# Matt's arXiv selection, Monday 20th February 2006.

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Mon, 20 Feb 2006 08:49:15 +1000 (EST)

The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>

Hello all,

This list has now reached 75 subscribers. Please continue to spread the word:

Look out for Ulf Leonhardt's paper on invisibility devices... not exactly
ultracold gases I know, but it caught my eye!

Cheers,
Matt.

--
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Dr M. J. Davis,               Senior Lecturer in Physics
School of Physical Sciences,  email: mdavis_at_physics.uq.edu.au
University of Queensland,     ph   : +61 7 334 69824
Brisbane, QLD 4072,           fax  : +61 7 336 51242
Australia.                    http://www.physics.uq.edu.au/people/mdavis/
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Paper: cond-mat/0602245
Date: Thu, 9 Feb 2006 21:04:40 GMT   (65kb)
Title: Competing Orders in two-dimensional Bose-Fermi mixtures
Authors: L. Mathey, S-W. Tsai, A.H. Castro Neto
Subj-class: Other
\\
Using a functional renormalization group approach we study the zero
temperature phase diagram of two-dimensional Bose-Fermi mixtures of ultra-cold
atoms in optical lattices, in the limit when the velocity of bosonic
fluctuations are much larger than the Fermi velocity.
For spin-1/2 fermions we obtain a phase diagram, which shows a competition of
pairing phases of various orbital symmetry ($s$, $p$, and $d$) and
antiferromagnetic order. We determine the value of the gaps of various phases
close to half-filling, and identify subdominant orders as well as short-range
fluctuations from the RG flow. For spinless fermions we find that p-wave
pairing dominates the phase diagram.
\\ ( http://arXiv.org/abs/cond-mat/0602245 ,  65kb)
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Paper: cond-mat/0602274
Date: Fri, 10 Feb 2006 19:02:13 GMT   (25kb)
Title: Induced P-wave Superfluidity in Asymmetric Fermi Gases
Authors: Aurel Bulgac, Michael McNeil Forbes, Achim Schwenk
Subj-class: Other; Superconductivity
\\
We show that two new intra-species P-wave superfluid phases appear in
two-component asymmetric Fermi systems with short-range S-wave interactions. In
the BEC limit, phonons of the molecular BEC induce P-wave superfluidity in the
excess fermions. In the BCS limit, density fluctuations induce P-wave
superfluidity in both the majority and the minority species. These phases may
be realized in experiments with spin-polarized Fermi gases.
\\ ( http://arXiv.org/abs/cond-mat/0602274 ,  25kb)
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Paper: cond-mat/0511547
replaced with revised version Fri, 10 Feb 2006 14:59:03 GMT   (201kb)
Title: Low lying twisting and acoustic modes of a rotating Bose-Einstein
condensate
Authors: Fr\'{e}d\'{e}ric Chevy (LKB - Lhomond)
Proxy: ccsd ccsd-00014252
Subj-class: Mesoscopic Systems and Quantum Hall Effect
\\ ( http://arXiv.org/abs/cond-mat/0511547 ,  201kb)
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Paper: quant-ph/0602090
Date: Fri, 10 Feb 2006 09:42:28 GMT   (253kb)
Title: Dynamical generation of spin-spin entanglement via spin-independent
scattering of two identical s=1/2 fermions
Authors: Lucas Lamata and Juan Leon
Comments: 4 pages and 3 figures. Submitted for publication
\\
We consider the spin-spin entanglement between two identical fermions
generated in spin-independent scattering. The spatial degrees of freedom act as
ancillas for the creation of entanglement to a degree that depends on the
scattering angle, $\theta$. The number of Slater determinants generated in the
process is greater than 1, corresponding to genuine quantum correlations
between the identical fermions. The maximal entanglement attainable of 1 e-bit
is reached at $\theta=\pi/2$. We also analyze a simple $\theta$ dependent
Bell's inequality, which is violated for $\pi/4<\theta\leq\pi/2$. This
phenomenon is unrelated to the symmetrization postulate but does not appear for
unequal particles.
\\ ( http://arXiv.org/abs/quant-ph/0602090 ,  253kb)
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Paper: physics/0602075
Date: Fri, 10 Feb 2006 16:54:04 GMT   (275kb)
Title: Self-driven nonlinear dynamics in magneto-optical traps
Authors: T. Pohl, G. Labeyrie and R. Kaiser
Subj-class: Atomic Physics
\\
We present a theoretical model describing recently observed collective
effects in large magneto-optically trapped atomic ensembles. Based on a kinetic
description we develop an efficient test particle method, which in addition to
the single atom light pressure accounts for other relevant effects such as
laser attenuation and forces due to multiply scattered light with position
dependent absorption cross sections. Our calculations confirm the existence of
a dynamical instability and provide deeper insights into the observed system
dynamics.
\\ ( http://arXiv.org/abs/physics/0602075 ,  275kb)
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Paper: cond-mat/0602278
Date: Sun, 12 Feb 2006 22:26:27 GMT   (169kb)
Title: Vortex-Peierls States in Optical Lattices
Authors: A.A. Burkov, Eugene Demler
Subj-class: Strongly Correlated Electrons; Superconductivity
\\
We show that vortices, induced in cold atom superfluids in optical lattices,
may order in a novel vortex-Peierls ground state. In such a state vortices do
not form a simple lattice but arrange themselves in clusters, within which the
vortices are partially delocalized, tunneling between classically degenerate
configurations. We demonstrate that this exotic quantum many-body state is
selected by an order-from-disorder mechanism for a special combination of the
vortex filling and lattice geometry that has a macroscopic number of
classically degenerate ground states.
\\ ( http://arXiv.org/abs/cond-mat/0602278 ,  169kb)
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Paper: cond-mat/0602283
Date: Sat, 11 Feb 2006 00:58:41 GMT   (118kb)
Title: Time of flight observables and the formation of Mott domains of fermions
and bosons on optical lattices
Authors: M. Rigol, R. T. Scalettar, P. Sengupta, and G. G. Batrouni
Comments: 4 pages, 6 figures, to appear in PRB(R)
Subj-class: Strongly Correlated Electrons; Superconductivity
\\
We study, using quantum Monte-Carlo simulations, the energetics of the
formation of Mott domains of fermions and bosons trapped on one-dimensional
lattices. We show that, in both cases, the sum of kinetic and interaction
energies exhibits minima when Mott domains appear in the trap. In addition, we
examine the derivatives of the kinetic and interaction energies, and of their
sum, which display clear signatures of the Mott transition. We discuss the
relevance of these findings to time of flight experiments that could allow the
detection of the metal--Mott-insulator transition in confined fermions on
optical lattices, and support established results on the
superfluid--Mott-insulator transition in confined bosons on optical lattices.
\\ ( http://arXiv.org/abs/cond-mat/0602283 ,  118kb)
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Paper: cond-mat/0602299
Date: Mon, 13 Feb 2006 10:10:34 GMT   (167kb)
Title: Entanglement production with multimode Bose-Einstein condensates in
optical lattices
Authors: V.I. Yukalov and E.P. Yukalova
Comments: Latex file, 16 pages, 7 figures
Subj-class: Mesoscopic Systems and Quantum Hall Effect; Statistical Mechanics
Journal-ref: Laser Phys. 16 (2006) 354-359
\\
Deep optical lattices are considered, in each site of which there are many
Bose-condensed atoms. By the resonant modulation of trapping potentials it is
possible to transfer a macroscopic portion of atoms to the collective nonlinear
states corresponding to topological coherent modes. Entanglement can be
generated between these modes. By varying the resonant modulating field it is
possible to effectively regulate entanglement production in this multimode
multitrap system of Bose condensates.
\\ ( http://arXiv.org/abs/cond-mat/0602299 ,  167kb)
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Paper: cond-mat/0511036
replaced with revised version Sat, 11 Feb 2006 21:43:00 GMT   (27kb)
Title: Coupled-channel pseudo-potential description of the Feshbach resonance
in two dimensions
Authors: K. Kanjilal and D. Blume
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0511036 ,  27kb)
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Paper: cond-mat/0511746
replaced with revised version Sun, 12 Feb 2006 11:16:47 GMT   (352kb)
Title: Strongly correlated Fermi-Bose mixtures in disordered optical lattices
Authors: L. Sanchez-Palencia (LCFIO), V. Ahufinger, A. Kantian, Jakub
Zakrzewski, A. Sanpera, M. Lewenstein
Comments: Proceedings of the 3rd International Workshop on Theory of Quantum
Gases and Quantum Coherence'
Proxy: ccsd ccsd-00014953
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0511746 ,  352kb)
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Paper: quant-ph/0505074
replaced with revised version Mon, 13 Feb 2006 07:28:22 GMT   (9kb)
Title: Ultimate decoherence border for matter-wave interferometry
Authors: Brahim Lamine (LKB - Jussieu), R\'{e}my Herv\'{e} (LKB - Jussieu),
Astrid Lambrecht (LKB - Jussieu), Serge Reynaud (LKB - Jussieu)
Proxy: ccsd ccsd-00004899
Journal-ref: Physical Review Letters 96 (2006) 050405
DOI: 10.1103/PhysRevLett.96.050405
\\ ( http://arXiv.org/abs/quant-ph/0505074 ,  9kb)
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Paper: cond-mat/0602319
Date: Mon, 13 Feb 2006 22:45:37 GMT   (99kb)
Title: Searching for a Supersolid in Cold Atom Optical Lattices and More
Authors: V.W. Scarola, E. Demler, and S. Das Sarma
Subj-class: Other
\\
We suggest a technique for the observation of a predicted supersolid phase in
extended Bose-Hubbard models which are potentially realizable in cold atom
optical lattice systems. In particular, we discuss important subtleties arising
from the existence of the trapping potential which leads to an externally
imposed (as opposed to spontaneous) breaking of translational invariance. We
show, by carefully including the trapping potential in our theoretical
formalism, that noise correlations could prove instrumental in identifying the
supersolid and density wave phases. We also find that the noise correlation
peak shape allows for a determination of the relative size of trapped Mott
domains.
\\ ( http://arXiv.org/abs/cond-mat/0602319 ,  99kb)
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Paper: cond-mat/0602334
Date: Tue, 14 Feb 2006 13:52:07 GMT   (102kb)
Title: Hysteresis effects in rotating Bose-Einstein condensates
Authors: B. Jackson and C. F. Barenghi
Subj-class: Statistical Mechanics
\\
We consider the formation of vortices in a dilute Bose-Einstein condensate
confined in a rotating anisotropic trap. We find that the number of vortices
and angular momentum attained by the condensate depends upon the rotation
history of the trap and on the number of vortices present in the condensate
initially. We discuss this effect in terms of the resonant frequency of the
quadrupole mode, which shifts according to the rotation velocity of the
condensate. Differences between the spin-up and spin-down response of the
condensate are found, demonstrating hysteresis phenomena in this system.
\\ ( http://arXiv.org/abs/cond-mat/0602334 ,  102kb)
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Paper: quant-ph/0511070
Date: Tue, 8 Nov 2005 06:11:50 GMT   (60kb)
Date (revised v2): Sun, 12 Feb 2006 20:25:16 GMT   (202kb)
Title: Classical simulation of quantum many-body systems with a tree tensor
network
Authors: Yaoyun Shi and Luming Duan and Guifre Vidal
Subj-class: Quantum Physics; Strongly Correlated Electrons
\\
We show how to efficiently simulate a quantum many-body system with tree
structure when its entanglement is bounded for any bipartite split along an
edge of the tree. This is achieved by expanding the {\em time-evolving block
decimation} simulation algorithm for time evolution from a one dimensional
lattice to a tree graph, while replacing a {\em matrix product state} with a
{\em tree tensor network}. As an application, we show that any one-way quantum
computation on a tree graph can be efficiently simulated with a classical
computer.
\\ ( http://arXiv.org/abs/quant-ph/0511070 ,  202kb)
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Paper: cond-mat/0503264
replaced with revised version Tue, 14 Feb 2006 05:25:07 GMT   (69kb)
Title: Finite Temperature Excitations of an anisotropically trapped Bose gas :
A diffusion Monte Carlo study
Authors: S. Datta
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0503264 ,  69kb)
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Paper: cond-mat/0503511
replaced with revised version Tue, 14 Feb 2006 12:58:46 GMT   (36kb)
Title: Dynamics of a Quantum Phase Transition
Authors: Wojciech H. Zurek, Uwe Dorner, Peter Zoller
Comments: 4 pages, 3 figures. Replaced by revised version
Subj-class: Statistical Mechanics
Journal-ref: Phys. Rev. Lett. 95, 105701 (2005)
DOI: 10.1103/PhysRevLett.95.105701
\\ ( http://arXiv.org/abs/cond-mat/0503511 ,  36kb)
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Paper: cond-mat/0508430
replaced with revised version Tue, 14 Feb 2006 20:56:58 GMT   (62kb)
Title: BEC-BCS crossover in "magnetized" Feshbach-resonantly paired superfluids
Comments: 4 RevTeX pages, 2 figures. Minor changes from previous version
Subj-class: Superconductivity; Statistical Mechanics
Journal-ref: PRL 96, 060401 (2006)
\\ ( http://arXiv.org/abs/cond-mat/0508430 ,  62kb)
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Paper: cond-mat/0602055
replaced with revised version Tue, 14 Feb 2006 05:03:25 GMT   (28kb)
Title: Bose Einstein Condensation of incommensurate solid 4He
Authors: D. E. Galli and L. Reatto
Subj-class: Other; Statistical Mechanics
\\ ( http://arXiv.org/abs/cond-mat/0602055 ,  28kb)
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Paper: cond-mat/0602305
Date: Mon, 13 Feb 2006 16:52:42 GMT   (20kb)
Title: Numerical methods for time evolution of Matrix Product States
Authors: Juan Jose Garcia-Ripoll
Subj-class: Strongly Correlated Electrons
\\
In this work we develop several new simulation algorithms for 1D many-body
quantum mechanical systems combining the Matrix Product State variational
ansatz with Taylor, Pade and Arnoldi approximations to the evolution operator.
By comparing all methods with previous techniques based on Trotter
decompositions we demonstrate that the Arnoldi method is the best one, reaching
extremely good accuracy with moderate resources. Finally we apply this
algorithm to studying the formation of molecules in an optical lattices when
crossing a Feschbach resonance with a cloud of two-species hard-core bosons.
\\ ( http://arXiv.org/abs/cond-mat/0602305 ,  20kb)
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Paper: physics/0602092
Date: Tue, 14 Feb 2006 10:34:07 GMT   (333kb)
Title: Optical Conformal Mapping and Dielectric Invisibility Devices
Authors: Ulf Leonhardt
accepted by peer review
Subj-class: Optics
\\
An invisibility device should guide light around an object as if nothing were
there, regardless where the light comes from. Ideal invisibility devices are
impossible due to the wave nature of light. This paper develops a general
recipe for the design of media that create perfect invisibility within the
accuracy of geometrical optics. Here the imperfections of invisibility can be
made arbitrarily small to hide objects that are much larger than the
wavelength. Using modern metamaterials, practical demonstrations of such
devices seem possible. The method developed here can be also applied to escape
from detection by other forms of waves such as sound.
\\ ( http://arXiv.org/abs/physics/0602092 ,  333kb)
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Paper: physics/0510268
replaced with revised version Tue, 14 Feb 2006 20:15:46 GMT   (100kb)
Title: Predictions of laser-cooling temperatures for multilevel atoms in
Authors: Josh W. Dunn and Chris H. Greene
Comments: 21 pages, 4 figures, LaTeX; minor revisions, shortened appendix
Subj-class: Atomic Physics
\\ ( http://arXiv.org/abs/physics/0510268 ,  100kb)
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Paper: cond-mat/0602343
Date: Tue, 14 Feb 2006 22:56:04 GMT   (153kb)
Title: Theory of Raman superradiance imaging of condensed Bose gases
Authors: H. Uys and P. Meystre
Subj-class: Other
\\
We investigate the off-resonant superradiant Raman scattering of light from a
cigar-shaped atomic Bose-Einstein condensate. Superradiant emission has been
proposed as applied to the imaging of quantum-degenerate atomic system, as it
yields a stronger image contrast than conventional incoherent scattering. Our
multimode theory is in good agreement with the time-dependent spatial features
observed in superradiant absorption imaging, and the inclusion of quantum
fluctuations in the initial stages of the superradiant emission account well
for shot-to-shot fluctuations observed in experiments.
\\ ( http://arXiv.org/abs/cond-mat/0602343 ,  153kb)
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Paper: cond-mat/0602346
Date: Wed, 15 Feb 2006 08:31:52 GMT   (729kb)
Title: Measurement of Phase Coherence during the Growth of an Elongated
Condensate
Authors: Mathilde Hugbart (LCFIO), Jocelyn A. Retter (LCFIO), Andres Var\{o}n
(LCFIO), Philippe Bouyer (LCFIO), Alain Aspect (LCFIO)
Proxy: ccsd ccsd-00018350
Subj-class: Other
\\
We study the growth of an elongated condensate from a non-equilibrium thermal
cloud obtained by shock-cooling. Quantitative measurements using momentum Bragg
spectroscopy reveal the evolution of the phase coherence length as the
condensate grows to equilibrium. A broadening of the momentum distribution
compared to that expected at equilibrium is observed at early times. This
\\ ( http://arXiv.org/abs/cond-mat/0602346 ,  729kb)
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Paper: quant-ph/0602118
Date: Tue, 14 Feb 2006 23:54:28 GMT   (98kb)
Title: Highly nonclassical photon statistics in parametric down conversion
Authors: Edo Waks, Barry Sanders, Eleni Diamanti, and Yoshihisa Yamamoto
\\
We use photon counters to obtain the joint photon counting statistics from
twin-beam non-degenerate parametric down conversion, and we demonstrate
directly, and with no auxiliary assumptions, that these twin beams are
nonclassical.
\\ ( http://arXiv.org/abs/quant-ph/0602118 ,  98kb)
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Paper: cond-mat/0602319
Date: Mon, 13 Feb 2006 22:45:37 GMT   (99kb)
Title: Searching for a Supersolid in Cold Atom Optical Lattices and More
Authors: V.W. Scarola, E. Demler, and S. Das Sarma
Subj-class: Other
\\
We suggest a technique for the observation of a predicted supersolid phase in
extended Bose-Hubbard models which are potentially realizable in cold atom
optical lattice systems. In particular, we discuss important subtleties arising
from the existence of the trapping potential which leads to an externally
imposed (as opposed to spontaneous) breaking of translational invariance. We
show, by carefully including the trapping potential in our theoretical
formalism, that noise correlations could prove instrumental in identifying the
supersolid and density wave phases. We also find that the noise correlation
peak shape allows for a determination of the relative size of trapped Mott
domains.
\\ ( http://arXiv.org/abs/cond-mat/0602319 ,  99kb)
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Paper: quant-ph/0602131
Date: Wed, 15 Feb 2006 21:15:20 GMT   (304kb)
Title: Slow light in paraffin-coated Rb vapor cells
Authors: M. Klein, I. Novikova, D.F. Phillips, R.L. Walsworth
(Harvard-Smithsonian Center for Astrophysics)
Comments: 6 pages, 6 figures, submitted to Journal of Modern Optics
\\
We present preliminary results from an experimental study of slow light in
anti-relaxation-coated Rb vapor cells, and describe the construction and
testing of such cells. The slow ground state decoherence rate allowed by coated
cell walls leads to a dual-structured electromagnetically induced transparency
(EIT) spectrum with a very narrow (<100 Hz) transparency peak on top of a broad
pedestal. Such dual-structure EIT permits optical probe pulses to propagate
with greatly reduced group velocity on two time scales. We discuss ongoing
efforts to optimize the pulse delay in such coated cell systems.
\\ ( http://arXiv.org/abs/quant-ph/0602131 ,  304kb)
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Paper: quant-ph/0602132
Date: Thu, 16 Feb 2006 00:02:21 GMT   (512kb)
Title: A quantum study of multi-bit phase coding for optical storage
Authors: Magnus T.L. Hsu, Vincent Delaubert, Warwick P. Bowen, Claude Fabre,
Hans-A. Bachor and Ping Koy Lam
Comments: 8 pages, 7 figures (Please email author for a PDF file if the
manuscript does not turn out properly)
\\
We propose a scheme which encodes information in both the longitudinal and
spatial transverse phases of a continuous-wave optical beam. A split
detector-based interferometric scheme is then introduced to optimally detect
both encoded phase signals. In contrast to present-day optical storage devices,
our phase coding scheme has an information storage capacity which scales with
the power of the read-out optical beam. We analyse the maximum number of
encoding possibilities at the shot noise limit. In addition, we show that using
squeezed light, the shot noise limit can be overcome and the number of encoding
possibilities increased. We discuss a possible application of our phase coding
scheme for increasing the capacities of optical storage devices.
\\ ( http://arXiv.org/abs/quant-ph/0602132 ,  512kb)
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Paper: physics/0602108
Date: Wed, 15 Feb 2006 22:08:04 GMT   (516kb)
Title: All-optical generation and photoassociative probing of sodium
Bose-Einstein condensates
Authors: R. Dumke, M. Johanning, E. Gomez, J. D. Weinstein, K. M. Jones and P.
D. Lett
Subj-class: Atomic Physics
\\
We demonsatrate an all optical technique to evaporatively produce sodium
Bose-Einstein condensates (BEC). We use a crossed-dipole trap formed from light
near 1060 nm, and a simple ramp of the intensity to force evaporation. In
process, and show that it can be used to detect the onset of Bose-Einstein
condensation. Finally, we demonstrate the straightforward production of
multiple traps with condensates using this technique, and that some control
over the spinor state of the BEC is achieved by positioning the trap as well.
\\ ( http://arXiv.org/abs/physics/0602108 ,  516kb)
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Paper: physics/0602109
Date: Wed, 15 Feb 2006 22:22:38 GMT   (193kb)
Title: Nonlinear magneto-optical rotation with frequency-modulated light in the
geophysical field range
Authors: V. Acosta, M. P. Ledbetter, S. M. Rochester, D. Budker, D. F.
Jackson-Kimball, D. C. Hovde, W. Gawlik, S. Pustelny, J. Zachorowski
Subj-class: Atomic Physics
\\
Recent work investigating resonant nonlinear magneto-optical rotation (NMOR)
related to long-lived ($\tau\ts{rel} \sim 1~{\rm s}$) ground-state atomic
coherences has demonstrated potential magnetometric sensitivities exceeding
$10^{-11}~{\rm G/\sqrt{Hz}}$ for small ($\lesssim 1~{\rm \mu G}$) magnetic
fields. In the present work, NMOR using frequency-modulated light (FM NMOR) is
studied in the regime where the longitudinal magnetic field is in the
geophysical range ($\sim 500~{\rm mG}$), of particular interest for many
applications. In this regime a splitting of the FM NMOR resonance due to the
nonlinear Zeeman effect is observed. At sufficiently high light intensities,
there is also a splitting of the FM NMOR resonances due to ac Stark shifts
induced by the optical field, as well as evidence of alignment-to-orientation
conversion type processes. The consequences of these effects for FM-NMOR-based
atomic magnetometry in the geophysical field range are considered.
\\ ( http://arXiv.org/abs/physics/0602109 ,  193kb)
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Received on Mon Feb 20 2006 - 08:49:15 EST

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