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

Date: Thu, 11 Jan 2007 14:38:06 +1000 (EST)

Date: Thu, 11 Jan 2007 14:38:06 +1000 (EST)

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

It's been a slow start to the year for me, and thankfully for the arXiv as well.

This week there are only 12 new papers and 8 replacements.

Yesterday the 299th subscriber signed up to this list....

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Paper: cond-mat/0612685

Date: Fri, 29 Dec 2006 01:21:12 GMT (147kb)

Title: High-Resolution Magnetometry with a Spinor Bose-Einstein Condensate

Authors: M. Vengalattore, J. M. Higbie, S. R. Leslie, J. Guzman, L. E. Sadler

and D. M. Stamper-Kurn

Categories: cond-mat.other

Subj-class: Other

\\

We demonstrate a precision magnetic microscope based on direct imaging of the

Larmor precession of a $^{87}$Rb spinor Bose-Einstein condensate. This

magnetometer attains a field sensitivity of 8.3 pT/Hz$^{1/2}$ over a

measurement area of 120 $\mu$m$^2$, an improvement over the low-frequency field

sensitivity of modern SQUID magnetometers. The corresponding atom shot-noise

limited sensitivity is estimated to be 0.15 pT/Hz$^{1/2}$ for unity duty cycle

measurement. The achieved phase sensitivity is close to the atom shot-noise

limit suggesting possibilities of spatially resolved spin-squeezed

magnetometry. This magnetometer marks a significant application of degenerate

atomic gases to metrology.

\\ ( http://arXiv.org/abs/cond-mat/0612685 , 147kb)

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Paper: cond-mat/0701005

Date: Sat, 30 Dec 2006 07:24:38 GMT (79kb)

Title: Effective Field Theory for Light in Disordered Atomic Medium

Authors: M.B. Smirnov, M.A. Baranov

Categories: cond-mat.other cond-mat.dis-nn

Comments: 22 pages, 1 figure

Subj-class: Other; Disordered Systems and Neural Networks

\\

We develop a field theory approach to light propagation in a gas of resonant

atoms taking into account vector character of light and atom-atom interactions.

Within this approach, we calculate the propagator of the electric field for

both short and long-range density-density correlation functions of the gas.

\\ ( http://arXiv.org/abs/cond-mat/0701005 , 79kb)

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Paper: cond-mat/0701028

Date: Mon, 1 Jan 2007 23:21:35 GMT (749kb)

Title: Observation of Faraday Waves in a Bose-Einstein Condensate

Authors: P. Engels, C. Atherton, M. A. Hoefer

Categories: cond-mat.other

Comments: 4 pages, 5 figures

Subj-class: Other

\\

Faraday waves in a cigar-shaped Bose-Einstein condensate are created. It is

shown that periodically modulating the transverse confinement, and thus the

nonlinear interactions in the BEC, excites small amplitude longitudinal

oscillations through a parametric resonance. It is also demonstrated that even

without the presence of a continuous drive, an initial transverse breathing

mode excitation of the condensate leads to spontaneous pattern formation in the

longitudinal direction. Finally, the effects of strongly driving the transverse

breathing mode with large amplitude are investigated. In this case,

impact-oscillator behavior and intriguing nonlinear dynamics, including the

gradual emergence of multiple longitudinal modes, are observed.

\\ ( http://arXiv.org/abs/cond-mat/0701028 , 749kb)

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Paper: quant-ph/0701008

Date: Tue, 2 Jan 2007 09:57:57 GMT (371kb)

Title: Theory of Dicke narrowing in coherent population trapping

Authors: O. Firstenberg, M. Shuker, A. Ben-Kish, D. R. Fredkin, N. Davidson, A.

Ron

Categories: quant-ph

Comments: 6 pages, 2 figures

\\

The Doppler effect is one of the dominant broadening mechanisms in thermal

vapor spectroscopy. For two-photon transitions one would naively expect the

Doppler effect to cause a residual broadening, proportional to the wave-vector

difference. In coherent population trapping (CPT), which is a narrow-band

phenomenon, such broadening was not observed experimentally. This has been

commonly attributed to frequent velocity-changing collisions, known to narrow

Doppler-broadened one-photon absorption lines (Dicke narrowing). Here we show

theoretically that such a narrowing mechanism indeed exists for CPT resonances.

The narrowing factor is the ratio between the atom's mean free path and the

wavelength associated with the wave-vector difference of the two radiation

fields. A possible experiment to verify the theory is suggested.

\\ ( http://arXiv.org/abs/quant-ph/0701008 , 371kb)

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Paper: physics/0701003

Date: Fri, 29 Dec 2006 23:04:02 GMT (407kb)

Title: Coherent Slowing of a Supersonic Beam with an Atomic Paddle

Authors: E. Narevicius, A. Libson, M.F. Riedel, C.G. Parthey, I. Chavez, U.

Even, and M.G. Raizen

Categories: physics.atom-ph

Subj-class: Atomic Physics

\\

We report the slowing of a supersonic beam by elastic reflection from a

receding atomic mirror. We use a pulsed supersonic nozzle to generate a 511 +/-

9 m/s beam of helium that we slow by reflection from a Si(111)-H(1x1) crystal

placed on the tip of a spinning rotor. We were able to reduce the velocity of

helium by 246 m/s and show that the temperature of the slowed beam is lower

than 250 mK in the co-moving frame.

\\ ( http://arXiv.org/abs/physics/0701003 , 407kb)

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Paper: physics/0701018

Date: Sun, 31 Dec 2006 18:46:21 GMT (60kb)

Title: Atom interferometry using wavepackets with constant spatial separations

Authors: Edward J. Su, Saijun Wu, Mara Prentiss

Categories: physics.atom-ph

Subj-class: Atomic Physics

\\

We demonstrate a standing wave light pulse sequence that places atoms into a

superposition of displaced wavepackets with precisely controlled separations

that remain constant for times as long as 1 s. The separated wavepackets are

subsequently recombined resulting in atom interference patterns that probe

energy differences of approximately 10^-34 J, and can provide acceleration

measurements that are insensitive to platform vibrations.

\\ ( http://arXiv.org/abs/physics/0701018 , 60kb)

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Paper: physics/0701023

Date: Tue, 2 Jan 2007 10:40:09 GMT (563kb)

Title: Influence of lasers propagation delay on the sensitivity of atom

interferometers

Authors: J. Le Gou\"et, P. Cheinet, J. Kim, D. Holleville, A. Clairon, A.

Landragin, F. Pereira Dos Santos

Categories: physics.atom-ph

Comments: 17 pages, 6 figures

Subj-class: Atomic Physics

\\

In atom interferometers based on two photon transitions, the delay induced by

the difference of the laser beams paths makes the interferometer sensitive to

the fluctuations of the frequency of the lasers. We first study, in the general

case, how the laser frequency noise affects the performance of the

interferometer measurement. Our calculations are compared with the measurements

performed on our cold atom gravimeter based on stimulated Raman transitions. We

finally extend this study to the case of cold atom gradiometers.

\\ ( http://arXiv.org/abs/physics/0701023 , 563kb)

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Paper: cond-mat/0701044

Date: Tue, 2 Jan 2007 22:48:27 GMT (280kb)

Title: Dynamics of the BCS-BEC crossover from a few-body perspective

Authors: Javier von Stecher, Chris H. Greene

Categories: cond-mat.supr-con

Comments: 5 pages, 3 figures

Subj-class: Superconductivity

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The spectrum of two spin-up and two spin-down fermions in a trap is

calculated using a correlated gaussian basis throughout the range of the

BCS-BEC crossover. The solutions are used to calculate the time-evolution of

the system as the scattering length is changed, mimicking experiments with

Fermi gases near Fano-Feshbach resonances. The dynamics of the system can be

understood as a sequence of Landau-Zener transitions. Finally, we propose a

ramping scheme to study atom-molecule coherence and we study molecular

conversion efficiency from a two-body picture.

\\ ( http://arXiv.org/abs/cond-mat/0701044 , 280kb)

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Paper: cond-mat/0701050

Date: Wed, 3 Jan 2007 12:55:24 GMT (80kb)

Title: Crossover dark soliton dynamics in ultracold one-dimensional Bose gases

Authors: D.J. Frantzeskakis, P.G. Kevrekidis and N.P. Proukakis

Categories: cond-mat.other

Comments: To appear in Phys. Lett. A

Subj-class: Other

\\

Ultracold confined one-dimensional atomic gases are predicted to support dark

soliton solutions arising from a nonlinear Schr\"{o}dinger equation of suitable

nonlinearity. In weakly-interacting (high density) gases, the nonlinearity is

cubic, whereas an approximate model for describing the behaviour of strongly -

interacting (low density) gases is one characterized by a quintic nonlinearity.

We use an approximate analytical expression for the form of the nonlinearity in

the intermediate regimes to show that, near the crossover between the two

different regimes, the soliton is predicted and numerically confirmed to

oscillate at a frequency of $\sqrt{2/3}\Omega$, where $\Omega$ is the harmonic

trap frequency.

\\ ( http://arXiv.org/abs/cond-mat/0701050 , 80kb)

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Paper: cond-mat/0701051

Date: Wed, 3 Jan 2007 15:32:23 GMT (410kb)

Title: Collisional properties of sympathetically cooled $^{39}$K

Authors: L. De Sarlo, P. Maioli, G. Barontini, J. Catani, F. Minardi, and M.

Inguscio

Categories: cond-mat.other

Comments: 7 pages, 4 figures, submitted to Phys. Rev. A

Subj-class: Other

\\

We report the experimental evidence of the sympathetic cooling of $^{39}$K

with $^{87}$Rb down to 1 $\mu$K, obtained in a novel tight confining magnetic

trap. This allowed us to perform the first direct measurement of the elastic

cross section of $^{39}$K below 50 $\mu$K. The result obtained for the triplet

scattering length, $a_T = -51(7)$ Bohr radii, agrees with previous results

derived from photoassociation spectra and from Feshbach spectroscopy of

$^{40}$K.

\\ ( http://arXiv.org/abs/cond-mat/0701051 , 410kb)

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Paper: cond-mat/0701057

Date: Wed, 3 Jan 2007 20:12:33 GMT (24kb)

Title: Using time reversal symmetry for sensitive incoherent matter-wave Sagnac

interferometry

Authors: Y. Japha, O. Arzouan, Y. Avishai and R. Folman

Categories: cond-mat.other

Subj-class: Other

\\

We present a theory of the transmission of incoherent guided matter-waves

through Sagnac interferometers. Interferometer configurations with only one

input and one output port have a property similar to the phase rigidity

observed in the transmission through Aharonov-Bohm interferometers in coherent

mesoscopic electronics. This property is connected to the existence of

counterpropagating paths of equal length and enables the operation of such

matter-wave interferometers with incoherent sources. High finesse

interferometers of this kind have a rotation sensitivity inversely proportional

to the square root of the finesse.

\\ ( http://arXiv.org/abs/cond-mat/0701057 , 24kb)

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Paper: cond-mat/0701058

Date: Wed, 3 Jan 2007 21:00:24 GMT (9kb)

Title: Decoherence dynamics in low-dimensional cold atoms interferometers

Authors: A.A. Burkov, M.D. Lukin, Eugene Demler

Categories: cond-mat.supr-con cond-mat.str-el

Comments: 4 pages

Subj-class: Superconductivity; Strongly Correlated Electrons

\\

We report on a study of the dynamics of decoherence of a matter-wave

interferometer, consisting of a pair of low-dimensional cold atoms condensates

at finite temperature. We identify two distinct regimes in the time dependence

of the coherence factor of the interferometer: quantum and classical. Explicit

analytical results are obtained in both regimes. In particular, in the

two-dimensional (2D) case in the classical (long time) regime, we find that the

dynamics of decoherence is universal, exhibiting a power-law decay with an

exponent, proportional to the ratio of the temperature to the

Kosterlitz-Thouless temperature of a single 2D condensate. In the

one-dimensional (1D) case in the classical regime we find a universal

nonanalytic time dependence of decoherence, which is a consequence of the

nonhydrodynamic nature of damping in 1D liquids.

\\ ( http://arXiv.org/abs/cond-mat/0701058 , 9kb)

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Paper: cond-mat/0612616

replaced with revised version Fri, 29 Dec 2006 12:23:15 GMT (65kb)

Title: Role of excited states in the splitting dynamics of interacting

Bose-Einstein condensates when ramping-up a barrier

Authors: Alexej I. Streltsov, Ofir E. Alon and Lorenz S. Cederbaum

Categories: cond-mat.other

Comments: 11 pages, 3 figures

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0612616 , 65kb)

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Paper: cond-mat/0604063

replaced with revised version Sat, 30 Dec 2006 10:48:58 GMT (348kb)

Title: Disorder versus the Mermin-Wagner-Hohenberg effect: From classical spin

systems to ultracold atomic gases

Authors: Jan Wehr (ICFO, University of Arizona), Armand Niederberger (ICFO),

Laurent Sanchez-Palencia (LCFIO), Maciej Lewenstein (ICFO)

Categories: cond-mat.other

Comments: published version; 8 pages, 3 figures

Proxy: ccsd ccsd-00022177

Subj-class: Other

Journal-ref: Physical Review B 74 (2006) 224448

DOI: 10.1103/PhysRevB.74.224448

\\ ( http://arXiv.org/abs/cond-mat/0604063 , 348kb)

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Paper: cond-mat/0606201

replaced with revised version Tue, 2 Jan 2007 04:33:13 GMT (95kb)

Title: Quantum limits to center-of-mass measurements

Authors: Timothy Vaughan, Peter Drummond, Gerd Leuchs

Categories: cond-mat.other cond-mat.mes-hall

Comments: 12 pages, 6 figures. Submitted to PRA. Revised to include more

references as well as a discussion of fermionic center-of-mass

Subj-class: Other; Mesoscopic Systems and Quantum Hall Effect

\\ ( http://arXiv.org/abs/cond-mat/0606201 , 95kb)

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Paper: cond-mat/0609307

replaced with revised version Mon, 1 Jan 2007 08:38:51 GMT (241kb)

Title: Hidden order in 1D Bose insulators

Authors: Emanuele G. Dalla Torre, Erez Berg, Ehud Altman

Categories: cond-mat.other cond-mat.str-el

Comments: Letter

Subj-class: Other; Strongly Correlated Electrons

\\ ( http://arXiv.org/abs/cond-mat/0609307 , 241kb)

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Paper: cond-mat/0610071

replaced with revised version Tue, 2 Jan 2007 18:56:30 GMT (359kb)

Title: Ground states of spin-3 Bose-Einstein condensates for conserved

magnetization

Authors: Harri M\"akel\"a, Kalle-Antti Suominen

Categories: cond-mat.other

Comments: 8 pages, 4 figures; text and references added, one new figure

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0610071 , 359kb)

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Paper: cond-mat/0612376

replaced with revised version Tue, 2 Jan 2007 23:27:16 GMT (59kb)

Title: Expansion of a mesoscopic Fermi system from a harmonic trap

Authors: Pavel Nagornykh and Victor Galitski

Categories: cond-mat.mes-hall cond-mat.supr-con

Comments: 4 pages, 1 color figure; v2.: A reference added

Subj-class: Mesoscopic Systems and Quantum Hall Effect; Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0612376 , 59kb)

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Paper: cond-mat/0605154

replaced with revised version Wed, 3 Jan 2007 23:44:53 GMT (19kb)

Title: Emergence of Artificial Photons in an Optical Lattice

Authors: Sumanta Tewari, V. W. Scarola, T. Senthil, S. Das Sarma

Categories: cond-mat.str-el

Comments: 4 pages, 2 eps figure

Subj-class: Strongly Correlated Electrons

Journal-ref: Phys. Rev. Lett. 97, 200401 (2006)

DOI: 10.1103/PhysRevLett.97.200401

\\ ( http://arXiv.org/abs/cond-mat/0605154 , 19kb)

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Paper: physics/0610210

replaced with revised version Wed, 3 Jan 2007 17:01:34 GMT (20kb)

Title: Feshbach resonances in ultracold atomic and molecular collisions:

threshold behavior and suppression of poles in scattering lengths

Authors: Jeremy M. Hutson

Categories: physics.atom-ph physics.chem-ph

Comments: 4 pages, 1 figure. Version 3 revised to emphasise the importance of

the_relative_ strength of elastic and inelastic couplings and to explain when

strong suppression of resonant peaks is (or is not) expected

Subj-class: Atomic Physics; Chemical Physics

\\ ( http://arXiv.org/abs/physics/0610210 , 20kb)

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Till next time (it won't be as long)

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 Thu Jan 11 2007 - 14:38:06 EST

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