Matt's arXiv selection: week ending 20 February 2009

From: Matthew Davis <>
Date: Mon, 18 May 2009 22:44:08 +1000

The following message was sent to the matts_arxiv list by Matthew Davis <>

Dear subscribers,

I would like to thank Andy Ferris for collating the initial list of abstracts in
this post. There are 43 new preprints and 14 replacements.

Date: Thu, 12 Feb 2009 21:00:19 GMT (214kb)

Title: Dynamical Mean-Field Analysis of the Multispecies Bose-Hubbard Model
Authors: A. Hubener, M. Snoek, W. Hofstetter
Categories: cond-mat.other
Comments: 4+ pages, 4 figures
   We investigate the Bose-Hubbard model by means of Bosonic Dynamical
Mean-Field Theory (BDMFT). For spinless bosons this yields a phase diagram
where the Mott-lobes are enhanced compared to the mean-field result. Applying
BDMFT to two-component bosonic mixtures such as 87Rb - 41K we find a rich phase
diagram where besides the Z-antiferromagnet, XY-ferromagnet and XY-superfluid
also a supersolid phase is present.
\\ ( , 214kb)
Date: Thu, 12 Feb 2009 22:59:47 GMT (1943kb)

Title: Persistent current of Luttinger liquid in one-dimensional ring with weak
   link: Continuous model studied by configuration interaction and quantum Monte
Authors: R. N\'emeth, M. Mo\v{s}ko, R. Kr\v{c}m\'ar, A. Gendiar, M. Indlekofer
   and L. Mitas
Categories: cond-mat.mes-hall cond-mat.str-el
Comments: 20 pages, 20 figures included
   We study the persistent current of correlated spinless electrons in a
continuous one-dimensional ring with a single weak link. We include
correlations by solving the many-body Schrodinger equation for several tens of
electrons interacting via the short-ranged pair interaction V(x - x'). We solve
this many-body problem by advanced configuration-interaction (CI) and diffusion
Monte Carlo (DMC) methods. Our CI and DMC results show, that the persistent
current (I) as a function of the ring length (L) exhibits for large L the power
law typical of the Luttinger liquid, $I \propto L^{-1-\alpha}$, where the power
$\alpha$ depends only on the electron-electron (e-e) interaction. For strong
e-e interaction the previous theories predicted for $\alpha$ the formula
$\alpha = {(1 + 2 \alpha_{RG})}^{1/2} - 1$, where $\alpha_{RG} =
[V(0)-V(2k_F)]/2\pi \hbar v_F$ is the renormalisation-group result for weakly
interacting electrons, with V(q) being the Fourier transform of V(x-x'). Our
numerical data show that this theoretical result holds in the continuous model
only if the range of V(x - x') is small (roughly $d \lesssim 1/2k_F$, more
precisely $4d^2k_F^2 << 1$). For strong e-e interaction ($\alpha_{RG} > 0.25$)
our CI data show the power law $I \propto L^{-1-\alpha}$ already for rings with
only ten electrons, i.e., ten electrons are already enough to behave like the
Luttinger liquid. The DMC data for $\alpha_{RG} > 0.25$ are damaged by the
so-called fixed-phase approximation. Finally, we also treat the e-e interaction
in the Hartree-Fock approximation. We find the exponentially decaying I(L)
instead of the power law, however, the slope of log(I(L)) still depends solely
on the parameter $\alpha_{RG}$ as long as the range of V(x - x') approaches
\\ ( , 1943kb)
Date: Fri, 13 Feb 2009 09:14:34 GMT (443kb,D)

Title: Angular FFLO State in Cold Fermion Gases in Toroidal Trap
Authors: Youichi Yanase
Categories: cond-mat.other cond-mat.supr-con
   We study the possibility of angular Fulde-Ferrel-Larkin-Ovchinnikov (FFLO)
state, in which the rotation symmetry is spontaneously broken, in population
imbalanced fermion gases near the BCS-BEC crossover. We investigate the
superfluid at low temperatures on the basis of the Bogoliubov-de Gennes
equation, and examine the stability against thermal fluctuations using the
T-matrix approach beyond LDA. We find that the angular FFLO state is stabilized
in the gases confined in the toroidal trap, but not in the harmonic trap. The
angular FFLO state is stable near the BCS-BEC crossover owing to the pseudogap.
Spatial dependences of number density and local population imbalance are shown
for an experimental test.
\\ ( , 443kb)
Date: Fri, 13 Feb 2009 09:23:51 GMT (312kb)

Title: Static and dynamical properties of a two-dimensional Wigner crystal of
   rotating dipolar Fermi gases
Authors: Szu-Cheng Cheng
Categories: cond-mat.other
Comments: 25 pages, 8 figures
   Using an ansatz wave function for the ground state of rotating
two-dimensional dipolar fermions, which occupy only partially the lowest Landau
level, we study the correlation energy and elastic properties of the Wigner
crystal of rotating dipolar Fermi gases. From a simple Hartree-Fock approach,
we show that the correlation energy of a particle crystal is lower and higher
than the correlation energy of a hole crystal for filling factors v<1/2 and
v>1/2, respectively. Furthermore we find that the shear moduli of these dipolar
crystals have a nonmonotonic behavior as a function of the filling factor. We
also examine the stability of a Wigner crystal. The Wigner crystal with the
sample width being zero is locally stable for 0< v <1/2, while the
corresponding hole crystal is locally stable for 1/2< v <1. Due to the WC being
unstable around v=1/2, we also conclude that a new liquid state, not a quantum
Hall state, can exist at v=1/2.
\\ ( , 312kb)
arXiv:0901.1106 (*cross-listing*)
Date: Thu, 8 Jan 2009 18:44:45 GMT (13kb)
Date (revised v2): Mon, 19 Jan 2009 17:04:50 GMT (13kb)

Title: Bose-Einstein Condensation of Dark Matter Axions
Authors: P. Sikivie and Q. Yang
Categories: hep-ph astro-ph.CO cond-mat.stat-mech
Comments: 5 pages, 1 figure. An error is corrected, and several references
   added. The conclusions are unchanged
Report-no: UFIFT-HEP-09-1
   We show that cold dark matter axions thermalize and form a Bose-Einstein
condensate. We obtain the axion state in a homogeneous and isotropic universe,
and derive the equations governing small axion perturbations. Because they form
a BEC, axions differ from ordinary cold dark matter. A repulsive force
suppresses the formation of caustics and hence of small scale structure.
Bose-Einstein condensation of dark matter axions provides a mechanism for the
production of net overall rotation in dark matter halos, and for the alignment
of cosmic microwave anisotropy multipoles.
\\ ( , 13kb)
Date: Fri, 13 Feb 2009 01:08:49 GMT (520kb)

Title: Entanglement Transfer from Bosonic Systems to Qubits
Authors: Andrzej Veitia
Categories: quant-ph
   We study the entanglement of a pair of qubits resulting from their
interaction with a bosonic system. Here we restrict our discussion to the case
where the set of operators acting on different qubits commute. A special class
of interactions inducing entanglement in an initially separable two qubit
system is discussed. Our results apply to the case where the initial state of
the bosonic system is represented by a statistical mixture of states with fixed
particle number.
\\ ( , 520kb)
Date: Fri, 13 Feb 2009 12:13:59 GMT (546kb)

Title: Monitoring the wave function by time continuous position measurement
Authors: Thomas Konrad, Andreas Rothe, Francesco Petruccione and Lajos Di\'osi
Categories: quant-ph
Comments: 14 pages, 5 figures. For associated avi file (movie) see
   We consider a single copy of a quantum particle moving in a potential and
show that it is possible to monitor its complete wave function by only
continuously measuring its position. While we assume that the potential is
known, no information is available about its state initially. In order to
monitor the wave function, an estimate of the wave function is propagated due
to the influence of the potential and continuously updated according to the
results of the position measurement. We demonstrate by numerical simulations
that the estimation reaches arbitrary values of accuracy below 100 percent
within a finite time period for the potentials we study. In this way our method
grants, a certain time after the beginning of the measurement, an accurate
real-time record of the state evolution including the influence of the
continuous measurement. Moreover, it is robust against sudden perturbations of
the system as for example random momentum kicks from environmental particles,
provided they occur not too frequently.
\\ ( , 546kb)
Date: Fri, 13 Feb 2009 03:20:46 GMT (489kb)

Title: Single photon quantum non-demolition in the presence of inhomogeneous
Authors: Andrew D. Greentree, R. G. Beausoleil, L. C. L. Hollenberg, W. J.
   Munro, Kae Nemoto, S. Prawer, and T. P. Spiller
Categories: quant-ph
Comments: 21 pages, 9 figures (some in colour) at low resolution for arXiv
   Electromagnetically induced transparency (EIT) has been often proposed for
generating nonlinear optical effects at the single photon level; in particular,
as a means to effect a quantum non-demolition measurement of a single photon
field. Previous treatments have usually considered homogeneously broadened
samples, but realisations in any medium will have to contend with inhomogeneous
broadening. Here we reappraise an earlier scheme [Munro \textit{et al.} Phys.
Rev. A \textbf{71}, 033819 (2005)] with respect to inhomogeneities and show an
alternative mode of operation that is preferred in an inhomogeneous
environment. We further show the implications of these results on a potential
implementation in diamond containing nitrogen-vacancy colour centres. Our
modelling shows that single mode waveguide structures of length $200
\mu\mathrm{m}$ in single-crystal diamond containing a dilute ensemble of NV$^-$
of only 200 centres are sufficient for quantum non-demolition measurements
using EIT-based weak nonlinear interactions.
\\ ( , 489kb)
Date: Thu, 12 Feb 2009 22:55:02 GMT (228kb,D)

Title: Measurement of inelastic losses in a sample of ultracold Rb-85
Authors: P. A. Altin, N. P. Robins, J. E. Debs, D. D\"oring, C. Figl and J. D.
Categories: physics.atom-ph
Comments: 4 pages, 3 figures
   We describe a setup used to create ultracold Rb-85 clouds by sympathetic
cooling with a Rb-87 reservoir. The machine produces pure Rb-87 condensates of
10^6 atoms in a tightly-confining quadrupole-Ioffe (QUIC) magnetic trap. By
combining Rb-85 and Rb-87 atoms collected in a dual-species magneto-optical
trap and selectively evaporating the heavier isotope, we demonstrate strong
sympathetic cooling of the Rb-85 cloud, increasing its phase space density by
three orders of magnitude with no detectable loss in number. We have used
ultracold samples created in this way to observe the variation of inelastic
losses in Rb-85 as a function of magnetic field near the 155 G Feshbach
resonance, including a previously unobserved feature associated with a
predicted Feshbach resonance near 215 G. With further evaporation in an optical
dipole trap, temperatures below 100 nK and phase space densities of 0.2 have
been achieved.
\\ ( , 228kb)
Date: Fri, 13 Feb 2009 21:35:45 GMT (75kb)

Title: Energy Transport in a One-Dimensional Granular Gas
Authors: Italo Ivo Lima Dias Pinto, Alexandre Rosas, Katja Lindenberg
Categories: cond-mat.stat-mech cond-mat.soft
   We study heat conduction in one-dimensional granular gases. In particular, we
consider two mechanisms of viscous dissipation during inter-grain collisions.
In one, the dissipative force is proportional to the grain's velocity and
dissipates not only energy but also momentum. In the other, the dissipative
force is proportional to the relative velocity of the grains and therefore
conserves momentum even while dissipating energy. This allows us to explore the
role of momentum conservation in the heat conduction properties of this
one-dimensional nonlinear system. We find normal thermal conduction whether or
not momentum is conserved.
\\ ( , 75kb)
Date: Sat, 14 Feb 2009 12:14:32 GMT (118kb)

Title: Casimir-Polder force out of thermal equilibrium
Authors: G.V.Dedkov, A.A.Kyasov
Categories: cond-mat.other
Comments: 10 pages, 2 figures
   We calculate equilibrium and nonequilibrium Casimir-Polder force felt by a
small particle (an atom)near a flat substrate using the framework of
fluctuation electrodynamics in configuration of a small sphere above a flat
substrate. A numerical example is given for a SiC micron -sized particle above
a SiC substrate. Different temperature configurations are considered.
\\ ( , 118kb)
Date: Sat, 14 Feb 2009 12:29:39 GMT (203kb)

Title: Emergence of Topological Fermi Liquid from a Strongly Correlated Bosonic
   System in Optical Superlattices
Authors: Bo-lun Chen and Su-peng Kou
Categories: cond-mat.other cond-mat.str-el
Comments: 9 pages, 5 figures
   Recent experiments on quantum degenerate gases give an opportunity for
simulating strongly-correlated electronic systems in optical lattices. It may
shed light on some long-standing puzzles in condensed-matter physics, like the
nature of high-temperature superconductivity in cuprates that had baffled
people over two decades. It is believed that the two-dimensional fermionic
Hubbard model, or t-J model, contains the key to this problem; but the
difficulty of unveiling the mystery of a strongly-interacting fermionic system
is also generally acknowledged. Here, as a substitute, we systematically
analyze the property of bosonic t-J model simulated in optical superlattices
near unit-filling. In particular, we show the emergence of a strange
topological Fermi liquid with Fermi surfaces from a purely bosonic system. We
also discuss the possibility of observing these phenomena in ultracold atom
experiments. The result may provide some crucial insights into the origin of
high-T_{c} superconductivity.
\\ ( , 203kb)
Date: Sun, 15 Feb 2009 08:20:08 GMT (100kb)

Title: External force affected escape of Brownian particles from a potential
Authors: A. I. Shushin
Categories: cond-mat.soft cond-mat.stat-mech
Comments: 11 pages, 3 figures
   The effect of an external force on the kinetics of diffusion-assisted
escaping of Brownian particles from a potential well is analyzed in detail. The
analysis is made within the two-state model of the process which is known to be
valid in the deep well limit in the absence of external force. The generalized
variant of this model, taking into account the effect of the force, is shown to
be quite accurate as well for some shapes of the well. Within the generalized
two-state model simple expressions for the well depopulation kinetics and, in
particular, the for the escape rate are obtained. These expressions show that
the effect of the force ($F$) manifests itself in the escape rate dependence on
the only parameter $\varphi = Fa/(2k_b T)$, where $a$ is the Onzager radius of
the attractive part of the well $U(r)$, defined by the relation $|U(a)| = k_b
T$. The limiting behavior of this dependence in the cases of weak and strong
force is analyzed in detail. Possible applications as well as the relation of
the results of the analysis to those obtained earlier are briefly discussed.
\\ ( , 100kb)
Date: Sun, 15 Feb 2009 23:56:06 GMT (26kb,D)

Title: Modulation Spectroscopy and Dynamics of Double Occupancies in a
   Fermionic Mott Insulator
Authors: Rajdeep Sensarma, David Pekker, Mikhail D. Lukin and Eugene Demler
Categories: cond-mat.other cond-mat.str-el
Comments: 4 pages 2 figures
   We calculate the rate of creation of double occupancies in a 3D
   Fermionic Mott insulator near half-filling by modulation of optical lattice
potential. At high temperatures, incoherent holes lead to a broad response
peaked at the Hubbard repulsion $U$. At low temperatures, antiferromagnetic
order leads to a coherent peak for the hole along with broad features
representing spin wave shake-off processes. This is manifested in the doublon
creation rate as a sharp absorption edge and oscillations as a function of
modulating frequency. Thus, modulation spectroscopy can be used as a probe of
antiferromagnetic order and nature of quasiparticle excitations in the system.
\\ ( , 26kb)
Date: Mon, 16 Feb 2009 15:22:31 GMT (336kb)

Title: Quantum correlated light pulses from sequential superradiance of a
Authors: M.E. Tasgin, M.O. Oktel, L. You, and O.E. Mustecaplioglu
Categories: cond-mat.other
Comments: 10 pages, 6 figures
   We discover an inherent mechanism for entanglement swap associated with
sequential superradiance from an atomic Bose-Einstein condensate. Based on
careful examinations with both analytical and numerical approaches, we conclude
that as a result of the swap mechanism, Einstein-Podolsky-Rosen (EPR)-type
quantum correlations can be detected among the scattered light pulses.
\\ ( , 336kb)
Date: Mon, 16 Feb 2009 16:03:47 GMT (175kb)

Title: Short-Time Enhanced Decay of Coherent Excitations in Bose-Einstein
Authors: Nir Bar-Gill, Eitan E. Rowen, Gershon Kurizki and Nir Davidson
Categories: cond-mat.other
Comments: 4 pages, 5 figures
   We study, both experimentally and theoretically, short-time modifications of
the decay of excitations in a Bose-Einstein Condensate (BEC) embedded in an
optical lattice. Strong enhancement of the decay is observed compared to the
Golden Rule results. This enhancement of decay increases with the lattice
depth. It indicates that the description of decay modifications of few-body
quantum systems also holds for decay of many-body excitations of a BEC.
\\ ( , 175kb)
Date: Sun, 15 Feb 2009 18:42:32 GMT (206kb,D)

Title: Probing Interactions between Ultracold Fermions
Authors: G. K. Campbell, M. M. Boyd, J. W. Thomsen, M. J. Martin, S. Blatt, M.
   D. Swallows, T. L. Nicholson, T. Fortier, C. W. Oates, S. A. Diddams, N. D.
   Lemke, P. Naidon, P. Julienne, Jun Ye, A. D. Ludlow
Categories: physics.atom-ph cond-mat.other
Comments: Submitted to Science
   At ultracold temperatures, the Pauli exclusion principle suppresses
collisions between identical fermions. This has motivated the development of
atomic clocks using fermionic isotopes. However, by probing an optical clock
transition with thousands of lattice-confined, ultracold fermionic Sr atoms, we
have observed density-dependent collisional frequency shifts. These collision
effects have been measured systematically and are supported by a theoretical
description attributing them to inhomogeneities in the probe excitation process
that render the atoms distinguishable. This work has also yielded insights for
zeroing the clock density shift.
\\ ( , 206kb)
Date: Sat, 14 Feb 2009 02:32:38 GMT (127kb)

Title: Bistable Mott-insulator to superfluid phase transition in cavity
Authors: W. Chen, K. Zhang, D. S. Goldbaum, M. Bhattacharya, P. Meystre
Categories: quant-ph
Comments: 5 pages, 3 figures
   We study the many-body state of ultracold bosons in a bistable optical
lattice potential in an optomechanical resonator in the weak-coupling limit.
New physics arises as a result of bistability and discontinuous jumps in the
cavity field. Of particular interest is the situation where the optical cavity
is engineered so that a single input beam can result in two radically different
stable ground states for the intracavity gas: superfluid and Mott-insulator.
\\ ( , 127kb)
Date: Mon, 16 Feb 2009 09:20:25 GMT (101kb)

Title: Quantum Phases of Ultracold Bosonic Atoms in two Bands of an
   Optical-Lattice coupled by a Cavity Field
Authors: Hashem Zoubi, and Helmut Ritsch
Categories: quant-ph
Comments: 12 pages, 18 figures
   We study the quantum phase transitions between superfluid and Mott insulator
states for ultracold bosons occupying two bands of an optical lattice. The two
atomic states are resonantly coupled by a single cavity mode which mediates
transitions between the two bosonic particle modes via absorption or emission
of a cavity photon. This coupling between the bands shifts the appearance of
the Mott insulator phase towards deeper optical lattice potentials and stronger
on-site interaction strength, as atomic coherence can build up via photon
assisted tunneling in both bands. Varying the intra and interband on-site
interactions leads to several different atomic phase configurations. There are
even parameter regions where a mean field approach predicts concurrence of a
Mott insulator state in one band, while atoms in the second band stay
\\ ( , 101kb)
Date: Mon, 16 Feb 2009 17:40:09 GMT (133kb)

Title: Vapor pressure dependence of spectral width of EIT in Lambda-level
   cesium molecular system
Authors: Hui Chen, Hebin Li, Yuri V. Rostovtsev, Mikhail A. Gubin, Vladimir A.
   Sautenkov, and Marlan O. Scully
Categories: quant-ph
Comments: 7 pages, 3 figures
   We have studied electromagnetically induced transparency (EIT) in diatomic
cesium molecules in a vapor cell by using tunable diode lasers. We have
observed a sub-natural Lambda-resonance in an absorption molecular band at
different cesium vapor pressures. The width of the EIT resonance shows a linear
dependence on cesium vapor pressure. Narrow Lambda-resonances in molecules can
be used as frequency references for femtosecond laser frequency combs.
\\ ( , 133kb)
Date: Mon, 2 Feb 2009 00:26:57 GMT (111kb)

Title: Effects of a dilute gas of fermions on the superfluid-insulator phase
   diagram of the Bose-Hubbard model
Authors: Sumanta Tewari, Roman Lutchyn, S. Das Sarma
Categories: cond-mat.str-el quant-ph
Comments: 16 pages, 3 eps figures
   Building on the work of Fisher et al. (Phys. Rev. B 40, 546 (1989)), we
develop a framework for perturbation theory in the Bose-Hubbard model and apply
it to calculate the effects of a degenerate gas of spin-polarized fermions
interacting by contact interactions with the constituent bosons. For the
single-band Bose-Hubbard model, the only non-trivial effect of the fermions is
to induce an effective space- and time-dependent density-density interaction
among the bosons. Using a path integral formulation, we develop the appropriate
theory describing the perturbative effects of this fermion-mediated interaction
(fermionic screening) on the generic superfluid-insulator phase diagram. For
the single-band Bose-Hubbard model, we find that the net effect of the fermions
is to inherently suppress the Mott-insulating lobes and enhance the area
occupied by the superfluid phase in the phase diagram. For the more general
multi-band Bose-Hubbard model, we find that, in addition to the fermion
screening of the boson interactions, the virtual excitations of the bosons to
the higher Bloch bands coupled with the contact interactions with the fermions
result in an effective increase of the boson on-site repulsion. If this
renormalization of the boson on-site potential is dominant over the fermion
screening of the boson interactions, the area of the Mott insulating lobes of
the Bose-Hubbard phase diagram will be enhanced for either sign of the
boson-fermion interactions, as seen in recent experiments.
\\ ( , 111kb)
Date: Mon, 16 Feb 2009 09:07:15 GMT (120kb)

Title: The Ideal Gas Behavior is in Fact Nothing, But a Macroscopic Quantum
   Mechanical Manifestation
Authors: Tolga Yarman, Alexander L. Kholmetskii, Jean-Louis Tane
Categories: physics.class-ph physics.atom-ph
Comments: 14 pages, no figures
   This article mainly consists in the quantum mechanical study of an
adiabatically compressed particle, in an infinitely high well, which we
conjecture, can be considered as the basis of an ideal gas. Thus we prove that,
all the compression energy is, as may be expected, transformed into extra
kinetic energy of the particle. This result frames a quantum mechanical
definition of an ideal gas. It further helps the elucidation of a paradox.
\\ ( , 120kb)
Date: Mon, 16 Feb 2009 05:54:53 GMT (153kb)

Title: A Brief Overview of the Major Contribution to Physics by Landau
Authors: C Sivaram (1) and Kenath Arun (2) ((1) Indian Institute of
   Astrophysics, Bangalore; (2) Christ Junior College)
Categories: physics.gen-ph
Comments: This article highlights some of the major contribution to physics by
   the most versatile physicist, L D Landau
   Lev Davidovich Landau was arguably one of the greatest and most versatile
physicists. His work spans a very wide range and has had a considerable impact
on all areas of physics including condensed matter physics, plasma, high energy
and particle physics, fluid dynamics, astrophysics, gravitation, elasticity,
etc. Along with his former fellow student, E Lifshitz, he wrote the set of a
dozen volumes, the magnificent world-renowned Course of Theoretical Physics
which covered topics ranging from mechanics, classical theory of fields,
quantum mechanics, electrodynamics of continuous media, fluid dynamics, kinetic
theory, theory of elasticity, statistical physics and more.
\\ ( , 153kb)
Date: Tue, 17 Feb 2009 08:13:49 GMT (60kb)

Title: Pseudo-potential of an arbitrary isotropic interaction in
   two-dimensional systems
Authors: Sheng-Ming Shih and Daw-Wei Wang
Categories: cond-mat.other cond-mat.str-el
Comments: 5 pages and 2 figures
   We analytically derive the general pseudo-potential operator of an arbitrary
isotropic interaction for particles confined in two-dimensional (2D) systems,
using the same frame work developed by Huang and Yang for 3D scattering [Phys.
Rev. {\bf 105}, 767 (1957)]. We also analytically derive the low energy
dependence of the phase-shift for an arbitrary potential with a power-law
decaying tail, $V_{\rm 2D}(\rho)\propto \rho^{-\alpha}$ (for $\alpha>2$). We
apply our results to the 2D dipolar gases ($\alpha=3$) as an example,
calculating the momentum and dipole moment dependence of the pseudo-potential
for both $s$- and p-wave scattering channels if the two scattering particles
are in the same 2D layer. We also calculate the result for the s-wave
scattering between particles in two different (parallel) layers. Our analytic
and numerical results can be directly applied to the study of many-body
properties of magnetic dipolar atoms and/or polar molecules in a general 2D
\\ ( , 60kb)
Date: Tue, 17 Feb 2009 12:14:59 GMT (77kb)

Title: Supercurrent induced by tunneling Bogoliubov excitations in a
   Bose-Einstein condensate
Authors: Shunji Tsuchiya, Yoji Ohashi
Categories: cond-mat.supr-con cond-mat.other
Comments: 36 pages, 12 figures
   We study the tunneling of Bogoliubov excitations through a barrier in a
Bose-Einstein condensate. We extend our previous work [Phys. Rev. A {\textbf
78}, 013268 (2008)] to the case when condensate densities are different between
the left and right of the barrier potential. In the framework of the Bogoliubov
mean-field theory, we calculate the transmission probability and phase shift,
as well as the energy flux and quasiparticle current carried by Bogoliubov
excitations. We find that Bogoliubov phonons twist the condensate phase due to
a back-reaction effect, which induces the Josephson supercurrent. While the
total current given by the sum of quasiparticle current and induced
supercurrent is conserved, the quasiparticle current flowing through the
barrier potential is shown to be remarkably enhanced in the low energy region.
When the condensate densities are different between the left and right of the
barrier, the excess quasiparticle current, as well as the induced supercurrent,
remain finite far away from the barrier. We also consider the tunneling of
excitations and atoms through the boundary between the normal and superfluid
regions. We show that supercurrent can be generated inside the condensate by
injecting free atoms from outside. On the other hand, atoms are emitted when
the Bogoliubov phonons propagate toward the phase boundary from the superfluid
\\ ( , 77kb)
Date: Tue, 17 Feb 2009 19:19:50 GMT (30kb)

Title: Caustic formation in expanding condensates of cold atoms
Authors: J. T. Chalker, B. Shapiro
Categories: cond-mat.dis-nn cond-mat.other
Comments: 9 pages, 3 figures
   We study the evolution of density in an expanding Bose-Einstein condensate
that initially has a spatially varying phase, concentrating on behaviour when
these phase variations are large. In this regime large density fluctuations
develop during expansion. Maxima have a characteristic density that diverges
with the amplitude of phase variations and their formation is analogous to that
of caustics in geometrical optics. We analyse in detail caustic formation in a
quasi-one dimensional condensate, which before expansion is subject to a
periodic or random optical potential, and we discuss the equivalent problem for
a quasi-two dimensional system. We also examine the influence of many-body
correlations in the initial state on caustic formation for a Bose gas expanding
from a strictly one-dimensional trap. In additon, we study a similar
arrangement for non-interacting fermions, showing that Fermi surface
discontinuities in the momentum distribution give rise in that case to sharp
peaks in the spatial derivative of the density. We discuss recent experiments
and argue that fringes reported in time of flight images by Chen and co-workers
[Phys. Rev. A 77, 033632 (2008)] are an example of caustic formation.
\\ ( , 30kb)
Date: Tue, 17 Feb 2009 09:53:36 GMT (679kb,D)

Title: Exploiting the composite character of Rydberg atoms for cold atom
Authors: M. Mayle, I. Lesanovsky and P. Schmelcher
Categories: physics.atom-ph
Comments: 5 pages, 3 figures
   By investigating the quantum properties of magnetically trapped nS Rydberg
atoms, it is demonstrated that the composite nature of Rydberg atoms
significantly alters their trapping properties opposed to point-like particles
with the same magnetic moment. We show how the specific signatures of the
Rydberg trapping potential can be probed by means of ground state atoms that
are off-resonantly coupled to the Rydberg state via a two photon laser
transition. In addition, it is demonstrated how this approach provides new
possibilities for generating traps for ground state atoms. Simulated
time-of-flight pictures mirroring the experimental situation are provided.
\\ ( , 679kb)
Date: Tue, 17 Feb 2009 23:52:43 GMT (160kb)

Title: Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold
Authors: Andre Schirotzek, Cheng-Hsun Wu, Ariel Sommer, and Martin W. Zwierlein
Categories: cond-mat.other
Comments: 4 pages, 4 figures
   We have observed Fermi polarons, dressed spin down impurities in a spin up
Fermi sea of ultracold atoms. The polaron manifests itself as a narrow peak in
the impurities' rf spectrum that emerges from a broad incoherent background. We
determine the polaron energy and the quasiparticle residue for various
interaction strengths around a Feshbach resonance. At a critical interaction,
we observe the transition from polaronic to molecular binding. Here, the
imbalanced Fermi liquid undergoes a phase transition into a Bose liquid
coexisting with a Fermi sea.
\\ ( , 160kb)
Date: Wed, 18 Feb 2009 13:24:14 GMT (470kb)

Title: Theory of coherence in Bose-Einstein condensation phenomena in a
   microwave driven interacting magnon gas
Authors: Sergio M. Rezende
Categories: cond-mat.other cond-mat.stat-mech
Comments: 26 pages, 9 figures, 46 references
   Strong experimental evidences of the formation of quasi-equilibrium
Bose-Einstein condensation (BEC) of magnons at room temperature in a film of
yttrium iron garnet (YIG) excited by microwave radiation have been recently
reported. Here we present a theory for the magnon gas driven by a microwave
field far out of equilibrium showing that the nonlinear magnetic interactions
create cooperative mechanisms for the onset of a phase transition leading to
the spontaneous generation of quantum coherence and magnetic dynamic order in a
macroscopic scale. The theory provides rigorous support for the formation of a
BEC of magnons in a YIG film magnetized in the plane. We show that the system
develops coherence only when the microwave driving power exceeds a threshold
value and that the theoretical result for the intensity of the Brillouin light
scattering from the BEC as a function of power agrees with the experimental
data. The theory also explains quantitatively experimental measurements of
microwave emission from the uniform mode generated by the confluence of BEC
magnon pairs in a YIG film when the driving power exceeds a critical value.
\\ ( , 470kb)
Date: Wed, 18 Feb 2009 17:50:18 GMT (49kb)

Title: Josephson oscillations in binary mixtures of F=1 spinor BECs
Authors: B. Julia-Diaz, M. Guilleumas, M. Lewenstein, A. Polls, A. Sanpera
Categories: cond-mat.other
Comments: 3 figures, 4 pages
   We study Josephson oscillations of a two component Bose-Einstein condensate
(BEC) in a double well-potential. We demonstrate that in the strongly polarized
case, the less populated component exhibits anti-Josephson behavior, i.e.
oscillates in phase with the more populated one. For the case of balanced
populations, the oscillations frequency does not depend on atomic interactions.
Both effects may serve to control the Josephson oscillations and to measure
precisely the relevant scattering lengths.
\\ ( , 49kb)
Date: Wed, 18 Feb 2009 19:37:53 GMT (17kb)

Title: Gaussian phase-space representation of Fermion dynamics; Beyond the
   time-dependent-Hartree-Fock approximation
Authors: Saar Rahav, Shaul Mukamel
Categories: cond-mat.other cond-mat.stat-mech
Comments: 12 pages
   A Gaussian operator representation for the many body density matrix of
fermionic systems, developed by Corney and Drummond [Phys. Rev. Lett, v93,
260401 (2004)], is used to derive new approximation schemes for their dynamics.
In this approach the reduced single electron density matrix elements serve as
stochastic variables which satisfy an exact Fokker-Planck equation. The number
of variables scales as ~N^2 rather than ~exp(N) with the basis set size, and
the time dependent Hartree Fock approximation (TDHF) is recovered in the
"classical" limit. An approximate closed set of equations of motion for the one
and two-particle reduced density matrices, provides a direct generalization of
the TDHF.
\\ ( , 17kb)
Date: Wed, 18 Feb 2009 19:54:33 GMT (655kb,D)

Title: Ultracold atomic gas in non-Abelian gauge potentials: The case of
   constant Wilson loop
Authors: N. Goldman, A. Kubasiak, P. Gaspard and M. Lewenstein
Categories: cond-mat.mes-hall
Comments: To appear in Phys. Rev. A (12 pages, 2 appendices, 7 figures)
   Nowadays it is experimentally feasible to create artificial, and in
particular, non-Abelian gauge potentials for ultracold atoms trapped in optical
lattices. Motivated by this fact, we investigate the fundamental properties of
an ultracold Fermi gas in a non-Abelian U(2) gauge potential characterized by a
constant Wilson loop. Under this specific condition, the energy spectrum
exhibits a robust band structure with large gaps and reveals a new fractal
figure. The transverse conductivity is related to topological invariants and is
shown to be quantized when the Fermi energy lies inside a gap of the spectrum.
We demonstrate that the analogue of the integer quantum Hall effect for neutral
atoms survives the non-Abelian coupling and leads to a striking fractal phase
diagram. Moreover, this coupling induces an anomalous Hall effect as observed
in graphene.
\\ ( , 655kb)
Date: Wed, 18 Feb 2009 13:04:53 GMT (5kb)

Title: Ermakov-Lewis Invariants of the Gross-Pitaevskii Equation
Authors: J.M.F.Bassalo, P.T.S.Alencar, D.G.Silva, A.B.Nassar and M. Cattani
Categories: quant-ph
Comments: No figures 7 pages
   In this work we study the Ermakov-Lewis invariants of the non-linear
Gross-Pitaeviskii equation
\\ ( , 5kb)
Date: Wed, 18 Feb 2009 20:30:22 GMT (349kb)

Title: Dispersive interactions between atoms and non planar surfaces
Authors: Riccardo Messina, Diego A. R. Dalvit, Paulo A. Maia Neto, Astrid
   Lambrecht, and Serge Reynaud
Categories: quant-ph
Comments: 10 pages, 4 figures
   We calculate the dispersive force between a ground state atom and a non
planar surface. We present explicit results for a corrugated surface, derived
from the scattering approach at first order in the corrugation amplitude. A
variety of analytical results are derived in different limiting cases,
including the van der Waals and Casimir-Polder regimes. We compute numerically
the exact first-order dispersive potential for arbitrary separation distances
and corrugation wavelengths, for a Rubidium atom on top of a silicon or gold
corrugated surface. We discuss in detail the inadequacy of the proximity force
approximation, and present a simple but adequate approximation for computing
the potential.
\\ ( , 349kb)
Date: Wed, 18 Feb 2009 07:53:52 GMT (42kb)

Title: Cold Atom Space Clock with Counter-Propagating Atoms
Authors: Desheng Lv, Bin Wang, Tang Li, and Liang Liu
Categories: physics.atom-ph physics.ins-det
Comments: 8 pages, 1 figure
   We discuss the feasibility to realize a space cold atom clock with
counter-propagating cold atoms in microgravity. The design of the space clock
is based on atomic beam clock with a Ramsey cavity, except a magneto-optical
trap (MOT) is placed at each side. Cold atoms are launched from MOTs at both
side of the clock simultaneously and move at counter-direction towards each
other. The velocity of launched atoms is precisely controlled to the
Ramsauer-Townsend resonance so that no additional collision frequency shift is
taken place. Such a configuration can efficiently cancel the frequency shift
led from cavity phase shift and increase the signal to noise.
\\ ( , 42kb)
replaced with revised version Wed, 18 Feb 2009 09:04:18 GMT (212kb)

Title: Observation of recoil-induced resonances and electromagnetically induced
   absorption of cold atoms in diffuse light
Authors: Wen-zhuo Zhang, Hua-dong Cheng, Liang Liu, and Yu-zhu Wang
Categories: physics.atom-ph physics.optics
Comments: 5 pages, 6 figures
\\ ( , 212kb)
Date: Thu, 19 Feb 2009 00:53:39 GMT (560kb)

Title: Polarization Plateau in Atomic Fermi Gas Loaded on Triangular Optical
Authors: M. Okumura, S. Yamada, M. Machida, T. Sakai
Categories: cond-mat.str-el
   In order to demonstrate that atomic Fermi gas is a good experimental reality
in studying unsolved problems in frustrated interacting-spin systems, we
numerically examine the Mott core state emerged by loading two-component atomic
Fermi gases on triangular optical lattices. Consequently, we find that plateau
like structures are observable in the Mott core polarization as a function of
the population imbalance. These plateau states are caused by a flexibility that
the surrounding metallic region absorbs the excess imbalance to keep the
plateau states inside the Mott core. We also find spin patterns peculiar to the
plateau states inside the Mott core.
\\ ( , 560kb)
Date: Thu, 19 Feb 2009 11:35:39 GMT (150kb)

Title: Dynamics of a many-particle Landau-Zener model: inverse sweep
Authors: A.P. Itin and P. T\"orm\"a
Categories: cond-mat.other cond-mat.stat-mech
Comments: 3 pages. Submitted to CEWQO 2009 on 14th February
   We consider dynamics of a slowly time-dependent Dicke model, which represents
a many-body generalization of the Landau-Zener model. In particular, the model
describes narrow Feshbach resonance passage in an ultracold gas of Fermi atoms.
Adiabaticity is destroyed when a parameter crosses a critical value, even at
very slow sweeping rates of a parameter. The dynamics crucially depends on
direction of the sweep. We apply our recent analysis [A.P. Itin, P. Torma,
arXiv:0901.4778v1] to the "inverse" sweep through the resonance, corresponding
(in a context of Feshbach resonance passage) to dissociation of molecules. On a
level of the mean-field approximation, the dynamics is equivalent to a
molecular condensate formation from Bose atoms within a two-mode model. Mapping
the system to a Painlev\'e equation allows us to calculate deviation from
adiabaticity at very slow sweeps analytically.
\\ ( , 150kb)
Date: Thu, 19 Feb 2009 13:29:15 GMT (1148kb)

Title: Recoil-induced subradiance in a cold atomic gas
Authors: M.M. Cola, D. Bigerni, and N. Piovella
Categories: cond-mat.other
   Subradiance, i.e. the cooperative inhibition of spontaneous emission by
destructive interatomic interference, can be realized in a cold atomic sample
confined in a ring cavity and lightened by a two-frequency laser. The atoms,
scattering the photons of the two laser fields into the cavity-mode, recoil and
change their momentum. Under proper conditions the atomic initial momentum
state and the first two momentum recoil states form a three-level degenerate
cascade. A stationary subradiant state is obtained after that the scattered
photons have left the cavity, leaving the atoms in a coherent superposition of
the three collective momentum states. After a semiclassical description of the
process, we calculate the quantum subradiant state and its Wigner function.
Anti-bunching and quantum correlations between the three atomic modes of the
subradiant state are demonstrated.
\\ ( , 1148kb)
Date: Thu, 19 Feb 2009 16:37:56 GMT (1140kb)

Title: Glassy features of a Bose Glass
Authors: P. Buonsante, F. Massel, V. Penna, and A. Vezzani
Categories: cond-mat.stat-mech
Comments: 14 pages, 4 figures;
Journal-ref: Laser Physics 18 (5) (2008) 653
DOI: 10.1134/S1054660X08050174
   We study a two dimensionl Bose Hubbad model at a zero temperature with random
local potentials in the presence of either uniform or binary disorder. Many
low-energy metastable configurations are found with virtually the same energy
as the ground state. These are characterized by the same blotchy pattern of
the, in principle, complex nonzero local order parameter as the ground state.
Yet, unlike the ground state, each island exhibits an overall random
independent phase. The different phases in different coherent islands could
provide a further explanation for the lack of coherence observed in experiments
on Bose glasses.
\\ ( , 1140kb)
Date: Thu, 19 Feb 2009 16:44:02 GMT (594kb)

Title: Two atomic quantum dots interacting via coupling to BECs
Authors: Anna Posazhennikova, Wolfgang Belzig
Categories: cond-mat.other
Comments: 5 pages, 7 figures
   We consider a system of three weakly coupled Bose-Einstein condensates and
two atomic quantum dots embedded in the barriers between the condensates. Each
dot is coupled to two neighboring condensates by optical transitions and can be
described as a two-state system, or a pseudospin 1/2. Although there is no
direct coupling between the dots, an effective interaction between the
pseudospins is induced due to their coupling to the condensate reservoirs. We
investigate this effective interaction, depending on the strengths of the
dot-condensate coupling T and the direct coupling J between the condensates. In
particular, we show that an initially ferromagnetic arrangement of the two
pseudospins stays intact even for large T/J. However, antiferromagnetically
aligned spins undergo peculiar "breathing" modes for weak coupling T/J<1, while
for strong coupling the behaviour of the spins becomes uncorrelated.
\\ ( , 594kb)
Date: Thu, 19 Feb 2009 16:57:57 GMT (20kb)

Title: Resonant Atom-Dimer Relaxation in Ultracold Atoms
Authors: Kerstin Helfrich, H.-W. Hammer (Bonn U.)
Categories: cond-mat.other
Comments: 5 pages, 2 figures
Report-no: HISKP-TH-09/07
   Three-body systems with large scattering length display universal phenomena
associated with a discrete scaling symmetry. These phenomena include resonant
enhancement of three-body loss rates when an Efimov three-body resonance is at
the scattering threshold. In particular, there can be resonant peaks in the
atom-dimer relaxation rate for large positive scattering length. We improve
upon earlier studies and calculate the atom-dimer relaxation rate as a function
of temperature using a Bose-Einstein distribution for the thermal average. As
input, we use calculations of the atom-dimer scattering phase shifts from
effective field theory.
\\ ( , 20kb)
Date: Thu, 19 Feb 2009 17:59:36 GMT (737kb)

Title: A fully quantal molecular description for the spectra of bosons and
   fermions in the lowest Landau level
Authors: Constantine Yannouleas and Uzi Landman
Categories: cond-mat.mes-hall cond-mat.str-el
Comments: REVTEX 4. 6 pages with 1 color figure and 3 Tables. For related
   papers, see
   Through the introduction of a class of appropriate translationally invariant
trial wave functions, we show that the strong correlations in the lowest Landau
level (LLL) reflect in finite systems the emergence of intrinsic point-group
symmetries associated with rotations and vibrations of molecules formed through
particle localization. This quantal molecular description is universal, being
valid for both bosons and fermions, for both the yrast and excited states of
the LLL spectra, and for both low and high angular momenta. "Quantum-fluid"
physical pictures associated with Jastrow-type trial functions are shown to be
reducible to the molecular description introduced in this paper.
\\ ( , 737kb)

The replacements:

replaced with revised version Thu, 12 Feb 2009 21:15:03 GMT (198kb)

Title: Derivation of the fundamental equations of continuum thermodynamics from
   statistical mechanics
Authors: Walter Noll
Categories: cond-mat.stat-mech
Comments: 18 page file, one figure. The submission is an English translation of
   a 1955 paper published originally in German. The translation is due to
   Richard B. Lehoucq and Anatole Von Lilienfeld-Toal (see the acknowledgements
   appearing on the first page)
DOI: 10.1512/iumj.1955.4.54022
\\ ( , 198kb)
replaced with revised version Sun, 15 Feb 2009 06:26:39 GMT (330kb)

Title: Unusual decoherence in qubit measurements with a Bose-Einstein
Authors: D. Sokolovski and S.A. Gurvitz
Categories: quant-ph cond-mat.mes-hall
Comments: 5 pages, additional explanations related to experimental realization
   are added, typos corrected, Phys. Rev. A, in press
\\ ( , 330kb)
replaced with revised version Mon, 16 Feb 2009 03:16:44 GMT (462kb)

Title: Vortex sheet in rotating two-component Bose-Einstein condensates
Authors: Kenichi Kasamatsu and Makoto Tsubota
Categories: cond-mat.other cond-mat.mes-hall
Comments: 8 pages, 7 figures
Journal-ref: Phys. Rev. A 79, 023606 (2009)
\\ ( , 462kb)
replaced with revised version Sat, 14 Feb 2009 10:51:13 GMT (109kb)

Title: Quantum Mechanics
Authors: Hitoshi Kitada (University of Tokyo)
Categories: quant-ph
Comments: 168 pages, LaTeX, two idenities on pp.56-57 corrected
Report-no: KIMS-2003-12-15
Journal-ref: Lectures in Mathematical Sciences vol. 23, The University of
   Tokyo, 2005, ISSN 0919-8180, ISBN 1-000-01896-2
\\ ( , 109kb)
replaced with revised version Mon, 16 Feb 2009 04:18:56 GMT (429kb)

Title: Steering Bose-Einstein condensates despite time symmetry
Authors: Dario Poletti, Giuliano Benenti, Giulio Casati, Peter Hanggi, Baowen
Categories: physics.atom-ph
Comments: 4 pages, 5 figures
\\ ( , 429kb)
replaced with revised version Tue, 17 Feb 2009 02:35:21 GMT (560kb)

Title: Dynamics of rotating two-component Bose-Einstein Condensates
Authors: I. Corro, R.G. Scott, and A.M. Martin
Categories: cond-mat.other quant-ph
Comments: more material added. 9 pages, 6 figures
\\ ( , 560kb)
replaced with revised version Tue, 17 Feb 2009 13:24:15 GMT (1177kb)

Title: A two-state Raman coupler for coherent atom optics
Authors: J. E. Debs, D. D\"oring, N. P. Robins, C. Figl, P. A. Altin, J. D.
Categories: physics.atom-ph
Comments: 7 Pages, 4 figures: Revised and published in Optics Express
Journal-ref: J. E. Debs, D. D\"oring, N. P. Robins, C. Figl, P. A. Altin, and
   J. D. Close, "A two-state Raman coupler for coherent atom optics," Opt.
   Express 17, 2319-2325 (2009)
DOI: 10.1364/OE.17.002319
\\ ( , 1177kb)
replaced with revised version Wed, 18 Feb 2009 13:04:14 GMT (369kb)

Title: Observation of vortex formation in an oscillating trapped Bose-Einstein
Authors: E. A. L. Henn, J. A. Seman, E. R. F. Ramos, M. Caracanhas, P.
   Castilho, E. P. Olimpio, G. Roati, D. V. Magalh\~aes, K. M. F. Magalh\~aes,
   V.S. Bagnato
Categories: cond-mat.other cond-mat.mes-hall
Comments: text improved, figure added (total of 6), 5 pages
\\ ( , 369kb)
replaced with revised version Wed, 18 Feb 2009 12:45:11 GMT (336kb)

Title: Quantum correlated light pulses from sequential superradiance of a
Authors: M.E. Tasgin, M.O. Oktel, L. You, and O.E. Mustecaplioglu
Categories: cond-mat.other
Comments: 10 pages, 6 figures
\\ ( , 336kb)
arXiv:0810.4499 (*cross-listing*)
replaced with revised version Wed, 18 Feb 2009 13:20:33 GMT (611kb,D)

Title: Coupled Mode Equations and Gap Solitons for the 2D Gross-Pitaevskii
   equation with a non-separable periodic potential
Authors: Tom\'a\v{s} Dohnal and Hannes Uecker
Categories: nlin.PS math.AP physics.optics
Comments: 1. missing assumptions in Lemma 3.6 added; 2. Lemmas 4.2 and 4.5
   added; 3. smoothness assumptions on V(x) added
\\ ( , 611kb)
replaced with revised version Thu, 19 Feb 2009 12:31:56 GMT (589kb)

Title: The nonlinear Schroedinger equation for the delta-comb potential:
   quasi-classical chaos and bifurcations of periodic stationary solutions
Authors: D. Witthaut, K. Rapedius and H. J. Korsch
Categories: cond-mat.other
Comments: Enhanced and revised version, to appear in J. Nonlin. Math. Phys
\\ ( , 589kb)
replaced with revised version Thu, 19 Feb 2009 08:56:23 GMT (37kb)

Title: Quasiparticle excitations and dynamic susceptibilities in the BCS-BEC
Authors: J. Bauer and A.C. Hewson
Categories: cond-mat.supr-con cond-mat.str-el
Comments: 6 pages, 5 figures (minor amendments and additional reference)
Journal-ref: EPL 85 (2009) 27001
DOI: 10.1209/0295-5075/85/27001
\\ ( , 37kb)
replaced with revised version Thu, 19 Feb 2009 08:31:45 GMT (72kb)

Title: Nonequilibrium fluctuations, fluctuation theorems, and counting
   statistics in quantum systems
Authors: Massimiliano Esposito, Upendra Harbola and Shaul Mukamel
Categories: cond-mat.stat-mech
Comments: Accepted in Rev. Mod. Phys. v2: Some references added and typos
\\ ( , 72kb)
replaced with revised version Thu, 19 Feb 2009 10:06:12 GMT (903kb)

Title: Coherent collapse of a dipolar Bose-Einstein condensate for different
   trap geometries
Authors: J Metz, T Lahaye, B Fr\"ohlich, A Griesmaier, T Pfau, H Saito, Y
   Kawaguchi, and M Ueda
Categories: physics.atom-ph cond-mat.other
\\ ( , 903kb)

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,        
Matt's arXiv selection: weekly summary of cold-atom papers from
Legal stuff: Unless stated otherwise, this e-mail represents only the
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Received on Tue May 19 2009 - 08:39:43 EST

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