From: Matthew Davis <mdavis_at_physics.uq.edu.au>

Date: Sat, 24 Feb 2007 16:26:48 +1000 (EST)

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.

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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

Comments: 7 pages, 3 figures

\\

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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

Comments: 4 pages

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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

Authors: Sadhan K. Adhikari

Categories: cond-mat.other

Comments: 8 pages, 12 figures

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)

------------------------------------------------------------------------------

\\

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

Comments: 15 pages, 5 figures

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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

Comments: 5 pages, 2 figures

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)

------------------------------------------------------------------------------

\\

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

Comments: 17 pages, 4 figures

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)

------------------------------------------------------------------------------

\\

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

Comments: 4 pages

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)

------------------------------------------------------------------------------

\\

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

Comments: 4 pages, 4 figures

\\

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)

------------------------------------------------------------------------------

\\

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

Comments: 6 pages, 3 figures

\\

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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

Comments: 11 pages, 16 figures

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)

------------------------------------------------------------------------------

\\

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

Authors: Sadhan K. Adhikari

Categories: cond-mat.other

Comments: 18 pages, 7 figures

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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

Comments: 4 pages, 4 figures

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)

------------------------------------------------------------------------------

\\

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

administrative purposes

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)

------------------------------------------------------------------------------

\\

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

Comments: 4+ pages, 3 figures

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

The replacements:

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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

Comments: 13 pages, 5 figures

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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:

two appendix added

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\ ( http://arXiv.org/abs/cond-mat/0610659 , 22kb)

------------------------------------------------------------------------------

\\

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

Comments: 4 pages,1 figure

Subj-class: Statistical Mechanics

\\ ( http://arXiv.org/abs/cond-mat/0702215 , 13kb)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

\\

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)

------------------------------------------------------------------------------

Till next time,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= 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 Sat Feb 24 2007 - 16:26:48 EST

*
This archive was generated by hypermail 2.2.0
: Thu May 08 2008 - 11:51:41 EST
*