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

Date: Fri, 24 Aug 2007 15:01:45 +1000 (EST)

Date: Fri, 24 Aug 2007 15:01:45 +1000 (EST)

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

Slowly getting there... a very quiet week this one: 12 new papers and 7

replacments.

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arXiv:0708.0330

Date: Thu, 2 Aug 2007 14:19:47 GMT (63kb)

Title: Spin Noise and Spin Relaxation in Spin Squeezed Alkali-Metal Vapors

Authors: I. K. Kominis

Categories: physics.atom-ph

Comments: 4 pages, 1 figure, submitted to Phys. Rev. Lett

\\

Spin noise sets fundamental limits to the attainable precision of

measurements using spin-polarized atomic vapors, such as performed with

ultra-sensitive atomic magnetometers. Spin squeezing an ensemble of

alkali-metal atoms offers the possibility to extend the measurement precision

beyond the standard quantum limit of uncorrelated atoms and approach the

Heisenberg limit. By virtue of the fluctuation-dissipation theorem, we

demonstrate the intimate connection between spin noise and spin relaxation and

show that the application of spin squeezing can lead to a significant reduction

of spin noise even in the presence of spin relaxation.

\\ ( http://arxiv.org/abs/0708.0330 , 63kb)

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arXiv:0708.0332

Date: Thu, 2 Aug 2007 11:50:02 GMT (491kb)

Title: Coherent Dark Resonances in Atomic Barium

Authors: U. Dammalapati, S. De, K. Jungmann and L. Willmann

Categories: physics.atom-ph

Comments: 4 pages, 5 figures, submitted to Phys. Rev. A

\\

The observation of dark-resonances in the two-electron atom barium and their

influence on optical cooling is reported. In heavy alkali earth atoms, i.e.

barium or radium, optical cooling can be achieved using n^1S_0-n^1P_1

transitions and optical repumping from the low lying n^1D_2 and n^3D_{1,2}

states to which the atoms decay with a high branching ratio. The cooling and

repumping transition have a common upper state. This leads to dark resonances

and hence make optical cooling less inefficient. The experimental observations

can be accurately modelled by the optical Bloch equations. Comparison with

experimental results allows us to extract relevant parameters for effective

laser cooling of barium.

\\ ( http://arxiv.org/abs/0708.0332 , 491kb)

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arXiv:0708.0479

Date: Fri, 3 Aug 2007 10:31:17 GMT (742kb,D)

Title: Bose-Einstein condensates in 1D optical lattices: nonlinearity and

Wannier-Stark spectra

Authors: Ennio Arimondo and Donatella Ciampini and Oliver Morsch

Categories: cond-mat.other

Comments: Chapter of "Nonlinearities of Periodic Structures and Metamaterials"

(edited by C. Denz, S. Flach, and Yu. Kivshar) to be published by Springer

\\

We present our experimental investigations on the subject of

nonlinearity-modified Bloch-oscillations and of nonlinear Landau-Zener

tunneling between two energy bands in a rubidium Bose Einstein condensate in an

accelerated periodic potential. Nonlinearity introduces an asymmetry in

Landau-Zener tunneling. We also present measurements of resonantly enhanced

tunneling between the Wannier-Stark energy levels for Bose-Einstein condensates

loaded into an optical lattice.

\\ ( http://arxiv.org/abs/0708.0479 , 742kb)

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arXiv:0708.0610

Date: Sat, 4 Aug 2007 05:57:57 GMT (139kb)

Title: Three fully polarized fermions close to a p-wave Feshbach resonance

Authors: Mattia Jona-Lasinio (LKB - Lhomond, LENS), Ludovic Pricoupenko

(LPTMC), Yvan Castin (LKB - Lhomond)

Categories: cond-mat.other

Comments: 23 pages, 8 figures

Proxy: ccsd hal-00166351

\\

We numerically solve the three-body problem for three atomic fermions, in the

same spin state, experiencing a resonant interaction in the p-wave channel via

a Feshbach resonance represented by a two-channel model. The rate of inelastic

processes due to recombination to deeply bound dimers is then estimated from

the three-body solution using a simple prescription. We obtain numerical and

analytical predictions for most of the experimentally relevant quantities that

can be extracted from the three-body solution: the existence of weakly bound

trimers and their lifetime, the low-energy elastic and inelastic scattering

properties of an atom on a weakly bound dimer, and the recombination rates for

three colliding atoms towards weakly bound and deeply bound dimers.

\\ ( http://arxiv.org/abs/0708.0610 , 139kb)

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arXiv:0708.0663

Date: Sun, 5 Aug 2007 08:44:38 GMT (811kb)

Title: Bose-Einstein condensation of magnons in superfluid 3He

Authors: Yu.M. Bunkov and G.E. Volovik

Categories: cond-mat.other

Comments: 10 pages, 5 figures, prepared for proceedings of QFS-2007, JLTP style

\\

The possibility of Bose-Einstein condensation of excitations has been

discussed for a long time. The phenomenon of the phase-coherent precession of

magnetization in superfluid 3He and the related effects of spin superfluidity

are based on the true Bose-Einstein condensation of magnons. Several different

states of coherent precession has been observed in 3He-B: homogeneously

precessing domain (HPD); persistent signal formed by Q-balls at very low

temperatures; coherent precession with fractional magnetization; and two new

modes of the coherent precession in compressed aerogel. In compressed aerogel

the coherent precession has been also found in 3He-A. Here we demonstrate that

all these cases are examples of a Bose-Einstein condensation of magnons, with

the magnon interaction term in the Gross-Pitaevskii equation being provided by

different types of spin-orbit coupling in the background of the coherent

precession.

\\ ( http://arxiv.org/abs/0708.0663 , 811kb)

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arXiv:0708.0665

Date: Mon, 6 Aug 2007 10:29:16 GMT (254kb)

Title: Sisyphus damping and amplification by a superconducting qubit

Authors: M. Grajcar, S.H.W. van der Ploeg, A. Izmalkov, E. Il'ichev, H.-G.

Meyer, A. Fedorov, A. Shnirman, Gerd Schoen

Categories: cond-mat.supr-con

Comments: 5 pages, 4 figures

\\

Furthering the analogies between superconducting and quantum optical systems

we demonstrate Sisyphus damping, which is the key element of the Sisyphus

cooling protocol, as well as its exact opposite, Sisyphus amplification. For

this purpose the qubit is coupled to a low-frequency LC circuit and driven

near-resonantly by a high-frequency external field. The combination of

red-detuned driving of the coupled system with spontaneous emission processes,

creates a situation where in the complete oscillation cycle of the LC circuit

energy is transferred from the LC circuit to the qubit, similar to Sisyphus who

always had to roll a stone uphill. The qubit, in turn, transfers the energy

into the environment. For blue-detuning the same mechanism creates excitations

in the LC circuit with a tendency towards lasing and the characteristic

line-width narrowing. In this regime ``lucky Sisyphus'' always rolls the stone

downhill. Parallel to the experimental demonstration we analyze the system

theoretically and find quantitative agreement, which allows us to estimate the

system parameters.

\\ ( http://arxiv.org/abs/0708.0665 , 254kb)

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arXiv:0708.0810

Date: Mon, 6 Aug 2007 18:10:46 GMT (215kb,D)

Title: All-optical formation of a Bose-Einstein condensate for applications in

scanning electron microscopy

Authors: T. Gericke, P. Wuertz, D. Reitz, C. Utfeld, H. Ott

Categories: cond-mat.stat-mech

Comments: 5 pages, 4 figures

\\

We report on the production of a F=1 spinor condensate of 87Rb atoms in a

single beam optical dipole trap formed by a focused CO2 laser. The condensate

is produced 13mm below the tip of a scanning electron microscope employing

standard all-optical techniques. The condensate fraction contains up to 100,000

atoms and we achieve a duty cycle of less than 10s.

\\ ( http://arxiv.org/abs/0708.0810 , 215kb)

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arXiv:0708.0752

Date: Mon, 6 Aug 2007 12:36:39 GMT (933kb)

Title: Two-color photoassociation spectroscopy of ytterbium atoms and the

precise determinations of s-wave scattering lengths

Authors: Masaaki Kitagawa, Katsunari Enomoto, Kentaro Kasa, Yoshiro Takahashi,

Roman Ciurylo, Pascal Naidon, and Paul S. Julienne

Categories: physics.atom-ph

Comments: 9 pages, 7 figures

\\

By performing high-resolution two-color photoassociation spectroscopy, we

have successfully determined the binding energies of several of the last bound

states of the homonuclear dimers of six different isotopes of ytterbium. These

spectroscopic data are in excellent agreement with theoretical calculations

based on a simple model potential, which very precisely predicts the s-wave

scattering lengths of all 28 pairs of the seven stable isotopes. The s-wave

scattering lengths for collision of two atoms of the same isotopic species are

13.33(18) nm for ^{168}Yb, 3.38(11) nm for ^{170}Yb, -0.15(19) nm for ^{171}Yb,

-31.7(3.4) nm for ^{172}Yb, 10.55(11) nm for ^{173}Yb, 5.55(8) nm for ^{174}Yb,

and -1.28(23) nm for ^{176}Yb. The coefficient of the lead term of the

long-range van der Waals potential of the Yb_2 molecule is C_6=1932(30) atomic

units $(E_h a_0^6 \approx 9.573\times 10^{-26}$ J nm^6).

\\ ( http://arxiv.org/abs/0708.0752 , 933kb)

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arXiv:0708.0646

Date: Mon, 6 Aug 2007 07:44:50 GMT (249kb)

Title: Does the h-index have predictive power?

Authors: J. E. Hirsch

Categories: physics.soc-ph

\\

Bibliometric measures of individual scientific achievement are of particular

interest if they can be used to predict future achievement. Here we report

results of an empirical study of the predictive power of the h-index compared

to other indicators. Our findings indicate that the h-index is better than

other indicators considered (total citation count, citations per paper, and

total paper count) in predicting future scientific achievement. We discuss

reasons for the superiority of the h-index.

\\ ( http://arxiv.org/abs/0708.0646 , 249kb)

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arXiv:0708.0894

Date: Tue, 7 Aug 2007 08:16:55 GMT (65kb)

Title: Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi

Superfluid

Authors: Masaki Tezuka and Masahito Ueda

Categories: cond-mat.str-el

Comments: 4 pages, 3 figures, submitted to Phys. Rev. Lett

\\

The density-matrix renormalization group is employed to investigate a

harmonically-trapped imbalanced Fermi superfluid based on a one-dimensional

attractive Hubbard model. The obtained density profile shows a flattened

population difference of spin-up and spin-down components at the center of the

trap, consistent with the Rice experiment [G. B. Partridge et al., Science 311,

503 (2006)]. The two-particle density matrix reveals that the sign of the order

parameter changes in space with the period depending on population imbalance P,

demonstrating the realization of the Fulde-Ferrell-Larkin-Ovchinnikov phase.

The fraction of Cooper pairs against minority atoms is found to increase with

increasing P.

\\ ( http://arxiv.org/abs/0708.0894 , 65kb)

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arXiv:0708.0896

Date: Tue, 7 Aug 2007 08:22:53 GMT (191kb)

Title: Long term dynamics of the splitting of a doubly quantized vortex in a

two-dimensional condensate

Authors: Halvor M. Nilsen and Emil Lundh

Categories: cond-mat.other

Comments: 29 pages, 10 figures

\\

We study the nonlinear dynamics of the splitting of a doubly quantized vortex

in a trapped condensate. The dynamics is studied in detail by solving the

Gross-Pitaevskii equation. The main dynamical features are explained in terms

of a nonlinear three-level system. We find an analytical solution for the

characteristics of the dynamics. It is concluded that the time scale for the

splitting is mainly determined by the instability of the linearized system, and

nonlinear effects contribute logarithmically.

\\ ( http://arxiv.org/abs/0708.0896 , 191kb)

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arXiv:0708.1043

Date: Wed, 8 Aug 2007 04:40:35 GMT (77kb)

Title: Form factors and correlation functions of an interacting spinless

fermion model

Authors: Kohei Motegi and Kazumitsu Sakai

Categories: cond-mat.stat-mech

Comments: 18 pages

\\

Introducing the fermionic R-operator and solutions of the inverse scattering

al

representation for zero-temperature correlation functions of a one-dimensional

interacting spinless fermion model. Correlation functions particularly

considered are the one-particle Green's function and the density-density

correlation function both for any interaction strength and for arbitrary

particle densities. In particular for the free fermion model, our formulae

reproduce the known exact results. Form factors of local fermion operators are

also calculated for a finite system.

\\ ( http://arxiv.org/abs/0708.1043 , 77kb)

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The replacements:

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arXiv:0706.3376

replaced with revised version Fri, 3 Aug 2007 14:58:54 GMT (404kb)

Title: Quantum limited measurements of atomic scattering properties

Authors: A. M. Rey, L. Jiang and M. D. Lukin

Categories: cond-mat.other

Comments: 7 pages, 5 figures. References added

\\ ( http://arxiv.org/abs/0706.3376 , 404kb)

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arXiv:0707.4172

replaced with revised version Fri, 3 Aug 2007 05:37:45 GMT (104kb)

Title: Pairing states of a polarized Fermi gas trapped in a one-dimensional

optical lattice

Authors: A.E. Feiguin, and F. Heidrich-Meisner

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

Comments: 4 pages, 5 figs

\\ ( http://arxiv.org/abs/0707.4172 , 104kb)

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arXiv:0704.1735

replaced with revised version Mon, 6 Aug 2007 23:14:11 GMT (17kb)

Title: Calorimetry of Bose-Einstein condensates

Authors: P. B. Blakie, E. Toth, M. J. Davis

Categories: cond-mat.other

Comments: 6 pages, 1 figure. Updated to published version

Journal-ref: J. Phys. B: At. Mol. Opt. Phys. 40, 3273 (2007)

\\ ( http://arxiv.org/abs/0704.1735 , 17kb)

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arXiv:0707.1006

replaced with revised version Tue, 7 Aug 2007 12:07:51 GMT (147kb,D)

Title: The manifestation of quantum resonances and antiresonances in a finite

temperature dilute atomic gas

Authors: M. Saunders, P. L. Halkyard, K. J. Challis, S. A. Gardiner

Categories: physics.atom-ph nlin.CD

Comments: 15 pages, 7 figures

\\ ( http://arxiv.org/abs/0707.1006 , 147kb)

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arXiv:cond-mat/0701346

replaced with revised version Wed, 8 Aug 2007 08:58:00 GMT (10kb)

Title: Expansion of a Bose-Einstein Condensate in the Presence of Disorder

Authors: B. Shapiro

Categories: cond-mat.other

Journal-ref: PRL 99, 060602 (2007)

\\ ( http://arxiv.org/abs/cond-mat/0701346 , 10kb)

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arXiv:0706.0823

replaced with revised version Thu, 9 Aug 2007 12:16:17 GMT (561kb)

Title: Dynamics of Localization Phenomena for Hardcore Bosons in Optical

Lattices

Authors: Birger Horstmann, Juan Ignacio Cirac, Tommaso Roscilde

Categories: cond-mat.str-el cond-mat.dis-nn

Comments: 14 pages, 16 figures; added references, minor revisions; to appear in

Phys. Rev. A

\\ ( http://arxiv.org/abs/0706.0823 , 561kb)

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arXiv:0707.2571

replaced with revised version Thu, 9 Aug 2007 16:42:35 GMT (515kb)

Title: Dynamical and energetic instabilities in multi-component Bose-Einstein

condensates in optical lattices

Authors: J. Ruostekoski and Zachary Dutton

Categories: cond-mat.other physics.optics quant-ph

Comments: 17 pages, 12 figures. Submitted to Phys. Rev. A

\\ ( http://arxiv.org/abs/0707.2571 , 515kb)

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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 Fri Aug 24 2007 - 15:01:45 EST

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