# Matt's arXiv selection: week ending 6 April 2007.

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Tue, 10 Apr 2007 11:09:49 +1000 (EST)

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

Hi everyone,

Hope you had a good Easter weekend. There are 24 new abstracts and 13
replacements this week. One that caught my eye was the report of the
observation of the BKT phase in a 2D lattice at JILA.

One other thing to note is that the arXiv switched its identifier scheme from
the beginning of April, as seen in the later submissions below.

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Paper: cond-mat/0703805
Date: Fri, 30 Mar 2007 09:38:44 GMT (218kb,D)

Title: Multicomponent Bright Solitons in F = 2 Spinor Bose-Einstein Condensates
Authors: Masaru Uchiyama, Jun'ichi Ieda, Miki Wadati
Categories: cond-mat.other
Subj-class: Other
\\
We study soliton solutions for the Gross--Pitaevskii equation of the spinor
Bose--Einstein condensates with hyperfine spin F=2 in one-dimension. Analyses
are made in two ways: by assuming single-mode amplitudes and by generalizing
Hirota's direct method for multi-components. We obtain one-solitons of
single-peak type in the ferromagnetic, polar and cyclic states, respectively.
Moreover, twin-peak type solitons both in the ferromagnetic and the polar state
are found.
\\ ( http://arXiv.org/abs/cond-mat/0703805 , 49kb)
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Paper: cond-mat/0703816
Date: Fri, 30 Mar 2007 14:04:20 GMT (218kb)

Title: Does Fulleride Superconductivity Crossover Contain a Feshbach Resonance?
Authors: Richard H. Squire and Norman H. March
Categories: cond-mat.supr-con cond-mat.str-el
Subj-class: Superconductivity; Strongly Correlated Electrons
\\
The pioneering works by Eagles, Leggett, and Nozieres/Schmitt-Rink (reviewed
and augmented by Randeria) emphasize that in the limits of the models studied
both at T = 0 and, the cross-over from a BCS-type to a BEC-type superconductor
is continuous. The BCS and BEC end points seem to be well-established. However,
in the intermediate region, home to fulleride and high temperature
superconductors, considerable extrapolation of the models must be done as there
still is no exact theory. Yet, considerable current literature is devoted to
what appears to be more singular-type phenomena such as quantum critical
points, stripe formation, insulator to superconductor phase transitions, loss
of validity of the Fermi liquid theory, etc.
Using a connection we have made with cold atom Fermion-Boson crossover
theory, we can establish that the resonance previously discussed is a result of
the crossing of the Fermion band by the Boson band. While the ground and singly
excited states appear to remain continuous, the collective modes due to the
resonance transform the nature of the superconductivity. We discuss features of
the resonance and the experimentally observed pre-formed BEC Cooper pair
formation in fullerides, essential to the Boson-Fermion resonance theory. In
addition some of the various singular phenomena discussed above can be put into
perspective.
PACS numbers: 61.48.+c, 74.20.-z, 81.05Tp
\\ ( http://arXiv.org/abs/cond-mat/0703816 , 218kb)
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Paper (*cross-listing*): math-ph/0703086
Date: Thu, 29 Mar 2007 15:32:19 GMT (18kb)

Title: The BCS Model for General Pair Interactions
Authors: Christian Hainzl, Eman Hamza, Robert Seiringer, Jan Philip Solovej
Categories: math-ph cond-mat.supr-con math.MP
Subj-class: Mathematical Physics; Superconductivity
\\
We present a rigorous analysis of the Bardeen-Cooper-Schrieffer (BCS) model
for general pair interaction potentials. For both zero and positive
temperature, we show that the existence of a non-trivial solution of the
nonlinear BCS gap equation is equivalent to the existence of a negative
eigenvalue of a certain effective linear operator. From this we conclude the
existence of a critical temperature below which the BCS pairing wave function
does not vanish identically. For attractive potentials, we prove that the
critical temperature is non-zero and exponentially small in the strength of the
potential.
\\ ( http://arXiv.org/abs/math-ph/0703086 , 18kb)
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arXiv:0704.0006
Date: Sat, 31 Mar 2007 04:24:59 GMT (901kb)

Title: Bosonic characters of atomic Cooper pairs across resonance
Authors: Y. H. Pong and C. K. Law
Categories: cond-mat.mes-hall
Comments: 6 pages, 4 figures, accepted by PRA
\\
We study the two-particle wave function of paired atoms in a Fermi gas with
tunable interaction strengths controlled by Feshbach resonance. The Cooper pair
wave function is examined for its bosonic characters, which is quantified by
the correction of Bose enhancement factor associated with the creation and
annihilation composite particle operators. An example is given for a
three-dimensional uniform gas. Two definitions of Cooper pair wave function are
examined. One of which is chosen to reflect the off-diagonal long range order
(ODLRO). Another one corresponds to a pair projection of a BCS state. On the
side with negative scattering length, we found that paired atoms described by
ODLRO are more bosonic than the pair projected definition. It is also found
that at $(k_F a)^{-1} \ge 1$, both definitions give similar results, where more
than 90% of the atoms occupy the corresponding molecular condensates.
\\ ( http://arXiv.org/abs/0704.0006.abs , 901kb)
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arXiv:0704.0082
Date: Sun, 1 Apr 2007 12:26:50 GMT (262kb)

Title: Matter-Wave Bright Solitons with a Finite Background in Spinor
Bose-Einstein Condensates
Categories: cond-mat.other cond-mat.stat-mech
Comments: 18 pages, 4 figures, LaTeX
\\
We investigate dynamical properties of bright solitons with a finite
background in the F=1 spinor Bose-Einstein condensate (BEC), based on an
integrable spinor model which is equivalent to the matrix nonlinear
Schr\"{o}dinger equation with a self-focusing nonlineality. We apply the
inverse scattering method formulated for nonvanishing boundary conditions. The
resulting soliton solutions can be regarded as a generalization of those under
vanishing boundary conditions. One-soliton solutions are derived in an explicit
manner. According to the behaviors at the infinity, they are classified into
two kinds, domain-wall (DW) type and phase-shift (PS) type. The DW-type implies
the ferromagnetic state with nonzero total spin and the PS-type implies the
polar state, where the total spin amounts to zero. We also discuss two-soliton
collisions. In particular, the spin-mixing phenomenon is confirmed in a
collision involving the DW-type. The results are consistent with those of the
previous studies for bright solitons under vanishing boundary conditions and
dark solitons. As a result, we establish the robustness and the usefulness of
the multiple matter-wave solitons in the spinor BECs.
\\ ( http://arXiv.org/abs/0704.0082.abs , 262kb)
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arXiv:0704.0122
Date: Mon, 2 Apr 2007 05:15:28 GMT (628kb)

Title: Spinor dipolar Bose-Einstein condensates; Classical spin approach
Authors: M. Takahashi Sankalpa Ghosh T. Mizushima K. Machida
Categories: cond-mat.other
\\
Magnetic dipole-dipole interaction dominated Bose-Einstein condensates are
discussed under spinful situations. We treat the spin degrees of freedom as a
classical spin vector, approaching from large spin limit to obtain an effective
minimal Hamiltonian; a version extended from a non-linear sigma model. By
solving the Gross-Pitaevskii equation we find several novel spin textures where
the mass density and spin density are strongly coupled, depending upon trap
geometries due to the long-range and anisotropic natures of the dipole-dipole
interaction.
\\ ( http://arXiv.org/abs/0704.0122.abs , 628kb)
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arXiv:0704.0146
Date: Mon, 2 Apr 2007 09:01:26 GMT (372kb)

Title: Vortices in Bose-Einstein Condensates: Theory
Authors: N. G. Parker, B. Jackson, A. M. Martin, and C. S. Adams
Categories: cond-mat.other
Comments: 17 pages, 2 figures. Book chapter to appear in "Emergent Nonlinear
Phenomena in Bose-Einstein condensates: Theory and Experiment"
(Springer-Verlag).
\\
Vortices are pervasive in nature, representing the breakdown of laminar fluid
flow and hence playing a key role in turbulence. The fluid rotation associated
with a vortex can be parameterized by the circulation $\Gamma=\oint {\rm d}{\bf r}\cdot{\bf v}({\bf r})$ about the vortex, where ${\bf v}({\bf r})$ is the
fluid velocity field. While classical vortices can take any value of
circulation, superfluids are irrotational, and any rotation or angular momentum
is constrained to occur through vortices with quantized circulation. Quantized
vortices also play a key role in the dissipation of transport in superfluids.
In BECs quantized vortices have been observed in several forms, including
single vortices, vortex lattices, and vortex pairs and rings. The recent
observation of quantized vortices in a fermionic gas was taken as a clear
signature of the underlying condensation and superfluidity of fermion pairs. In
addition to BECs, quantized vortices also occur in superfluid Helium, nonlinear
optics, and type-II superconductors.
\\ ( http://arXiv.org/abs/0704.0146.abs , 372kb)
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arXiv:0704.0233
Date: Mon, 2 Apr 2007 16:52:05 GMT

Title: Many-body interband tunneling as a witness for complex dynamics in the
Bose-Hubbard model
Authors: Andrea Tomadin, Riccardo Mannella, and Sandro Wimberger
Categories: cond-mat.other
Journal-ref: Phys. Rev. Lett. 98, 130402 (2007)
DOI: 10.1103/PhysRevLett.98.130402
\\
A perturbative model is studied for the tunneling of many-particle states
from the ground band to the first excited energy band, mimicking Landau-Zener
decay for ultracold, spinless atoms in quasi-one dimensional optical lattices
subjected to a tunable tilting force. The distributions of the computed
tunneling rates provide an independent and experimentally accessible signature
of the regular-chaotic transition in the strongly correlated many-body dynamics
of the ground band.
\\ ( http://arXiv.org/abs/0704.0233.abs , )
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arXiv:0704.0289
Date: Mon, 2 Apr 2007 23:51:32 GMT (292kb)

Title: Kosterlitz-Thouless Crossover on a Two-Dimensional Lattice of
Josephson-Coupled Bose-Einstein Condensates
Authors: V. Schweikhard, S. Tung, and E. A. Cornell
Categories: cond-mat.mes-hall
\\
We observe the Kosterlitz-Thouless crossover in a two-dimensional array of
Josephson-coupled Bose-Einstein condensates. As long as the Josephson
(tunneling) energy J exceeds the thermal energy T, i.e. $J/T \gtrsim 1$, the
array is vortex-free. With decreasing J/T, vortices appear in the system,
destroying long-range phase coherence. We confirm thermal activation as the
vortex formation mechanism and obtain information on the size of bound vortex
pairs as J/T is varied.
\\ ( http://arxiv.org/abs/0704.0289 , 292kb)
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arXiv:0704.0385
Date: Tue, 3 Apr 2007 13:11:30 GMT (49kb)

Title: Super-shell structures and pairing in ultracold trapped Fermi gases
Authors: M. Ogren and H. Heiselberg
Categories: cond-mat.other
\\
We calculate level densities and pairing gaps for an ultracold dilute gas of
fermionic atoms in harmonic traps under the influence of mean field and
anharmonic quartic trap potentials. Super-shell structures, which were found in
Hartree-Fock calculations, are calculated analytically within periodic orbit
theory as well as from WKB calculations. For attractive interactions, the
underlying level densities are crucial for pairing and super-shell structures
in gaps are predicted.
\\ ( http://arxiv.org/abs/0704.0385 , 49kb)
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arXiv:0704.0396
Date: Tue, 3 Apr 2007 13:53:07 GMT (48kb)

Title: Finite-temperature phase transitions in a two-dimensional boson Hubbard
model
Authors: Min-Chul Cha and Ji-Woo Lee
Categories: cond-mat.str-el
\\
We study finite-temperature phase transitions in a two-dimensional boson
Hubbard model with zero-point quantum fluctuations via Monte Carlo simulations
of quantum rotor model, and construct the corresponding phase diagram.
Compressibility shows a thermally activated gapped behavior in the insulating
regime. Finite-size scaling of the superfluid stiffness clearly shows the
nature of the Kosterlitz-Thouless transition. The transition temperature,
$T_c$, confirms a scaling relation $T_c \propto \rho_0^x$ with $x=1.0$. Some
evidences of anomalous quantum behavior at low temperatures are presented.
\\ ( http://arxiv.org/abs/0704.0396 , 48kb)
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arXiv:0704.0440
Date: Tue, 3 Apr 2007 19:02:39 GMT (107kb)

Title: Dynamics of a quantum phase transition in a ferromagnetic Bose-Einstein
condensate
Authors: Bogdan Damski and Wojciech H. Zurek
Categories: cond-mat.other
Report-no: LAUR-07-1400
\\
We discuss dynamics of a slow quantum phase transition in a spin-1
Bose-Einstein condensate. We determine analytically the scaling properties of
the system magnetization and verify them with numerical simulations in a one
dimensional model.
\\ ( http://arxiv.org/abs/0704.0440 , 107kb)
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arXiv:0704.0447
Date: Tue, 3 Apr 2007 17:38:41 GMT (784kb)

Title: Manipulating the rotational properties of a two-component Bose gas
Authors: J. Christensson (1), S. Bargi (1), K. Karkkainen (1), Y. Yu (1), G. M.
Kavoulakis (1), M. Manninen (2), and S. M. Reimann (1) ((1) LTH, Lund, (2)
Categories: cond-mat.mes-hall
Comments: 4 pages, RevTex, 4 figures
\\
A rotating, two-component Bose-Einstein condensate is shown to exhibit
vortices of multiple quantization, which are possible due to the interatomic
interactions between the two species. Also, persistent currents are absent in
this system. Finally, the order parameter has a very simple structure for a
range of angular momenta.
\\ ( http://arxiv.org/abs/0704.0447 , 784kb)
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arXiv:0704.0386
Date: Tue, 3 Apr 2007 13:11:40 GMT (20kb)

Title: Quantum non-local effects with Bose-Einstein condensates
Authors: Franck Lalo{\"e} (LKB - Lhomond), William J. Mullin
Categories: quant-ph
Proxy: ccsd hal-00139664
\\
We study the properties of double Bose-Einstein condensates in different spin
states, represented quantum mechanically by double Fock states. We assume that
individual measurements of the spins of the particles are performed in
transverse directions (perpendicular to the spin quantization axis), giving
access to the relative phase of the condensates. Initially, this phase is
completely undefined, and the first measurements provide purely random results.
But a fixed value of this phase rapidly emerges value under the effect of the
successive quantum measurements, giving rise to a quasi-classical situation
where all spins have parallel transverse orientations. If the number of
measurements reaches its maximum value (the number of particles), this
classical phase disappears and quantum effects show up again. These effects can
give rise to substantial violations of Bell type inequalities, comparable to
those obtained with two spins in singlet state, even if the total number of
particles involved is very large.
\\ ( http://arxiv.org/abs/0704.0386 , 20kb)
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arXiv:0704.0291
Date: Tue, 3 Apr 2007 06:35:53 GMT (336kb)

Title: Approaching the Heisenberg limit in an atom laser
Authors: M. Jeppesen and J. Dugu\'e and G. Dennis and M. T. Johnsson and C.
Figl and N. P. Robins and J. D. Close
Categories: physics.atom-ph
\\
We present experimental results showing the decreased divergence and improved
transverse profile of an atom laser produced by an optical Raman transition,
compared to one produced by an RF transition. We present a theoretical model to
compare with experimental results and find excellent agreement. This model
predicts a limit to the beam quality of a Raman atom laser. This limit is a
factor of 1.3 above the fundamental (Heisenberg) limit.
\\ ( http://arxiv.org/abs/0704.0291 , 336kb)
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arXiv:0704.0480
Date: Wed, 4 Apr 2007 01:41:48 GMT (40kb,D)

Title: Enhanced quantum Zeno effect and bunching in the decay of interacting
bosons from an unstable state
Authors: Sungyun Kim, Artem Dudarev and Joachim Brand
Categories: cond-mat.mes-hall
\\
We theoretically study the decay of two interacting bosons from a leaky trap
by tunneling through a potential barrier. Although decay rates are generally
enhanced by repulsive interactions, we predict a strong suppression of the
decay for short times. This leads to an enhancement of the quantum Zeno effect.
Results from perturbation theory are supplemented by numerical calculations of
the eigenstates and the full time dynamics. In the two-body correlations of the
escaping particles we find bunching and oscillations characteristic of the
interactions within the box.
\\ ( http://arxiv.org/abs/0704.0480 , 40kb)
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arXiv:0704.0476
Date: Wed, 4 Apr 2007 00:05:29 GMT (198kb)

Title: Geometric phase of an atom inside an adiabatic radio frequency potential
Authors: P. Zhang and L. You
Categories: quant-ph
Comments: 12 pages, 7 figures, submitted to Phys. Rev. A
\\
We investigate the geometric phase of an atom inside an adiabatic radio
frequency (rf) potential created from a static magnetic field (B-field) and a
time dependent rf field. The spatial motion of the atomic center of mass is
shown to give rise to a geometric phase, or Berry's phase, to the adiabatically
evolving atomic hyperfine spin along the local B-field. This phase is found to
depend on both the static B-field along the semi-classical trajectory of the
atomic center of mass and an effective magnetic field'' of the total B-field,
including the oscillating rf field. Specific calculations are provided for
several recent atom interferometry experiments and proposals utilizing
\\ ( http://arxiv.org/abs/0704.0476 , 198kb)
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arXiv:0704.0606
Date: Wed, 4 Apr 2007 16:32:29 GMT (72kb)

Title: Three-dimensional effects in "atom diodes": atom-optical devices for
one-way motion
Authors: A. Ruschhaupt and J. G. Muga
Categories: quant-ph
\\
The atom diode'' is a laser device that lets the ground state atom pass in
one direction but not in the opposite direction. We examine three-dimensional
effects of that device for arbitrary atomic incidence angles on flat laser
sheets and set breakdown limiting angles and velocities. It is found that a
correct diodic behavior independent of the incident angle can be obtained with
blue detuned lasers.
\\ ( http://arxiv.org/abs/0704.0606 , 72kb)
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arXiv:0704.0641
Date: Wed, 4 Apr 2007 19:19:06 GMT (215kb)

Title: Quantum engineering of photon states with entangled atomic ensembles
Authors: D. Porras J.I. Cirac
Categories: quant-ph
\\
We propose and analyze a new method to produce single and entangled photons
which does not require cavities. It relies on the collective enhancement of
light emission as a consequence of the presence of entanglement in atomic
ensembles. Light emission is triggered by a laser pulse, and therefore our
scheme is deterministic. Furthermore, it allows one to produce a variety of
photonic entangled states by first preparing certain atomic states using simple
sequences of quantum gates. We analyze the feasibility of our scheme, and
particularize it to: ions in linear traps, atoms in optical lattices, and in
cells at room temperature.
\\ ( http://arxiv.org/abs/0704.0641 , 215kb)
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arXiv:0704.0650
Date: Wed, 4 Apr 2007 20:05:57 GMT (229kb)

Title: Coherent macroscopic quantum tunneling in boson-fermion mixtures
Authors: D. Mozyrsky, I. Martin, E. Timmermans
Categories: cond-mat.mes-hall cond-mat.str-el
\\
We show that the cold atom systems of simultaneously trapped Bose-Einstein
condensates (BEC's) and quantum degenerate fermionic atoms provide promising
laboratories for the study of macroscopic quantum tunneling. Our theoretical
studies reveal that the spatial extent of a small trapped BEC immersed in a
Fermi sea can tunnel and coherently oscillate between the values of the
separated and mixed configurations (the phases of the phase separation
transition of BEC-fermion systems). We evaluate the period, amplitude and
dissipation rate for $^{23}$Na and $^{40}$K-atoms and we discuss the
experimental prospects for observing this phenomenon.
\\ ( http://arxiv.org/abs/0704.0650 , 229kb)
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arXiv:0704.0653
Date: Wed, 4 Apr 2007 20:36:42 GMT (202kb)

Title: St\"uckelberg interferometry' with ultracold molecules
Authors: M. Mark, T. Kraemer, P. Waldburger, J. Herbig, C. Chin, H.-C. Naegerl,
R. Grimm
Categories: cond-mat.other
\\
We report on the realization of a time-domain St\"uckelberg interferometer',
which is based on the internal state structure of ultracold Feshbach molecules.
Two subsequent passages through a weak avoided crossing between two different
orbital angular momentum states in combination with a variable hold time lead
to high-contrast population oscillations. This allows for a precise
determination of the energy difference between the two molecular states. We
demonstrate a high degree of control over the interferometer dynamics. The
interferometric scheme provides new possibilities for precision measurements
with ultracold molecules.
\\ ( http://arxiv.org/abs/0704.0653 , 202kb)
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arXiv:0704.0733
Date: Thu, 5 Apr 2007 14:32:22 GMT (57kb)

Title: Acceleration and localization of matter in a ring trap
Authors: Yu. V. Bludov, V. V. Konotop
Categories: cond-mat.other
\\
A toroidal trap combined with external time-dependent electric field can be
used for implementing different dynamical regimes of matter waves. In
particular, we show that dynamical and stochastic acceleration, localization
and implementation of the Kapitza pendulum can be originated by means of proper
choice of the external force.
\\ ( http://arxiv.org/abs/0704.0733 , 57kb)
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arXiv:0704.0769
Date: Thu, 5 Apr 2007 17:54:43 GMT (14kb)

Title: The Fermionic Density-functional at Feshbach Resonance
Authors: Michael Seidl and Rajat K. Bhaduri
Categories: cond-mat.other
Comments: Five pages, one table. accepted for publication in PRA
\\
We consider a dilute gas of neutral unpolarized fermionic atoms at zero
temperature.The atoms interact via a short range (tunable) attractive
interaction. We demonstrate analytically a curious property of the gas at
unitarity. Namely, the correlation energy of the gas, evaluated by second order
perturbation theory, has the same density dependence as the first order
exchange energy, and the two almost exactly cancel each other at Feshbach
resonance irrespective of the shape of the potential, provided $(\mu r_s) >> 1$. Here $(\mu)^{-1}$ is the range of the two-body potential, and $r_s$ is
defined through the number density $n=3/(4\pi r_s^3)$. The implications of this
result for universality is discussed.
\\ ( http://arxiv.org/abs/0704.0769 , 14kb)
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arXiv:0704.0763
Date: Thu, 5 Apr 2007 16:52:03 GMT (277kb)

Title: Coherent control of atomic tunneling
Authors: John Martin and Daniel Braun
Categories: quant-ph
Comments: 4 pages revtex, 3 figures
\\
We study the tunneling of a two-level atom in a double-well potential while
the atom is coupled to a single electro--magnetic field mode of a cavity. The
coupling between internal and external degrees of freedom, due to the
mechanical effect on the atom from photon emission into the cavity mode, can
dramatically change the tunneling behavior. We predict that in general the
tunneling process becomes quasiperiodic. In a certain regime of parameters a
collapse and revival of the tunneling occurs. Accessing the internal degrees of
freedom of the atom with a laser allows to coherently manipulate the atom
position, and in particular to prepare the atom in one of the two wells. The
effects described should be observable with a cesium atom in an optical
double-well trap.
\\ ( http://arxiv.org/abs/0704.0763 , 277kb)
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The replacements:

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Paper: cond-mat/0702034
replaced with revised version Fri, 30 Mar 2007 15:45:16 GMT (259kb)

Title: Species-specific optical lattices
Authors: L. J. LeBlanc and J. H. Thywissen
Categories: cond-mat.stat-mech
accepted for publication in Phys. Rev. A
Subj-class: Statistical Mechanics
\\ ( http://arXiv.org/abs/cond-mat/0702034 , 259kb)
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Paper: cond-mat/0703506
replaced with revised version Fri, 30 Mar 2007 06:32:50 GMT (168kb)

Title: Mott phases and quantum phase transitions of extended Bose-Hubbard
models in 2+1 dimensions
Authors: K. Sengupta
Categories: cond-mat.str-el cond-mat.stat-mech
Comments: Mini review; conference proceeeding for STATPHYS - KOLKATA V; to be
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
\\ ( http://arXiv.org/abs/cond-mat/0703506 , 168kb)
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Paper: cond-mat/0703788
replaced with revised version Fri, 30 Mar 2007 02:50:56 GMT (234kb)

Title: Classical simulation of infinite-size quantum lattice systems in two
spatial dimensions
Authors: J. Jordan, R. Orus, G. Vidal, F. Verstraete, J. I. Cirac
Categories: cond-mat.str-el cond-mat.stat-mech
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
\\ ( http://arXiv.org/abs/cond-mat/0703788 , 234kb)
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arXiv:cond-mat/0701364
replaced with revised version Sun, 1 Apr 2007 07:41:40 GMT (248kb)

Title: Localization of a Bose Einstein condensate in an optical superlattice
Authors: Aranya B Bhattacherjee
Categories: cond-mat.stat-mech
\\ ( http://arXiv.org/abs/cond-mat/0701364 , 248kb)
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arXiv:cond-mat/0702094
replaced with revised version Sat, 31 Mar 2007 11:42:16 GMT (114kb)

Title: Collective Modes and Stability of Bose-Fermi Mixtures with a BCS-BEC
Crossover
Authors: Hiroyuki Shibata, Nobuhiko Yokoshi, Susumu Kurihara
Categories: cond-mat.other cond-mat.supr-con
\\ ( http://arXiv.org/abs/cond-mat/0702094 , 114kb)
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arXiv:cond-mat/0703805
replaced with revised version Sat, 31 Mar 2007 07:41:42 GMT (49kb)

Title: Multicomponent Bright Solitons in F = 2 Spinor Bose-Einstein Condensates
Authors: Masaru Uchiyama, Jun'ichi Ieda, Miki Wadati
Categories: cond-mat.other
\\ ( http://arXiv.org/abs/cond-mat/0703805 , 49kb)
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arXiv:cond-mat/0612613
replaced with revised version Tue, 3 Apr 2007 11:45:39 GMT (304kb)

Title: Basic theory tools for degenerate Fermi gases
Authors: Yvan Castin (LKB - Lhomond)
Categories: cond-mat.other
Comments: 60 pages, Proceedings of the Enrico Fermi Varenna School on Fermi
gases (2006), a few typos corrected
\\ ( http://arxiv.org/abs/cond-mat/0612613 , 304kb)
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arXiv:cond-mat/0702066
replaced with revised version Tue, 3 Apr 2007 15:23:06 GMT (835kb)

Title: Pairing without Superfluidity: The Ground State of an Imbalanced Fermi
Mixture
Authors: C. H. Schunck, Y. Shin, A. Schirotzek, M. W. Zwierlein, W. Ketterle
Categories: cond-mat.str-el
\\ ( http://arxiv.org/abs/cond-mat/0702066 , 835kb)
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arXiv:cond-mat/0605184
replaced with revised version Wed, 4 Apr 2007 15:45:17 GMT (852kb)

Title: Preparation of a quantum state with one molecule at each site of an
optical lattice
Authors: T. Volz, N. Syassen, D. M. Bauer, E. Hansis, S. D\"urr, G. Rempe
Categories: cond-mat.stat-mech
Journal-ref: Nature Phys. 2, 692 (2006)
DOI: 10.1038/nphys415
\\ ( http://arxiv.org/abs/cond-mat/0605184 , 852kb)
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arXiv:quant-ph/0611005
replaced with revised version Wed, 4 Apr 2007 01:40:53 GMT (388kb)

Title: Properties of a coupled two species atom-heteronuclear molecule
condensate
Authors: Lu Zhou, Weiping Zhang, Hong Y. Ling, Lei Jiang and Han Pu
Categories: quant-ph cond-mat.mes-hall
Journal-ref: Phys. Rev. A 75, 043603 (2007)
DOI: 10.1103/PhysRevA.75.043603
\\ ( http://arxiv.org/abs/quant-ph/0611005 , 388kb)
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arXiv:quant-ph/0611005
replaced with revised version Wed, 4 Apr 2007 01:40:53 GMT (388kb)

Title: Properties of a coupled two species atom-heteronuclear molecule
condensate
Authors: Lu Zhou, Weiping Zhang, Hong Y. Ling, Lei Jiang and Han Pu
Categories: quant-ph cond-mat.mes-hall
Journal-ref: Phys. Rev. A 75, 043603 (2007)
DOI: 10.1103/PhysRevA.75.043603
\\ ( http://arxiv.org/abs/quant-ph/0611005 , 388kb)
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\\
arXiv:0704.0641
replaced with revised version Wed, 4 Apr 2007 20:14:02 GMT (215kb)

Title: Quantum engineering of photon states with entangled atomic ensembles
Authors: D. Porras, J.I. Cirac
Categories: quant-ph
\\ ( http://arxiv.org/abs/0704.0641 , 215kb)
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\\
arXiv:physics/0610210
replaced with revised version Thu, 5 Apr 2007 09:34:20 GMT (27kb)

Title: Feshbach resonances in ultracold atomic and molecular collisions:
threshold behaviour and suppression of poles in scattering lengths
Authors: Jeremy M. Hutson
Categories: physics.atom-ph physics.chem-ph
Comments: 10 pages, 2 figures. Version 4 has slightly revised content to
reflect the realisation that the resonant scattering length a_res can be
complex, which will sometimes produce a reduction in inealastic scattering
near a resonance
\\ ( http://arxiv.org/abs/physics/0610210 , 27kb)
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Till next week,
Matt.

--
=========================================================================
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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Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org
http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/
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Received on Tue Apr 10 2007 - 11:09:49 EST

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