Matt's arXiv selection: week ending 10 August 2007.

From: Matthew Davis <>
Date: Fri, 24 Aug 2007 15:01:45 +1000 (EST)

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

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

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.
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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.
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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.
\\ ( , 742kb)
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.
\\ ( , 139kb)
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
\\ ( , 811kb)
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.
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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.
\\ ( , 215kb)
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).
\\ ( , 933kb)
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.
\\ ( , 249kb)
Date: Tue, 7 Aug 2007 08:16:55 GMT (65kb)

Title: Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi
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.
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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.
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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
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.
\\ ( , 77kb)

The replacements:

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
\\ ( , 404kb)
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
\\ ( , 104kb)
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)
\\ ( , 17kb)
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
\\ ( , 147kb)
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)
\\ ( , 10kb)
replaced with revised version Thu, 9 Aug 2007 12:16:17 GMT (561kb)

Title: Dynamics of Localization Phenomena for Hardcore Bosons in Optical
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
\\ ( , 561kb)
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
\\ ( , 515kb)

Till next time,

Dr M. J. Davis,               Senior Lecturer in Physics
School of Physical Sciences,  email:
University of Queensland,     ph   : +61 7 334 69824
Brisbane, QLD 4072,           fax  : +61 7 336 51242
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Received on Fri Aug 24 2007 - 15:01:45 EST

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