[Matts-arxiv] Matt's arXiv selection: week ending 15 May 2009

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Mon, 15 Jun 2009 14:33:33 +1000

Dear subscribers,

Simon Haine is responsible for the compilation of this week's abstracts. There
are 21 new preprints and 10 replacements:

Date: Thu, 7 May 2009 20:01:00 GMT (1326kb)

Title: Supersolidity of Cold Atomic Bose-Fermi mixtures in optical lattices
Authors: Peter P. Orth, Doron L. Bergman, and Karyn Le Hur
Categories: cond-mat.quant-gas
  We investigate a cold atomic mixture of spinless bosons and fermions in
two-dimensional optical lattices. In the presence of a nested Fermi surface,
the bosons may develop a fascinating supersolid behavior characterized by a
finite superfluid density as well as a spatial density wave order. Focusing on
the triangular lattice geometry and combining a general Landau-Ginzburg-Wilson
approach with microscopically derived mean-field theory, we find an exotic
supersolid phase at a fermionic band-filling of $n_f = 3/4$ with a Kagome-type
crystalline order. We also address the case of anisotropic hopping amplitudes,
and show that striped supersolid phases emerge on the square and triangular
lattices. For weak interactions, the supersolid competes with phase separation.
For strong intra- and inter-species interactions, with the total number of
fermions and bosons corresponding to one particle per site, the bosons form an
alternating Mott insulator ground state. Finally, for a mixture of
$^{87}\text{Rb}^{40}\text{K}$ and $^{23}\text{Na}^6\text{Li}$, we show that
supersolidity can be observed in the range of accessible temperatures in the
square lattice geometry.
\\ ( http://arxiv.org/abs/0905.1125 , 1326kb)
Date: Fri, 8 May 2009 00:00:43 GMT (95kb)

Title: $F$-wave pairing of cold atoms in optical lattices
Authors: Wei-Cheng Lee, Congjun Wu, S. Das Sarma
Categories: cond-mat.quant-gas cond-mat.supr-con
Comments: 7 pages, 5 figures
  The tremendous development of cold atom physics has opened up a whole new
opportunity to study novel states of matter which are not easily accessible in
solid state systems. Here we propose to realize the $f$-wave pairing
superfluidity of spinless fermions in the $p_{x,y}$-orbital bands of the two
dimensional honeycomb optical lattices. The non-trivial orbital band structure
rather than strong correlation effects gives rise to the unconventional pairing
with the nodal lines of the $f$-wave symmetry. With a confining harmonic trap,
zero energy Andreev bound states appear around the circular boundary with a
six-fold symmetry. The experimental realization and detection of this novel
pairing state are feasible.
\\ ( http://arxiv.org/abs/0905.1146 , 95kb)
Date: Fri, 8 May 2009 00:00:42 GMT (1646kb)

Title: Tunneling of strongly repulsive hard-sphere bosons in an optical lattice
  with tight external harmonic confinement: A quantum Monte Carlo investigation
  in continuous space
Authors: Asaad R. Sakhel, Jonathan L. Dubois, and Roger R. Sakhel
Categories: cond-mat.quant-gas cond-mat.other
  The effect of strongly repulsive interactions on the tunneling amplitude of
hard-sphere (HS) bosons confined in a simple cubic (sc) optical lattice plus
tight external harmonic confinement in continuous space is investigated. The
quantum variational Monte Carlo (VMC) and the variational path integral Monte
Carlo (VPI) techniques are used at zero temperature. The effects of the lattice
spacing $\pi/k$ and the occupancy of the lattice sites are also explored as a
function of the repulsion between the bosons. Our chief result is, that the
width of the wave function in each well does not broaden with a rise in the
repulsive interactions. We believe that the presence of a negative effective
bosonic mass generates a "fake" attractive force which overwhelms the
repulsion. This causes the bosons to behave as if there is an attractive force
between them pulling them together. It is found that the tunneling amplitude
decreases with a rise in the hard-sphere repulsion, and that the tunneling of
the bosons is directed away from the center of the trap towards the edges of
the trap. Further, it is found that the energy per particle at certain optical
depths is insensitive to the number of particles and variations in the HS
diameter of the bosons. In addition, the tunneling amplitude rises with a
reduction in the lattice spacing. In order to check the accuracy of our VMC
results, we compare them with corresponding VPI results.
\\ ( http://arxiv.org/abs/0905.1147 , 1646kb)
Date: Fri, 8 May 2009 15:08:45 GMT (310kb)

Title: Strongly Interacting Two-Dimensional Dirac Fermions in a Cold Atomic
Authors: Lih-King Lim, Achilleas Lazarides, Andreas Hemmerich, and C. Morais
Categories: cond-mat.quant-gas cond-mat.supr-con
  Strongly correlated low-dimensional electron systems exhibit a wealth of
interesting phenomena, ranging from high-temperature superconductivity in the
cuprates, to unconventional superconductivity in the heavy-fermion compounds
and the fractional quantum Hall effect in two-dimensional semiconducting
heterostructures. The recent breakthrough in fabricating sheets of graphene,
where the quasiparticles are two-dimensional Dirac fermions, has brought
renewed interest to the field. Graphene, however, turns out to be a weakly
interacting system. Here we propose a realization of strongly interacting
two-dimensional Dirac fermions with ultracold atoms in an optical lattice. The
tunable on-site and nearest-neighbor interactions allow for the stabilization
of an s-wave and an unconventional superconducting phases. In field theory, the
interplay between non-trivial topology and Dirac fermions is a prerequisite to
the occurrence of exotic phenomena. We show that a vortex in the unconventional
superconducting phase gives rise to number fractionalization of fermions.
\\ ( http://arxiv.org/abs/0905.1281 , 310kb)
arXiv:0905.0849 (*cross-listing*)
Date: Wed, 6 May 2009 15:04:31 GMT (214kb)

Title: Bose Condensation and the BTZ Black Hole
Authors: Cenalo Vaz and L.C.R. Wijewardhana
Categories: hep-th cond-mat.stat-mech gr-qc
Comments: 5 pages, 3 figures
  Although all popular models of quantum gravity are able to recover the
Bekenstein-Hawking entropy-area law in the thermodynamic limit, there are
significant differences in the microstates and in the application of
statistics. The use of different statistics would lead to divergent predictions
away from the thermodynamic limit or at very low temperatures. In this letter
we examine the Ba\~nados-Teitelboim-Zanelli (BTZ) black hole. It admits an
equispaced mass spectrum according to both the canonical and the AdS/CFT
approaches and the area law is recovered at high temperatures via Bose
statistics. In the picture that arises from canonical quantum gravity, the BTZ
black hole behaves essentially as a system of Bosonic mass shells moving in a
one dimensional harmonic trap. Condensation does not occur in the thermodynamic
limit. However, this system possesses a finite critical temperature, $T_c$, and
exhibits a large condensate fraction below $T_c$ when the number of shells is
\\ ( http://arxiv.org/abs/0905.0849 , 214kb)
Date: Tue, 28 Apr 2009 09:18:07 GMT (524kb)

Title: Wide cylindrical or spherical optical potentials from laser beam
Authors: Ole Steuernagel
Categories: physics.optics physics.atom-ph quant-ph
Comments: 15 pages, 13 figures
  Superpositions of paraxial Laguerre-Gauss laser beam modes to generate
optical potentials based on the optical dipole force are investigated
theoretically. Parabolic and other monomial potentials with even powers, in
cylindrical and spherical symmetry, with large diameters, can be synthesized.
This superposition approach promises to help with high quality atom cloud
manipulation and imaging.
\\ ( http://arxiv.org/abs/0904.4342 , 524kb)
Date: Fri, 8 May 2009 08:09:25 GMT (28kb)

Title: Measurement schemes for the spin quadratures on an ensemble of atoms
Authors: Ryo Namiki, Tetsushi Takano, Shin-Ichi-Ro Tanaka, Yoshiro Takahashi
Categories: quant-ph
Comments: 4pages 2 figures
  We consider how to measure collective spin states of an atomic ensemble based
on the recent multi-pass approaches for quantum interface between light and
atoms. We find that a scheme with two passages of a light pulse through the
atomic ensemble is efficient to implement the homodyne tomography of the spin
state. Thereby, we propose to utilize optical pulses as a phase-shifter that
rotates the quadrature of the spins. This method substantially simplifies the
geometry of experimental schemes.
\\ ( http://arxiv.org/abs/0905.1197 , 28kb)
Date: Sun, 10 May 2009 23:47:17 GMT (2570kb,D)

Title: Exact solutions and stability of rotating dipolar Bose-Einstein
  condensates in the Thomas-Fermi limit
Authors: R. M. W. van Bijnen, A. J. Dow, D. H. J. O'Dell, N. G. Parker and A.
  M. Martin
Categories: cond-mat.quant-gas
Comments: 12 pages with 6 figures
  We present a theoretical analysis of dilute gas Bose-Einstein condensates
with dipolar atomic interactions under rotation in elliptical traps. Working in
the Thomas-Fermi limit, we employ the classical hydrodynamic equations to first
derive the rotating condensate solutions and then consider their response to
perturbations. We thereby map out the regimes of stability and instability for
rotating dipolar Bose-Einstein condensates and in the latter case, discuss the
possibility of vortex lattice formation. We employ our results to propose
several novel routes to induce vortex lattice formation in a dipolar
\\ ( http://arxiv.org/abs/0905.1515 , 2570kb)
Date: Mon, 11 May 2009 03:23:43 GMT (49kb)

Title: Bose-Einstein condensation in quasi-2D systems: applications to high Tc
Authors: C. Villarreal and M. de Llano
Categories: cond-mat.supr-con cond-mat.quant-gas
Comments: 5 pages, 1 figure
  We describe high-Tc superconductivity in layered materials within a BCS
theory as a BEC of massless-like Cooper pairons satisfying a linear dispersion
relation, and propagating within quasi-2D layers of finite width defined by the
charge distribution about the CuO_2 planes. We obtain a closed formula for the
critical temperature, Tc, that depends on the layer width, the binding energy
of Cooper's pairs, and the average in-plane penetration depth. This formula
reasonably reproduces empirical values of superconducting transition
temperatures for several different cuprate materials near the optimal doping
regime, as well as for YBCO films with different doping degrees.
\\ ( http://arxiv.org/abs/0905.1535 , 49kb)
Title: Calculation of Drag and Superfluid Velocity from the Microscopic
  Parameters and Excitation Energies of a Two-Component Bose-Einstein
  Condensate on an Optical Lattice
Authors: Jacob Linder and Asle Sudb{\o}
Categories: cond-mat.quant-gas cond-mat.stat-mech
Comments: 11 pages, 5 figures. Accepted for publication in Phys. Rev. A
  We investigate a model of a two-component Bose-Einstein condensate residing
on an optical lattice. Within a Bogolioubov-approach at the mean-field level,
we derive exact analytical expressions for the excitation spectrum of the
two-component condensate when taking into account hopping and interactions
between arbitrary sites. Our results thus constitute a basis for works that
seek to clarify the effects of higher-order interactions in the system. We
investigate the excitation spectrum and the two branches of superfluid velocity
in more detail for two limiting cases of particular relevance. Moreover, we
relate the hopping and interaction parameters in the effective Bose-Hubbard
model to microscopic parameters in the system, such as the laserlight
wavelength and atomic masses of the components in the condensate. These results
are then used to calculate analytically and numerically the drag coefficient
between the components of the condensate. We find that the drag is most
effective close to the symmetric case of equal masses between the components,
regardless of the strength of the intercomponent interaction and the lattice
well depth.
\\ ( http://arxiv.org/abs/0905.1330 , 295kb)
Date: Sun, 10 May 2009 19:21:28 GMT (604kb)

Title: Does black-hole evaporation imply that physics is non-unitary, and if
  so, what must the laws of physics look like? An Essay
Authors: Steffen Gielen
Categories: quant-ph
Comments: 31 pages, 6 figures; revised and extended version of an essay
  originally submitted as part of the requirements for a Certificate of
  Advanced Study in Mathematics at Cambridge in 2007. Version accepted for
  publication as a review article in International Journal of Quantum
  Information (IJQI)
  Stephen Hawking's discovery of black hole evaporation had the remarkable
consequence that information is destroyed by a black hole, which can only be
accommodated by modifying the laws of quantum mechanics. Different attempts to
evade the information loss paradox were subsequently suggested, apparently
without a satisfactory resolution of the paradox. On the other hand, the
attempting to include non-unitarity into quantum mechanics might lead to laws
predicting observable consequences such as nonlocality or violation of
energy-momentum conservation; but it may be possibly to circumvent these
obstacles. Recent developments seem to require a different view on quantum
gravity and suggest that ideas about locality in physics and Hawking's
semi-classical approximation are misleading. An accurate description may show
unitary evolution and no information loss after all.
\\ ( http://arxiv.org/abs/0905.1497 , 604kb)
Title: Analytic description of atomic interaction at ultracold temperatures:
  the case of a single channel
Authors: Bo Gao
Categories: physics.atom-ph physics.chem-ph
Comments: 12 pages, 4 figures
  We present analytic descriptions of atomic interaction at ultracold
temperatures using both single-channel and multichannel quantum-defect
theories. In the case of a single channel, addressed in this paper, the
expansion of [B. Gao, Phys. Rev. A \textbf{58}, 4222 (1998)] is generalized to
higher orders for angular momentum $l\ge 2$ to give a more complete description
of ultracold scattering, including an analytic description of ultracold shape
resonances of arbitrary $l$. We also introduce a generalized scattering length
that is well defined and useful for all partial waves, to replace the
traditional definition that fails for $l\ge 2$ due to the long-range van der
Waals interaction. The results are used in a companion paper to derive analytic
descriptions of atomic interaction around a magnetic Feshbach resonance of
arbitrary angular momentum $l$.
\\ ( http://arxiv.org/abs/0905.1492 , 208kb)
Date: Mon, 11 May 2009 20:32:18 GMT (108kb)

Title: Mesoscopic quantum switching of a Bose-Einstein condensate in an optical
  lattice governed by the parity of the number of atoms
Authors: V. S. Shchesnovich
Categories: cond-mat.quant-gas
Comments: 4 pages, 3 figures in color
  It is shown that for a N-boson system the parity of N can be responsible for
a qualitative difference in the system dynamics. The nonlinear boson model is
considered, which describes tunneling of boson pairs between two distinct modes
X_{1,2} of the same energy and applies to a Bose-Einstein condensate in an
optical lattice. In a time-dependent lattice, the qualitative result of the
quantum switching depends on parity of N, i.e. X_1 -> X_2 for even N and X_1 ->
X_1 for odd N, for arbitrary large N. A simple scheme is proposed to observe
the parity effect by using the non-adiabatic bounce switching regime, which is
insensitive to the initial state preparation (as long as it is localized at one
of the X_l modes) and requires an experimentally accessible coherence time. As
distinct from the previous considerations, the dynamic parity effect can be
observed on the mesoscopic scale.
\\ ( http://arxiv.org/abs/0905.1708 , 108kb)
Date: Tue, 12 May 2009 12:54:16 GMT (398kb)

Title: Short-range correlations and entropy in ultracold atomic Fermi gases
Authors: Zhenhua Yu, Georg M. Bruun, and Gordon Baym
Categories: cond-mat.quant-gas cond-mat.other
Comments: 6 pages, 3 figures
  We relate short-range correlations in ultracold atomic Fermi gases to the
entropy of the system over the entire temperature, $T$, vs. coupling strength,
$-1/k_Fa$, plane. In the low temperature limit the entropy is dominated by
phonon excitations and the correlations increase as $T^4$. In the BEC limit, we
calculate a boson model within the Bogoliubov approximation to show explicitly
how phonons enhance the fermion correlations. In the high temperature limit, we
show from the virial expansion that the correlations decrease as $1/T$. The
correlations therefore reach a maximum at a finite temperature. We infer the
general structure of the isentropes of the Fermi gas in the $T,-1/k_Fa$ plane,
and the temperature dependence of the correlations in the unitary, BEC, and BCS
limits. Our results compare well with measurements of the correlations via
photoassociation experiments at higher temperatures.
\\ ( http://arxiv.org/abs/0905.1836 , 398kb)
Date: Wed, 13 May 2009 11:57:50 GMT (352kb)

Title: Atomic Josephson junction with two bosonic species
Authors: Giovanni Mazzarella, Marco Moratti, Luca Salasnich, Mario Salerno,
  Flavio Toigo
Categories: cond-mat.quant-gas
Comments: Accepted for the publication in J. Phys. B: At. Mol. Opt. Phys
  We study an atomic Josephson junction (AJJ) in presence of two interacting
Bose-Einstein condensates (BECs) confined in a double well trap. We assume that
bosons of different species interact with each other. The macroscopic wave
functions of the two components obey to a system of two 3D coupled
Gross-Pitaevskii equations (GPE). We write the Lagrangian of the system, and
from this we derive a system of coupled ordinary differential equations (ODE),
for which the coupled pendula represent the mechanic analogous. These
differential equations control the dynamical behavior of the fractional
imbalance and of the relative phase of each bosonic component. We perform the
stability analysis around the points which preserve the symmetry and get an
analytical formula for the oscillation frequency around the stable points. Such
a formula could be used as an indirect measure of the inter-species s-wave
scattering length. We also study the oscillations of each fractional imbalance
around zero and non zero - the macroscopic quantum self-trapping (MQST) - time
averaged values. For different values of the inter-species interaction
amplitude, we carry out this study both by directly solving the two GPE and by
solving the corresponding coupled pendula equations. We show that, under
certain conditions, the predictions of these two approaches are in good
agreement. Moreover, we calculate the crossover value of the inter-species
interaction amplitude which signs the onset of MQST.
\\ ( http://arxiv.org/abs/0905.2080 , 352kb)
Date: Wed, 13 May 2009 12:40:19 GMT (9kb)

Title: Exciting the Scissors Mode in crystals with strong spin-orbit coupling
  as in Bose-Einstein Condensates
Authors: Keisuke Hatada, Kuniko Hayakawa, Fabrizio Palumbo
Categories: cond-mat.str-el cond-mat.quant-gas
Comments: 5 pages, no figure
  In a recent study of the magnetic properties of rare-earth systems the two
extreme situations have been considered in which the crystalline electrostatic
field is large or small with respect to the spin-orbit interaction. In the
first case the orbitals of localized electrons are firmly coupled to the
lattice so that while an applied magnetic field rotates the spin, the charge
profile remains fixed to the lattice. In the second case an applied magnetic
field rotates both spin and density profile, even though through a very small
angle. We show that in this second case we have, in addition to the use of
photons or electrons, the possibility of exciting and observing the Scissors
Mode in crystals in a way analogous to that used in Bose-Einstein Condensates.
\\ ( http://arxiv.org/abs/0905.2100 , 9kb)
Date: Wed, 13 May 2009 13:31:36 GMT (8kb)

Title: Induced interactions and superfluidity in ultracold Fermi gases
Authors: H. Heiselberg
Categories: cond-mat.supr-con cond-mat.quant-gas
Comments: 3 pages
  Superfluidity and the physics behind high temperature superconductivity can
be studied in the highly controlled environment of ultracold Fermi atoms in
traps and optical lattices. Gorkov & Melik-Bharkudarov \cite{Gorkov} found that
many-body effects suppress BCS pairing by a factor $(4e)^{1/3}\simeq2.22$ in
three dimensions (3D). Here we calculate the corresponding suppression factor
$e\simeq2.72$ in two dimensions (2D). However, d-wave pairing is not suppressed
in 2D dilute Fermi gases. The s- and d-wave pairing gaps and critical
temperatures are also calculated for optical lattices at low (dilute) filling
as well as near half filling to leading orders in the interaction strength
including induced interactions. In 2D the induced interactions are singular at
half filling and strongly suppress s- and d-wave superfluidity.
\\ ( http://arxiv.org/abs/0905.2107 , 8kb)
Date: Wed, 13 May 2009 18:53:29 GMT (29kb)

Title: Ground-state fidelity in the BCS-BEC crossover
Authors: A. Khan, P. Pieri
Categories: cond-mat.stat-mech
Comments: 8 pages, 4 figures
  The ground-state fidelity has been introduced recently as a tool to
investigate quantum phase transitions. Here, we apply this concept in the
context of a crossover problem. Specifically, we calculate the fidelity
susceptibility for the BCS ground-state wave function, when the intensity of
the fermionic attraction is varied from weak to strong in an interacting Fermi
system, through the BCS-BEC crossover. Results are presented for contact and
finite-range attractive potentials and for both continuum and lattice models.
We conclude that the fidelity susceptibility can be useful also in the context
of crossover problems.
\\ ( http://arxiv.org/abs/0905.2165 , 29kb)
Date: Wed, 13 May 2009 11:42:49 GMT (17kb)

Title: Radio Frequency Response of the Strongly Interacting Fermi Gases at
  Finite Temperatures
Authors: S. Y. Chang
Categories: physics.atom-ph cond-mat.quant-gas
Comments: 2 figures
  The radio frequency spectrum of the fermions in the unitary limit at finite
temperatures is characterized by the sum rule relations. We consider a simple
picture where the atoms are removed by radio frequency excitations from the
strongly interacting states into a state of negligible interaction. We
calculate the moments of the response function in the range of temperature
$0.08 \epsilon_F < T < 0.8 \epsilon_F$ using an auxiliary field Monte Carlo
technique (AFMC) in which continuum auxiliary fields with a density dependent
shift are used. We estimate the effects of superfluid pairing from the clock
shift. We find a qualitative agreement with the pairing gap - pseudogap
transition behavior. We also find within the quasiparticle picture that in
order for the gap to come into quantitative agreement with the previously known
value at T=0, the effective mass has to be $m^* \sim 1.43 m$.
\\ ( http://arxiv.org/abs/0905.2072 , 17kb)
Date: Thu, 14 May 2009 03:30:27 GMT (1426kb)

Title: Soliton localization in Bose-Einstein condensates with time-dependent
  harmonic potential and scattering length
Authors: U. Al Khawaja
Categories: cond-mat.quant-gas cond-mat.other
Comments: 19 pages, 11 figures, accepted for publication in J.Phys.A
  We derive exact solitonic solutions of a class of Gross-Pitaevskii equations
with time-dependent harmonic trapping potential and interatomic interaction. We
find families of exact single-solitonic, multi-solitonic, and solitary wave
solutions. We show that, with the special case of an oscillating trapping
potential and interatomic interaction, a soliton can be localized indefinitely
at an arbitrary position. The localization is shown to be experimentally
possible for sufficiently long time even with only an oscillating trapping
potential and a constant interatomic interaction.
\\ ( http://arxiv.org/abs/0905.2241 , 1426kb)
Date: Thu, 14 May 2009 19:13:28 GMT (314kb)

Title: Zeeman slowing of thulium atoms
Authors: K. Chebakov, A. Sokolov, A. Akimov, D. Sukachev, S. Kanorsky, N.
  Kolachevsky, V. Sorokin
Categories: physics.optics
Comments: 3 pages, 4 figures
  We demonstrate laser slowing of a hot thulium atomic beam using the nearly
closed cycling transition
at 410.6 nm. Atoms are decelerated to velocities around 25 m/s by a 40 cm
Zeeman slower. The flux of slowed atoms is evaluated as $10^7
\textrm{s}^{-1}\textrm{cm}^{-2}$. The experiment explicitly indicates the
possibility of trapping Tm atoms in a magneto-optical trap.
\\ ( http://arxiv.org/abs/0905.2402 , 314kb)

The replacements:

replaced with revised version Fri, 8 May 2009 14:18:19 GMT (708kb)

Title: Anisotropic Instabilities in Trapped Spinor Bose-Einstein Condensates
Authors: M. Baraban, H. F. Song, S. M. Girvin, L. I. Glazman
Categories: cond-mat.other
Comments: 8 pages, 6 figures
Journal-ref: Phys. Rev. A 78, 033609 (2008)
\\ ( http://arxiv.org/abs/0807.1280 , 708kb)
replaced with revised version Fri, 8 May 2009 20:04:39 GMT (54kb)

Title: Spin squeezing and entanglement
Authors: Geza Toth, Christian Knapp, Otfried G\"uhne, Hans J. Briegel
Categories: quant-ph cond-mat.other cond-mat.stat-mech
Comments: 13 pages including 6 figures and 2 tables, revtex4; v3: published
Journal-ref: Phys. Rev. A 79, 042334 (2009)
DOI: 10.1103/PhysRevA.79.042334
\\ ( http://arxiv.org/abs/0806.1048 , 54kb)
replaced with revised version Sat, 9 May 2009 14:33:59 GMT (641kb)

Title: Transcritical flow of a Bose-Einstein condensate through a penetrable
Authors: A.M. Leszczyszyn, G.A. El, Yu.G. Gladush, A.M. Kamchatnov
Categories: cond-mat.other nlin.PS
Comments: Revised version. 22 pages, 24 figures. Accepted for publication in
  Phys. Rev. A
\\ ( http://arxiv.org/abs/0901.3767 , 641kb)
replaced with revised version Mon, 11 May 2009 09:43:07 GMT (160kb)

Title: Critical Velocity in a Bose Gas in a Moving Optical Lattice at Finite
Authors: Emiko Arahata, Tetsuro Nikuni
Categories: cond-mat.other
Comments: 9 pages, 5 figures
\\ ( http://arxiv.org/abs/0903.2111 , 160kb)
replaced with revised version Tue, 12 May 2009 15:04:14 GMT (460kb)

Title: Coherent single atom shuttle between two Bose-Einstein condensates
Authors: Uwe R. Fischer, Christian Iniotakis, Anna Posazhennikova
Categories: cond-mat.other quant-ph
Comments: 4 pages of RevTex4, 4 figures; Rapid Communication in Physical Review
Journal-ref: Phys. Rev. A 77, 031602(R) (2008)
DOI: 10.1103/PhysRevA.77.031602
\\ ( http://arxiv.org/abs/0709.1542 , 460kb)
replaced with revised version Tue, 12 May 2009 09:24:43 GMT (1552kb)

Title: Ab-initio determination of Bose-Hubbard parameters for two ultracold
  atoms in an optical lattice using a three-well potential
Authors: Philipp-Immanuel Schneider, Sergey Grishkevich, and Alejandro Saenz
Categories: quant-ph
Comments: 14 pages, 11 figures; typos and minor errors corrected, five
  references added, next-to-nearest neighbor hopping included in extended
  Bose-Hubbard model
\\ ( http://arxiv.org/abs/0903.3185 , 1552kb)
replaced with revised version Tue, 12 May 2009 17:40:33 GMT (2876kb)

Title: Exact theoretical description of two ultracold atoms in a single site of
  a 3D optical lattice using realistic interatomic interaction potentials
Authors: Sergey Grishkevich and Alejandro Saenz
Categories: quant-ph cond-mat.quant-gas
Comments: 18 pages, 10 figures
\\ ( http://arxiv.org/abs/0904.2504 , 2876kb)
replaced with revised version Wed, 13 May 2009 12:39:00 GMT (525kb)

Title: Normal-Superfluid Interface for Polarized Fermion Gases
Authors: Bert Van Schaeybroeck, Achilleas Lazarides
Categories: cond-mat.other cond-mat.stat-mech cond-mat.supr-con
Comments: 11 pages, 5 figures
Journal-ref: Phys. Rev. A 79, 053612 (2009)
DOI: 10.1103/PhysRevA.79.053612
\\ ( http://arxiv.org/abs/0807.3636 , 525kb)
replaced with revised version Wed, 13 May 2009 19:20:15 GMT (475kb)

Title: p-wave resonant Bose gas: a "spinor supersolid"
Authors: Leo Radzihovsky, Sungsoo Choi
Categories: cond-mat.quant-gas cond-mat.other
Comments: 4 pages, 1 figure
\\ ( http://arxiv.org/abs/0904.3738 , 475kb)
replaced with revised version Thu, 14 May 2009 15:28:10 GMT (67kb)

Title: Two-dimensional weakly interacting Bose gas: equation of state
Authors: G.E. Astrakharchik, J. Boronat, J. Casulleras, I.L. Kurbakov, and
  Yu.E. Lozovik
Categories: quant-ph cond-mat.other
Comments: New data points added at smaller densities. Correspondingly Table I,
  Figs. 1 and 2 are updated. Results by L. Pricoupenko (Ref [15]) are given in
  Table II. Comment [25] by Y. Castin is added. Minor changes in response to
  referee comments
Journal-ref: Phys. Rev. A 79, 051602(R) (2009)
\\ ( http://arxiv.org/abs/0812.3844 , 67kb)

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/
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