Matt's arXiv selection: week ending 1st December 2006.

From: Matthew Davis <>
Date: Fri, 1 Dec 2006 18:01:43 +1000 (EST)

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

Early as promised for once! Twenty six new papers this week:

Paper: cond-mat/0611612
Date: Thu, 23 Nov 2006 14:13:27 GMT (544kb)

Title: Microscopic Quantum Mechanical Foundation of Fourier's Law
Authors: Mathias Michel (1), Jochen Gemmer (2), G\"unter Mahler (1) ((1)
  Institut f\"ur Theoretische Physik I, Universit\"at Stuttgart, Germany (2)
  Fachbereich Physik, Universit\"at Osnabr\"uck, Germany)
Comments: 30 pages, 10 figures, review article
Subj-class: Statistical Mechanics
Journal-ref: Int. J. Mod. Phys. B 20,4855-4883 (2006)
DOI: 10.1142/S0217979206035849
  Besides the growing interest in old concepts like temperature and entropy at
the nanoscale, theories of relaxation and transport have recently regained a
lot of attention. With the electronic circuits and computer chips getting
smaller and smaller, a fresh look should be appropriate on the equilibrium and
nonequilibrium thermodynamics at small length scales far below the
thermodynamic limit, i.e. on the theoretical understanding of original
macroscopic processes, e.g. transport of energy, heat, charge, mass,
magnetization etc. Only from the foundations of a theory its limits of
applicability may be inferred. This review tries to give an overview of the
background and recent developments in the field of nonequilibrium quantum
thermodynamics focusing on the transport of heat in small quantum systems.
\\ ( , 544kb)
Paper: cond-mat/0611620
Date: Fri, 24 Nov 2006 01:35:27 GMT (143kb)

Title: Bond algebraic liquid phase in strongly correlated multiflavor cold atom
Authors: Cenke Xu and Matthew P. A. Fisher
Comments: 15 pages, 10 figures
Subj-class: Strongly Correlated Electrons; Soft Condensed Matter
  When cold atoms are trapped in a square or cubic optical lattice, it should
be possible to pump the atoms into excited $p-$level orbitals within each well.
Following earlier work, we explore the metastable equilibrium that can be
established before the atoms decay into the $s-$wave orbital ground state. We
will discuss the situation with integer number of bosons on every site, and
consider the strong correlation "insulating" regime. By employing a spin-wave
analysis together with a new duality transformation, we establish the existence
and stability of a novel gapless "critical phase", which we refer to as a "bond
algebraic liquid". The gapless nature of this phase is stabilized due to the
emergence of symmetries which lead to a quasi-one dimensional behavior. Within
the algebraic liquid phase, both bond operators and particle flavor occupation
number operators have correlations which decay algebraically in space and time.
Upon varying parameters, the algebraic bond liquid can be unstable to either a
Mott insulator phase which spontaneously breaks lattice symmetries, or a
$\mathbb{Z}_2$ phase. The possibility of detecting the algebraic liquid phase
in cold atom experiments is addressed. Although the momentum distribution
function is insufficient to distinguish the algebraic bond liquid from other
phases, the density correlation function can in principle be used to detect
this new phase of matter.
\\ ( , 143kb)
Paper: cond-mat/0611629
Date: Fri, 24 Nov 2006 11:23:10 GMT (272kb)

Title: Experimental Evidence for Efimov Quantum States
Authors: H.-C. Naegerl, T. Kraemer, M. Mark, P. Waldburger, J. G. Danzl, B.
  Engeser, A. D. Lange, K. Pilch, A. Jaakkola, C. Chin, R. Grimm
Comments: 8 pages, 4 figures, Proceedings of ICAP-2006 (Innsbruck)
Subj-class: Other
  Three interacting particles form a system which is well known for its complex
physical behavior. A landmark theoretical result in few-body quantum physics is
Efimov's prediction of a universal set of weakly bound trimer states appearing
for three identical bosons with a resonant two-body interaction. Surprisingly,
these states even exist in the absence of a corresponding two-body bound state
and their precise nature is largely independent of the particular type of the
two-body interaction potential. Efimov's scenario has attracted great interest
in many areas of physics; an experimental test however has not been achieved.
We report the observation of an Efimov resonance in an ultracold thermal gas of
cesium atoms. The resonance occurs in the range of large negative two-body
scattering lengths and arises from the coupling of three free atoms to an
Efimov trimer. We observe its signature as a giant three-body recombination
loss when the strength of the two-body interaction is varied near a Feshbach
resonance. This resonance develops into a continuum resonance at non-zero
collision energies, and we observe a shift of the resonance position as a
function of temperature. We also report on a minimum in the recombination loss
for positive scattering lengths, indicating destructive interference of decay
pathways. Our results confirm central theoretical predictions of Efimov physics
and represent a starting point from which to explore the universal properties
of resonantly interacting few-body systems.
\\ ( , 272kb)
Paper: quant-ph/0611236
Date: Thu, 23 Nov 2006 07:57:16 GMT (353kb)

Title: First measurements of the index of refraction of gases for lithium
  atomic waves
Authors: Marion Jacquey (LCAR), Matthias B\"{u}chner (LCAR), G\'{e}rard
  Tr\'{e}nec (LCAR), Jacques Vigu\'{e} (LCAR)
Proxy: ccsd hal-00115743
  We report here the first measurements of the index of refraction of gases for
lithium waves. Using an atom interferometer, we have measured the real and
imaginary part of the index of refraction $n$ for argon, krypton and xenon, as
a function of the gas density for several velocities of the lithium beam. The
linear dependence of $(n-1)$ with the gas density is well verified. The total
collision cross-section deduced from the imaginary part is in very good
agreement with traditional measurements of this quantity. Finally, as predicted
by theory, the real and imaginary parts of $(n-1)$ and their ratio $\rho$
exhibit glory oscillations.
\\ ( , 353kb)
Paper: quant-ph/0611240
Date: Thu, 23 Nov 2006 17:14:24 GMT (141kb)

Title: Radio-frequency-dressed atoms beyond the rotating wave approximation
Authors: S. Hofferberth, B. Fischer, T. Schumm, J. Schmiedmayer, and I.
  We study atoms dressed with a strong radio-frequency field in a regime where
the rotating wave approximation (RWA) breaks down. We present a full
calculation of the atom - field coupling which shows that the non-RWA
contributions quantitatively alter the shape of the emerging dressed adiabatic
potentials. Furthermore they lead to additional allowed transitions between
dressed levels. We use RF spectroscopy of Bose-Einstein condensates trapped in
the dressed state potentials to directly observe the transition from the RWA to
the beyond-RWA regime.
\\ ( , 141kb)
Paper: quant-ph/0611246
Date: Fri, 24 Nov 2006 08:54:44 GMT (490kb)

Title: Universal Quantum Computation in a Neutral Atom Decoherence Free
Authors: E. Brion, L. H. Pedersen, K. Molmer, S. Chutia, M. Saffman
Comments: 7 pages, 8 figures
  In this paper, we propose a way to achieve protected universal computation in
a neutral atom quantum computer subject to collective dephasing. Our proposal
relies on the existence of a Decoherence Free Subspace (DFS), resulting from
symmetry properties of the errors. After briefly describing the physical system
and the error model considered, we show how to encode information into the DFS
and build a complete set of safe universal gates. Finally, we provide numerical
simulations for the fidelity of the different gates in the presence of
time-dependent phase errors and discuss their performance and practical
\\ ( , 490kb)
Paper: quant-ph/0611254
Date: Fri, 24 Nov 2006 20:29:57 GMT (310kb)

Title: Laser-noise-induced correlations and anti-correlations in
  Electromagnetically Induced Transparency
Authors: L. S. Cruz, D. Felinto, J. G. Aguirre G\'omez, M. Martinelli\inst{1},
  P. Valente, A. Lezama, and P. Nussenzveig
Comments: Accepted for publication in EPJ D
  High degrees of intensity correlation between two independent lasers were
observed after propagation through a rubidium vapor cell in which they generate
Electromagnetically Induced Transparency (EIT). As the optical field
intensities are increased, the correlation changes sign (becoming
anti-correlation). The experiment was performed in a room temperature rubidium
cell, using two diode lasers tuned to the $^{85}$Rb $D_2$ line ($\lambda =
780$nm). The cross-correlation spectral function for the pump and probe fields
is numerically obtained by modeling the temporal dynamics of both field phases
as diffusing processes. We explored the dependence of the atomic response on
the atom-field Rabi frequencies, optical detuning and Doppler width. The
results show that resonant phase-noise to amplitude-noise conversion is at the
origin of the observed signal and the change in sign for the correlation
coefficient can be explained as a consequence of the competition between EIT
and Raman resonance processes.
\\ ( , 310kb)
Paper: physics/0611237
Date: Fri, 24 Nov 2006 16:19:51 GMT (172kb)

Title: Crossover to a quasi-condensate in a weakly interacting trapped 1D Bose
Authors: Isabelle Bouchoule (LCFIO), Karen V. Kheruntsyan (ARC Centre of
  Excellence for Quantum-Atom Optics), Gora Shlyapnikov (LPTMS)
Comments: 4 pages
Proxy: ccsd hal-00116204
Subj-class: Atomic Physics
  We discuss the transition from a fully decoherent to a (quasi-)condensate
regime in a harmonically trapped weakly interacting 1D Bose gas. By using
analytic approaches and verifying them against exact numerical solutions, we
find a characteristic crossover temperature and crossover atom number that
depend on the interaction strength and the trap frequency. We then identify the
conditions for observing either an interaction-induced crossover scenario or
else a finite-size Bose-Einstein condensation phenomenon characteristic of an
\textit{ideal} trapped 1D gas.
\\ ( , 172kb)
Paper: physics/0611235
Date: Fri, 24 Nov 2006 14:38:36 GMT (410kb)

Title: Cooling of a micro-mechanical oscillator using radiation pressure
  induced dynamical back-action
Authors: A. Schliesser, P. Del Haye, N. Nooshi, K.J. Vahala, T.J. Kippenberg
Comments: accepted for publication (Phys. Rev. Lett.)
Subj-class: Optics
  Cooling of a 58 MHz micro-mechanical resonator from room temperature to 11 K
is demonstrated using cavity enhanced radiation pressure. Detuned pumping of an
optical resonance allows enhancement of the blue shifted motional sideband
(caused by the oscillator's Brownian motion) with respect to the red-shifted
sideband leading to cooling of the mechanical oscillator mode. The reported
cooling mechanism is a manifestation of the effect of radiation pressure
induced dynamical backaction. These results constitute an important step
towards achieving ground state cooling of a mechanical oscillator.
\\ ( , 410kb)
Paper: cond-mat/0611645
Date: Sun, 26 Nov 2006 23:07:13 GMT (44kb)

Title: A study of classical field techniques for condensates in one-dimensional
  rings at finite temperatures
Authors: A. Nunnenkamp, J. N. Milstein and K. Burnett
Comments: 7 pages, 7 figures
Subj-class: Other
  For a condensate in a one-dimensional ring geometry, we compare the
thermodynamic properties of three conceptually different classical field
techniques: stochastic dynamics, microcanonical molecular dynamics, and the
classical field method. Starting from non-equilibrium initial conditions, all
three methods approach steady states whose distribution and correlation
functions are in excellent agreement with an exact evaluation of the partition
function in the high-temperature limit. Our study helps to establish these
various classical field techniques as powerful non-perturbative tools for
systems at finite temperatures.
\\ ( , 44kb)
Paper: physics/0611246
Date: Sun, 26 Nov 2006 08:16:57 GMT (469kb)

Title: Optical Magnetometry
Authors: D. Budker and M. V. Romalis
Comments: 11 pages; 4 figures; submitted to Nature Physics
Subj-class: Atomic Physics; Instrumentation and Detectors
  Some of the most sensitive methods of measuring magnetic fields utilize
interactions of resonant light with atomic vapor. Recent developments in this
vibrant field are improving magnetometers in many traditional areas such as
measurement of geomagnetic anomalies and magnetic fields in space, and are
opening the door to new ones, including, dynamical measurements of bio-magnetic
fields, detection of nuclear magnetic resonance (NMR), magnetic-resonance
imaging (MRI), inertial-rotation sensing, magnetic microscopy with cold atoms,
and tests of fundamental symmetries of Nature.
\\ ( , 469kb)
Paper: physics/0611250
Date: Sun, 26 Nov 2006 20:30:20 GMT (304kb)

Title: Rubidium "whiskers" in a vapor cell
Authors: M. V. Balabas, A. O. Sushkov, and D. Budker
Comments: 2 pages, 1 figure
Subj-class: Atomic Physics; General Physics
  Crystals of metallic rubidium are observed ``growing'' from paraffin coating
of buffer-gas-free glass vapor cells. The crystals have uniform square
cross-section, $\approx 35 \mu$m on the side, and reach several mm in length.
\\ ( , 303kb)
Paper: cond-mat/0611688
Date: Mon, 27 Nov 2006 23:16:00 GMT (217kb)

Title: Decoherence of Macroscopic States at Finite Temperatures
Authors: Carlos L. Benavides and Claudia M. Ojeda
Comments: 9 pages, 3 figures
Subj-class: Mesoscopic Systems and Quantum Hall Effect
  We study the macroscopic superposition of light coherent states of the type
Schrodinger cat states; analizying, in particular, the role of the temperature
in the decoherence processes, characteristic of the superposition of
macroscopic states. The method we use here is based on the Master equation
formalism, introducing an original approach. We use a modified Mandel function
that is well adapted to the problem. This work is motivated by the experiments
proposed by S. Haroche and collaborators in the 90's. In these experiments two
Rydberg atoms were sent to a cavity in which a coherent state had been
previously injected, monitoring the decay of quantum states due to dissipation.
We find Haroche and collaborator's result at zero temperature and we predict
the behavior of the field states in the cavity at finite temperatures.
\\ ( , 217kb)
Paper: cond-mat/0611689
Date: Mon, 27 Nov 2006 22:38:45 GMT (55kb)

Title: Probing $n$-Spin Correlations in Optical Lattices
Authors: Chuanwei Zhang, V. W. Scarola, and S. Das Sarma
Comments: 5 pages, 3 figures
Subj-class: Strongly Correlated Electrons; Other
  We propose a technique to measure multi-spin correlation functions of
arbitrary range as determined by the ground states of spinful cold atoms in
optical lattices. We show that an observation of the atomic version of the
Stokes parameters, using focused lasers and microwave pulsing, can be related
to $n$-spin correlators. We discuss the possibility of detecting not only
ground state static spin correlations, but also time-dependent spin wave
dynamics as a demonstrative example using our proposed technique.
\\ ( , 55kb)
Paper: cond-mat/0611690
Date: Tue, 28 Nov 2006 18:51:35 GMT (200kb)

Title: Collective excitations and instability of an optical lattice due to
  unbalanced pumping
Authors: J. K. Asboth, H. Ritsch, P. Domokos
Comments: 5 pages, submitted to Phys. Rev. Lett
Subj-class: Other
  We solve the self-consistent, coupled equations of motion for trapped atoms
and the field of a one-dimensional optical lattice in the large detuning limit.
In steady state the refractive index of the particles reduces the lattice
constant, an effect, which is greatly enhanced if the lattice is formed by
unbalanced pump beams. For pump asymmetry above a finite value, independent of
the lattice size, no equilibrium configuration exists. Below this limit, the
optomechanical coupling mediates collective oscillations of the particles
around their steady state positions, which for asymmetric pumping take the form
of traveling density waves. Above an asymmetry threshold, which decreases with
the lattice size, these waves are amplified and the equilibrium becomes
unstable, even in the presence of arbitrarily large viscous damping.
\\ ( , 200kb)
Paper: cond-mat/0611699
Date: Tue, 28 Nov 2006 06:49:00 GMT (62kb)

Title: Emergence of Wigner molecules in one-dimensional systems of repulsive
  fermions under harmonic confinement
Authors: S.H. Abedinpour, M. Polini, Gao Xianlong, and M.P. Tosi
Comments: 3 pages, 2 figures, submitted
Subj-class: Strongly Correlated Electrons
  A Bethe-Ansatz spin-density functional approach is developed to evaluate the
ground-state density profile in a system of repulsively interacting spin-1/2
fermions inside a quasi-one-dimensional harmonic well. The approach allows for
the formation of antiferromagnetic quasi-order with increasing coupling
strength and reproduces with high accuracy the exact solution that is available
for the two-fermion system.
\\ ( , 62kb)
Paper: cond-mat/0611710
Date: Tue, 28 Nov 2006 12:30:02 GMT (40kb)

Title: Superfluid - Bose glass transition in two dimensions at T = 0: analytic
  solution of a mode-coupling toy model
Authors: E.V. Zenkov
Comments: 5 pages, 2 figures
Subj-class: Strongly Correlated Electrons
Journal-ref: Europhys.Lett. 69, 390-396 (2005)
  Analytic expression for the memory function and the optical conductivity of
the two-dimensional Bose gas with logarithmic interaction at T = 0 in presence
of point-like impurities is obtained within the mode-coupling approximation.
Depending on the value of a dimensionless combination of the model parameters
proportional to the strength of the impurity potential, two different phases
are distinguished, viz. the disordered superfluid and insulator (Bose glass),
separated by an intermediate (quasi)metal state.
\\ ( , 40kb)
Paper: cond-mat/0611711
Date: Tue, 28 Nov 2006 12:40:12 GMT (159kb)

Title: Optical conductivity of Bose droplets in quenched disorder at T = 0: the
  effects of structure factor
Authors: E.V. Zenkov
Comments: 7 pages, 7 figures
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
  The optical response of a system of two-dimensional Bose condensate droplets
with an internal charge structure interacting with impurities is considered
within the mode-coupling theory. It is found, that the glass transition in the
system of droplets occurs at much stronger disorder as compared to the case of
stuctureless point particles. The optical conductivity of the system is found
to exhibit a complex oscillating structure, intimately related to the charge
distribution within the droplets. The application of the model to the problem
of the far IR optical conductivity of doped cuprates (in particular, La214) is
\\ ( , 159kb)
Paper: physics/0611280
Date: Tue, 28 Nov 2006 20:17:25 GMT (104kb)

Title: Dipole-dipole instability of atom clouds in a far-detuned optical dipole
Authors: D. Nagy and P. Domokos
Comments: 8 pages, 4 figures
Subj-class: Atomic Physics; Optics
  The effect of the dipole-dipole interaction on the far-off-resonance optical
dipole trapping scheme is calculated by a mean-field approach. The trapping
laser field polarizes the atoms and the accompanying dipole-dipole energy shift
deepens the attractive potential minimum in a pancake-shaped cloud. At high
density the thermal motion cannot stabilize the gas against self-contraction
and an instability occurs. We calculate the boundary of the stable and unstable
equilibrium regions on a two-dimensional phase diagram of the atom number and
the ratio of the trap depth to the temperature.
\\ ( , 104kb)
Paper: cond-mat/0611725
Date: Tue, 28 Nov 2006 21:00:07 GMT (182kb)

Title: Supersolid of Hardcore Bosons on the Face Centered Cubic Lattice
Authors: Takahumi Suzuki and Naoki Kawashima
Comments: 4pages, 5figures
Subj-class: Superconductivity
  We investigate a supersolid state in hardcore boson models on the
face-centered-cubic (FCC) lattice. The supersolid state is characterized by a
coexistence of crystalline order and superfluidity. Using a quantum Monte Carlo
method based on the directed-loop algorithm, we calculate static structure
factors and superfluid density at finite temperature, from which we obtain the
phase diagram. The supersolid phase exists at intermediate fillings between a
three-quarter-filled solid phase and a half-filled solid phase. We also discuss
the mechanism of the supersolid state on the FCC lattice.
\\ ( , 182kb)
Paper: cond-mat/0611734
Date: Wed, 29 Nov 2006 08:52:24 GMT (253kb)

Title: Irregular Spin Tunnelling for Spin-1 Bose-Einstein Condensates in a
  Sweeping Magnetic Field
Authors: Guan-Fang Wang, Li-Bin Fu and Jie Liu
Comments: 8 pages, 15 figures
Subj-class: Mesoscopic Systems and Quantum Hall Effect
  We investigate the spin tunnelling of spin-1 Bose-Einstein condensates in a
linearly sweeping magnetic field with a mean-field treatment. We focus on the
two typical alkali Bose atoms $^{87}Rb$ and $^{23}Na$ condensates and study
their tunnelling dynamics according to different sweeping rates of external
magnetic fields. In the adiabatic (i.e., slowly sweeping) and sudden (i.e.,
fast sweeping) limits, no tunnelling is observed. For the case of moderate
sweeping rates, the tunnelling dynamics is found to be very sensitive on the
sweeping rates with showing a chaotic-like tunnelling regime. With magnifying
the regime, however, we find interestedly that the plottings become resolvable
under a resolution of $10^{-4}$ G/s where the tunnelling probability with
respect to the sweeping rate shows a regular periodic-like pattern. Moreover, a
conserved quantity standing for the magnetization in experiments is found can
dramatically affect the above picture of the spin tunnelling. Theoretically we
have given a reasonable interpretation to the above findings and hope our
studies would bring more attention to spin tunnelling experimentally.
\\ ( , 253kb)
Paper: cond-mat/0611740
Date: Wed, 29 Nov 2006 11:19:34 GMT (384kb)

Title: Josephson probe of Fulde-Ferrell-Larkin-Ovchinnikov phases in atomic
  Fermi gases
Authors: Hui Hu & Xia-Ji Liu
Comments: 5 pages, 4 figures
Subj-class: Superconductivity; Strongly Correlated Electrons
  We study two spatially separate one-dimensional atomic Fermi gases in a
double-well trap. A Josephson junction between a
Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid and a
Bardeen-Cooper-Schrieffer superfluid could be realized by creating a weak link
at a given position and by tuning independently the spin polarization of gases
in each well. Owing to the proportionality between the Josephson current and
order parameters, the spatial inhomogeneity of the FFLO order parameter can be
directly revealed through current measurement at different positions of the
link. Thus, the Josephson effect provides definitive evidence for the existence
of FFLO phases.
\\ ( , 384kb)
Paper: cond-mat/0611758
Date: Wed, 29 Nov 2006 20:48:12 GMT (954kb)

Title: Negative Echo in the Density Evolution of Ultracold Fermionic Gases
Authors: F. Fumarola, Y. Ahmadian, I.L. Aleiner and B.L. Altshuler
Comments: 4 pages, 2 figures
Subj-class: Superconductivity
  We predict a nonequilibrium critical phenomenon in the space-time density
evolution of a fermionic gas above the temperature of transition into the
superfluid phase. On the BCS side of the BEC-BCS crossover, the evolution of a
localized density disturbance exhibits a negative echo at the point of the
initial inhomogeneity. Approaching the BEC side, this effect competes with the
slow spreading of the density of bosonic molecules. However, even here the echo
dominates for large enough times. This effect may be used as an experimental
tool to locate the position of the transition.
\\ ( , 954kb)
Paper: physics/0611284
Date: Wed, 29 Nov 2006 08:24:27 GMT (119kb)

Title: Using time dependent citation rates (sales curves) for comparing
  scientific impacts
Authors: Werner Marx, Hermann Schier, Ole Krogh Andersen
Comments: 9 pages, 3 figures, 1 table
Subj-class: Physics and Society
  As a simple means for comparing and - if possible - predicting scientific
impacts of different researchers working in the same field, we suggest
comparing their "sales curves". A sales curve is the number of citations of the
researcher's papers per year, the citation rate, considered as a function of
time. As examples, we present the citation histories of 10 older well-cited
scientists working in the same field. The sales curve is found to be highly
individual, that is, there is a large variation between different scientists'
sales curves. For each well-cited scientist, however, the sales curve is
steadily increasing as long as he is young and active, and its slope, the
citation acceleration, contains the essential information about his impact. The
slope averaged over the time of activity of the scientist is roughly
independent of time and is a fairly age-independent measure of his scientific
impact. In physics and chemistry, well-cited active scientists have
time-averaged citation accelerations at the order of 10 citations per year^2 or
more. The normal citation acceleration is an order of magnitude smaller. We
also show the sales curves for three large research institutes whose sizes have
been fairly constant over the last 35 years. These sales curves are quite
linear and have slopes at the order of 1 citation per scientist per year^2.
\\ ( , 119kb)
Paper: cond-mat/0611769
Date: Thu, 30 Nov 2006 13:55:46 GMT (92kb)

Title: Effective Range Corrections to Three-Body Recombination for Atoms with
  Large Scattering Length
Authors: H.-W. Hammer, Timo A. Lahde, L. Platter
Comments: 6 pages, 2 figures
Report-no: HISKP-TH-06/38, NT_at_UW-06-29
Subj-class: Other
  Few-body systems with large scattering length a have universal properties
that do not depend on the details of their interactions at short distances. The
rate constant for three-body recombination of bosonic atoms of mass m into a
shallow dimer scales as \hbar a^4/m times a log-periodic function of the
scattering length. We calculate the leading and subleading corrections to the
rate constant which are due to the effective range of the atoms and study the
correlation between the rate constant and the atom-dimer scattering length. Our
results are applied to 4He atoms as a test case.
\\ ( , 92kb)
Paper: physics/0611302
Date: Thu, 30 Nov 2006 18:17:44 GMT (200kb)

Title: Controllable 3D atomic Brownian motor in optical lattices
Authors: Claude M. Dion, Peder Sjolund, Stefan J. H. Petra, Svante Jonsell,
  Mats Nylen, Laurent Sanchez-Palencia, and Anders Kastberg
Comments: 7 pages, 4 figures. Presented at the conference "Theoretical and
  Experimental Foundations of Recent Quantum Technologies" (Durban, South
Subj-class: Atomic Physics
  We study a Brownian motor, based on cold atoms in optical lattices, where
atomic motion can be induced in a controlled manner in an arbitrary direction,
by rectification of isotropic random fluctuations. In contrast with ratchet
mechanisms, our Brownian motor operates in a potential that is spatially and
temporally symmetric, in apparent contradiction to the Curie principle.
Simulations, based on the Fokker-Planck equation, allow us to gain knowledge on
the qualitative behaviour of our Brownian motor. Studies of Brownian motors,
and in particular ones with unique control properties, are of fundamental
interest because of the role they play in protein motors and their potential
applications in nanotechnology. In particular, our system opens the way to the
study of quantum Brownian motors.
\\ ( , 200kb)

The replacements:

Paper: cond-mat/0604424
replaced with revised version Fri, 24 Nov 2006 15:17:48 GMT (242kb)

Title: Non-BCS superfluidity in trapped ultracold Fermi gases
Authors: L. M. Jensen, J. Kinnunen, and P. Torma
Comments: Thoroughly revised
Subj-class: Strongly Correlated Electrons; Other
\\ ( , 242kb)
Paper: cond-mat/0606330
replaced with revised version Thu, 23 Nov 2006 09:59:32 GMT (623kb)

Title: Sarma Phase in Trapped Unbalanced Fermi Gases
Authors: K. B. Gubbels, M. W. J. Romans, and H. T. C. Stoof
Comments: Replaced with published version; 4 pages, 3 figures
Subj-class: Statistical Mechanics
Journal-ref: Phys. Rev. Lett. 97, 210402 (2006)
\\ ( , 623kb)
Paper: cond-mat/0610675
replaced with revised version Thu, 23 Nov 2006 08:33:01 GMT (244kb)

Title: Exact treatment of trapped imbalanced fermions in the BEC limit
Authors: P. Pieri, G.C. Strinati
Comments: 18 pages, 10 figures, Proceedings of the International School of
  Physics "Enrico Fermi" - Course CLXIV "Ultra-Cold Fermi Gases", Varenna, June
  2006; added references
Subj-class: Superconductivity; Other
\\ ( , 244kb)
Paper: quant-ph/0609236
replaced with revised version Thu, 23 Nov 2006 20:23:21 GMT (263kb)

Title: A fast and robust approach to long-distance quantum communication with
  atomic ensembles
Authors: L. Jiang, J. M. Taylor, M. D. Lukin
Comments: 6 pages, 4 figures, 3 tables
\\ ( , 263kb)
Paper: quant-ph/0610071
replaced with revised version Thu, 23 Nov 2006 14:22:54 GMT (272kb)

Title: Diffraction limited optics for single atom manipulation
Authors: Y.R.P. Sortais, H. Marion, C. Tuchendler, A.M. Lance, M. Lamare, P.
  Fournet, C. Armellin, R. Mercier, G. Messin, A. Browaeys and P. Grangier
Comments: 8 pages, 9 figures; typos corrected and references added
\\ ( , 272kb)
Paper: physics/0605028
replaced with revised version Fri, 24 Nov 2006 07:05:34 GMT (281kb)

Title: Effect of Magnetization Inhomogeneity on Magnetic Microtraps for Atoms
Authors: S. Whitlock, B. V. Hall, T. Roach, R. Anderson, P. Hannaford and A. I.
Comments: 4 pages, 4 figures
Subj-class: Atomic Physics
\\ ( , 281kb)
Paper: cond-mat/0511080
replaced with revised version Sat, 25 Nov 2006 15:08:09 GMT (459kb)

Title: Probing number squeezing of ultracold atoms across the superfluid-Mott
  insulator transition
Authors: Fabrice Gerbier, Simon Foelling, Artur Widera, Olaf Mandel, Immanuel
Comments: 4 pages; 4 figures
Subj-class: Other
Journal-ref: Phys. Rev. Lett. 96, 090401 (2006)
\\ ( , 459kb)
Paper: cond-mat/0611171
replaced with revised version Mon, 27 Nov 2006 06:37:12 GMT (19kb)

Title: Symmetry and inert states of spin Bose Condensates
Authors: S.-K. Yip
Comments: an error in Sec III C corrected
Subj-class: Superconductivity
\\ ( , 19kb)
Paper: quant-ph/0611093
replaced with revised version Mon, 27 Nov 2006 15:32:38 GMT (642kb)

Title: Quantum processing photonic states in optical lattices
Authors: Christine A. Muschik, Ines de Vega, Diego Porras, J. Ignacio Cirac
\\ ( , 642kb)
Paper: cond-mat/0610644
replaced with revised version Tue, 28 Nov 2006 00:49:00 GMT (175kb)

Title: Non-diffusive phase spreading of a Bose-Einstein condensate at finite
Authors: Alice Sinatra (LKB - Lhomond), Yvan Castin (LKB - Lhomond), Emilia
Comments: 14 pages, 7 figures
Proxy: ccsd hal-00109021
Subj-class: Other
\\ ( , 175kb)
Paper: cond-mat/0611386
replaced with revised version Tue, 28 Nov 2006 17:38:35 GMT (41kb)

Title: Topological defects, "magnetic charges" and coherence in dipolar
  excitonic condensates
Authors: Egor Babaev
Comments: v2: important references added
Subj-class: Superconductivity; Mesoscopic Systems and Quantum Hall Effect
\\ ( , 41kb)
Paper: cond-mat/0605413
replaced with revised version Wed, 29 Nov 2006 10:22:41 GMT (26kb)

Title: Collective mode damping and viscosity in a 1D unitary Fermi gas
Authors: M. Punk, W. Zwerger
Comments: 9 pages, 3 figures, published version (minor changes)
Subj-class: Statistical Mechanics; Superconductivity
Journal-ref: New J. Phys. 8 (2006) 168
\\ ( , 26kb)
Paper: cond-mat/0609036
replaced with revised version Wed, 29 Nov 2006 09:07:09 GMT (148kb)

Title: Smoothing effect and delocalization of interacting Bose-Einstein
  condensates in random potentials
Authors: Laurent Sanchez-Palencia (LCFIO)
Comments: To appear in Phys. Rev. A; The word "screening" has been changed to
  "smoothing" to avoid confusions with other effects discussed in the
  literature. This does not affect the content of paper, nor the results, nor
  the physical discussion
Proxy: ccsd ccsd-00090760
Subj-class: Other
\\ ( , 148kb)

Next week may be a little late: till then,

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
Legal stuff: Unless stated otherwise, this e-mail represents only the
views of the sender and not the views of the University of Queensland
Received on Fri Dec 01 2006 - 18:01:43 EST

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