Matt's arXiv selection bumper holiday edition: fortnight ending 29th December 2006.

From: Matthew Davis <>
Date: Tue, 2 Jan 2007 16:12:24 +1000 (EST)

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

Hi everyone,

I had some time off in the last week and so didn't get to the weekly email. To
make up for it, today's email contains two weeks worth of abstracts for your
reading pleasure. A total of 36 new abstracts:

Paper: cond-mat/0612376
Date: Thu, 14 Dec 2006 21:14:41 GMT (59kb)

Title: Expansion of a mesoscopic Fermi system from a harmonic trap
Authors: Pavel Nagornykh and Victor Galitski
Categories: cond-mat.mes-hall cond-mat.supr-con
Comments: 4 pages, 1 color figure
Subj-class: Mesoscopic Systems and Quantum Hall Effect; Superconductivity
   We study quantum dynamics of an atomic Fermi system with a finite number of
particles, N, after it is released from a harmonic trapping potential. We
consider two different initial states: The Fermi sea state and the paired state
described by the projection of the grand-canonical BCS wave function to the
subspace with a fixed number of particles. In the former case, we derive exact
and simple analytic expressions for the dynamics of particle density and
density-density correlation functions, taking into account the level
quantization and possible anisotropy of the trap. In the latter case of a
paired state, we obtain analytic expressions for the density and its
correlators in the leading order with respect to the ratio of the trap
frequency and the superconducting gap (the ratio assumed small). We discuss
several dynamic features, such as time evolution of the peak due to pair
correlations, which may be used to distinguish between the Fermi sea and the
paired state.
\\ ( , 59kb)
Paper: cond-mat/0612388
Date: Fri, 15 Dec 2006 10:22:45 GMT (19kb)

Title: BEC in a star-comb graph
Authors: F. P. Mancini, P. Sodano and A. Trombettoni
Categories: cond-mat.stat-mech
Comments: Proceedings of the "Eleventh Training Course in the Physics of
   Correlated Electron Systems and High-Tc Superconductors", Vietri sul Mare,
   Italy, Oct 2006
Subj-class: Statistical Mechanics
   We investigate the properties of free bosons hopping on a star-comb network,
discussing the single-particle spectrum and the main thermodynamic equilibrium
properties: Bose-Einstein critical temperature, fraction of condensate, and
spatial boson distribution. We find an enhancement of the critical temperature
with respect to other inhomogeneous networks.
\\ ( , 19kb)
Paper: quant-ph/0612128
Date: Fri, 15 Dec 2006 09:54:06 GMT (83kb)

Title: Entangling two atoms in spatially separated cavities through both photon
   emission and absorption processes
Authors: Peng Peng, Fu-li Li
Comments: 12 pages, 4 figures
   We consider a system consisting of a $\Lambda$-type atom and a V-type atom,
which are individually trapped in two spatially separated cavities that are
connected by an optical fibre. We show that an extremely entangled state of the
two atoms can be deterministically generated through both photon emission of
the $\Lambda$-type atom and photon absorption of the V-type atom in an ideal
situation. The influence of various decoherence processes such as spontaneous
emission and photon loss on the fidelity of the entangled state is also
investigated. We find that the effect of photon leakage out of the fibre on the
fidelity can be greatly diminished in some special cases. As regards the effect
of spontaneous emission and photon loss from the cavities, we find that the
present scheme with a fidelity higher than 0.98 may be realized under current
experiment conditions.
\\ ( , 83kb)
Paper: quant-ph/0612129
Date: Fri, 15 Dec 2006 11:09:36 GMT (111kb)

Title: Two-photon states generated from a continuous wave source
Authors: Anne E. B. Nielsen and Klaus Molmer
Categories: quant-ph
Comments: 10 pages, 9 figures
   Conditional preparation of two-photon states from a continuous wave
non-degenerate optical parametric oscillator is investigated. We derive the
phase space Wigner function for the output state conditioned on two nearby
photo detection events, and we maximize its overlap with a two-photon state by
varying the temporal output state mode function. In the low intensity limit, we
generalize to n-photon state production. We find a simple expression for the
conditional output, and from this we determine the optimal output state mode
function and n-photon state fidelity.
\\ ( , 111kb)
Paper: cond-mat/0612415
Date: Fri, 15 Dec 2006 21:00:07 GMT (513kb)

Title: Hard-core bosons on optical superlattices: Dynamics and relaxation in
   the superfluid and insulating regimes
Authors: Marcos Rigol, Alejandro Muramatsu, Maxim Olshanii
Categories: cond-mat.other cond-mat.stat-mech
Comments: 14 pages, 17 figures, published version
Subj-class: Other; Statistical Mechanics
Journal-ref: Phys. Rev. A 74, 053616 (2006)
DOI: 10.1103/PhysRevA.74.053616
   We study the ground-state properties and nonequilibrium dynamics of hard-core
bosons confined in one-dimensional lattices in the presence of an additional
periodic potential (superlattice) and a harmonic trap. The dynamics is analyzed
after a sudden switch-on or switch-off of the superlattice potential, which can
bring the system into insulating or superfluid phases, respectively. A collapse
and revival of the zero-momentum peak can be seen in the first case. We study
in detail the relaxation of these integrable systems towards equilibrium. We
show how after relaxation time averages of physical observables, like the
momentum distribution function, can be predicted by means of a generalization
of the Gibbs distribution.
\\ ( , 513kb)
Paper: cond-mat/0612417
Date: Mon, 18 Dec 2006 18:32:59 GMT (17kb)

Title: Dimer states in atomic mixtures
Authors: K. Ziegler
Categories: cond-mat.stat-mech
Comments: 4 pages, 1 figure
Subj-class: Statistical Mechanics
   A mixture of heavy atoms in a Mott state and light spin-1/2 fermionic atoms
is studied in an optical lattice. Scattering processes excite the heavy atoms
and generate an attraction between the light atoms. An effective Hamiltonian is
derived that describes tunneling of single fermions, tunneling of fermionic
pairs and an exchange of fermionic spins. An eigenstate of the last two
processes is found in form of an alternating dimer state. This state has a
global symmetry with respect to a discrete rotation of all dimers. Fluctuations
due to rotations of dimer clusters may lead to a transition to a dimer liquid
in frustrated optical lattices.
\\ ( , 17kb)
Paper: cond-mat/0612436
Date: Sun, 17 Dec 2006 09:03:36 GMT (15kb)

Title: Complex Envelope Soliton in Bose-Einstein Condensate with Time Dependent
   Scattering Length
Authors: Ayan Khan, Rajneesh Atre and Prasanta K. Panigrahi
Categories: cond-mat.other
Comments: 3 pages, 2 eps figures, To appear in the proceedings of Condensed
   Matter Days - 2006
Subj-class: Other
   We elaborate on a general method to find complex envelope solitons in a cigar
shaped Bose-Einstein condensate in a trap. The procedure incorporates time
dependent scattering length, oscillator frequency and loss/gain. A variety of
time dependencies of the above parameters, akin to the ones occurring in the
experiments can be tackled.
\\ ( , 15kb)
Paper: cond-mat/0612460
Date: Mon, 18 Dec 2006 16:20:44 GMT (24kb)

Title: Shear viscosity and damping for a Fermi gas in the unitarity limit
Authors: G. M. Bruun, H. Smith
Categories: cond-mat.stat-mech
Comments: 4 pages, 3 figures
Subj-class: Statistical Mechanics
   We calculate the shear viscosity of a two-component Fermi gas in the normal
phase as a universal function of temperature in the unitarity limit. Using a
microscopic Kubo approach, the importance of strong-coupling effects such as
the emergence of the pseudogap is examined. We demonstrate how recent
experimental results on the damping of collective modes in the unitarity limit
can be understood in terms of viscous damping when the gas is in the
collisional hydrodynamic regime.
\\ ( , 24kb)
Paper: cond-mat/0612464
Date: Mon, 18 Dec 2006 18:08:32 GMT (12kb)

Title: Two-body correlations and the superfluid fraction for nonuniform systems
Authors: Wayne M. Saslow, Davide E. Galli, and Luciano Reatto
Categories: cond-mat.stat-mech
Comments: 13 pages
Subj-class: Statistical Mechanics
   We extend the one-body phase function upper bound on the superfluid fraction
in a periodic solid (a spatially ordered supersolid) to include two-body phase
correlations. The one-body current density is no longer proportional to the
gradient of the one-body phase times the one-body density, but rather it
depends also on two-body correlation functions. The equations that
simultaneously determine the one-body and two-body phase functions require a
knowledge of one-, two-, and three-body correlation functions. The approach can
also be extended to disordered solids. Fluids, with two-body densities and
two-body phase functions that are translationally invariant, cannot take
advantage of this additional degree of freedom to lower their energy.
\\ ( , 12kb)
Paper: cond-mat/0612465
Date: Mon, 18 Dec 2006 19:41:04 GMT (133kb)

Title: Reconstruction of the finite size canonical ensemble from incomplete
   micro-canonical data
Authors: P. H. Lundow, K. Markstr\"om
Categories: cond-mat.stat-mech
Comments: 19 pages
Subj-class: Statistical Mechanics
   In this paper we discuss how partial knowledge of the density of states for a
model can be used to give good approximations of the energy distributions in a
given temperature range. From these distributions one can then obtain the
statistical moments corresponding to eg the internal energy and the specific
heat. These questions have gained interest apropos of several recent methods
for estimating the density of states of spin models. As a worked example we
finally apply these methods to the 3-state Potts model for cubic lattices of
linear order up to 128. We give estimates of eg latent heat and critical
temperature, as well as the microcanonical properties of interest.
\\ ( , 133kb)
Paper: quant-ph/0612138
Date: Sat, 16 Dec 2006 03:38:17 GMT (362kb)

Title: An ultrahigh Finesse Fabry-Perot superconducting resonator as a photon
   box for cavity-QED experiments
Authors: Stefan Kuhr, S\'{e}bastien Gleyzes (LKB - Lhomond), Christine Guerlin
   (LKB - Lhomond), Julien Bernu (LKB - Lhomond), Ulrich Busk Hoff (LKB -
   Lhomond), Samuel Del\'{e}glise (LKB - Lhomond), Michel Brune (LKB - Lhomond),
   Jean-Michel Raimond (LKB - Lhomond), Serge Haroche (LKB - Lhomond), Stefano
   Osnaghi (LKB - Lhomond), E. Jacques (DAPNIA), P. Bosland (DAPNIA), B.
   Visentin (DAPNIA)
Categories: quant-ph
Proxy: ccsd hal-00120654
   We have built a microwave Fabry-Perot resonator made of diamond-machined
copper mirrors coated with superconducting niobium. Its damping time (Tc = 130
ms at 51 GHz and 0.8 K) corresponds to a finesse of 4.6 e9, the highest ever
reached for a Fabry-Perot in any frequency range. We have tested this resonator
by sending across it two circular Rydberg atoms, the first emitting a photon
and the second absorbing it after a delay of 1/10 s. This long storage time
photon box opens novel perspectives for quantum information. It can be used to
perform sequences of hundreds of gate operations on individual atomic qubits. A
set-up with one or two photon boxes can store mesoscopic fields made of
hundreds of photons for decoherence and non-locality studies.
\\ ( , 362kb)
Paper: physics/0612163
Date: Sat, 16 Dec 2006 12:36:49 GMT (501kb)

Title: A supersonic beam of cold lithium hydride molecules
Authors: S. K. Tokunaga, J. O. Stack, J. J. Hudson, B. E. Sauer, E. A. Hinds
   and M. R. Tarbutt
Categories: physics.atom-ph
Comments: 8 pages, 6 figures
Subj-class: Atomic Physics
   We have developed a source of cold LiH molecules for Stark deceleration and
trapping experiments. Lithium metal is ablated from a solid target into a
supersonically expanding carrier gas. The translational, rotational and
vibrational temperatures are 0.9(0.1) K, 5.9(0.5) K and 468(17) K respectively.
Although they have not reached thermal equilibrium with the carrier gas, we
estimate that 90% of the LiH molecules are in the ground state, X^{1}
\Sigma^{+} (v=0, J=0). With a single 7 ns ablation pulse, the number of
molecules in the ground state is 4.5(1.8)*10^{7} molecules per steradian. A
second, delayed, ablation pulse produces another LiH beam in a different part
of the same gas pulse, thereby almost doubling the signal. A long pulse,
lasting 150 microseconds, can make the beam up to 15 times more intense.
\\ ( , 501kb)
Paper: physics/0612162
Date: Sat, 16 Dec 2006 11:36:27 GMT (166kb)

Title: Tasting edge effects
Authors: Lyderic Bocquet
Categories: physics.ed-ph physics.gen-ph
Comments: to appear in American Journal of Physics
Subj-class: Physics Education; General Physics
   We show that the baking of potato wedges constitutes a crunchy example of
edge effects, which are usually demonstrated in electrostatics. A simple model
of the diffusive transport of water vapor around the potato wedges shows that
the water vapor flux diverges at the sharp edges in analogy with its
electrostatic counterpart. This increased evaporation at the edges leads to the
crispy taste of these parts of the potatoes.
\\ ( , 166kb)
Paper: cond-mat/0612479
Date: Tue, 19 Dec 2006 10:30:46 GMT (116kb)

Title: Fractional Quantum Hall States in Fast Rotating Bose Gases
Authors: A. Lakhoua, T. Masson, J.C. Wallet
Categories: cond-mat.mes-hall
Subj-class: Mesoscopic Systems and Quantum Hall Effect
   We use a Chern Simons Landau-Ginzburg (CSLG) framework related to hierarchies
of composite bosons to describe 2D harmonically trapped fast rotating Bose
gases in Fractional Quantum Hall Effect (FQHE) states. The predicted values for
$\nu$ (ratio of particle to vortex numbers) are $\nu$$=$${{p}\over{q}}$ ($p$,
$q$ are any integers) with even product $pq$, including numerically favored
values previously found and predicting a richer set of values. We show that
those values can be understood from a bosonic analog of the law of the
corresponding states relevant to the electronic FQHE. A tentative global phase
diagram for the bosonic system for $\nu$$<$1 is also proposed.
\\ ( , 116kb)
Paper: cond-mat/0612496
Date: Tue, 19 Dec 2006 18:10:49 GMT (42kb)

Title: Imbalanced Fermi-Fermi mixtures in optical lattices
Authors: M. Iskin and C. A. R. Sa de Melo
Categories: cond-mat.supr-con cond-mat.other
Comments: 4 pages with 3 figures
Subj-class: Superconductivity; Other
   The ground state phase diagram of imbalanced Fermi-Fermi mixtures in optical
lattices is analyzed as a function of interaction strength, population
imbalance, filling fraction and tunneling parameters. It is shown that
population imbalanced Fermi-Fermi mixtures reduce to strongly interacting
Bose-Fermi mixtures in the molecular limit, in sharp contrast with homogenous
systems where the resulting Bose-Fermi mixture is weakly interacting.
Furthermore, insulating phases are found in optical lattices of Fermi-Fermi
mixtures in addition to the standard phase-separated or coexisting
superfluid/excess-fermion phases found in homogeneous systems. The insulating
states can be a molecular Bose-Mott insulator (BMI), a Fermi-Pauli insulator
(FPI), phase-separated BMI/FPI mixture or a Bose-Fermi checkerboard (BFC).
\\ ( , 42kb)
Paper: cond-mat/0612498
Date: Tue, 19 Dec 2006 18:53:06 GMT (101kb)

Title: Metastable states of a gas of dipolar bosons in a 2D optical lattice
Authors: C. Menotti, C. Trefzger, and M.Lewenstein
Categories: cond-mat.other cond-mat.dis-nn
Comments: 4 pages, 4 figures
Subj-class: Other; Disordered Systems and Neural Networks
   We investigate the physics of dipolar bosons in a two dimensional optical
lattice. It is known that due to the long-range character of dipole-dipole
interaction, the ground state phase diagram of a gas of dipolar bosons in an
optical lattice presents novel quantum phases, like checkerboard and supersolid
phases. In this paper, we consider the properties of the system beyond its
ground state, finding that it is characterised by a multitude of almost
degenerate metastable states, often competing with the ground state. This makes
dipolar bosons in a lattice similar to a disordered system and opens
possibilities of using them for quantum memories.
\\ ( , 101kb)
Paper: cond-mat/0612499
Date: Tue, 19 Dec 2006 18:34:06 GMT (254kb)

Title: What makes a crystal supersolid ?
Authors: Nikolay Prokof'ev
Categories: cond-mat.dis-nn cond-mat.stat-mech
Comments: Perspective to appear in Advances in Physics, 25 pages, 7 figures
Subj-class: Disordered Systems and Neural Networks; Statistical Mechanics
   For nearly half a century the supersolid phase of matter has remained
mysterious, not only eluding experimental observation, but also generating a
great deal of controversy among theorists. Recent discovery of what is
interpreted as a non-classical moment of inertia at low temperature in solid
He-4 has elicited much excitement as a possible first observation of a
supersolid phase. In the two years following the discovery, however, more
puzzles than answers have been provided to the fundamental issue of whether the
supersolid phase exists, in helium or any other naturally occurring condensed
matter system. Presently, there is no established theoretical framework to
understand the body of experimental data on He-4. Different microscopic
mechanisms that have been suggested to underlie superfluidity in a perfect
quantum crystal do not seem viable for \he4, for which a wealth of experimental
and theoretical evidence points to an insulating crystalline ground state. This
perspective addresses some of the outstanding problems with the interpretation
of recent experimental observations of the apparent superfluid response in He-4
(seen now by several groups) and discusses various scenarios alternative to the
homogeneous supersolid phase, such as superfluidity induced by extended defects
of the crystalline structure which include grain boundaries, dislocations,
anisotropic stresses, etc. Can a metastable superfluid "glassy" phase exist,
and can it be relevant to some of the experimental observations ? One of the
most interesting and unsolved fundamental questions is what interatomic
potentials, given the freedom to design one, can support an ideal supersolid
phase in continuous space, and can they be found in Nature.
\\ ( , 254kb)
Paper: physics/0612182
Date: Tue, 19 Dec 2006 09:38:53 GMT (239kb)

Title: Dimension of holes and high-temperature condensate in Bose--Einstein
Authors: V. P. Maslov
Categories: physics.gen-ph
Comments: 14 pages, 3 figures
Subj-class: General Physics
   We introduce the notion of weight for the lattice dimension and the notion of
topological dimension -- hole dimension. The condensate in Bose-holes exists in
the case when temperature in not low.
\\ ( , 239kb)
Paper: cond-mat/0612505
Date: Tue, 19 Dec 2006 22:13:17 GMT (921kb)

Title: Supersolidity is Dirty
Authors: Jiansheng Wu and Philip Phillips
Categories: cond-mat.dis-nn cond-mat.supr-con
Comments: 4 pages, 2 .eps figures
Subj-class: Disordered Systems and Neural Networks; Superconductivity
   A microscopic model for the supersolid phase in $^4$He is given. On a grain
boundary, atom motion is well described by a disordered Bose-Hubbard model. We
argue that the clean system is a commensurate Mott insulator but in the
presence of disorder, a supersolid state obtains. At work is the
disorder-induced closing of the Mott gap. We find that the transition
temperature to the supersolid state is an increasing function of disorder as is
seen experimentally. We also find that a glassy phase mediated by disorder
possesses a period shift, though it lacks superflow. This latter observation is
relevant to solid hydrogen in which a period shift is observed without
\\ ( , 921kb)
Paper: cond-mat/0612508
Date: Wed, 20 Dec 2006 01:59:34 GMT (257kb)

Title: Using modified Gaussian distribution to study the physical properties of
   one and two-component ultracold atoms
Authors: C. C. Huang and W. C. Wu
Categories: cond-mat.other cond-mat.stat-mech
Comments: 7 pages, 7 figures, accepted for publication in Phys. Rev. A
Subj-class: Other; Statistical Mechanics
   Gaussian distribution is commonly used as a good approximation to study the
trapped one-component Bose-condensed atoms with relatively small nonlinear
effect. It is not adequate in dealing with the one-component system of large
nonlinear effect, nor the two-component system where phase separation exists.
We propose a modified Gaussian distribution which is more effective when
dealing with the one-component system with relatively large nonlinear terms as
well as the two-component system. The modified Gaussian is also used to study
the breathing modes of the two-component system, which shows a drastic change
in the mode dispersion at the occurrence of the phase separation. The results
obtained are in agreement with other numerical results.
\\ ( , 257kb)
Paper: cond-mat/0612522
Date: Wed, 20 Dec 2006 13:03:54 GMT (24kb)

Title: Mott-insulator phases of non-locally coupled 1D dipolar Bose gases
Authors: A. Arguelles and L. Santos
Categories: cond-mat.other
Comments: 4 pages, 4 eps figures
Subj-class: Other
   We analyze the Mott-insulator phases of dipolar bosonic gases placed in
neighboring but unconnected 1D traps. Whereas for short-range interactions the
1D systems are independent, the non-local dipole-dipole interaction induces a
direct Mott-insulator to pair-superfluid transition which significantly
modifies the boundaries of the lowest Mott-insulator phases. The lowest
boundary of the lowest Mott regions becomes progressively constant as a
function of the hopping rate, eventually inverting its slope, leading to a
re-entrant configuration which is retained in 2D. We discuss the consequences
of this effect on the spatial Mott-insulator plateaux in experiments with
additional harmonic confinement, showing that anti-intuitively the plateaux may
become wider for increasing hopping. Our results are also applicable to
non-dipolar boson-boson mixtures.
\\ ( , 24kb)
Paper: cond-mat/0612524
Date: Wed, 20 Dec 2006 13:24:00 GMT (70kb)

Title: Confinement effects on the stimulated dissociation of molecular BECs
Authors: I. Tikhonenkov and A. Vardi
Categories: cond-mat.other
Comments: 4 pages, 4 figures
Subj-class: Other
   We show that a molecular BEC in a trap is stabilized against stimulated
dissociation if the trap size is smaller than the resonance healing length
$(\hbar^2/2mg\sqrt{n})^{1/2}$. The condensate shape determines the critical
atom-molecule coupling frequency. We discuss an experiment for triggering
dissociation by a sudden change of coupling or trap parameters. This effect
demonstrates one of the unique collective features of 'superchemistry' in that
the yield of a chemical reaction depends critically on the size and shape of
the reaction vessel.
\\ ( , 70kb)
Paper (*cross-listing*): nucl-th/0612086
Date: Tue, 19 Dec 2006 14:43:10 GMT (141kb)

Title: Effective Field Theory for Dilute Fermions with Pairing
Authors: R.J. Furnstahl, H.-W. Hammer, S.J. Puglia
Categories: cond-mat.supr-con
Comments: 31 pages, 10 figures
Report-no: HISKP-TH-06-40
Subj-class: Nuclear Theory; Superconductivity
   Effective field theory (EFT) methods for a uniform system of fermions with
short-range, natural interactions are extended to include pairing correlations,
as part of a program to develop a systematic Kohn-Sham density functional
theory (DFT) for medium and heavy nuclei. An effective action formalism for
local composite operators leads to a free-energy functional that includes
pairing by applying an inversion method order-by-order in the EFT expansion. A
consistent renormalization scheme is demonstrated for the uniform system
through next-to-leading order, which includes induced-interaction corrections
to pairing.
\\ ( , 141kb)
Paper: cond-mat/0612544
Date: Thu, 21 Dec 2006 12:14:42 GMT (166kb)

Title: Ground states of hard-core bosons in one dimensional periodic potentials
Authors: Yuan Lin and Biao Wu
Categories: cond-mat.other
Comments: 5 pages, 5 figures
Subj-class: Other
   With Girardeau's Fermi-Bose mapping, we find the exact ground states of
hard-core bosons residing in a one dimensional periodic potential. The analysis
of these ground states shows that when the number of bosons $N$ is commensurate
with the number of wells $M$ in the periodic potential, the boson system is a
Mott insulator whose energy gap, however, is given by the single-particle band
gap of the periodic potential; when $N$ is not commensurate with $M$, the
system is a metal (not a superfluid). The Kronig-Penney potential is used to
illustrate our results.
\\ ( , 166kb)
Paper: cond-mat/0612565
Date: Thu, 21 Dec 2006 19:11:01 GMT (155kb)

Title: Novel quantum phases of dipolar Bose gases in optical lattices
Authors: S. Yi, T. Li, C. P. Sun
Categories: cond-mat.other
Comments: 4 pages, 4 figures
Subj-class: Other
   We investigate the quantum phases of dipolar Bose gases loaded into a two
dimension square and three dimension cubic optical lattices. We show that the
long-range and anisotropic nature of the dipole-dipole interaction induces a
rich variety of quantum phases, including the supersolid and striped supersolid
phases in 2D lattices, and the layered supersolid phase in 3D lattices.
\\ ( , 155kb)
Paper: quant-ph/0612180
Date: Thu, 21 Dec 2006 15:10:30 GMT (891kb)

Title: Designing spin-1 lattice models using polar molecules
Authors: Gavin K. Brennen, Andrea Micheli, and Peter Zoller
Comments: 24 pages, 5 figures
   We describe how to design a large class of always on spin-1 interactions
between polar molecules trapped in an optical lattice. The spin degrees of
freedom correspond to the hyperfine levels of a ro-vibrational ground state
molecule. Interactions are induced using a microwave field to mix ground states
in one hyperfine manifold with the spin entangled dipole-dipole coupled excited
states. Using multiple fields anistropic models in one, two, or three
dimensions, can be built with tunable spatial range. An illustrative example in
one dimension is the generalized Haldane model, which at a specific parameter
has a gapped valence bond solid ground state. The interaction strengths are
large compared to decoherence rates and should allow for probing the rich phase
structure of strongly correlated systems, including dimerized and gapped
\\ ( , 891kb)
Paper: cond-mat/0612567
Date: Thu, 21 Dec 2006 21:53:20 GMT (50kb)

Title: Sound propagation in a Fermi gas near a Feshbach resonance
Authors: J. Joseph, B. Clancy, L. Luo, J. Kinast, A. Turlapov, and J. E. Thomas
Categories: cond-mat.other
Comments: 4 pages, 5 figures
Subj-class: Other
   Sound waves are observed and studied in an optically trapped degenerate Fermi
gas of spin-up and spin-down atoms with magnetically tunable interactions.
Measurements are made throughout the crossover region, from a
weakly-interacting Fermi gas through the resonant Fermi superfluid regime to a
Bose condensate of dimer molecules. The measured sound velocities test the
equation of state and confirm the universal hypothesis.
\\ ( , 50kb)
Paper: cond-mat/0612572
Date: Fri, 22 Dec 2006 15:10:02 GMT (31kb)

Title: Stable and unstable regimes in Bose-Fermi mixture with attraction
   between components
Authors: A.M. Belemuk, S.-T. Chui, V. N. Ryzhov
Categories: cond-mat.stat-mech cond-mat.dis-nn
Comments: 7 pages, 5 figures
Subj-class: Statistical Mechanics; Disordered Systems and Neural Networks
   A collapse of the trapped boson- fermion mixture with the attraction between
bosons and fermions is investigated in the framework of the effective
Hamiltonian for the Bose system. The properties of the $^{87}$Rb and $^{40}$K
mixture are analyzed quantitatively at $T= 0$. We find numerically solutions of
modified Gross- Pitaevskii equation which continuously go from stable to
unstable branch. We discuss the relation of the onset of collapse with
macroscopic properties of the system. A comparison with the case of a Bose
condensate of atomic $^7Li$ system is given.
\\ ( , 31kb)
Paper: cond-mat/0612590
Date: Fri, 22 Dec 2006 14:45:11 GMT (103kb)

Title: Ground-State Fidelity and Bipartite Entanglement in the Bose-Hubbard
Authors: Pierfrancesco Buonsante and Alessandro Vezzani
Categories: cond-mat.other
Comments: 7 pages, 5 figures (endfloats used due to problems with figures and
   latex. Sorry about that)
Subj-class: Other
   We analyze the quantum phase transition in the Bose-Hubbard model borrowing
two tools from Quantum Information Theory, i.e. the ground-state fidelity and
entanglement measures. We consider systems at unitary filling comprising up to
50 sites and show for the first time that a finite-size scaling analysis in
terms of these quantities provides excellent estimates for the quantum critical
   We conclude that fidelity is particularly suited for revealing a quantum
phase transition and pinning down the critical point thereof, while
entanglement measures give a deeper insight into the mechanisms governing the
\\ ( , 103kb)
Paper: cond-mat/0612592
Date: Fri, 22 Dec 2006 15:36:10 GMT (36kb)

Title: Wigner Crystallization in Fast Rotating 2D Dipolar Fermi Gases
Authors: M.A. Baranov, H. Fehrmann, and M. Lewenstein
Categories: cond-mat.mes-hall
Comments: 4 pages, 3 figures
Subj-class: Mesoscopic Systems and Quantum Hall Effect
   We study the competition between the Wigner crystal and the Laughlin liquid
states in an ultracold quasi two-dimensional rapidly rotating polarized dipolar
fermionic gas, and find that below a critical filling factor, the Wigner
crystal has a lower energy. We examine the corresponding quantum crystal
melting transition for different confinements of the gas in the third
direction. Our analysis of the phonon spectra of the Wigner crystal with the
account of phonon-phonon interactions also shows the stability of the Wigner
crystal for sufficiently low filling factors (\nu <1/7).
\\ ( , 36kb)
Paper: cond-mat/0612601
Date: Fri, 22 Dec 2006 19:57:24 GMT (200kb)

Title: Universality Constraints on Three-Body Recombination for Cold Atoms:
   from 4He to 133Cs
Authors: Eric Braaten, Daekyoung Kang, Lucas Platter
Categories: cond-mat.other
Comments: 17 pages, 6 eps figures
Subj-class: Other
   For atoms with large scattering length, the dependence of the 3-body
recombination rate on the collision energy is determined by the scattering
length and the Efimov 3-body parameters and can be expressed in terms of
universal functions of a single scaling variable. We use published results on
the 3-body recombination rate for 4He atoms to constrain the universal
functions. We then use those universal functions to calculate the 3-body
recombination rate for other atoms with large scattering length at nonzero
temperature. The constraints from the 4He results are strong if the scattering
length is near the minimum of the 3-body recombination rate at threshold. We
apply our results to 133Cs atoms with a large positive scattering length, and
compare them with experimental results from the Innsbruck group.
\\ ( , 200kb)
Paper: quant-ph/0612189
Date: Fri, 22 Dec 2006 01:45:04 GMT (329kb)

Title: Semiclassical limits to the linewidth of an atom laser
Authors: Mattias Johnsson, Simon Haine, Joseph Hope, Nick Robins, Cristina
   Figl, Matthew Jeppesen, Julien Dugu\'{e}, John Close
Categories: quant-ph
Comments: 9 Figures
   We investigate the linewidth of a quasi-continuous atom laser within a
semiclassical framework. In the high flux regime, the lasing mode can exhibit a
number of undesirable features such as density fluctuations. We show that the
output therefore has a complicated structure that can be somewhat simplified
using Raman outcoupling methods and energy-momentum selection rules. In the
weak outcoupling limit, we find that the linewidth of an atom laser is
instantaneously Fourier limited, but, due to the energy `chirp' associated with
the draining of a condensate, the long-term linewidth of an atom laser is
equivalent to the chemical potential of the condensate source. We show that
correctly sweeping the outcoupling frequency can recover the Fourier-limited
\\ ( , 329kb)
Paper: quant-ph/0612191
Date: Fri, 22 Dec 2006 03:21:43 GMT (50kb)

Title: Multimode quantum limits to the linewidth of an atom laser
Authors: Mattias T. Johnsson and Joseph J. Hope
Comments: 8 Figures
   The linewidth of an atom laser can be limited by excitation of higher energy
modes in the source Bose-Einstein condensate, energy shifts in that condensate
due to the atomic interactions, or phase diffusion of the lasing mode due to
those interactions. The first two are effects that can be described with a
semiclassical model, and have been studied in detail for both pumped and
unpumped atom lasers. The third is a purely quantum statistical effect, and has
been studied only in zero dimensional models. We examine an unpumped atom laser
in one dimension using a quantum field theory using stochastic methods based on
the truncated Wigner approach. This allows spatial and statistical effects to
be examined simultaneously, and the linewidth limit for unpumped atom lasers is
quantified in various limits.
\\ ( , 50kb)
Paper: quant-ph/0612200
Date: Fri, 22 Dec 2006 17:40:50 GMT (254kb)

Title: Coherent optical detection of highly excited Rydberg states using
   electromagnetically induced transparency
Authors: A. K. Mohapatra, T. R. Jackson, C. S. Adams
Categories: quant-ph
Comments: Submitted to Physical Review Letters
   We observe electromagnetically induced transparency (EIT) on the 5s to 5p
transition in a room temperature rubidium vapour cell by coupling the 5p state
to a Rydberg state (ns or nd with n=26 to 124). We demonstrate that the narrow
line-width of the EIT resonance (2 MHz) allows precise measurement of the d
state fine structure splitting, and together with the sensitivity of the
Rydberg state to electric fields, we are able to detect transient electric
fields produced by the dynamics of charges within the cell. Coherent coupling
of Rydberg states via EIT could also be used for cross-phase modulation and
photon entanglement.
\\ ( , 254kb)
Paper: cond-mat/0612613
Date: Sun, 24 Dec 2006 10:13:14 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)
Proxy: ccsd hal-00122049
Subj-class: Other
   This is an introductory lecture to the theory of degenerate Fermi gases, in
the context of present experiments on atomic Fermi gases. In part one, some
properties of the ideal Fermi gas are presented, including a discussion of the
fluctuations of the number of fermions in a given spatial zone in 1D, 2D and
3D. In part two, two-body aspects of the interaction potential are discussed
and several possible models for the interaction are analyzed, including the
two-channel model for the Feshbach resonance. In part three, basic predictions
of zero temperature BCS theory are presented, including a derivation of
superfluid hydrodynamic equations from time dependent BCS theory.
\\ ( , 304kb)
Paper: cond-mat/0612616
Date: Sun, 24 Dec 2006 16:52:04 GMT (65kb)

Title: Role of excited states in the splitting dynamics of interacting
   Bose-Einstein condensates when rumping-up a barrier
Authors: Alexej I. Streltsov, Ofir E. Alon and Lorenz S. Cederbaum
Categories: cond-mat.other
Comments: 11 pages, 3 figures
Subj-class: Other
   An essentially-exact approach to compute the wavefunction in the
time-dependent many-boson Schr\"odinger equation is derived and employed to
study accurately the process of splitting a trapped condensate when rumping-up
a barrier such that a double-well is formed. We follow the role played by
many-body excited states during the splitting process. Among others, a
'counter-intuitive' regime is found in which the evolution of the condensate
when the barrier is rumped-up sufficiently slow {\it is not} to the
ground-state which is a fragmented condensate, but to a low-lying excited-state
which is a coherent condensate. Experimental implications are discussed.
\\ ( , 65kb)
Paper: quant-ph/0612201
Date: Sun, 24 Dec 2006 00:10:55 GMT (267kb)

Title: Decoherence-induced geometric phase in a multilevel atomic system
Authors: Shubhrangshu Dasgupta and Daniel A. Lidar (USC)
Categories: quant-ph
Comments: 9 pages, 12 figures
   We consider the STIRAP process in a three-level atom. Viewed as a closed
system, no geometric phase is acquired. But in the presence of spontaneous
emission and/or collisional relaxation we show numerically that a
non-vanishing, purely real, geometric phase is acquired during STIRAP, whose
magnitude grows with the decay rates. Rather than viewing this
decoherence-induced geometric phase as a nuisance, it can be considered an
example of "beneficial decoherence": the environment provides a mechanism for
the generation of geometric phases which would otherwise require an extra
experimental control knob.
\\ ( , 267kb)
Paper: quant-ph/0612213
Date: Tue, 26 Dec 2006 21:42:12 GMT (889kb)

Title: Control of the geometric phase and pseudo-spin dynamics on coupled
   Bose-Einstein condensates
Authors: E.I. Duzzioni, L. Sanz, S.S. Mizrahi and M.H.Y. Moussa
Categories: quant-ph
Comments: 1 tex file and 11 figures in pdf format
   We describe the behavior of two coupled Bose-Einstein condensates in
time-dependent (TD) trap potentials and TD Rabi (or tunneling) frequency, using
the two-mode approach. Starting from Bloch states, we succeed to get analytical
solutions for the TD Schroedinger equation and present a detailed analysis of
the relative and geometric phases acquired by the wave function of the
condensates, as well as their population imbalance. We also establish a
connection between the geometric phases and constants of motion which
characterize the dynamic of the system. Besides analyzing the affects of
temporality on condensates that differs by hyperfine degrees of freedom
   (internal Josephson effect), we also do present a brief discussion of a one
specie condensate in a double-well potential
   (external Josephson effect).
\\ ( , 889kb)
Paper: quant-ph/0612214
Date: Wed, 27 Dec 2006 07:35:06 GMT (502kb)

Title: Controllable Majorana transition in spinor Bose-Einstein condensates
Authors: Lin Xia, Xu Xu, Fan Yang, Wei Xiong, Juntao Li, Qianli Ma, Xiaoji
   Zhou, Hong Guo and Xuzong Chen
Categories: quant-ph
Comments: 5 pages, 5 figures
   Controllable Majorana transition in spinor BEC system has been realized by
altering the rotation frequency of the magnetic fleld's direction. The
population of spinor states can be conveniently manipulated by adjusting the
turn-off time of the trap coils in experiment, which provides a new tool to
manipulate quantum states. Using the Majorana transition process on pulsed atom
laser, multicomponent spinor atom laser is generated. We demonstrate that the
experiment results are agreed with the theoretical predication.
\\ ( , 502kb)
Paper: physics/0612233
Date: Sat, 23 Dec 2006 21:26:24 GMT (86kb)

Title: Enhancement of Rydberg atom interactions using ac Stark shifts
Authors: P. Bohlouli-Zanjani, J. A. Petrus, J. D. D. Martin
Categories: physics.atom-ph
Subj-class: Atomic Physics
   The ac Stark effect was used to induce resonant energy transfer between
translationally cold Rydberg atoms. The Rb Rydberg atoms were obtained by laser
excitation of cold atoms from a magneto-optical trap. Using two-photon
microwave spectroscopy of the 49s_{1/2}-50s_{1/2} transition, the field
strength of a 28.5 GHz dressing field was calibrated. When this dressing field
was set at specific field strengths, the two-atom dipole-dipole process
43d_{5/2} + 43d_{5/2} -> 45p_{3/2} + 41f was dramatically enhanced, due to
induced degeneracy of the initial and final states. A series of observed
resonant field strengths correspond to different magnetic sublevel
possibilities for the initial and final states. These agree well with
calculated resonance fields based on a perturbative ac Stark shift formula.
This method for enhancing interactions is complementary to dc
electric-field-induced resonant energy transfer, but has more flexibility due
to the possibility of varying the applied frequency.
\\ ( , 86kb)
Paper: physics/0612235
Date: Sun, 24 Dec 2006 07:33:33 GMT (84kb)

Title: Rubidium lifetime in a dark magneto-optical trap
Authors: O.I.Permyakova, A.V.Yakovlev, P.L.Chapovsky
Categories: physics.atom-ph
Comments: 12 pages, 4 figures
Subj-class: Atomic Physics
   Measurements of rubidium lifetime in a dark magneto-optical trap (DMOT) was
performed at various populations of the bright and dark hyperfine states of the
trapped atoms. The rubidium lifetime in the trap appeared to be shorter if the
atom spent more time in the bright state. A simple explanation of this effect
is based on the increase of the cross-section of rubidium collisions with the
surrounding warm atoms upon rubidium electronic excitation.
\\ ( , 84kb)
Paper: cond-mat/0612659
Date: Thu, 28 Dec 2006 07:23:15 GMT (65kb)

Title: Super-shell structure in harmonically trapped fermionic gases and its
   semi-classical interpretation
Authors: M. Ogren, Y. Yu, S. Aberg, S. M. Reimann, M. Brack
Categories: cond-mat.other
Comments: Final version of procedings for the 'Nilsson conference'
Subj-class: Other
Journal-ref: Phys. Scr. T125 (2006) 37-40
   It was recently shown in self-consistent Hartree-Fock calculations that a
harmonically trapped dilute gas of fermionic atoms with a repulsive two-body
interaction exhibits a pronounced {\it super-shell} structure: the shell
fillings due to the spherical harmonic trapping potential are modulated by a
beat mode. This changes the ``magic numbers'' occurring between the beat nodes
by half a period. The length and amplitude of the beating mode depends on the
strength of the interaction. We give a qualitative interpretation of the beat
structure in terms of a semiclassical trace formula that uniformly describes
the symmetry breaking U(3) $\to$ SO(3) in a 3D harmonic oscillator potential
perturbed by an anharmonic term $\propto r^4$ with arbitrary strength. We show
that at low Fermi energies (or particle numbers), the beating gross-shell
structure of this system is dominated solely by the two-fold degenerate
circular and (diametrically) pendulating orbits.
\\ ( , 65kb)
Paper: cond-mat/0612664
Date: Thu, 28 Dec 2006 18:22:12 GMT (70kb)

Title: Vortex quantum creation and winding number scaling in a quenched spinor
   Bose gas
Authors: Michael Uhlmann, Ralf Sch\"utzhold, and Uwe R. Fischer
Categories: cond-mat.other
Comments: 4 pages of RevTex4, 2 figures
Subj-class: Other
   Motivated by a recent experiment, we study non-equilibrium quantum phenomena
taking place in the quench of a spinor Bose-Einstein condensate through the
zero-temperature phase transition separating the paramagnetic and ferromagnetic
phases. We derive the typical spin domain structure (correlations of the
effective magnetization) created by the quench arising due to spin-mode
fluctuations, and establish a sample-size scaling law for the creation of spin
vortices, which are topological defects in the transverse magnetization.
\\ ( , 70kb)
Paper: cond-mat/0612670
Date: Thu, 28 Dec 2006 19:42:23 GMT (28kb)

Title: Anderson Localization of Expanding Bose-Einstein Condensates in Random
Authors: Laurent Sanchez-Palencia (LCFIO), David Cl\'{e}ment (LCFIO), Pierre
   Lugan (LCFIO), Philippe Bouyer (LCFIO), Georgy V. Shlyapnikov (LPTMS), Alain
   Aspect (LCFIO)
Categories: cond-mat.other
Comments: 4 pages, 2 figures
Proxy: ccsd hal-00122278
Subj-class: Other
   We show that the expansion of an initially confined interacting 1D
Bose-Einstein condensate can exhibit Anderson localization in a weak random
potential. For speckle potentials used in quantum gases, the Fourier transform
of the correlation function has a finite support and in 1D there is a mobility
edge $\k_m=1/\sigma_R$, where $\sigma_R$ is the correlation length of the
disorder. Then, for the initial healing length of the expanding condensate
$\xi_{ini}>\sigma_R$ the localization is exponential, and for
$\xi_{ini}<\sigma_R$ it changes to algebraic.
\\ ( , 28kb)
Paper (*cross-listing*): gr-qc/0407075
Date: Tue, 20 Jul 2004 00:31:46 GMT (16kb)

Title: Gravitational Vacuum Condensate Stars
Authors: Pawel O. Mazur, Emil Mottola (University of South Carolina, Los Alamos
   National Laboratory)
Categories: gr-qc hep-ph hep-th quant-ph
Comments: 17 pages, LaTeX file
Journal-ref: Proc. Nat. Acad. Sci. 101 (2004) 9545-9550
DOI: 10.1073/pnas.0402717101
   A new final state of gravitational collapse is proposed. By extending the
concept of Bose-Einstein condensation to gravitational systems, a cold, dark,
compact object with an interior de Sitter condensate $p_{_V} = -\rho_{_V}$ and
an exterior Schwarzschild geometry of arbitrary total mass $M$ is constructed.
These are separated by a shell with a small but finite proper thickness $\ell$
of fluid with equation of state $p=+\rho$, replacing both the Schwarzschild and
de Sitter classical horizons. The new solution has no singularities, no event
horizons, and a global time. Its entropy is maximized under small fluctuations
and is given by the standard hydrodynamic entropy of the thin shell, which is
of order $k_{_B}\ell Mc/\hbar$, instead of the Bekenstein-Hawking entropy
formula, $S_{_{BH}}= 4\pi k_{_B} G M^2/\hbar c$. Hence unlike black holes, the
new solution is thermodynamically stable and has no information paradox.
\\ ( , 16kb)

The replacements:

Paper: quant-ph/0610029
replaced with revised version Thu, 14 Dec 2006 22:55:23 GMT (881kb)

Title: Cavity QED determination of atomic number statistics in optical lattices
Authors: W. Chen, D. Meiser, and P. Meystre
Categories: quant-ph cond-mat.other physics.atom-ph
Comments: 10 pages revtex, 13 figures
Subj-class: Quantum Physics; Other; Atomic Physics
\\ ( , 881kb)
Paper: physics/0608021
replaced with revised version Fri, 15 Dec 2006 15:36:01 GMT (231kb)

Title: From Optical Lattice Clocks to the Measurement of Forces in the Casimir
Authors: Peter Wolf (SYRTE, BIPM), Pierre Lemonde (SYRTE), Astrid Lambrecht
   (LKB - Jussieu), Sebastien Bize (SYRTE), Arnaud Landragin (SYRTE), Andre
   Clairon (SYRTE)
Categories: physics.atom-ph
Comments: revised and extended version
Proxy: ccsd ccsd-00088469
Subj-class: Atomic Physics
\\ ( , 231kb)
Paper: cond-mat/0606706
replaced with revised version Mon, 18 Dec 2006 20:19:21 GMT (229kb)

Title: Superfluidity and excitations at unitarity
Authors: Dean Lee (North Carolina State University)
Categories: cond-mat.stat-mech cond-mat.supr-con
Comments: 40 pages, 19 figures, revised version includes new data on
   two-particle density correlations
Subj-class: Statistical Mechanics; Superconductivity
\\ ( , 229kb)
Paper: cond-mat/0609390
replaced with revised version Sun, 17 Dec 2006 18:13:10 GMT (85kb)

Title: Precision Measurements of Collective Oscillations in the BEC-BCS
Authors: A. Altmeyer, S. Riedl, C. Kohstall, M. Wright, R. Geursen, M.
   Bartenstein, C. Chin, J. Hecker Denschlag, R. Grimm
Categories: cond-mat.other cond-mat.supr-con
Comments: improved discussion of small ellipticity and anharmonicity
Subj-class: Other; Superconductivity
\\ ( , 85kb)
Paper: quant-ph/0512149
replaced with revised version Mon, 18 Dec 2006 03:57:15 GMT (18kb)

Title: Quantum state transfer from light to molecules via coherent two-color
   photo-association in an atomic Bose-Einstein condensate
Authors: Hui Jing and Ming-Sheng Zhan
Comments: 1 figure, accepted by Eur.Phys.J.D on Dec.15,2006
\\ ( , 18kb)
Paper: cond-mat/0608656
replaced with revised version Wed, 20 Dec 2006 01:55:38 GMT (306kb)

Title: Dynamical vortex phases in a Bose-Einstein condensate driven by a
   rotating optical lattice
Authors: Kenichi Kasamatsu, Makoto Tsubota
Categories: cond-mat.other
Comments: 4 pages, 3 figures
Subj-class: Other
Journal-ref: Phys. Rev. Lett. 97, 240404 (2006)
\\ ( , 306kb)
Paper: cond-mat/0603273
replaced with revised version Thu, 21 Dec 2006 18:38:39 GMT (581kb)

Title: Ultracold atomic Bose and Fermi spinor gases in optical lattices
Authors: K. Eckert, L. Zawitkowski, M.J. Leskinen, A. Sanpera, M.Lewenstein
Categories: cond-mat.other
Comments: 15 pages, 5 figures; a completely new and substantially expanded
   version with several errors corrected
Subj-class: Other
\\ ( , 581kb)
Paper: quant-ph/0610033
replaced with revised version Thu, 21 Dec 2006 12:57:23 GMT (8kb)

Title: Macroscopic realism, wave-particle duality and the superposition
Authors: N. L. Chuprikov
Comments: Latex, 8 pages; the article is thoroughly rewritten
\\ ( , 8kb)
Paper: cond-mat/0606322
replaced with revised version Sat, 23 Dec 2006 06:42:52 GMT (750kb)

Title: Finite Temperature Phase Diagram of a Two-Component Fermi Gas with
   Density Imbalance
Authors: Lianyi He, Meng Jin and Pengfei Zhuang
Categories: cond-mat.supr-con cond-mat.other cond-mat.stat-mech physics.atom-ph
Comments: Final published version
Subj-class: Superconductivity; Other; Statistical Mechanics; Atomic Physics
Journal-ref: Phys. Rev. B 74, 214516 (2006)
DOI: 10.1103/PhysRevB.74.214516
\\ ( , 750kb)
Paper: cond-mat/0608472
replaced with revised version Sun, 24 Dec 2006 09:47:33 GMT (23kb)

Title: Conserving Gapless Mean-Field Theory of a Multi-Component Bose-Einstein
Authors: Yoshiyuki Kondo, Takafumi Kita
Categories: cond-mat.stat-mech
Comments: 8 pages, 7 figures
Subj-class: Statistical Mechanics
\\ ( , 23kb)
Paper: physics/0612182
replaced with revised version Fri, 22 Dec 2006 11:16:03 GMT (239kb)

Title: Dimension of holes and high-temperature condensate in Bose--Einstein
Authors: V. P. Maslov
Categories: physics.gen-ph
Comments: 14 pages, 3 figures; minor correction on p.11
Subj-class: General Physics
\\ ( , 239kb)
Paper: cond-mat/0607405
replaced with revised version Thu, 28 Dec 2006 20:54:51 GMT (513kb)

Title: Density fingerprint of giant vortices in Fermi gases near a Feshbach
Authors: Hui Hu and Xia-Ji Liu
Categories: cond-mat.supr-con cond-mat.str-el
Comments: 4 pages and 5 figures, fig. 5 is changed. Editorially approved for
   publication in Physical Review A (as a Rapid Communication)
Subj-class: Superconductivity; Strongly Correlated Electrons
\\ ( , 513kb)

Dr M. J. Davis,               Senior Lecturer in Physics
School of Physical Sciences,  email:
University of Queensland,     ph   : +61 7 334 69824
Brisbane, QLD 4072,           fax  : +61 7 336 51242
Matt's arXiv selection: weekly summary of cold-atom papers from
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