# Matt's arXiv selection: week ending 16 February 2007.

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Sat, 24 Feb 2007 16:26:48 +1000 (EST)

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

Hi all, late once again I'm afraid.

A total of 23 new abstracts, and 7 replacements.

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Paper: cond-mat/0702241
Date: Fri, 9 Feb 2007 13:54:03 GMT (79kb)

Title: Coherently controlled entanglement generation in a binary Bose-Einstein
condensate
Authors: Niklas Teichmann (OLDENBURG), Christoph Weiss (LKB - Lhomond)
Categories: cond-mat.other
Comments: 6 pages, 6 figures, epl2.cls
Proxy: ccsd hal-00130144
Subj-class: Other
\\
Considering a two-component Bose-Einstein condensate in a double-well
potential, a method to generate a Bell state consisting of two spatially
separated condensates is suggested. For repulsive interactions, the required
tunnelling control is achieved numerically by varying the amplitude of a
sinusoidal potential difference between the wells. Both numerical and
analytical calculations reveal the emergence of a highly entangled mesoscopic
state.
\\ ( http://arXiv.org/abs/cond-mat/0702241 , 79kb)
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Paper: quant-ph/0702085
Date: Fri, 9 Feb 2007 07:37:21 GMT (342kb)

Title: Coherent manipulation of atomic qubits in optical micropotentials
Authors: A. Lengwenus, J. Kruse, M. Volk, W. Ertmer, G. Birkl
Categories: quant-ph
Comments: to be published in Appl. Phys. B
DOI: 10.1007/s00340-006-2539-9
\\
We experimentally demonstrate the coherent manipulation of atomic states in
far-detuned dipole traps and registers of dipole traps based on two-dimensional
arrays of microlenses. By applying Rabi, Ramsey, and spin-echo techniques, we
systematically investigate the dephasing mechanisms and determine the coherence
time. Simultaneous Ramsey measurements in up to 16 dipole traps are performed
and proves the scalability of our approach. This represents an important step
in the application of scalable registers of atomic qubits for quantum
information processing. In addition, this system can serve as the basis for
novel atomic clocks making use of the parallel operation of a large number of
individual clocks each remaining separately addressable.
\\ ( http://arXiv.org/abs/quant-ph/0702085 , 342kb)
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Paper: quant-ph/0702087
Date: Fri, 9 Feb 2007 09:36:03 GMT (233kb)

Title: Light force fluctuations in a strongly coupled atom-cavity system
Authors: T. Puppe, I. Schuster, P. Maunz, K. Murr, P.W.H. Pinkse, G. Rempe
\\
Between mirrors, the density of electromagnetic modes differs from the one in
free space. This changes the radiation properties of an atom as well as the
light forces acting on an atom. It has profound consequences in the
strong-coupling regime of cavity quantum electrodynamics. For a single atom
trapped inside the cavity, we investigate the atom-cavity system by scanning
the frequency of a probe laser for various atom-cavity detunings. The avoided
crossing between atom and cavity resonance is visible in the transmission of
the cavity. It is also visible in the loss rate of the atom from the
intracavity dipole trap. On the normal-mode resonances, the dominant
contribution to the loss rate originates from dipole-force fluctuations which
are dramatically enhanced in the cavity. This conclusion is supported by
Monte-Carlo simulations.
\\ ( http://arXiv.org/abs/quant-ph/0702087 , 233kb)
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Paper: cond-mat/0702266
Date: Sat, 10 Feb 2007 21:14:25 GMT (136kb)

Title: Strongly Correlated States of Ultracold Rotating Dipolar Fermi Gases
Authors: Klaus Osterloh, Nuria Barber\'{a}n, and Maciej Lewenstein
Categories: cond-mat.str-el cond-mat.mes-hall
Comments: 5 pages, 5 figures, paper presented at DPG Meeting 2006, as well as
Fritz Haber Institute Colloquium
Subj-class: Strongly Correlated Electrons; Mesoscopic Systems and Quantum Hall
Effect
\\
We study strongly correlated ground and excited states of rotating quasi-2D
Fermi gases constituted of a small number of dipole-dipole interacting
particles with dipole moments polarized perpendicular to the plane of motion.
As the number of atoms grows, the system enters {\it an intermediate regime},
where ground states are subject to a competition between distinct bulk-edge
configurations. This effect obscures their description in terms of composite
fermions and leads to the appearance of novel composite fermion quasi-hole
states. In the presence of dipolar interactions, the principal Laughlin state
at filling $\nu=1/3$ exhibits a substantial energy gap for neutral (total
angular momentum conserving) excitations, and is well-described as an
incompressible Fermi liquid. Instead, at lower fillings, the ground state
structure favors crystalline order.
\\ ( http://arXiv.org/abs/cond-mat/0702266 , 136kb)
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Paper: cond-mat/0702269
Date: Sun, 11 Feb 2007 17:42:14 GMT (424kb)

Title: Off-diagonal long-range order, cycle probabilities, and condensate
fraction in the ideal Bose gas
Authors: Maguelonne Chevallier, Werner Krauth
Categories: cond-mat.stat-mech
Subj-class: Statistical Mechanics
\\
We discuss the relationship between the cycle probabilities in the
path-integral representation of the ideal Bose gas, the off-diagonal long-range
order, and Bose-Einstein condensation. Starting from the recursion relation for
the canonic partition functions, we prove in an elementary yet rigorous way
that in a box of size L^3 the sum of the cycle probabilities of length k >
const L^2 equals the off-diagonal long-range order parameter in the
thermodynamic limit. We then discuss another relation between the cycle
statistics and the Bose-Einstein condensation that holds in finite or infinite
systems: the integer derivative of the cycle probabilities is proportional to
the sum over $\sigma$ of the probability of having exactly k bosons in the
single-particle state $\sigma$. It gives, for large k, the probability of
having k bosons in the groundstate. For small k it accounts for the
condensation into excited states.
\\ ( http://arXiv.org/abs/cond-mat/0702269 , 424kb)
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Paper: cond-mat/0702277
Date: Mon, 12 Feb 2007 13:03:53 GMT (512kb)

Title: Fermi-Bose mixture with tunable interactions
Authors: Giovanni Modugno
Categories: cond-mat.other
Comments: 20 pages, Proceedings of the International School of Physics "Enrico
Fermi" - Course CLXIV "Ultra-Cold Fermi Gases", Varenna, June 2006
Subj-class: Other
\\
We give an overview of recent experiments on an ultracold Fermi-Bose quantum
gas where the interspecies interaction can be tuned via magnetic Feshbach
resonances. We first describe the various steps that have led to the
observation of Feshbach resonances in the K-Rb system we investigate, and their
accurate characterization. We then describe experiments in which Feshbach
resonances are exploited to study interaction effects and to associate weakly
bound KRb dimers.
\\ ( http://arXiv.org/abs/cond-mat/0702277 , 512kb)
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Paper: cond-mat/0702281
Date: Mon, 12 Feb 2007 19:40:35 GMT (50kb)

Title: Finite-well potential in the 3D nonlinear Schroedinger equation:
Application to Bose-Einstein condensation
Categories: cond-mat.other
Subj-class: Other
\\
Using variational and numerical solutions we show that stationary
negative-energy localized (normalizable) bound states can appear in the
three-dimensional nonlinear Schr\"odinger equation with a finite square-well
potential for a range of nonlinearity parameters. Below a critical attractive
nonlinearity, the system becomes unstable and experiences collapse. Above a
limiting repulsive nonlinearity, the system becomes highly repulsive and cannot
be bound. The system also allows nonnormalizable states of infinite norm at
positive energies in the continuum. The normalizable negative-energy bound
states could be created in BECs and studied in the laboratory with present
knowhow.
\\ ( http://arXiv.org/abs/cond-mat/0702281 , 50kb)
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Paper: cond-mat/0702290
Date: Mon, 12 Feb 2007 21:54:01 GMT (34kb)

Title: New Calculations of Recombination Rates for Cold $^4$He Atoms and
Determination of Universal Scaling Functions
Authors: J.R.Shepard
Categories: cond-mat.other
Subj-class: Other
\\
Three-body recombination rates for cold $^4$He are calculated with a new
method which exploits the simple relationship between the imaginary part of the
atom-dimer elastic scattering phase shift and the $S$-matrix for recombination.
The elastic phase shifts are computed above breakup threshold by solving a
three-body Faddeev equation in momentum space with inputs based on a variety of
modern atom-atom potentials. Recombination coefficients for the HFD-B3-FCII
potential agree very well with the only previously published results. Since the
elastic scattering and recombination processes for $^4$He are governed by
"Efimov physics", they depend on universal functions of a scaling variable. The
newly computed recombination coefficients for potentials other than HFD-B3-FCII
make it possible to determine these universal functions for the first time.
\\ ( http://arXiv.org/abs/cond-mat/0702290 , 34kb)
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Paper: cond-mat/0702313
Date: Tue, 13 Feb 2007 16:43:05 GMT (106kb)

Title: A proposal for measuring correlation functions in interacting gases
Authors: C. Lobo, S. D. Gensemer
Categories: cond-mat.other
Subj-class: Other
\\
We propose an experimental method that allows for scaling of all the diagonal
correlation functions (such as the density and pair correlation function)
during the expansion of harmonically trapped cold atomic gases with arbitrary
interactions even if the trapping is anisotropic. To do this we require that
the interaction be tunable by the use of a Feshbach resonance and that the
trapping potential can be manipulated independently along the axial and radial
directions. This permits a much greater accuracy and resolution in measurements
of correlation functions. We explain the explicit control procedure, outline
the scaling ansatz that we use and briefly discuss the systems where it could
be applied as well as possible experimental obstacles to its implementation.
\\ ( http://arXiv.org/abs/cond-mat/0702313 , 106kb)
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Paper: cond-mat/0702314
Date: Tue, 13 Feb 2007 17:08:40 GMT (54kb)

Title: Normal state of highly polarized Fermi gases: simple many-body
approaches
Authors: R. Combescot, A. Recati, C. Lobo, F. Chevy
Categories: xcond-mat.stat-mech
Subj-class: Statistical Mechanics
\\
We consider the problem of a single \down atom in the presence of a Fermi sea
of \up atoms, in the vicinity of a Feshbach resonance. We calculate the
chemical potential and the effective mass of the \down atom using two simple
approaches: a many-body variational wave function and a T-matrix approximation.
These two methods lead to the same results and are in good agreement with
existing quantum Monte-Carlo calculations performed at unitarity and, in one
dimension, with the known exact solution. Surprisingly, our results suggest
that, even at unitarity, the effect of interactions is fairly weak and can be
accurately described using single particle-hole excitations. We also consider
the case of unequal masses.
\\ ( http://arXiv.org/abs/cond-mat/0702314 , 54kb)
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Paper: cond-mat/0702315
Date: Tue, 13 Feb 2007 20:38:50 GMT (17kb)

Title: Interacting bosons in an optical lattice: BEC and Mott insulator
Authors: O. Fialko, Ch. Moseley and K. Ziegler
Categories: cond-mat.stat-mech
Subj-class: Statistical Mechanics
\\
A dense Bose gas with hard-core interaction is considered in an optical
lattice. We study the phase diagram in terms of a special mean-field theory
that describes a Bose-Einstein condensate and a Mott insulator with a single
particle per lattice site for zero as well as for non-zero temperatures. We
calculate the densities, the excitation spectrum and the static structure
factor for each of these phases.
\\ ( http://arXiv.org/abs/cond-mat/0702315 , 17kb)
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Paper: cond-mat/0702318
Date: Tue, 13 Feb 2007 18:20:22 GMT (10kb)

Title: Breathing modes of a fast rotating Fermi gas
Authors: Mauro Antezza, Marco Cozzini, Sandro Stringari
Categories: cond-mat.stat-mech
Subj-class: Statistical Mechanics
\\
We derive the frequency spectrum of the lowest compressional oscillations of
a 3D harmonically trapped Fermi superfluid in the presence of a vortex lattice,
treated in the diffused vorticity approximation within a hydrodynamic approach.
We consider the general case of a superfluid at T=0 characterized by a
polytropic equation of state ($\sim{n}^\gamma$), which includes both the
Bose-Einstein condensed regime of dimers ($\gamma=1$) and the unitary limit of
infinite scattering length ($\gamma=2/3$). Important limiting cases are
considered, including the centrifugal limit, the isotropic trapping and the
cigar geometry. The conditions required to enter the lowest Landau level and
quantum Hall regimes at unitarity are also discussed.
\\ ( http://arXiv.org/abs/cond-mat/0702318 , 10kb)
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Paper: quant-ph/0702120
Date: Tue, 13 Feb 2007 02:25:45 GMT (242kb)

Title: Sideband cooling while preserving coherences in the nuclear spin state
in alkaline-earth-like atoms
Authors: Iris Reichenbach and Ivan H. Deutsch
Categories: quant-ph
\\
We propose a method for laser cooling alkaline-earth-like atoms without
changing the quantum state of their nuclear spins, thus preserving coherences
that are usually destroyed by optical pumping. As alkaline-earth-like atoms
have a $^1S_0$ closed-shell ground state, nuclear spin and electronic degrees
of freedom are decoupled, allowing for independent manipulation. The hyperfine
interaction that couples these degrees of freedom in excited states can be
suppressed through the application of external magnetic fields. Our protocol
employs resolved-sideband cooling on the forbidden clock transition, $^1S_0 \to {}^3P_0$, with quenching via coupling to the rapidly decaying $^1P_1$ state,
deep in the Paschen-Back regime. This makes it possible to laser-cool neutral
atomic qubits without destroying the quantum information stored in their
nuclear spins. The cooling scheme is analyzed based on two examples, $^{171}$Yb
and $^{87}$Sr.
\\ ( http://arXiv.org/abs/quant-ph/0702120 , 242kb)
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Paper: quant-ph/0702125
Date: Tue, 13 Feb 2007 12:28:13 GMT (182kb)

Title: Probing quantum phases of ultracold atoms in optical lattices by
transmission spectra in cavity QED
Authors: Igor. B. Mekhov, Christoph Maschler, Helmut Ritsch
Categories: quant-ph
\\
Studies of ultracold atoms in optical lattices link various disciplines,
providing a playground where fundamental quantum many-body concepts, formulated
in condensed-matter physics, can be tested in much better controllable atomic
systems, e.g., strongly correlated phases, quantum information processing.
Standard methods to measure quantum properties of Bose-Einstein condensates
(BECs) are based on matter-wave interference between atoms released from traps
which destroys the system. Here we propose a nondestructive method based on
optical measurements, and prove that atomic statistics can be mapped on
transmission spectra of a high-Q cavity. This can be extremely useful for
studying phase transitions between Mott insulator and superfluid states, since
various phases show qualitatively distinct light scattering. Joining the
paradigms of cavity quantum electrodynamics (QED) and ultracold gases will
enable conceptually new investigations of both light and matter at ultimate
quantum levels, which only recently became experimentally possible. Here we
predict effects accessible in such novel setups.
\\ ( http://arXiv.org/abs/quant-ph/0702125 , 182kb)
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Paper: quant-ph/0702132
Date: Tue, 13 Feb 2007 19:53:03 GMT (419kb)

Title: Calibration of a single atom detector for atomic micro chips
Authors: A. Stibor, S. Kraft, T. Campey, D. Komma, A. G\"unther, J. Fort\'agh,
C. J. Vale, H. Rubinsztein-Dunlop, and C. Zimmermann
Categories: quant-ph
\\
We experimentally investigate a scheme for detecting single atoms
magnetically trapped on an atom chip. The detector is based on the
photoionization of atoms and the subsequent detection of the generated ions. We
describe the characterization of the ion detector with emphasis on its
calibration via the correlation of ions with simultaneously generated
electrons. A detection efficiency of 47.8% (+-2.6%) is measured, which is
useful for single atom detection, and close to the limit allowing atom counting
with sub-Poissonian uncertainty.
\\ ( http://arXiv.org/abs/quant-ph/0702132 , 419kb)
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Paper: cond-mat/0702330
Date: Wed, 14 Feb 2007 14:28:49 GMT (842kb)

Title: Mixed symmetry localized modes and breathers in binary mixtures of
Bose-Einstein condensates in optical lattices
Authors: H. A. Cruz, V. A. Brazhnyi, V. V. Konotop, G. L. Alfimov, and M.
Salerno
Categories: cond-mat.other
Subj-class: Other
\\
We study localized modes in binary mixtures of Bose-Einstein condensates
embedded in one-dimensional optical lattices. We report a diversity of
asymmetric modes and investigate their dynamics. We concentrate on the cases
where one of the components is dominant, i.e. has much larger number of atoms
than the other one, and where both components have the numbers of atoms of the
same order but different symmetries. In the first case we propose a method of
systematic obtaining the modes, considering the "small" component as
bifurcating from the continuum spectrum. A generalization of this approach
combined with the use of the symmetry of the coupled Gross-Pitaevskii equations
allows obtaining breather modes, which are also presented.
\\ ( http://arXiv.org/abs/cond-mat/0702330 , 842kb)
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Paper: cond-mat/0702337
Date: Wed, 14 Feb 2007 16:06:34 GMT (347kb)

Title: Formation of bright solitons and soliton trains in a fermion-fermion
mixture by modulational instability
Categories: cond-mat.other
Subj-class: Other
\\
We employ a time-dependent mean-field-hydrodynamic model to study the
generation of bright solitons in a degenerate fermion-fermion mixture in a
cigar-shaped geometry using variational and numerical methods. Due to a strong
Pauli-blocking repulsion among identical spin-polarized fermions at short
distances there cannot be bright solitons for repulsive interspecies
interactions. Employing a linear stability analysis we demonstrate the
formation of stable solitons due to modulational instability of a
constant-amplitude solution of the model equations for a sufficiently
attractive interspecies interaction. We perform a numerical stability analysis
of these solitons and also demonstrate the formation of soliton trains by
jumping the effective interspecies interaction from repulsive to attractive.
These fermionic solitons can be formed and studied in laboratory with present
technology.
\\ ( http://arXiv.org/abs/cond-mat/0702337 , 347kb)
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Paper: quant-ph/0702109
Date: Mon, 12 Feb 2007 14:36:31 GMT (60kb)
Date (revised v2): Wed, 14 Feb 2007 14:21:19 GMT (60kb)

Title: Vector Cooper Pairs and CPT-like States in Ensemble of Interacting
Fermions
Authors: A.V. Taichenachev and V.I. Yudin
Categories: quant-ph cond-mat.str-el cond-mat.supr-con physics.atom-ph
Comments: revtex, 10 pages, 2 figures
Subj-class: Quantum Physics; Superconductivity; Atomic Physics; Strongly
Correlated Electrons
\\
Using the standard Hamiltonian of the BCS theory, we show that in an ensemble
of interacting fermions with the spin 1/2 there exist coherent states |NC>,
which nullify the Hamiltonian of the interparticle interaction. These states
have an analogy with the well-known in quantum optics coherent population
trapping effect. The structure of these CPT-like states corresponds to Cooper
pairs with the total spin S=1. The found states have a huge degree of
degeneracy and carry a macroscopic magnetic moment, that allows us to describe
(in the framework of the standard mathematical BCS model) a new approach to the
magnetism connected with the delocalized electrons in metals (conductors). A
principal possibility to apply the obtained results to the superfluid 3He is
also demonstrated.
\\ ( http://arXiv.org/abs/quant-ph/0702109 , 60kb)
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Paper: physics/0702119
Date: Wed, 14 Feb 2007 18:50:16 GMT (670kb)

Title: Trapping of Rb atoms by AC electric fields
Authors: Sophie Schlunk, Adela Marian, Peter Geng, Allard P. Mosk, Gerard
Meijer, and Wieland Schoellkopf
Categories: physics.atom-ph
Subj-class: Atomic Physics
\\
We demonstrate trapping of an ultracold gas of neutral atoms in a macroscopic
AC electric trap. Three-dimensional confinement is obtained by switching
between two saddle-point configurations of the electric field. Stable trapping
is observed in a narrow range of switching frequencies around 60 Hz. The
dynamic confinement of the atoms is directly visualized at different phases of
the AC switching cycle. We observe about 10^5 Rb atoms in the 1 mm^3 large and
several microkelvin deep trap with a lifetime of approximately 5 s.
\\ ( http://arXiv.org/abs/physics/0702119 , 670kb)
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Paper: physics/0702118
Date: Wed, 14 Feb 2007 18:46:11 GMT (22kb)

Title: Science Citation Index data: Two additional reasons against its use for
Authors: J. Marvin Herndon
Categories: physics.ed-ph physics.soc-ph
Comments: Accepted for publication in Current Science
Subj-class: Physics Education; Physics and Society
\\
First, for decades the use of anonymity in reviews for science funding
proposals and for evaluating manuscripts for publication has been gradually
corrupting American science, encouraging and rewarding the dark elements of
human nature. Unethical reviewers, secure and unaccountable through anonymity,
all too often make untrue and/or pejorative statements to eliminate their
professional competitors. Survival in this corrupt environment has led to a
consensus-only mentality. Consequently, important scientific contradictions, if
they can be published at all, are selectively ignored in many instances out of
fear of anonymous retaliation. Science Citation Index data in such a corrupt
environment may be of little administrative value, except for possible use in
documenting scientific fraud. Second, as knowledge of the administrative use of
Science Citation Index data spreads, scientists will adapt and will shift to
research on popular subjects to elicit greater numbers of citations, rather
than to take the paths less trodden where important scientific discoveries may
lay waiting.
\\ ( http://arXiv.org/abs/physics/0702118 , 22kb)
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Paper: cond-mat/0702343
Date: Wed, 14 Feb 2007 21:00:06 GMT (44kb)

Title: Analysis of quench dynamics of coupled one dimensional condensates using
quantum sine Gordon model
Authors: Vladimir Gritsev, Eugene Demler, Mikhail Lukin, Anatoli Polkovnikov
Categories: cond-mat.other cond-mat.str-el
Subj-class: Other; Strongly Correlated Electrons
\\
We consider a problem of dynamical splitting of a single one-dimensional
condensate into two coupled condensates. We show that the non-equilibrium
dynamics of this system can be described with the help of the exact solution of
the boundary sine-Gordon model. We demonstrate that the power spectrum of the
temporal oscillations of the amplitude of interference fringes reveals the
spectrum of the quantum sine-Gordon model. We support our conclusions by
performing exact numerical simulations on finite systems. Finally we comment on
general properties of quench dynamics as a tool to reveal the spectrum of
collective excitations in correlated systems.
\\ ( http://arXiv.org/abs/cond-mat/0702343 , 44kb)
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Paper: cond-mat/0702347
Date: Wed, 14 Feb 2007 23:01:59 GMT (269kb)

Title: Bose-Einstein Condensate in Solid Helium
Authors: S.O. Diallo, J.V. Pearce, R.T. Azuah, O. Kirichek, J.W. Taylor, and
H.R. Glyde
Categories: cond-mat.stat-mech cond-mat.other
Comments: 4 pages, 5 figures (in press)
Subj-class: Statistical Mechanics; Other
\\
We present neutron scattering measurements of the atomic momentum
distribution, n(k), in solid helium under a pressure p = 41 bars and at
temperatures between 80 mK and 500 mK. The aim is to determine whether there is
Bose-Einstein condensation (BEC) below the critical temperature, T_c = 200 mK
where a superfluid density has been observed. Assuming BEC appears as a
macroscopic occupation of the k = 0 state below T_c, we find a condensate
fraction of n_0 = (-0.10 \pm 1.20)% at T = 80 mK and n_0 = (0.08\pm0.78)% at T
= 120 mK, consistent with zero. The shape of n(k) also does not change on
crossing T_c within measurement precision.
\\ ( http://arXiv.org/abs/cond-mat/0702347 , 269kb)
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Paper: physics/0702122
Date: Wed, 14 Feb 2007 23:42:52 GMT (961kb)

Title: Observation of single collisionally cooled trapped ions in a buffer gas
Authors: M. Green, J. Wodin, R. DeVoe, P. Fierlinger, B. Flatt, G. Gratta, F.
LePort, M. Montero Diez, R. Neilson, K. OSullivan, A. Pocar, S. Waldman, D.S.
Leonard, A. Piepke, C. Hargrove, D. Sinclair, V. Strickland, W. Fairbank Jr.,
K. Hall, B. Mong, M. Moe, J. Farine, D. Hallman, C. Virtue, E. Baussan, Y.
Martin, D. Schenker, J.-L. Vuilleumier, J.-M. Vuilleumier, P. Weber, M.
Breidenbach, R. Conley, C. Hall, J. Hodgson, D. Mackay, A. Odian, C.Y.
Prescott, P.C. Rowson, K. Skarpaas, and K. Wamba
Categories: physics.atom-ph
Comments: 5 pages, 4 figures, submitted to PRL
Subj-class: Atomic Physics
\\
Individual Ba ions are trapped in a gas-filled linear ion trap and observed
with a high signal-to-noise ratio by resonance fluorescence. Single-ion storage
times of ~5 min (~1 min) are achieved using He (Ar) as a buffer gas at
pressures in the range 8e-5 - 4e-3 torr. Trap dynamics in buffer gases are
experimentally studied in the simple case of single ions. In particular, the
cooling effects of light gases such as He and Ar and the destabilizing
properties of heavier gases such as Xe are studied. A simple model is offered
to explain the observed phenomenology.
\\ ( http://arXiv.org/abs/physics/0702122 , 961kb)
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The replacements:

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Paper: physics/0608074
replaced with revised version Thu, 8 Feb 2007 21:36:51 GMT (77kb)

Title: Measurement of the Temperature Dependence of the Casimir-Polder Force
Authors: J.M. Obrecht, R.J. Wild, M. Antezza, L.P. Pitaevskii, S. Stringari,
E.A. Cornell
Categories: physics.atom-ph cond-mat.soft
Comments: 4 pages, 4 figures, published in Physical Review Letters
Subj-class: Atomic Physics; Soft Condensed Matter
Journal-ref: Phys. Rev. Lett. 98, 063201 (2007)
DOI: 10.1103/PhysRevLett.98.063201
\\ ( http://arXiv.org/abs/physics/0608074 , 77kb)
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Paper: cond-mat/0610773
replaced with revised version Mon, 12 Feb 2007 16:45:40 GMT (440kb)

Title: Dynamical properties of ultracold bosons in an optical lattice
Authors: S.D. Huber, E. Altman, H.P. B\"uchler, and G. Blatter
Categories: cond-mat.other
Subj-class: Other
Journal-ref: Phys. Rev. B 75, 085106 (2007)
DOI: 10.1103/PhysRevB.75.085106
\\ ( http://arXiv.org/abs/cond-mat/0610773 , 440kb)
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Paper: cond-mat/0702058
replaced with revised version Mon, 12 Feb 2007 18:33:23 GMT (9kb)

Title: Is the excitation spectrum of an interacting Bose gas really gapless ?
Authors: A.M. Ettouhami (Univ. of Toronto)
Categories: cond-mat.stat-mech cond-mat.other
Comments: 5 pages; discussion significantly improved, some numerical errors
have been corrected
Subj-class: Statistical Mechanics; Other
\\ ( http://arXiv.org/abs/cond-mat/0702058 , 9kb)
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Paper: cond-mat/0610659
replaced with revised version Tue, 13 Feb 2007 10:59:17 GMT (22kb)

Title: Oscillating Casimir force between impurities in one-dimensional Fermi
liquids
Authors: J.N. Fuchs, A. Recati, and W. Zwerger
Categories: cond-mat.mes-hall
Comments: This paper is a continuation of Phys. Rev. A 72, 023616 (2005). v2:
Subj-class: Mesoscopic Systems and Quantum Hall Effect
\\ ( http://arXiv.org/abs/cond-mat/0610659 , 22kb)
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Paper: cond-mat/0702215
replaced with revised version Tue, 13 Feb 2007 10:51:38 GMT (13kb)

Title: Bose-Einstein condensation and Casimir effect for ideal Bose Gas
confined between two slabs
Authors: Shyamal Biswas
Categories: cond-mat.stat-mech
Subj-class: Statistical Mechanics
\\ ( http://arXiv.org/abs/cond-mat/0702215 , 13kb)
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Paper: cond-mat/0702057
replaced with revised version Tue, 13 Feb 2007 21:30:11 GMT (115kb)

Title: Nematic Order by Disorder in Spin-2 BECs
Authors: Ari Turner, Ryan Barnett, Eugene Demler, and Ashvin Vishwanath
Categories: cond-mat.other
Comments: 5 pages, 4 figures; 1 reference and 1 minor correction
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0702057 , 115kb)
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Paper: quant-ph/0410096
replaced with revised version Wed, 14 Feb 2007 13:53:46 GMT (78kb)

Title: Generation of Two-Flavor Vortex Atom Laser from a Five-State Medium
Authors: Xiong-Jun Liu, Hui Jing, Xin Liu and Mo-Lin Ge
Categories: quant-ph
Comments: 5 pages, 1 figure; The previous version (v2) is a wrong one; this is
the published version
Journal-ref: Eur. Phys. J. D 37, 261-265 (2006)
\\ ( http://arXiv.org/abs/quant-ph/0410096 , 78kb)
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Paper (*cross-listing*): nlin.PS/0607009
replaced with revised version Wed, 14 Feb 2007 18:34:37 GMT (679kb)

Title: Modulated Amplitude Waves in Collisionally Inhomogeneous Bose-Einstein
Condensates
Authors: Mason A. Porter, P. G. Kevrekidis, Boris A. Malomed, and D. J.
Frantzeskakis
Categories: nlin.PS cond-mat.other math.DS physics.atom-ph
Comments: 25 pages, 10 figures (many with several parts), to appear in Physica
D; higher resolution versions of some figures are available at
http://www.its.caltech.edu/~mason/papers
Subj-class: Pattern Formation and Solitons; Other; Atomic Physics; Dynamical
Systems
\\ ( http://arXiv.org/abs/nlin/0607009 , 679kb)
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Till next time,
Matt.

--
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University of Queensland,     ph   : +61 7 334 69824
Brisbane, QLD 4072,           fax  : +61 7 336 51242
Australia.                    http://www.physics.uq.edu.au/people/mdavis/
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Received on Sat Feb 24 2007 - 16:26:48 EST

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