Matt's arXiv selection: week ending 12 October 2007.

From: Matthew Davis <>
Date: Tue, 30 Oct 2007 22:09:26 +1000 (EST)

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

Hi all,

In a slightly unusual occurence, this week there is one less preprint (24) and
two fewer replacements (12) than last week. Feynman would fail to be impressed,
and now that I see it written in front of me, so am I.

Date: Thu, 4 Oct 2007 20:11:22 GMT (824kb)

Title: Vortex lattices of bosons in deep rotating lattices
Authors: Dan Goldbaum, Erich Mueller
Categories: cond-mat.other
Comments: 13 Pages, 5 Figures
   We study vortex-lattice phases for a Bose gas trapped in a rotating optical
lattice near the Mott-Hubbard transition. We find a series of transitions where
vortices are pinned with their cores on plaquettes/sites. We discuss
connections between these vortex structures and the Hofstadter butterfly
spectrum of free particles on a rotating lattice.
\\ ( , 824kb)
Date: Fri, 5 Oct 2007 10:38:01 GMT (60kb)

Title: Dark matter-wave solitons in the dimensionality crossover
Authors: G. Theocharis, P.G. Kevrekidis, M.K. Oberthaler and D.J. Frantzeskakis
Categories: cond-mat.other
Comments: Phys. Rev. A, in press
   We consider the statics and dynamics of dark matter-wave solitons in the
dimensionality crossover regime from 3D to 1D. There, using the nonpolynomial
Schr\"{o}dinger mean-field model, we find that the anomalous mode of the
Bogoliubov spectrum has an eigenfrequency which coincides with the soliton
oscillation frequency obtained by the 3D Gross-Pitaevskii model. We show that
substantial deviations (of order of 10% or more) from the characteristic
frequency $\omega_{z}/\sqrt{2}$ ($\omega_{z}$ being the longitudinal trap
frequency) are possible even in the purely 1D regime.
\\ ( , 60kb)
Date: Fri, 5 Oct 2007 12:52:24 GMT (117kb)

Title: Exploiting soliton decay and phase fluctuations in atom chip
   interferometry of Bose-Einstein condensates
Authors: R.G. Scott, T.E. Judd, T.M. Fromhold
Categories: cond-mat.other
Comments: 5 pages, 5 figures
   We show that the decay of a soliton into vortices provides a mechanism for
measuring the initial phase difference between two merging Bose-Einstein
condensates. At very low temperatures, the mechanism is resonant, operating
only when the clouds start in anti-phase. But at higher temperatures, phase
fluctuations trigger vortex production over a wide range of initial relative
phase, as observed in recent experiments at MIT. Choosing the merge time to
maximize the number of vortices created makes the interferometer highly
sensitive to spatially varying phase patterns and hence atomic movement.
\\ ( , 117kb)
Date: Fri, 5 Oct 2007 14:24:09 GMT (59kb)

Title: Detection of Spin Correlations in Optical Lattices by Light Scattering
Authors: Ines de Vega, J. Ignacio Cirac, D. Porras
Categories: quant-ph
   We show that spin correlations of atoms in an optical lattice can be
reconstructed by coupling the system to the light, and by measuring
correlations between the emitted photons. This principle is the basis for a
method to characterize states in quantum computation and simulation with
optical lattices. As examples, we study the detection of spin correlations in a
quantum magnetic phase, and the characterization of cluster states.
\\ ( , 59kb)
Date: Fri, 5 Oct 2007 14:57:17 GMT (315kb)

Title: Spectroscopy of strontium Rydberg states using electromagnetically
   induced transparency
Authors: S. Mauger, J. Millen and M. P. A. Jones
Categories: quant-ph
Comments: 8 pages, 4 figures
   We report on the all-optical detection of Rydberg states in a effusive atomic
beam of strontium atoms using electromagnetically induced transparency (EIT).
Using narrow-linewidth CW lasers we obtain an EIT linewidth of 5 MHz. To
illustrate the high spectroscopic resolution offered by this method, we have
measured isotope shifts of the 5s18d ^1D_2 and 5s19s ^1S_0 Rydberg states. This
technique could be applied to high-resolution, non-destructive measurements of
ultra-cold Rydberg gases and plasmas.
\\ ( , 315kb)
Date: Sat, 6 Oct 2007 09:37:26 GMT (27kb)

Title: Exact Numerical Study of Pair Formation with Imbalanced Fermion
Authors: G. G. Batrouni, M. H. Huntley, V. G. Rousseau and R. T. Scalettar
Categories: cond-mat.str-el
   We present an exact Quantum Monte Carlo study of the attractive 1-dimensional
Hubbard model with imbalanced fermion population. The pair-pair correlation
function, which decays monotonically in the absence of polarization P, develops
oscillations when P is nonzero, characteristic of
Fulde-Ferrell-Larkin-Ovchinnikov phase. The pair momentum distribution peaks at
a momentum equal to the difference in the Fermi momenta. At strong coupling,
the minority and majority momentum distributions are shown to be deformed,
reflecting the presence of the other species, and its Fermi surface. The FFLO
oscillations survive the presence of a confining potential, and the local
polarization at the trap center exhibits a marked dip, similar to that observed
\\ ( , 27kb)
Date: Sat, 6 Oct 2007 10:58:32 GMT (104kb)

Title: Quantum Monte Carlo Study of a Dynamic Hubbard Model
Authors: K. Bouadim, M. Enjalran, F. Hebert, G.G. Batrouni, and R.T. Scalettar
Categories: cond-mat.supr-con cond-mat.str-el
   The `dynamic' Hubbard Hamiltonian describes interacting fermions on a lattice
whose on-site repulsion is modulated by a coupling to a fluctuating bosonic
field. We investigate one such model, introduced by Hirsch, using the
determinant Quantum Monte Carlo method. Our key result is that the extended
s-wave pairing vertex, repulsive in the usual static Hubbard model, becomes
attractive as the coupling to the fluctuating Bose field increases. The sign
problem prevents us from exploring a low enough temperature to see if a
superconducting transition occurs. We also observe a stabilization of
antiferromagnetic correlations and the Mott gap near half-filling, and a near
linear behavior of the energy as a function of particle density which indicates
a tendency toward phase separation.
\\ ( , 104kb)
Date: Sat, 6 Oct 2007 16:45:58 GMT (357kb)

Title: Emergent Symmetry and Dimensional Reduction at a Quantum Critical Point
Authors: J. Schmalian and C. D. Batista
Categories: cond-mat.str-el
   We show that the spatial dimensionality of the quantum critical point
associated with Bose--Einstein condensation at T=0 is reduced when the
underlying lattice comprises a set of layers coupled by a frustrating
interaction. For this purpose, we use an heuristic mean field approach that is
complemented and justified by a more rigorous renormalization group analysis.
Due to the presence of an emergent symmetry, i.e. a symmetry of the ground
state that is absent in the underlying Hamiltonian, a three--dimensional
interacting Bose system undergoes a chemical potential tuned quantum phase
transition that is strictly two dimensional. Our theoretical predictions for
the critical temperature as a function of the chemical potential correspond
very well with recent measurements in BaCuSi$_{2}$O$_{6}$.
\\ ( , 357kb)
Date: Mon, 8 Oct 2007 13:34:59 GMT (48kb)

Title: Phase separation in a polarized Fermi gas at zero temperature
Authors: S. Pilati and S. Giorgini (Dipartimento di Fisica, Universit\`a di
   Trento and CNR-INFM BEC Center, Povo, Trento, Italy)
Categories: cond-mat.other
Comments: 5 pages, 4 figures
   We investigate the phase diagram of asymmetric two-component Fermi gases at
zero temperature as a function of polarization and interaction strength. The
equations of state of the uniform superfluid and normal phase are determined
using quantum Monte Carlo simulations. We find three different mixed states,
where the superfluid and the normal phase coexist in equilibrium, corresponding
to phase separation between: (a) the polarized superfluid and the fully
polarized normal gas, (b) the polarized superfluid and the partially polarized
normal gas and (c) the unpolarized superfluid and the partially polarized
normal gas.
\\ ( , 48kb)
Date: Mon, 8 Oct 2007 15:30:12 GMT (654kb)

Title: Full distribution functions of quantum noise in an interacting many-body
Authors: S. Hofferberth, I. Lesanovsky, T. Schumm, J. Schmiedmayer, A.
   Imambekov, V. Gritsev, E. Demler
Categories: cond-mat.other
   The probabilistic nature of measurements and the resulting intrinsic quantum
noise in observables is one of the fundamental aspects of quantum mechanics
[1]. It is well studied on the single-particle level and for non-interacting
systems [2] but much less understood for interacting many-body systems, where
quantum noise can reveal the non-local correlations and entanglement of the
underlying many-body states [3]. Here, we present the first measurement of the
full distribution functions of quantum noise in an interacting many-body
system. The shot-to-shot statistical properties of interference experiments,
performed with pairs of independent one-dimensional atomic condensates, can be
directly related to the full distribution functions of noise in the system [4].
Probing different system sizes we observe the crossover from quantum noise to
thermal noise, reflected in a characteristic change in the distribution
functions from Gumbel-type to Poissonian, in excellent agreement with
predictions based on the Luttinger liquid formalism [5-7]. Our results
demonstrate the power of quantum noise analysis as a probe of strongly
correlated systems, and the power of simple ultracold atom systems to
illustrate and 'quantum simulate' fundamental quantum processes relevant in
many areas of physics.
\\ ( , 654kb)
arXiv:0710.0895 (*cross-listing*)
Date: Wed, 3 Oct 2007 22:10:43 GMT (177kb)

Title: Revealing anyonic statistics with multiphoton entanglement
Authors: J. K. Pachos, W. Wieczorek, C. Schmid, N. Kiesel, R. Pohlner, H.
Categories: quant-ph cond-mat.mes-hall hep-th physics.optics
Comments: 14 pages, 4 figures
   The collective statistical behaviour of quantum particles is, according to
Pauli, determined by their spin. In three spatial dimensions, there are only
two possible types of statistics, dividing particles into two groups: bosons
and fermions. However, if one is restricted to two-dimensional systems the
situation changes drastically. There, anyons can appear, which exhibit
fractional statistics ranging continuously from bosonic to fermionic behaviour.
This is manifested by the observation that their quantum state can acquire
"any" phase when one anyon is exchanged with another one, in contrast to the
restricted values +1 for bosons and -1 for fermions. Anyons are responsible for
the fractional quantum Hall effect and should be realized as quasiparticles in
highly entangled many-body systems. The isolation of anyons in these systems
requires cooling to very low temperatures where only the ground and a few
excited states are populated. However, the continuing presence of interactions
makes anyons quite elusive and, despite substantial experimental effort, their
definitive detection remains open. Here, as an alternative approach, we encode
the relevant many-body state of an anyonic model in the multi-partite entangled
state of polarized photons. This quantum system is intrinsically stable against
decoherence. It enables easy manipulation and detection of abelian anyons,
allows for the demonstration of their fusion rules and facilitates the
unambiguous determination of their statistical properties. The experiments
directly demonstrate the presence of fractional statistics in a physical
\\ ( , 177kb)
Date: Sat, 6 Oct 2007 03:19:08 GMT (168kb)

Title: Resonant ratcheting of a Bose-Einstein condensate
Authors: Luis Morales-Molina and Sergej Flach
Categories: quant-ph
   We study the rectification process of interacting quantum particles in a
periodic potential exposed to the action of an external ac driving. The
breaking of spatio-temporal symmetries leads to directed motion already in the
absence of interactions. A hallmark of quantum ratcheting is the appearance of
resonant enhancement of the current (Europhys. Lett. 79 (2007) 10007 and Phys.
Rev. A 75 (2007) 063424). Here we study the fate of these resonances within a
Gross-Pitaevskii equation which describes a mean field interaction between many
particles. We find, that the resonance is i) not destroyed by interactions, ii)
shifting its location with increasing interaction strength. We trace the
Floquet states of the linear equations into the nonlinear domain, and show that
the resonance gives rise to an instability and thus to the appearance of new
nonlinear Floquet states, whose transport properties differ strongly as
compared to the case of noninteracting particles.
\\ ( , 168kb)
Date: Tue, 9 Oct 2007 09:16:32 GMT (961kb)

Title: Formation of solitons in atomic Bose-Einstein condensates by dark-state
   adiabatic passage
Authors: G. Juzeliunas, J. Ruseckas, P. \"Ohberg, M. Fleischhauer
Categories: cond-mat.soft
Comments: 10 figures
Journal-ref: Lithuanian. J. Phys. 47 (3), 351-360 (2007)
   We propose a new method of creating solitons in elongated Bose-Einstein
Condensates (BECs) by sweeping three laser beams through the BEC. If one of the
beams is in the first order (TEM10) Hermite-Gaussian mode, its amplitude has a
transversal phase slip which can be transferred to the atoms creating a
soliton. Using this method it is possible to circumvent the restriction set by
the diffraction limit inherent to conventional methods such as phase
imprinting. The method allows one to create multicomponent (vector) solitons of
the dark-bright form as well as the dark-dark combination. In addition it is
possible to create in a controllable way two or more dark solitons with very
small velocity and close to each other for studying their collisional
\\ ( , 961kb)
Date: Tue, 9 Oct 2007 10:11:41 GMT (182kb)

Title: Quench dynamics and defect production in the Kitaev model
Authors: K. Sengupta, Diptiman Sen, Shreyoshi Mondal
Categories: cond-mat.stat-mech cond-mat.str-el
Comments: 5 pages including 4 figures
   We study quench dynamics and defect production in the Kitaev model where the
quench takes the system across a critical line. We point out that in such a
situation, for a slow quench rate 1/\tau, the defect density n \sim
1/\sqrt{\tau} in contrast to the 1/\tau behavior expected for quench through a
critical point. We show, by an exact computation of some multi-spin correlation
functions, that the defects thus generated are spatially anisotropic. We
discuss the variation of the shape and size of the defects with both the rate
of quench and the model parameters.
\\ ( , 182kb)
Date: Tue, 9 Oct 2007 15:27:12 GMT (661kb)

Title: Absence of fermionic quasi-particles in the BEC regime of the attractive
   Fermi gas
Authors: Nils Lerch, Lorenz Bartosch, and Peter Kopietz
Categories: cond-mat.supr-con cond-mat.str-el
Comments: 4 RevTex pages, 3 figures
   We calculate the effect of order parameter fluctuations on the fermionic
single-particle excitations of the attractive Fermi gas in the BEC regime where
the binding energy of the s-wave bound state is the largest energy scale. We
show that in dimensions D <= 3 the singular interaction between the fermions
mediated by the gapless Bogoliubov-Anderson mode prohibits the existence of
well-defined quasi-particles. We explicitly calculate the single-particle
spectral function in D=3 and show that in this case the quasi-particle residue
and the density of states are logarithmically suppressed.
\\ ( , 661kb)
Date: Tue, 9 Oct 2007 15:27:12 GMT (661kb)

Title: Absence of fermionic quasi-particles in the BEC regime of the attractive
   Fermi gas
Authors: Nils Lerch, Lorenz Bartosch, and Peter Kopietz
Categories: cond-mat.supr-con cond-mat.str-el
Comments: 4 RevTex pages, 3 figures
   We calculate the effect of order parameter fluctuations on the fermionic
single-particle excitations of the attractive Fermi gas in the BEC regime where
the binding energy of the s-wave bound state is the largest energy scale. We
show that in dimensions D <= 3 the singular interaction between the fermions
mediated by the gapless Bogoliubov-Anderson mode prohibits the existence of
well-defined quasi-particles. We explicitly calculate the single-particle
spectral function in D=3 and show that in this case the quasi-particle residue
and the density of states are logarithmically suppressed.
\\ ( , 661kb)
Date: Tue, 9 Oct 2007 18:40:20 GMT (10kb,D)

Title: Long wavelength spin dynamics of ferromagnetic condensates
Authors: Austen Lamacraft
Categories: cond-mat.other cond-mat.supr-con
   We obtain the equations of motion for a ferromagnetic Bose condensate of
arbitrary spin in the long wavelength limit. We find that the magnetization of
the condensate is described by a non-trivial modification of the
Landau-Lifshitz equation, in which the magnetization is advected by the
superfluid velocity. This hydrodynamic description, valid when the condensate
wavefunction varies on scales much longer than either the density or spin
healing lengths, is both physically more transparent and computationally
simpler than the corresponding time-dependent Gross-Pitaevskii equation. We
discuss the conservation laws of the theory and its application to the analysis
of the stability of magnetic helices and Larmor precession. Precessional
instabilities in particular provide a novel physical signature of dipolar
\\ ( , 10kb)
Date: Tue, 9 Oct 2007 18:42:18 GMT (37kb)

Title: Engineering many-body quantum dynamics by disorder
Authors: Pierfrancesco Buonsante and Sandro Wimberger
Categories: cond-mat.dis-nn cond-mat.stat-mech
Comments: 11 pages, 4 figures
   Going beyond the currently investigated regimes in experiments on quantum
transport of ultracold atoms in disordered potentials, we predict a crossover
between regular and quantum-chaotic dynamics when varying the strength of
disorder. Our spectral approach is based on the Bose-Hubbard model describing
interacting atoms in deep random potentials. The predicted crossover from
localized to diffusive dynamics depends on the simultaneous presence of
interactions and disorder, and can be verified in the laboratory by monitoring
the evolution of typical experimental initial states.
\\ ( , 37kb)
Date: Tue, 9 Oct 2007 15:11:39 GMT (68kb)

Title: A number filter for matter-waves
Authors: G. Nandi, A. Sizmann, J. Fort\'agh, R. Walser
Categories: quant-ph
Comments: 7 pages Latex, 5 eps color figures
   In current Bose-Einstein condensate experiments, the shot-to-shot variation
of atom number fluctuates up to 10%. In here, we present a procedure to
suppress such fluctuations by using a nonlinear p-pi-pbar matter wave
interferometer for a Bose-Einstein condensate with two internal states and a
high beam-splitter asymmetry (p, pbar not-equal 0.5). We analyze the situation
for an inhomogeneous trap within the Gross-Pitaevskii mean-field theory, as
well as a quantum mechanical Josephson model, which addresses complementary
aspects of the problem and agrees well otherwise.
\\ ( , 68kb)
Date: Wed, 10 Oct 2007 06:59:08 GMT (537kb)

Title: Stripe Formation in Fermionic Atoms on 2-D Optical Lattice inside a Box
   Trap: DMRG Studies for Repulsive Hubbard Model with Open Boundary Condition
Authors: M. Machida, M. Okumura, S. Yamada
Categories: cond-mat.str-el
   We suggest that box shape trap enables to observe intrinsic properties of the
repulsive Hubbard model in a fixed doping in contrast to the harmonic trap
bringing about spatial variations of atom density profiles. In order to predict
atomic density profile under the box trap, we apply the directly-extended
density-matrix renormalization group method to 4-leg repulsive Hubbard model
with the open boundary condition. Consequently, we find that stripe formation
is universal in a low hole doping range and the stripe sensitively changes its
structure with variations of $U/t$ and the doping rate. A remarkable change is
that a stripe formed by a hole pair turns to one by a bi-hole pair when
entering a limited strong $U/t$ range. Furthermore, a systematic calculation
reveals that the Hubbard model shows a change from the stripe to the Friedel
like oscillation with increasing the doping rate.
\\ ( , 537kb)
Date: Wed, 10 Oct 2007 12:14:47 GMT (674kb)

Title: Density Modulations in an Elongated BEC Released from a Disordered
Authors: David Cl\'ement (LCFIO), Philippe Bouyer (LCFIO), Alain Aspect
   (LCFIO), Laurent Sanchez-Palencia (LCFIO)
Categories: cond-mat.other
Proxy: ccsd hal-00178074
   We observe large density modulations in time-of-flight images of elongated
Bose-Einstein condensates, initially confined in a harmonic trap and in the
presence of weak disorder. The development of these modulations during the
time-of-flight and their dependence with the disorder are investigated. We
render an account of this effect using numerical and analytical calculations.
Our analysis shows how the observed large modulations originate from the weak
initial density modulations induced by the disorder, and do not require phase
fluctuations (thermal or quantum) in the initial condensate.
\\ ( , 674kb)
Date: Thu, 11 Oct 2007 07:49:17 GMT (421kb)

Title: Zel'dovich-Starobinsky Effect in Atomic Bose-Einstein Condensates:
   Analogy to Kerr Black Hole
Authors: Hiromitsu Takeuchi, Makoto Tsubota and Grigory E. Volovik
Categories: cond-mat.other
Comments: 6 pages, 3 figures,submitted to JLTP
   We consider circular motion of a heavy object in an atomic Bose-Einstein
condensate (BEC) at $T=0{\rm K}$. Even if the linear velocity of the object is
smaller than the Landau critical velocity, the object may radiate
quasiparticles and thus experience the quantum friction. The radiation process
is similar to Zel'dovich-Starobinskii (ZS) effect -- the radiation by a
rotating black hole. This analogy emerges when one introduces the effective
acoustic metric for quasiparticles. In the rotating frame this metric has an
ergosurface, which is similar to the ergosurface in the metric of a rotating
black hole. In a finite size BEC, the quasiparticle creation takes place when
the ergosurface is within the condensate and occurs via quantum tunneling from
the object into the ergoregion. The dependence of the radiation rate on the
position of the ergosurface is investigated.
\\ ( , 421kb)
Date: Thu, 11 Oct 2007 11:46:24 GMT (69kb)

Title: Quantum phase of mixtures of atoms and molecules on optical lattices
Authors: V.G. Rousseau and P.J.H. Denteneer
Categories: cond-mat.stat-mech
Comments: 7 pages, 10 figures
   We investigate the phase diagram of a two-species Bose-Hubbard model
including a conversion term, by which two particles from the first species can
be converted into one particle of the second species, and vice-versa. The model
can be related to ultra-cold atom experiments in which a Feshbach resonance
produces long-lived bound states viewed as diatomic molecules. The model is
solved exactly by means of Quantum Monte Carlo simulations. We show than an
"inversion of population" occurs, depending on the parameters, where the second
species becomes more numerous than the first species. The model also exhibits
an exotic incompressible "Super-Mott" phase where the particles from both
species can flow with signs of superfluidity, but without global supercurrent.
We present two phase diagrams, one in the (chemical potential, conversion)
plane, the other in the (chemical potential, detuning) plane.
\\ ( , 69kb)
Date: Wed, 10 Oct 2007 21:07:30 GMT (108kb)

Title: Atom detection and photon production in a scalable, open, optical
Authors: M. Trupke, J. Goldwin, B. Darqui\'e, G. Dutier, S. Eriksson, J.
   Ashmore, E. A. Hinds
Categories: quant-ph
Comments: 4 pages, 4 figures. A typographical error in the published paper has
   been corrected (equation of the corrected normalized variance, page 3, 2nd
Journal-ref: Phys. Rev. Lett. 99, 063601 (2007)
   A microfabricated Fabry-Perot optical resonator has been used for atom
detection and photon production with less than 1 atom on average in the cavity
mode. Our cavity design combines the intrinsic scalability of microfabrication
processes with direct coupling of the cavity field to single-mode optical
waveguides or fibers. The presence of the atom is seen through changes in both
the intensity and the noise characteristics of probe light reflected from the
cavity input mirror. An excitation laser passing transversely through the
cavity triggers photon emission into the cavity mode and hence into the
single-mode fiber. These are first steps towards building an optical
microcavity network on an atom chip for applications in quantum information
\\ ( , 108kb)

The replacements:

replaced with revised version Fri, 5 Oct 2007 07:12:26 GMT (707kb)

Title: Fulde-Ferrell-Larkin-Ovchinnikov states in one-dimensional
   spin-polarized ultracold atomic Fermi gases
Authors: Xia-Ji Liu, Hui Hu, and Peter D. Drummond
Categories: cond-mat.stat-mech cond-mat.str-el
Comments: 22 papes, 19 figures
Journal-ref: Phys. Rev. A 76, 043605 (2007)
DOI: 10.1103/PhysRevA.76.043605
\\ ( , 707kb)
replaced with revised version Sat, 6 Oct 2007 10:04:44 GMT (20kb)

Title: Bose-Einstein condensation of strongly interacting dipolar gases
Authors: Daw-Wei Wang
Categories: cond-mat.other cond-mat.supr-con
Comments: Extended verion (8 pages, 1 figure)
\\ ( , 20kb)
replaced with revised version Mon, 8 Oct 2007 19:17:16 GMT (63kb)

Title: Specific heat of a one-dimensional interacting Fermi system: the role of
Authors: Andrey V. Chubukov, Dmitrii L. Maslov, and Ronojoy Saha
Categories: cond-mat.str-el cond-mat.mes-hall
Comments: 20 pages, 7 figures; discussion of the two-cutoff model is modified;
   a new figure is added
\\ ( , 63kb)
replaced with revised version Tue, 9 Oct 2007 19:15:43 GMT (163kb)

Title: Preparation and detection of magnetic quantum phases in optical
Authors: A. M. Rey, V. Gritsev, I. Bloch, E. Demler and M.D. Lukin
Categories: cond-mat.other
Comments: 5 pages, 2 Figures, reference added
Journal-ref: Phys. Rev . Lett 99, 140601 (2007)
\\ ( , 163kb)
arXiv:0705.4647 (*cross-listing*)
replaced with revised version Tue, 9 Oct 2007 16:06:06 GMT (88kb)

Title: Bell's inequality and universal quantum gates in a cold atom chiral
   fermionic p-wave superfluid
Authors: Chuanwei Zhang, Sumanta Tewari, S. Das Sarma
Categories: quant-ph cond-mat.str-el
Comments: 4+ pages, 3 figures, minor corrections, accepted for publication in
\\ ( , 88kb)
replaced with revised version Sun, 7 Oct 2007 07:06:00 GMT (910kb)

Title: Coherent Control of Trapped Bosons
Authors: Analabha Roy, Linda E. Reichl
Categories: physics.atom-ph
Comments: 17 figures, Figs 15 and 16 modified in version 4 to correct for a
   small numerical error observed in version 3
\\ ( , 910kb)
replaced with revised version Wed, 10 Oct 2007 12:11:45 GMT (629kb)

Title: Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC
   Crossover Regime
Authors: T. Mizushima, M. Ichioka, K. Machida
Categories: cond-mat.supr-con
Comments: 16 pages, 13 figures, replaced by the version to appear in J. Phys.
   Soc. Jpn
Journal-ref: J. Phys. Soc. Jpn. 76, 104006 (2007)
\\ ( , 629kb)
replaced with revised version Thu, 11 Oct 2007 15:42:21 GMT (201kb)

Title: Camparison of the Hanbury Brown-Twiss effect for bosons and fermions
Authors: Tom Jeltes (LASER Center Vrije), John M. McNamara (LASER Center
   Vrije), Wim Hogervorst (LASER Center Vrije), Wim Vassen (LASER Center Vrije),
   Valentina Krachmalnicoff (LCFIO), Martijn Schellekens (LCFIO), Aur\'elien
   Perrin (LCFIO), Hong Chang (LCFIO), Denis Boiron (LCFIO), Alain Aspect
   (LCFIO), Christoph I. Westbrook (LCFIO)
Categories: cond-mat.other
Comments: Nature 445, 402 (2007). V2 includes the supplementary information
Proxy: ccsd hal-00119748
Journal-ref: Nature 445 (2007) 402
DOI: 10.1038/nature05513
\\ ( , 201kb)
arXiv:0704.0386 (*cross-listing*)
replaced with revised version Thu, 11 Oct 2007 18:55:20 GMT (17kb)

Title: Quantum non-local effects with Bose-Einstein condensates
Authors: Franck Lalo\"e (LKB - Lhomond), William J. Mullin (UMASS)
Categories: quant-ph cond-mat.other
Comments: version published, with a shorter abstract to fit into the 9 lines of
   PRL, one more reference, and minor changes
Journal-ref: Physical Review Letters 99 (2007) 150401
\\ ( , 17kb)
arXiv:0704.3047 (*cross-listing*)
replaced with revised version Thu, 11 Oct 2007 08:28:37 GMT (734kb)

Title: Observation of atom pairs in spontaneous four wave mixing of two
   colliding Bose-Einstein Condensates
Authors: A. Perrin (LCFIO), H. Chang (LCFIO), V. Krachmalnicoff (LCFIO), M.
   Schellekens (LCFIO), D. Boiron (LCFIO), A. Aspect (LCFIO), C. I. Westbrook
Categories: quant-ph cond-mat.other
Comments: additional file reference 31 could be found in source package
Proxy: ccsd hal-00142991
\\ ( , 734kb)
arXiv:quant-ph/0611078 (*cross-listing*)
Date: Tue, 7 Nov 2006 17:47:43 GMT (88kb)
Date (revised v2): Wed, 21 Mar 2007 19:13:15 GMT (86kb)

Title: Stability and entanglement in optical-atomic amplification of trapped
   atoms: the role of atomic collisions
Authors: V. V. Fran\c{c}a and G. A. Prataviera
Categories: quant-ph physics.atom-ph
Comments: 6 pages, 4 figures, accepted by PRA
Journal-ref: Phys. Rev. A 75, 043604 (2007)
   Atomic collisions are included in an interacting system of optical fields and
trapped atoms allowing field amplification. We study the effects of collisions
on the system stability. Also a study of the degree of entanglement between
atomic and optical fields is made. We found that, for an atomic field initially
in a vacuum state and optical field in a coherent state, the degree of
entanglement does not depend on the optical field intensity or phase. We show
that in conditions of exponential instability the system presents at long times
two distinct stationary degree of entanglement with collisions affecting only
one of them.
\\ ( , 86kb)
replaced with revised version Thu, 11 Oct 2007 14:09:27 GMT (280kb)

Title: Manufacturing a thin wire electrostatic trap (TWIST) for ultracold polar
Authors: J. Kleinert, C. Haimberger, P. J. Zabawa, and N. P. Bigelow
Categories: physics.atom-ph
Comments: 5 pages, 8 figures, updated content
\\ ( , 280kb)

Till next time,

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
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Received on Tue Oct 30 2007 - 22:09:26 EST

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