.1534 , 656kb)
Date: Fri, 8 Oct 2010 10:05:49 GMT (891kb)

Title: Ground states of trapped spin-1 condensates in magnetic field
Authors: Michal Matuszewski
Categories: cond-mat.quant-gas
   We consider a spin-1 Bose-Einstein condensate trapped in a harmonic potential
under the influence of a homogeneous magnetic field. We investigate spatial and
spin structure of the mean-field ground states under constraints on the number
of atoms and the total magnetization. We show that the trapping potential can
make the antiferromagnetic condensate separate into three, and ferromagnetic
condensate into two distinct phases. In the ferromagnetic case, the
magnetization is located in the center of the harmonic trap, while in the
antiferromagnetic case magnetized phases appear in the outer regions. We
describe how the transition from the Thomas-Fermi regime to the single-mode
approximation regime with decreasing number of atoms results in the
disappearance of the domains. We suggest that the ground states can be created
in experiment by adiabatically changing the magnetic field strength.
\\ ( http://arxiv.org/abs/1010.1643 , 891kb)
Date: Fri, 8 Oct 2010 10:47:39 GMT (619kb)

Title: Quantum interference in a four-level system of a $^{87}\mathrm{Rb}$
   atom: Effects of spontaneously generated coherence
Authors: Dongsheng Wang and Yujun Zheng
Categories: quant-ph physics.atom-ph
Comments: 9 pages, 5 figures
   In this work, the effects of quantum interference and spontaneously generated
coherence (SGC) are theoretically analyzed in a four level system of a
$^{87}\mathrm{Rb}$ atom. For the effects of SGC, we find that a new kind of EIT
channel can be induced due to destructive interference, and the nonlinear Kerr
absorption can be coherently narrowed or eliminated under different strengths
of the coupling and switching fields.
\\ ( http://arxiv.org/abs/1010.1657 , 619kb)
arXiv:1010.1671 (*cross-listing*)
Date: Fri, 8 Oct 2010 11:52:06 GMT (69kb)

Title: Engineering of Landau-Zener tunneling
Authors: Ghazal Tayebirad, Riccardo Mannella and Sandro Wimberger
Categories: cond-mat.quant-gas quant-ph
   Several ways are discussed how to control the Landau–Zener tunneling in the
Wannier–Stark system. We focus on a realization of this system with interacting
and noninteracting ultracold bosons. The tunneling from the ground band to the
continuum is shown to depend crucially on the initial condition and system
parameters and, more interestingly, on added timedependent disorder – noise –
on the lattice beams.
\\ ( http://arxiv.org/abs/1010.1671 , 69kb)
arXiv:1010.1716 (*cross-listing*)
Date: Fri, 8 Oct 2010 15:34:35 GMT (25kb)

Title: Dirac Equation For Cold Atoms In Artificial Curved Spacetimes
Authors: O. Boada, A. Celi, J. I. Latorre and M. Lewenstein
Categories: cond-mat.quant-gas cond-mat.str-el hep-th quant-ph
Comments: 12 pages
   We argue that the Fermi-Hubbard Hamiltonian describing the physics of
ultracold atoms on optical lattices in the presence of artificial non-Abelian
gauge fields, is exactly equivalent to the gauge theory Hamiltonian describing
Dirac fermions in the lattice. We show that it is possible to couple the Dirac
fermions to an "artificial" gravitational field, i.e. to consider the Dirac
physics in a curved spacetime. We identify the special class of spacetime
metrics that admit a simple realization in terms of a Fermi-Hubbard model
subjected to an artificial $SU(2)$ field, corresponding to position dependent
hopping matrices. As an example, we discuss in more detail the physics of 2+1D
Rindler metric, its possible experimental realization and detection.
\\ ( http://arxiv.org/abs/1010.1716 , 25kb)
Date: Fri, 8 Oct 2010 16:24:22 GMT (818kb)

Title: Simulating quantum-optical phenomena with cold atoms in optical lattices
Authors: Carlos Navarrete-Benlloch, In\'es de Vega, Diego Porras, and J.
   Ignacio Cirac
Categories: quant-ph
   We propose a scheme involving cold atoms trapped in optical lattices to
observe different phenomena traditionally linked to quantum-optical systems.
The basic idea consists of connecting the trapped atomic state to a non-trapped
state through a Raman scheme. The coupling between these two types of atoms
(trapped and free) turns out to be similar to that describing light-matter
interaction within the rotating-wave approximation, the role of matter and
photons being played by the trapped and free atoms, respectively. We explain in
particular how to observe phenomena arising from the collective spontaneous
emission of atomic and harmonic oscillator samples such as superradiance and
directional emission. We also show how the same setup can simulate Bose-Hubbard
Hamiltonians with extended hopping as well as Ising models with long-range
interactions. We believe that this system can be realized with state of the art
\\ ( http://arxiv.org/abs/1010.1730 , 818kb)
arXiv:1010.1744 (*cross-listing*)
Date: Fri, 8 Oct 2010 17:27:53 GMT (943kb,D)

Title: Analytical solution to position dependent mass Schr\"odinger equation
Authors: Pankaj K. Jha, Hichem Eleuch and Yuri V. Rostovtsev
Categories: cond-mat.other physics.atom-ph quant-ph
Comments: 5 pages, 4 figures
   Using a recently developed technique to solve Schr\"odinger equation for
constant mass, we studied the regime in which mass varies with position i.e
position dependent mass Schr\"odinger equation(PDMSE). We obtained an
analytical solution for the PDMSE and applied our approach to study a position
dependent mass $m(x)$ particle scattered by a potential $\mathcal{V}(x)$. We
also studied the structural analogy between PDMSE and two-level atomic system
interacting with a classical field.
\\ ( http://arxiv.org/abs/1010.1744 , 943kb)
Date: Fri, 8 Oct 2010 20:00:08 GMT (558kb)

Title: Collapse and revival oscillations as a probe for the tunneling amplitude
   in an ultra-cold Bose gas
Authors: F. Alexander Wolf, Itay Hen, and Marcos Rigol
Categories: cond-mat.quant-gas
Comments: 10 pages, 12 figures
Journal-ref: Phys. Rev. A 82, 043601 (2010)
DOI: 10.1103/PhysRevA.82.043601
   We present a theoretical study of the quantum corrections to the revival time
due to finite tunneling in the collapse and revival of matter wave interference
after a quantum quench. We study hard-core bosons in a superlattice potential
and the Bose-Hubbard model by means of exact numerical approaches and
mean-field theory. We consider systems without and with a trapping potential
present. We show that the quantum corrections to the revival time can be used
to accurately determine the value of the hopping parameter in experiments with
ultracold bosons in optical lattices.
\\ ( http://arxiv.org/abs/1010.1776 , 558kb)
Date: Fri, 8 Oct 2010 20:34:04 GMT (205kb)

Title: Suppression of Faraday waves in a Bose-Einstein condensate in the
   presence of an optical lattice
Authors: Pablo Capuzzi, Mario Gattobigio, and Patrizia Vignolo
Categories: cond-mat.quant-gas
   We study the formation of Faraday waves in an elongated Bose-Einstein
condensate in presence of a one-dimensional optical lattice, where phonons are
parametrically excited by modulating the radial confinement of the condensate.
For very shallow optical lattices, phonons with a well-defined wave vector
propagate along the condensate, as in the absence of the lattice, and we
observe the formation of a Faraday pattern. By increasing the potential depth,
the local sound velocity decreases and when it equals the condensate local
phase velocity, the condensate becomes dynamically unstable and the parametric
excitation of Faraday waves is suppressed.
\\ ( http://arxiv.org/abs/1010.1778 , 205kb)
Date: Fri, 8 Oct 2010 21:02:10 GMT (414kb)

Title: Tunable exciton-phonon interactions in an optical lattice of polar
Authors: Felipe Herrera and Roman V. Krems
Categories: physics.atom-ph physics.chem-ph quant-ph
Comments: 5 pages, 5 figures
   We show that an ensemble of polar molecules trapped in an optical lattice can
be considered as a controllable open quantum system. The coupling between
collective rotational excitations and the center-of-mass vibrations of the
molecules in the lattice potential can be controlled by varying the strength
and orientation of an external dc electric field, as well as the intensity of
the trapping laser. The system can be described by a generalized Holstein
Hamiltonian with tunable parameters. As an example, we consider an ensemble of
LiCs molecules to show that the electric field can modify the character of
rotational excitation energy transfer.
\\ ( http://arxiv.org/abs/1010.1782 , 414kb)
Date: Sat, 9 Oct 2010 03:41:40 GMT (391kb)

Title: Landau-Ginzburg Perspective of Finite-Temperature Phase Diagrams of a
   Two-Component Fermi-Bose Mixture
Authors: Michael Fodor and Hong Y. Ling
Categories: cond-mat.quant-gas
Comments: To appear in Physical Review A
   We consider a mixture of two-component Fermi and (one-component) bose gases
under the repulsive Bose-Fermi and attractive Fermi-Fermi interaction. We
perform a systematic study of the finite-temperature phase diagrams in the
chemical potential space, identifying, using the Landau-Ginzburg theory, the
features generic to the phase diagrams within the validity of our model. We
apply the theory to explore the physics of correlated BCS pairing among
fermions in a tightly confined trap surrounded by a large BEC gas.
\\ ( http://arxiv.org/abs/1010.1808 , 391kb)
Date: Sat, 9 Oct 2010 06:41:24 GMT (1267kb)

Title: Dynamic Many-Body Theory. II. Dynamics of Strongly Correlated Fermi
Authors: H. M. B\"ohm, R. Holler, E. Krotscheck, M. Panholzer
Categories: cond-mat.other
Comments: submitted to Phys. Rev. B
   We develop a systematic theory of multi-particle excitations in strongly
interacting Fermi systems. Our work is the generalization of the time-honored
work by Jackson, Feenberg, and Campbell for bosons, that provides, in its most
advanced implementation, quantitative predictions for the dynamic structure
function in the whole experimentally accessible energy/momentum regime. Our
view is that the same physical effects -- namely fluctuations of the wave
function at an atomic length scale -- are responsible for the correct
energetics of the excitations in both Bose and Fermi fluids. Besides a
comprehensive derivation of the fermion version of the theory and discussion of
the approximations made, we present results for homogeneous He-3 and electrons
in three dimensions. We find indeed a significant lowering of the zero sound
mode in He-3 and a broadening of the collective mode due to the coupling to
particle-hole excitations in good agreement with experiments. The most visible
effect in electronic systems is the appearance of a ``double-plasmon''
\\ ( http://arxiv.org/abs/1010.1816 , 1267kb)
arXiv:1010.1874 (*cross-listing*)
Date: Sat, 9 Oct 2010 21:32:04 GMT (507kb,D)

Title: Speckle Imaging of Spin Fluctuations in a Strongly Interacting Fermi Gas
Authors: Christian Sanner, Edward J. Su, Aviv Keshet, Wujie Huang, Jonathon
   Gillen, Ralf Gommers, and Wolfgang Ketterle
Categories: cond-mat.quant-gas physics.atom-ph
   Spin fluctuations and density fluctuations are studied for a two-component
gas of strongly interacting fermions along the BEC-BCS crossover. This is done
by in-situ imaging of dispersive speckle patterns. Compressibility and magnetic
susceptibility are determined from the measured fluctuations. This new
sensitive method easily resolves a tenfold suppression of spin fluctuations
below shot noise due to pairing, and can be applied to novel magnetic phases in
optical lattices.
\\ ( http://arxiv.org/abs/1010.1874 , 507kb)
Date: Sun, 10 Oct 2010 18:52:10 GMT (113kb)

Title: Measurement of an Efimov trimer binding energy in a three-component
   mixture of 6Li
Authors: Shuta Nakajima, Munekazu Horikoshi, Takashi Mukaiyama, Pascal Naidon,
   and Masahito Ueda
Categories: cond-mat.quant-gas
Comments: 4 pages, 4 figures
   The binding energy of an Efimov trimer state was precisely determined via
radio-frequency association. It is found that the measurement results
significantly shift with temperature, but that the shift can be made negligible
at the lowest temperature in our experiment. The obtained trimer binding energy
reveals a significant deviation from the nonuniversal theory prediction based
on a three-body parameter with a monotonic energy dependence.
\\ ( http://arxiv.org/abs/1010.1954 , 113kb)
Date: Mon, 11 Oct 2010 08:14:17 GMT (2534kb)

Title: Precision measurement of gravity with cold atoms in an optical lattice
   and comparison with a classical gravimeter
Authors: N. Poli, F.-Y. Wang, M. G. Tarallo, A. Alberti, M. Prevedelli, G. M.
Categories: physics.atom-ph
Comments: 4 pages, 4 figures
   We report on a high precision measurement of gravitational acceleration using
ultracold strontium atoms trapped in a vertical optical lattice. Using
amplitude modulation of the lattice intensity, an uncertainty $\Delta g /g
\approx 10^{-7}$ was reached by measuring at the 5$^{th}$ harmonic of the Bloch
oscillation frequency. After a careful analysis of systematic effects, the
value obtained with this microscopic quantum system is consistent with the one
we measured with a classical absolute gravimeter at the same location. This
result is of relevance for the recent interpretation of related experiments as
tests of gravitational redshift and opens the way to new tests of gravity at
micrometer scale.
\\ ( http://arxiv.org/abs/1010.2033 , 2534kb)
Date: Mon, 11 Oct 2010 13:01:53 GMT (266kb,D)

Title: Inelastic chaotic scattering on a Bose-Einstein condensate
Authors: Stefan Hunn, Moritz Hiller, Andreas Buchleitner, Doron Cohen,
   Tsampikos Kottos
Categories: quant-ph cond-mat.quant-gas
Comments: 4 pages, 4 figures
   We devise a microscopic scattering approach to probe the excitation spectrum
of a Bose-Einstein condensate. We show that the experimentally accessible
scattering cross section exhibits universal Ericson fluctuations, with
characteristic properties rooted in the underlying classical field equations.
\\ ( http://arxiv.org/abs/1010.2092 , 266kb)
arXiv:1010.2100 (*cross-listing*)
Date: Mon, 11 Oct 2010 13:35:40 GMT (408kb)

Title: Development of instability of dark solitons generated by a flow of
   Bose-Einstein condensate past a concave corner
Authors: A. M. Kamchatnov and S. V. Korneev
Categories: nlin.PS cond-mat.quant-gas
Comments: 4 pages, 2 figures, 1 table
   The stability of dark solitons generated by a supersonic flow of a
Bose-Einstein condensate past a concave corner (or a wedge) is studied. It is
shown that solitons in the dispersive shock wave generated at the initial
moment of time demonstrate a snake instability during their evolution to
stationary curved solitons. Time of decay of soliton to vortices agrees very
well with analytical estimates of the instability growth rate.
\\ ( http://arxiv.org/abs/1010.2100 , 408kb)
Date: Mon, 11 Oct 2010 14:51:57 GMT (410kb)

Title: Cascade coherence transfer and magneto-optical resonances at 455 nm
   excitation of Cesium
Authors: Marcis Auzinsh, Ruvin Ferber, Florian Gahbauer, Andrey Jarmola,
   Linards Kalvans, and Aigars Atvars
Categories: physics.atom-ph
Comments: 12 pages, 8 figures
   We present and experimental and theoretical study of nonlinear
magneto-optical resonances observed in the fluorescence to the ground state
from the 7P_{3/2} state of cesium, which was populated directly by laser
radiation at 455 nm, and from the 6P_{1/2} and 6P_{3/2} states, which were
populated via cascade transitions that started from the 7P_{3/2} state and
passed through various intermediate states. The laser-induced fluorescence
(LIF) was observed as the magnetic field was scanned through zero. Signals were
recorded for the two orthogonal, linearly polarized components of the LIF. We
compared the measured signals with the results of calculations from a model
that was based on the optical Bloch equations and averaged over the Doppler
profile. This model was adapted from a model that had been developed for D_1
and D_2 excitation of alkali metal atoms. The calculations agree quite well
with the measurements, especially when taking into account the fact that some
experimental parameters were only estimated in the model.
\\ ( http://arxiv.org/abs/1010.2123 , 410kb)
Date: Mon, 11 Oct 2010 20:00:02 GMT (758kb,D)

Title: Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by
   Bragg Scattering
Authors: U. Bissbort, Y. Li, S. G\"otze, J. Heinze, J. S. Krauser, M. Weinberg,
   C. Becker, K. Sengstock, W. Hofstetter
Categories: cond-mat.quant-gas
Comments: 4 pages, 3 figures
   We report the first detection of the Higgs-type amplitude mode using Bragg
spectroscopy in a strongly interacting condensate of ultracold atoms in an
optical lattice. By the comparison of our experimental data with a spatially
resolved, time-dependent dynamic Gutzwiller calculation, we obtain good
quantitative agreement. This allows for a clear identification of the amplitude
mode, showing that it can be detected with full momentum resolution by going
beyond the linear response regime. A systematic shift of the sound and
amplitude modes' resonance frequencies due to the finite Bragg beam intensity
is observed.
\\ ( http://arxiv.org/abs/1010.2205 , 758kb)
Date: Mon, 11 Oct 2010 22:26:30 GMT (3029kb)

Title: Solitons in nonlinear lattices
Authors: Yaroslav V. Kartashov, Boris A. Malomed, Lluis Torner
Categories: physics.optics
Comments: 169 pages, 35 figures, a comprehensive survey of results on solitons
   in purely nonlinear and mixed lattices, to appear in Reviews of Modern
   This article offers a comprehensive survey of results obtained for solitons
and complex nonlinear wave patterns supported by purely nonlinear lattices
(NLs), which represent a spatially periodic modulation of the local strength
and sign of the nonlinearity, and their combinations with linear lattices. A
majority of the results obtained, thus far, in this field and reviewed in this
article are theoretical. Nevertheless, relevant experimental settings are
surveyed too, with emphasis on perspectives for implementation of the
theoretical predictions in the experiment. Physical systems discussed in the
review belong to the realms of nonlinear optics (including artificial optical
media, such as photonic crystals, and plasmonics) and Bose-Einstein
condensation (BEC). The solitons are considered in one, two, and three
dimensions (1D, 2D, and 3D). Basic properties of the solitons presented in the
review are their existence, stability, and mobility. Although the field is
still far from completion, general conclusions can be drawn. In particular, a
novel fundamental property of 1D solitons, which does not occur in the absence
of NLs, is a finite threshold value of the soliton norm, necessary for their
existence. In multidimensional settings, the stability of solitons supported by
the spatial modulation of the nonlinearity is a truly challenging problem, for
the theoretical and experimental studies alike. In both the 1D and 2D cases,
the mechanism which creates solitons in NLs is principally different from its
counterpart in linear lattices, as the solitons are created directly, rather
than bifurcating from Bloch modes of linear lattices.
\\ ( http://arxiv.org/abs/1010.2254 , 3029kb)
Date: Tue, 12 Oct 2010 00:20:39 GMT (592kb)

Title: Exact asymptotes of static and dynamic correlation functions of the 1D
   Bose gas
Authors: Aditya Shashi, Leonid I. Glazman, Jean-Sebastien Caux and Adilet
Categories: cond-mat.stat-mech
Comments: 45 pages (including supplementary material), 4 figures and 1 table
   We consider correlation functions of the integrable Lieb-Liniger 1D Bose gas.
By combining field theoretical approaches with finite size scaling of the exact
form factors, we analytically obtain the "non-universal" prefactors of the
long-distance behavior of correlation functions. We also evaluate prefactors of
singularities in dynamic response functions such as the density structure
factor and spectral function, and prove the existence of singularities within a
continuum spectrum.
\\ ( http://arxiv.org/abs/1010.2268 , 592kb)
Date: Tue, 12 Oct 2010 15:19:39 GMT (23kb)

Title: Observation of St\"{u}ckelberg oscillations in accelerated optical
Authors: A. Zenesini and D. Ciampini and O. Morsch and E. Arimondo
Categories: cond-mat.quant-gas
Comments: 4 pages, 4 figures
   We report the experimental observation of St\"{u}ckelberg oscillations of
matter waves in optical lattices. Extending previous work on Landau-Zener
tunneling of Bose-Einstein condensates in optical lattices, we study the
effects of the accumulated phase between two successive crossings of the
Brillouin zone edge. Our results agree well with a simple model for multiple
Landau-Zener tunneling events taking into account the band structure of the
optical lattice.
\\ ( http://arxiv.org/abs/1010.2413 , 23kb)
arXiv:1010.2415 (*cross-listing*)
Date: Tue, 12 Oct 2010 15:23:11 GMT (87kb)

Title: Seniority in quantum many-body systems
Authors: P. Van Isacker (GANIL)
Categories: nucl-th cond-mat.quant-gas physics.atom-ph
Comments: 16 pages, 1 figure, accepted for publication in the Proceedings of
   The American Institute of Physics
Report-no: GANIL P 2010-015
   The use of the seniority quantum number in many-body systems is reviewed. A
brief summary is given of its introduction by Racah in the context of atomic
spectroscopy. Several extensions of Racah's original idea are discussed:
seniority for identical nucleons in a single-$j$ shell, its extension to the
case of many, non-degenerate $j$ shells and to systems with neutrons and
protons. To illustrate its usefulness to this day, a recent application of
seniority is presented in Bose--Einstein condensates of atoms with spin.
\\ ( http://arxiv.org/abs/1010.2415 , 87kb)
arXiv:1010.2504 (*cross-listing*)
Date: Tue, 12 Oct 2010 20:12:53 GMT (9kb)

Title: Soliton-like Solutions for Nonlinear Schroedinger Equation with variable
   quadratic Hamiltonians
Authors: Erwin Suazo and Sergei K. Suslov
Categories: math-ph math.MP quant-ph
Comments: 6 pages, no figures
   We construct soliton-like solutions for the nonlinear Schroedinger equation
with variable quadratic Hamiltonians
\\ ( http://arxiv.org/abs/1010.2504 , 9kb)
Date: Tue, 12 Oct 2010 20:45:38 GMT (424kb)

Title: Quantum walks and quantum simulations with Bloch oscillating spinor
Authors: D. Witthaut
Categories: quant-ph cond-mat.quant-gas
Comments: published version, 7 figures
Journal-ref: Phys. Rev. A 82, 033602 (2010)
DOI: 10.1103/PhysRevA.82.033602
   We propose a scheme for the realization of a quantum walker and a quantum
simulator for the Dirac equation with ultracold spinor atoms in driven optical
lattices. A precise control of the dynamics of the atomic matter wave can be
realized using time-dependent external forces. If the force depends on the spin
state of the atoms, the dynamics will entangle the inner and outer degrees of
freedom which offers unique opportunities for quantum information and quantum
simulation. Here, we introduce a method to realize a quantum walker based on
the state-dependent transport of spinor atoms and a coherent driving of the
internal state. In the limit of weak driving the dynamics is equivalent to that
of a Dirac particle in 1+1 dimensions. Thus it becomes possible to simulate
relativistic effects such as Zitterbewegung and Klein tunneling.
\\ ( http://arxiv.org/abs/1010.2514 , 424kb)
Date: Wed, 13 Oct 2010 03:58:03 GMT (40kb)

Title: Sympathetic cooling of polyatomic molecules with S-state atoms in a
   magnetic trap
Authors: T. V. Tscherbul, H-G. Yu, A. Dalgarno
Categories: physics.atom-ph physics.chem-ph
Comments: 5 pages, 3 figures, 1 table
   We present a rigorous theoretical study of low-temperature collisions of
polyatomic molecular radicals with ^1S_0 atoms in the presence of an external
magnetic field. Accurate quantum scattering calculations based on ab initio
interaction potentials show that collision-induced spin relaxation of the
prototypical organic molecule CH_2(X^3B_1) (methylene) and 12 other triatomic
radicals in cold 3He gas occurs at a slow rate, demonstrating that cryogenic
buffer-gas cooling and magnetic trapping of these molecules is feasible with
current technology. Our calculations further suggest that it may be possible to
create ultracold gases of polyatomic molecules by sympathetic cooling with
alkaline-earth atoms in a magnetic trap.
\\ ( http://arxiv.org/abs/1010.2567 , 40kb)
Date: Wed, 13 Oct 2010 15:59:16 GMT (30kb)

Title: Mean-field theory for the Mott insulator-paired superfluid transition in
   the two-species Bose-Hubbard model
Authors: M. Iskin
Categories: cond-mat.quant-gas
Comments: 3 pages with 2 figures
   The standard mean-field theory for the Mott insulator-superfluid phase
transition is not sufficient to describe the Mott insulator-paired superfluid
phase transition. Therefore, by restricting the two-species Bose-Hubbard
Hamiltonian to the subspace of paired particles, and using perturbation theory,
here we derive an analytic mean-field expression for the Mott insulator-paired
superfluid transition boundary.
\\ ( http://arxiv.org/abs/1010.2688 , 30kb)
arXiv:1010.2813 (*cross-listing*)
Date: Thu, 14 Oct 2010 03:22:28 GMT (744kb,D)

Title: Engineering Biphoton Wave Packets with an Electromagnetically Induced
Authors: Jianming Wen, Yanhua Zhai, Shengwang Du, and Min Xiao
Categories: quant-ph physics.optics
Comments: Published in Physical Review A 82, 043814 (2010)
DOI: 10.1103/PhysRevA.82.043814
   We propose to shape biphoton wave packets with an electromagnetically induced
grating in a four-level double-$\Lambda$ cold atomic system. We show that the
induced hybrid grating plays an essential role in directing the new fields into
different angular positions, especially to the zeroth-order diffraction. A
number of interesting features appear in the shaped two-photon waveforms. For
example, broadening or narrowing the spectrum would be possible in the proposed
scheme even without the use of a cavity.
\\ ( http://arxiv.org/abs/1010.2813 , 744kb)
Date: Thu, 14 Oct 2010 08:24:53 GMT (24kb)

Title: Tuning the non-linearity of a low-dimensional Bose-Einstein condensate
   exploiting the self-similar transverse dynamics
Authors: A. del Campo
Categories: cond-mat.quant-gas
Comments: 5 pages, 2 figures
   A method is proposed to tune the amplitude of the non-linearity of a
low-dimensional Bose-Einstein condensate by means of engineering the
time-dependence of the transverse confining potential in a highly anisotropic
trap. The method exploits the existence of integrals of motion leading to a
dynamical self-similar scaling law in the radial degrees of freedom. We discuss
the application of the method to preserve short-range correlations in time of
flight experiments, the implementation of nearly-sudden quenches and its power
to assist self-similar dynamics in quasi-one dimensional condensates.
\\ ( http://arxiv.org/abs/1010.2854 , 24kb)
Date: Thu, 14 Oct 2010 09:35:33 GMT (118kb,D)

Title: Quasi-Nambu-Goldstone Modes in Bose-Einstein Condensates
Authors: Shun Uchino, Michikazu Kobayashi, Muneto Nitta, Masahito Ueda
Categories: cond-mat.quant-gas hep-th nucl-th
Comments: 4 pages, 2 figures
   We show that quasi-Nambu-Goldstone (QNG) modes, which play prominent roles in
high energy physics but have been elusive experimentally, can be realized with
atomic Bose-Einstein condensates. The QNG modes emerge when the symmetry of a
ground state is larger than that of the Hamiltonian. When they appear, the
conventional order parameter manifold (OPM) should be enlarged. Consequently
topological defects that are stable within the conventional OPM become unstable
and decay by emitting the QNG modes. Contrary to conventional wisdom, however,
we show that the topological defects are stabilized by quantum fluctuations
that make the QNG modes massive, thereby suppressing their emission.
\\ ( http://arxiv.org/abs/1010.2864 , 118kb)
Date: Thu, 14 Oct 2010 12:40:55 GMT (586kb)

Title: Functional renormalization for the BCS-BEC crossover
Authors: Michael M. Scherer, Stefan Floerchinger, Holger Gies
Categories: cond-mat.quant-gas
Comments: 18 pages, 6 figures, 2 tables, invited review for a Theme Issue of
   the Phil. Trans. A on new developments of the functional RG
   We review the functional renormalization group (RG) approach to the BCS-BEC
crossover for an ultracold gas of fermionic atoms. Formulated in terms of a
scale-dependent effective action, the functional RG interpolates continuously
between the atomic or molecular microphysics and the macroscopic physics on
large length scales. We concentrate on the discussion of the phase diagram as a
function of the scattering length and the temperature which is a paradigm
example for the non-perturbative power of the functional RG. A systematic
derivative expansion provides for both a description of the many-body physics
and its expected universal features as well as an accurate account of the
few-body physics and the associated BEC and BCS limits.
\\ ( http://arxiv.org/abs/1010.2890 , 586kb)
arXiv:1010.2965 (*cross-listing*)
Date: Thu, 14 Oct 2010 16:16:12 GMT (7kb)

Title: Gravity-analogy in one-dimensional ideal Fermi fluids and Burgers'
Authors: Stefano Giovanazzi
Categories: cond-mat.other quant-ph
Comments: 4 pages
   An hydrodynamic description of a one-dimensional flow of an ideal Fermi fluid
is constructed from a semiclassical approximation. For an initially fully
degenerate fluid, Euler and continuity hydrodynamic equations are dual to two
uncoupled inviscid Burgers' equations. Yet the price for the initial simplicity
of the description is paid by the complexity of non-linear instabilities
towards possible turbulent evolutions. Nevertheless, it is shown that linear
long-wavelength density perturbations on a stationary flow are generically
stable. Consequently, linear sound obeys a wave equation with analogy to
gravity. The results have applications for ultra-cold atomic gases.
\\ ( http://arxiv.org/abs/1010.2965 , 7kb)

The replacements:

replaced with revised version Fri, 8 Oct 2010 11:29:01 GMT (743kb)

Title: Quantitative study of two- and three-dimensional strong localization of
   matter waves by atomic scatterers
Authors: Mauro Antezza (LKB - Lhomond), Yvan Castin (LKB - Lhomond), David
Categories: cond-mat.quant-gas
Journal-ref: Physical Review A 82 (2010) 043602
\\ ( http://arxiv.org/abs/1006.4429 , 743kb)
replaced with revised version Fri, 8 Oct 2010 12:45:11 GMT (48kb)

Title: Strong-coupling expansion for the two-species Bose-Hubbard model
Authors: M. Iskin
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 8 pages, 4 figures, and 2 tables (published version)
Journal-ref: Phys. Rev. A 82, 033630 (2010) [8 pages]
\\ ( http://arxiv.org/abs/1001.0021 , 48kb)
replaced with revised version Fri, 8 Oct 2010 13:26:02 GMT (534kb)

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: 8 pages with 4 figures
\\ ( http://arxiv.org/abs/1004.3111 , 534kb)
replaced with revised version Fri, 8 Oct 2010 17:53:33 GMT (34kb)

Title: Simulating Wess-Zumino Supersymmetry Model in Optical Lattices
Authors: Yue Yu and Kun Yang
Categories: cond-mat.quant-gas hep-th
Comments: 4 pages, 1 figure, published verison in PRL with slight difference
Journal-ref: Phys. Rev. Lett. 105, 150605 (2010)
DOI: 10.1103/PhysRevLett.105.150605
\\ ( http://arxiv.org/abs/1005.1399 , 34kb)
arXiv:1007.4939 (*cross-listing*)
replaced with revised version Fri, 8 Oct 2010 18:52:26 GMT (100kb)

Title: Isotropic Contact Forces in Arbitrary Representation: Heterogeneous
   Few-Body Problems and Low Dimensions
Authors: Ludovic Pricoupenko (LPTMC)
Categories: cond-mat.quant-gas quant-ph
\\ ( http://arxiv.org/abs/1007.4939 , 100kb)
replaced with revised version Sat, 9 Oct 2010 08:58:32 GMT (672kb)

Title: Equilibrium and off-equilibrium trap-size scaling in 1D ultracold
   bosonic gases
Authors: Massimo Campostrini and Ettore Vicari
Categories: cond-mat.quant-gas cond-mat.stat-mech
Comments: 24 pages, 36 figs, few changes, refs added
\\ ( http://arxiv.org/abs/1010.0806 , 672kb)
replaced with revised version Mon, 11 Oct 2010 08:10:28 GMT (51kb)

Title: Non-abelian anyons from degenerate Landau levels of ultracold atoms in
   artificial gauge potentials
Authors: Michele Burrello and Andrea Trombettoni
Categories: cond-mat.quant-gas
Comments: Published version
Journal-ref: Phys. Rev. Lett. 105, 125304 (2010)
\\ ( http://arxiv.org/abs/1006.0453 , 51kb)
replaced with revised version Mon, 11 Oct 2010 09:00:57 GMT (1089kb)

Title: Noise in Bose Josephson junctions: Decoherence and phase relaxation
Authors: G. Ferrini, D. Spehner, A. Minguzzi, F.W.J. Hekking
Categories: quant-ph cond-mat.quant-gas
Comments: Fig 2 added; version accepted for publication
Journal-ref: PRA 82, 033621 (2010)
\\ ( http://arxiv.org/abs/0911.0655 , 1089kb)
arXiv:1003.0649 (*cross-listing*)
replaced with revised version Tue, 12 Oct 2010 07:30:48 GMT (12kb)

Title: Entanglement and sensitivity in precision measurements with states of a
   fluctuating number of particles
Authors: P. Hyllus, L. Pezz\'e and A. Smerzi
Categories: quant-ph cond-mat.quant-gas
Comments: Published version
Journal-ref: Phys. Rev. Lett. 105, 120501 (2010)
\\ ( http://arxiv.org/abs/1003.0649 , 12kb)
replaced with revised version Tue, 12 Oct 2010 10:23:32 GMT (75kb)

Title: Viscosity and scale invariance in the unitary Fermi gas
Authors: Tilman Enss, Rudolf Haussmann, Wilhelm Zwerger
Categories: cond-mat.quant-gas hep-th quant-ph
Comments: 34 pages, 9 figures; final form (contains new derivation of sum
   rule), accepted for publication in Annals of Physics
\\ ( http://arxiv.org/abs/1008.0007 , 75kb)
replaced with revised version Tue, 12 Oct 2010 15:16:40 GMT (706kb)

Title: Superfluid Quenching of the Moment of Inertia in a Strongly Interacting
   Fermi Gas
Authors: S. Riedl, E. R. Sanchez Guajardo, C. Kohstall, J. Hecker Denschlag, R.
Categories: cond-mat.quant-gas
Comments: 9 pages, revised discussion of experimental results, new figure 3
\\ ( http://arxiv.org/abs/0907.3814 , 706kb)
replaced with revised version Tue, 12 Oct 2010 18:00:00 GMT (16kb)

Title: High temperature correlation functions: universality, extraction of pair
   interactions, divergent correlation lengths, and dimensional reductions
Authors: Saurish Chakrabarty and Zohar Nussinov
Categories: cond-mat.stat-mech hep-th physics.data-an
Comments: 8 pages (4 main text + 4 supplementary information)
\\ ( http://arxiv.org/abs/1008.2964 , 16kb)
replaced with revised version Tue, 12 Oct 2010 20:28:53 GMT (53kb)

Title: Bethe-Salpeter equations for the collective-mode spectrum of a
   superfluid Fermi gas in a moving optical lattice
Authors: Zlatko Koinov
Categories: cond-mat.str-el
\\ ( http://arxiv.org/abs/1010.1200 , 53kb)
replaced with revised version Wed, 13 Oct 2010 00:50:59 GMT (260kb)

Title: Virial expansion for a strongly correlated Fermi gas with imbalanced
   spin populations
Authors: Xia-Ji Liu and Hui Hu
Categories: cond-mat.quant-gas
Comments: 7 pages, 5 figures, accepted in Phys. Rev. A
\\ ( http://arxiv.org/abs/1008.1457 , 260kb)
replaced with revised version Wed, 13 Oct 2010 05:49:43 GMT (0kb,I)

Title: Quantum metrology to probe atomic parity violation
Authors: M. Mukherjee
Categories: quant-ph
Comments: This paper has been withdrawn by the author due to major changes made
   in the paper
\\ ( http://arxiv.org/abs/0901.1726 , 0kb)
replaced with revised version Wed, 13 Oct 2010 09:58:22 GMT (2182kb)

Title: Groundstate and Collective Modes of a Spin-Polarized Dipolar
   Bose-Einstein Condensate in a Harmonic Trap
Authors: I. Sapina, T. Dahm and N. Schopohl
Categories: cond-mat.quant-gas cond-mat.other
Comments: Final version, accepted for publication in Physical Review A
\\ ( http://arxiv.org/abs/1006.4734 , 2182kb)
replaced with revised version Wed, 13 Oct 2010 11:41:23 GMT (1335kb)

Title: Vortex core transitions in superfluid 3He in globally anisotropic
Authors: Kazushi Aoyama and Ryusuke Ikeda
Categories: cond-mat.supr-con
Comments: 7 pages, 6 figures Text was changed. Resubmitted version
\\ ( http://arxiv.org/abs/1007.4045 , 1335kb)
replaced with revised version Wed, 13 Oct 2010 20:04:58 GMT (0kb,I)

Title: Coherent Decays of Atoms
Authors: Yakir Aharonov, Jeeva Anandan and Shmuel Nussinov
Categories: quant-ph
Comments: This paper has been withdrawn by the authors. 8 pages
\\ ( http://arxiv.org/abs/quant-ph/0109130 , 0kb)
replaced with revised version Wed, 13 Oct 2010 20:37:14 GMT (636kb)

Title: Projective approach to the entanglement entropy of 1-$d$ fermions
Authors: G. C. Levine and B. A. Friedman
Categories: cond-mat.stat-mech
Comments: 8 pages, 6 figures; fixed typos
\\ ( http://arxiv.org/abs/1010.1268 , 636kb)
replaced with revised version Wed, 13 Oct 2010 20:56:44 GMT (8kb)

Title: On the Bose-Einstein Condensation of Rotons
Authors: Lev A. Melnikovsky
Categories: cond-mat.other cond-mat.quant-gas
Comments: 9 pages, number decay exponet corrected, references added, minor
\\ ( http://arxiv.org/abs/1009.4114 , 8kb)
replaced with revised version Thu, 14 Oct 2010 14:02:34 GMT (1008kb,D)

Title: Anisotropic sub-Doppler laser cooling in dysprosium magneto-optical
Authors: Seo Ho Youn, Mingwu Lu, and Benjamin L. Lev
Categories: physics.atom-ph quant-ph
Comments: 4 pages, 5 figures
Journal-ref: PRA 82, 043403 (2010)
DOI: 10.1103/PhysRevA.82.043403
\\ ( http://arxiv.org/abs/1007.3245 , 1008kb)
replaced with revised version Thu, 14 Oct 2010 14:39:05 GMT (349kb)

Title: Hyperfine, rotational, and vibrational structure of the triplet ground
   state of Rb molecules
Authors: Christoph Strauss, Tetsu Takekoshi, Florian Lang, Klaus Winkler,
   Rudolf Grimm, Johannes Hecker Denschlag, and Eberhard Tiemann
Categories: physics.atom-ph cond-mat.other
\\ ( http://arxiv.org/abs/1009.2075 , 349kb)
replaced with revised version Thu, 14 Oct 2010 15:52:35 GMT (131kb,D)

Title: First and second sound in cylindrically trapped gases
Authors: G. Bertaina, L. Pitaevskii, S. Stringari
Categories: cond-mat.quant-gas physics.flu-dyn
Comments: 4 pages, 2 figures. Published version in Phys. Rev. Lett
Journal-ref: Phys. Rev. Lett. 105, 150402 (2010)
DOI: 10.1103/PhysRevLett.105.150402
\\ ( http://arxiv.org/abs/1002.0195 , 131kb)

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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Received on Thu Nov 11 2010 - 17:36:56 EST

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