The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>
Hello all,
This week there are 23 new abstracts and 9 replacements.
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Paper: cond-mat/0703237
Date: Fri, 9 Mar 2007 02:34:56 GMT (44kb)
Title: The multi-configurational time-dependent Hartree method for bosons:
Many-body dynamics of bosonic systems
Authors: Ofir E. Alon, Alexej I. Streltsov, and Lorenz S. Cederbaum
Categories: cond-mat.other
Comments: 30 pages, 2 figures
Subj-class: Other
\\
The evolution of Bose-Einstein condensates is amply described by the
time-dependent Gross-Pitaevskii mean-field theory which assumes all bosons to
reside in a single time-dependent one-particle state throughout the propagation
process. In this work, we go beyond mean-field and develop an essentially-exact
many-body theory for the propagation of the time-dependent Schr\"odinger
equation of $N$ interacting identical bosons. In our theory, the time-dependent
many-boson wavefunction is written as a sum of permanents assembled from
orthogonal one-particle functions, or orbitals, where {\it both} the expansion
coefficients {\it and} the permanents (orbitals) themselves are {\it
time-dependent} and fully determined according to a standard time-dependent
variational principle. By employing either the usual Lagrangian formulation or
the Dirac-Frenkel variational principle we arrive at two sets of coupled
equations-of-motion, one for the orbitals and one for the expansion
coefficients. The first set comprises of first-order differential equations in
time and non-linear integro-differential equations in position space, whereas
the second set consists of first-order differential equations with
time-dependent coefficients. We call our theory multi-configurational
time-dependent Hartree for bosons, or MCTDHB($M$), where $M$ specifies the
number of time-dependent orbitals used to construct the permanents. Numerical
implementation of the theory is reported and illustrative numerical examples of
many-body dynamics of trapped Bose-Einstein condensates are provided and
discussed.
\\ ( http://arXiv.org/abs/cond-mat/0703237 , 44kb)
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Paper: cond-mat/0703248
Date: Fri, 9 Mar 2007 16:29:31 GMT (584kb)
Title: Condensate depletion in two-species Bose gases: A variational Quantum
Monte Carlo study
Authors: A. R. Sakhel, J. L. DuBois, and H. R. Glyde
Categories: cond-mat.other
Comments: 19 pages, 17 figures
Subj-class: Other
\\
We investigate two-species Bose gases in traps with various interactions
using variational Quantum Monte Carlo (VMC) techniques at zero temperature. The
bosons are represented by hard spheres (HS) whose diameter is equivalent to the
s-wave scattering length in the low-energy and long-wavelength approximation.
We explore the role of repulsive and attractive inter- or intraspecies
interactions on the condensate properties of the mixtures, particularly the
condensate fraction of each species as compared to the case when each species
is in a separate trap of its own. We model the repulsive interactions by a hard
core (HC) potential and the attractive interactions by a shallow model
potential. The VMC density profiles and energies are evaluated at various
interactions and two mass ratios of the species.
\\ ( http://arXiv.org/abs/cond-mat/0703248 , 584kb)
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Paper: physics/0703105
Date: Thu, 8 Mar 2007 23:10:08 GMT (266kb)
Title: Classical and quantum anomalous diffusion in a system of
2$\delta$-kicked Quantum Rotors
Authors: Jiao Wang and Antonio M. Garcia-Garcia
Categories: physics.atom-ph
Comments: 9 pages, 3 figures
Subj-class: Atomic Physics
\\
We study the dynamics of cold atoms subjected to {\em pairs} of closely
time-spaced $\delta$-kicks from standing waves of light. The classical phase
space of this system is partitioned into momentum cells separated by trapping
regions. In a certain range of parameters it is shown that the classical motion
is well described by a process of anomalous diffusion. We investigate in detail
the impact of the underlying classical anomalous diffusion on the quantum
dynamics with special emphasis on the phenomenon of dynamical localization.
Based on the study of the quantum density of probability, its second moment and
the return probability we identify a region of weak dynamical localization
where the quantum diffusion is still anomalous but the diffusion rate is slower
than in the classical case. Moreover we examine how other relevant time scales
such as the quantum-classical breaking time or the one related to the beginning
of full dynamical localization are modified by the classical anomalous
diffusion. Finally we discuss the relevance of our results for the
understanding of the role of classical cantori in quantum mechanics.
\\ ( http://arXiv.org/abs/physics/0703105 , 266kb)
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Paper: cond-mat/0703258
Date: Mon, 12 Mar 2007 01:13:51 GMT (73kb)
Title: Mixtures of ultracold fermions with unequal masses
Authors: M. Iskin and C. A. R. Sa de Melo
Categories: cond-mat.supr-con cond-mat.other
Comments: 14 pages, 9 figures. Extended version of cond-mat/0606624
Subj-class: Superconductivity; Other
\\
We analyze the phase diagram of superfluidity for two-species fermion
mixtures from the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensation
(BEC) limit as a function of scattering parameter, population imbalance and
mass anisotropy. We identify regions corresponding to normal, or
uniform/non-uniform superfluid phases, and discuss topological quantum phase
transitions in the BCS, unitarity and BEC limits. We derive the Ginzburg-Landau
equation near the critical temperature, and show that it describes a dilute
mixture of paired and unpaired fermions in the BEC limit. We also obtain the
zero temperature low frequency and long wavelength collective excitation
spectrum, and recover the Bogoliubov relation for weakly interacting dilute
bosons in the BEC limit. Lastly, we discuss the effects of harmonic traps and
the resulting density profiles in the BEC regime.
\\ ( http://arXiv.org/abs/cond-mat/0703258 , 73kb)
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Paper: cond-mat/0703261
Date: Mon, 12 Mar 2007 17:10:20 GMT (225kb)
Title: D-wave correlated Critical Bose Liquids in two dimensions
Authors: O. I. Motrunich and M. P. A. Fisher
Categories: cond-mat.str-el
Comments: 33 pages, 17 figures
Subj-class: Strongly Correlated Electrons
\\
We develop a description of a new quantum liquid phase of interacting bosons
in 2d which possesses relative D-wave two-body correlations and which we call a
D-wave Bose Liquid (DBL). The DBL has no broken symmetries, supports gapless
boson excitations residing on "Bose surfaces" in momentum space, and exhibits
power law correlations with continuously variable exponents. While the DBL can
be constructed for bosons in the 2d continuum, the state only respects the
point group symmetries of the square lattice. On the lattice the DBL respects
all symmetries and does not require a particular filling. But lattice effects
allow a second distinct phase, a quasi-local variant which we call a D-wave
Local Bose Liquid (DLBL). Remarkably, the DLBL has short-range boson
correlations and hence no Bose surfaces, despite sharing gapless excitations
and other critical signatures with the DBL. Moreover, both phases are metals
with a resistance that vanishes as a power of the temperature. We establish
these results by constructing a class of many-particle wavefunctions for the
DBL, which are time reversal invariant analogs of Laughlin's quantum Hall
wavefunction for bosons at $\nu=1/2$. A gauge theory formulation leads to a
simple mean field theory, and an N-flavor generalization enables incorporation
of gauge field fluctuations to deduce the properties of the DBL/DLBL; various
equal time correlation functions are in qualitative accord with the properties
inferred from the wavefunctions. We also identify a promising Hamiltonian which
might manifest the DBL or DLBL, and perform a variational study comparing to
other competing phases. We suggest how the DBL wavefunction can be generalized
to describe an itinerant non-Fermi liquid phase of electrons on the square
lattice with a no double occupancy constraint, a D-wave metal phase.
\\ ( http://arXiv.org/abs/cond-mat/0703261 , 225kb)
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Paper: cond-mat/0703262
Date: Sat, 10 Mar 2007 09:33:40 GMT (482kb)
Title: Thinning of superfluid films below the critical point
Authors: Roya Zandi, Aviva Shackell, Joseph Rudnick, Mehran Kardar, Lincoln
Chayes
Categories: cond-mat.stat-mech
Comments: 4 pages
Subj-class: Statistical Mechanics
\\
Experiments on $^4$He films reveal an attractive Casimir-like force at the
bulk $\lambda$-point, and in the superfluid regime. Previous work has explained
the magnitude of this force at the $\lambda$ transition and deep in the
superfluid region but not the substantial attractive force immediately below
the $\lambda$-point. Utilizing a simple mean-field calculation renormalized by
critical fluctuations we obtain an effective Casimir force that is
qualitatively consistent with the scaling function $\vartheta$ obtained by
collapse of experimental data. Notably, we find that the minimum of the scaling
function lies at at $x=tL^{1/\nu}=-\pi^2$ in excellent agreement with the
experimental finding of $x=tL^{1/\nu}=-9.7 \pm 0.8 $.
\\ ( http://arXiv.org/abs/cond-mat/0703262 , 482kb)
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Paper: cond-mat/0703269
Date: Sun, 11 Mar 2007 01:25:25 GMT (187kb)
Title: Issues impacting the observation of Efimov physics in ultracold quantum
gases
Authors: J. P. D'Incao, B. D. Esry
Categories: cond-mat.other
Subj-class: Other
\\
We discuss several issues important for experimentally observing Efimov
physics in ultracold quantum gases. Using numerical solutions of the
three-boson Schrodinger equation over a broad range of scattering lengths and
energies, including model potentials with multiple bound states, we address the
complications of relating experimental observations to available analytic
expressions. These more realistic potentials introduce features that can mask
the predicted Efimov physics at small scattering lengths. They also allow us to
show that positive and negative scattering lengths are universally connected
only across a pole, not across a zero. Additionally, we show that the spacing
between Efimov features for the relatively small scattering lengths
experimentally accessible do not precisely follow the geometric progression
expected for Efimov physics.
\\ ( http://arXiv.org/abs/cond-mat/0703269 , 187kb)
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Paper: cond-mat/0703282
Date: Mon, 12 Mar 2007 01:52:29 GMT (15kb)
Title: Temperature and scattering length dependent condensate fraction of
trapped Bose atoms
Authors: Sang-Hoon Kim
Categories: cond-mat.stat-mech
Comments: 3 pages, 3 figures
Subj-class: Statistical Mechanics
\\
A method to estimate the temperature and scattering length dependent
condensate fraction of interacting Bose atoms confined by an external harmonic
potential is suggested. Starting from the statistical distribution of
non-interacting bosons in a harmonic trap, it is extended to include the
interaction between atoms. The increasing of the interaction produces an
exponential decreasing to the non-interacting model.
\\ ( http://arXiv.org/abs/cond-mat/0703282 , 15kb)
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Paper: cond-mat/0703284
Date: Mon, 12 Mar 2007 06:29:59 GMT (117kb)
Title: Mott insulating phases and quantum phase transitions of interacting
spin-3/2 fermionic cold atoms in optical lattices at half filling
Authors: Hong-Hao Tu, Guang-Ming Zhang, Lu Yu
Categories: cond-mat.str-el
Comments: 11 pages, 4 figures
Subj-class: Strongly Correlated Electrons
\\
We study various Mott insulating phases of interacting spin-3/2 fermionic
ultracold atoms in two-dimensional square optical lattices at half filling.
Using a generalized one-band Hubbard model with hidden SO(5) symmetry, we
identify two distinct symmetry breaking phases: the degenerate
antiferromagnetic spin-dipole/spin-octupole ordering and spin-quadrupole
ordering, depending on the sign of the spin-dependent interaction. These two
competing orders exhibit very different symmetry properties, low energy
excitations and topological characterizations. Near the SU(4) symmetric point,
a quantum critical state with a $\pi $-flux phase may emerge due to strong
quantum fluctuations, leading to spin algebraic correlations and gapless
excitations.
\\ ( http://arXiv.org/abs/cond-mat/0703284 , 117kb)
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Paper: cond-mat/0703292
Date: Mon, 12 Mar 2007 11:24:23 GMT (974kb,D)
Title: Metal clusters, quantum dots and trapped atoms -- from single-particle
models to correlatio
Authors: M. Manninen and S.M. Reimann
Categories: cond-mat.mes-hall cond-mat.mtrl-sci
Comments: 51 pages 29 figures
Subj-class: Mesoscopic Systems and Quantum Hall Effect; Materials Science
\\
In this review, we discuss the electronic structure of finite quantal systems
on the nanoscale. After a few general remarks on the many-particle physics of
the harmonic oscillator -- likely being the most studied example for the
many-body systems of finite quantal systems, we discuss properties of metal
clusters, quantum dots and cold atoms in traps. We address magic numbers, shape
deformation, magnetism, particle localization, and vortex formation in rotating
systems.
\\ ( http://arXiv.org/abs/cond-mat/0703292 , 974kb)
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Paper: cond-mat/0703308
Date: Mon, 12 Mar 2007 19:34:39 GMT (115kb)
Title: Condensates of Strongly-interacting Atoms and Dynamically Generated
Dimers
Authors: Eric Braaten, Dongqing Zhang
Categories: cond-mat.soft
Comments: 10 figures
Subj-class: Soft Condensed Matter
\\
In a system of atoms with large positive scattering length, weakly-bound
diatomic molecules (dimers) are generated dynamically by the strong
interactions between the atoms. If the atoms are modeled by a quantum field
theory with an atom field only, condensates of dimers cannot be described by
the mean-field approximation because there is no field associated with the
dimers. We develop a method for describing dimer condensates in such a model
based on the one-particle-irreducible (1PI) effective action. We construct an
equivalent 1PI effective action that depends not only on the classical atom
field but also on a classical dimer field. The method is illustrated by
applying it to the many-body behavior of bosonic atoms with large scattering
length at zero temperature using an approximation in which the 2-atom amplitude
is treated exactly but irreducible $N$-atom amplitudes for $N \ge 3$ are
neglected. The two 1PI effective actions give identical results for the atom
superfluid phase, but the one with a classical dimer field is much more
convenient for describing the dimer superfluid phase. The results are also
compared with previous work on the Bose gas near a Feshbach resonance.
\\ ( http://arXiv.org/abs/cond-mat/0703308 , 115kb)
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Paper: cond-mat/0703314
Date: Mon, 12 Mar 2007 21:04:34 GMT (539kb)
Title: Quenching, relaxation, and a central limit theorem for quantum lattice
systems
Authors: M. Cramer, C.M. Dawson, J. Eisert, T.J. Osborne
Categories: cond-mat.stat-mech
Comments: 8 pages, 3 figures
Subj-class: Statistical Mechanics
\\
A reasonable physical intuition in the study of interacting quantum systems
says that, independent of the initial state, the system will tend to
equilibrate. In this work we study a setting where relaxation to a steady state
is exact, namely for the Bose-Hubbard model where the system is quenched from a
Mott quantum phase to the strong superfluid regime. We find that the evolving
state locally relaxes to a steady state with maximum entropy constrained by
second moments, maximizing the entanglement, to a state which is different from
the thermal state of the new Hamiltonian. Remarkably, in the infinite system
limit this relaxation is true for all large times, and no time average is
necessary. For large but finite system size we give a time interval for which
the system locally "looks relaxed" up to a prescribed error. Our argument
includes a central limit theorem for harmonic systems and exploits the finite
speed of sound. Additionally, we show that for all periodic initial
configurations, reminiscent of charge density waves, the system relaxes
locally. We sketch experimentally accessible signatures in optical lattices as
well as implications for the foundations of quantum statistical mechanics.
\\ ( http://arXiv.org/abs/cond-mat/0703314 , 539kb)
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Paper: cond-mat/0703322
Date: Tue, 13 Mar 2007 03:39:46 GMT (353kb)
Title: Heteronuclear molecules in an optical lattice: Theory and experiment
Authors: Frank Deuretzbacher, Kim Plassmeier, Daniela Pfannkuche, F\'elix
Werner, Christian Ospelkaus, Silke Ospelkaus, Klaus Sengstock, Kai Bongs
Categories: cond-mat.other
Comments: 9 pages, 7 figures
Subj-class: Other
\\
We study properties of two different atoms at a single optical lattice site
at a heteronuclear atomic Feshbach resonance. We calculate the energy spectrum,
the efficiency of rf-association and the lifetime as a function of magnetic
field and compare the results with the experimental data obtained for K-40 and
Rb-87 [C. Ospelkaus et al., Phys. Rev. Lett. 97, 120402 (2006)]. We treat the
interaction in terms of a regularized delta function pseudopotential and
consider the general case of particles with different trap frequencies, where
the usual approach of separating center of mass and relative motion fails. We
develop an exact diagonalization approach to the coupling between center of
mass and relative motion and numerically determine the spectrum of the system.
At the same time, our approach allows us to treat the anharmonicity of the
lattice potential exactly. Within the pseudopotential model, the center of the
Feshbach resonance can be precisely determined from the experimental data.
\\ ( http://arXiv.org/abs/cond-mat/0703322 , 353kb)
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Paper: cond-mat/0703327
Date: Tue, 13 Mar 2007 06:40:40 GMT (793kb)
Title: Internal Josephson-Like Tunneling in Two-Component Bose-Einstein
Condensates Affected by Sign of the Atomic Interaction and External Trapping
Potential
Authors: Bo Xiong, X. X. Liu
Categories: cond-mat.other
Comments: 4 pages, 5 figures
Subj-class: Other
\\
We study the Josephson-like tunneling in two-component Bose-Einstein
condensates coupled with microwave field in respond to various attractive and
repulsive atomic interaction under the various aspect ratio of trapping
potential and the gravitational field. It is very interesting to find that the
dynamic of Josephson-like tunneling can be controlled from fast damped
oscillations and asymmetric occupation to nondamped oscillation and symmetric
occupation.
\\ ( http://arXiv.org/abs/cond-mat/0703327 , 793kb)
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Paper: cond-mat/0703346
Date: Tue, 13 Mar 2007 16:09:57 GMT (439kb)
Title: Noise correlations in a chain of ultracold fermions - A numerical study
Authors: Andreas Luscher, Andreas Laeuchli, Reinhard M. Noack
Categories: cond-mat.str-el
Comments: 12 pages, 7 figures
Subj-class: Strongly Correlated Electrons
\\
We present a numerical study of noise correlations, i.e., density-density
correlations in momentum space, in the extended fermionic Hubbard model in one
dimension. In experiments with ultracold atoms, these noise correlations can be
extracted from time-of-flight images of the expanding cloud. Using the
density-matrix renormalization group method to investigate the Hubbard model at
various fillings and interactions, we confirm that the shot noise contains full
information on the correlations present in the system. We point out the
importance of the sum rules fulfilled by the noise correlations and show that
they yield nonsingular structures beyond the predictions of bosonization
approaches. Noise correlations can thus serve as a universal probe of order and
can be used to characterize the many-body states of cold atoms in optical
lattices.
\\ ( http://arXiv.org/abs/cond-mat/0703346 , 439kb)
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Paper: quant-ph/0703111
Date: Tue, 13 Mar 2007 18:56:13 GMT (150kb)
Title: Relative-intensity squeezing at audio frequencies using four-wave mixing
in an atomic vapor
Authors: C. F. McCormick, A. M. Marino, V. Boyer, P. D. Lett (NIST)
Categories: quant-ph
Comments: 5 pages, 6 figures
\\
We demonstrate the use of four-wave mixing in hot atomic vapor to generate up
to -7.1 dB of measured relative-intensity squeezing. Due to its intrinsic
simplicity, our system is strongly decoupled from environmental noise, and we
observe more than -4 dB of squeezing down to frequencies as low as 5 kHz. This
robust source of narrowband squeezed light may be useful for a variety of
applications, such as coupling to atomic ensembles and enhancing the
sensitivity of photothermal spectroscopy.
\\ ( http://arXiv.org/abs/quant-ph/0703111 , 150kb)
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Paper: physics/0703136
Date: Tue, 13 Mar 2007 15:26:29 GMT (254kb)
Title: Interactions and dynamics in Li + Li_2 ultracold collisions
Authors: Marko T. Cvitas, Pavel Soldan, Jeremy M. Hutson, Pascal Honvault and
Jean-Michel Launay
Categories: physics.chem-ph physics.atom-ph
Comments: 21 pages, 26 figures
Subj-class: Chemical Physics; Atomic Physics
\\
A potential energy surface for the lowest quartet electronic state of lithium
trimer is developed and used to study spin-polarized Li + Li_2 collisions at
ultralow kinetic energies. The potential energy surface allows barrierless atom
exchange reactions. Elastic and inelastic cross sections are calculated for
collisions involving a variety of rovibrational states of Li_2. Inelastic
collisions are responsible for trap loss in molecule production experiments.
Isotope effects and the sensitivity of the results to details of the potential
energy surface are investigated. It is found that for vibrationally excited
states the cross sections are only quite weakly dependent on details of the
potential energy surface.
\\ ( http://arXiv.org/abs/physics/0703136 , 254kb)
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Paper: cond-mat/0703352
Date: Tue, 13 Mar 2007 20:04:23 GMT (96kb)
Title: Interaction-Induced Adiabatic Cooling for Antiferromagnetism in Optical
Lattices
Authors: A.-M. Dar\'{e}, L. Raymond, G. Albinet, A.-M.S. Tremblay
Categories: cond-mat.str-el cond-mat.other
Comments: 10 pages, 7 figures
Subj-class: Strongly Correlated Electrons; Other
\\
In the experimental context of cold-fermion optical lattices, we discuss the
possibilities to approach the pseudogap or ordered phases by manipulating the
scattering length or the strength of the laser-induced lattice potential. Using
the Two-Particle Self-Consistent Approach as well as Quantum Monte Carlo
simulations, we provide isentropic curves for the two- and three-dimensional
Hubbard models at half-filling. These quantitative results are important for
practical attempts to reach the ordered antiferromagnetic phase in experiments
on optical lattices of two-component fermions. We find that adiabatically
turning on the interaction in two dimensions to cool the system is not very
effective. In three dimensions, adiabatic cooling to the antiferromagnetic
phase can be achieved in such a manner although the cooling efficiency is not
as high as initially suggested by Dynamical Mean-Field Theory. Adiabatic
cooling by turning off the repulsion beginning at strong coupling is possible
in certain cases.
\\ ( http://arXiv.org/abs/cond-mat/0703352 , 96kb)
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Paper: cond-mat/0703366
Date: Wed, 14 Mar 2007 17:08:49 GMT (72kb)
Title: Renormalisation Flow and Universality for Ultracold Fermionic Atoms
Authors: S. Diehl, H. Gies, J. M. Pawlowski, C. Wetterich
Categories: cond-mat.supr-con cond-mat.stat-mech
Comments: 18 pages, 3 figures
Subj-class: Superconductivity; Statistical Mechanics
\\
A functional renormalisation group study for the BEC-BCS crossover for
ultracold gases of fermionic atoms is presented. We discuss the fixed point
which is at the origin of universality for broad Feshbach resonances. All
macroscopic quantities depend only on one relevant parameter, the concentration
a k_F, besides their dependence on the temperature in units of the Fermi
energy. In particular, we compute the universal ratio between molecular and
atomic scattering length in vacuum. We also present an estimate to which level
of accuracy universality holds for gases of Li and K atoms.
\\ ( http://arXiv.org/abs/cond-mat/0703366 , 72kb)
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Paper: quant-ph/0703123
Date: Wed, 14 Mar 2007 19:27:18 GMT (97kb)
Title: The effect of self-affine fractal roughness of wires on atom chips
Authors: Z. Moktadir, B. Darqui\'{e}, M. Kraft and E. A. Hinds
Categories: quant-ph
Comments: 7 pages, 7 figures
\\
Atom chips use current flowing in lithographically patterned wires to produce
microscopic magnetic traps for atoms. The density distribution of a trapped
cold atom cloud reveals disorder in the trapping potential, which results from
meandering current flow in the wire. Roughness in the edges of the wire is
usually the main cause of this behaviour. Here, we point out that the edges of
microfabricated wires normally exhibit self-affine roughness. We investigate
the consequences of this for disorder in atom traps. In particular, we consider
how closely the trap can approach the wire when there is a maximum allowable
strength of the disorder. We comment on the role of roughness in future
atom--surface interaction experiments.
\\ ( http://arXiv.org/abs/quant-ph/0703123 , 97kb)
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Paper (*cross-listing*): hep-ph/0703141
Date: Tue, 13 Mar 2007 17:02:03 GMT (40kb)
Title: What atomic liquids can teach us about quark liquids
Authors: Thomas Schaefer
Categories: hep-ph cond-mat.supr-con
Comments: 8 pages, to appear in the proceedings of the Yukawa International
Seminar (YKIS) 2006 "New frontiers in QCD", Kyoto, Japan; submitted to
Progress of Theoretical Physics
Subj-class: High Energy Physics - Phenomenology; Superconductivity
\\
We discuss some aspects of cold atomic Fermi gases in the unitarity limit
that are of interest in connection with the physics of quark matter and the
quark gluon plasma. We consider, in particular, the equation of state,
transport properties, the critical temperature for pair condensation, and the
response to a pair breaking stress.
\\ ( http://arXiv.org/abs/hep-ph/0703141 , 40kb)
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Paper: quant-ph/0703127
Date: Thu, 15 Mar 2007 01:53:59 GMT (137kb)
Title: Three-Body Recombination in One Dimension
Authors: N. P. Mehta, B. D. Esry, C. H. Greene
Categories: quant-ph
Comments: 15 pages 7 figures Submitted to Physical Review A
Report-no: quant-ph/0703127
\\
We study the three-body problem in one dimension for both zero and finite
range interactions using the adiabatic hyperspherical approach. Particular
emphasis is placed on the threshold laws for recombination, which are derived
for all combinations of the parity and exchange symmetries. For bosons, we
provide a numerical demonstration of several universal features that appear in
the three-body system, and discuss how certain universal features in three
dimensions are different in one dimension. We show that the probability for
inelastic processes vanishes as the range of the pair-wise interaction is taken
to zero and demonstrate numerically that the recombination threshold law
manifests itself for large scattering length.
\\ ( http://arXiv.org/abs/quant-ph/0703127 , 137kb)
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Paper: quant-ph/0703129
Date: Thu, 15 Mar 2007 05:08:30 GMT (12kb)
Title: When Do Superfluidity and Long Range Order Imply Entanglement?
Authors: Vlatko Vedral
Categories: quant-ph
Comments: 7 pages, no figures
\\
We investigate tacitly assumed relationships between the concepts of
super-fluidity (-conductivity), long range order and entanglement. We prove
that the three are by no means equivalent, but that notwithstanding, some
rigorous implication can be established between them. This leads to three
different, albeit frequently related, notions of "criticality", all of which
are exemplified within the Hubbard model in the low density regime. We use
Peierls' method of twisted Hamiltonians to link the existence of entanglement
to superfluidity and (quasi)-long range order. As an application of our
formalism, we show that recent experiments with cold atoms already prove the
existence of the field theoretic, spatial entanglement in two dimensions. More
interestingly, the appearance of entanglement in these experiments seems to be
intimately related to the phase transition of the Kosterlitz Thouless type.
\\ ( http://arXiv.org/abs/quant-ph/0703129 , 12kb)
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Paper: physics/0703148
Date: Wed, 14 Mar 2007 20:06:27 GMT (60kb)
Title: Accuracy Evaluation of an Optical Lattice Clock with Bosonic Atoms
Authors: Xavier Baillard (SYRTE), Mathilde Fouch\'{e} (SYRTE), Rodolphe Le
Targat (SYRTE), Philip G. Westergaard (SYRTE), Arnaud Lecallier (SYRTE), Yann
Le Coq (SYRTE), Giovanni D. Rovera (SYRTE), Sebastien Bize (SYRTE), Pierre
Lemonde (SYRTE)
Categories: physics.atom-ph
Comments: 3 pages, 4 figures, uses ol.sty file
Proxy: ccsd hal-00136647
Subj-class: Atomic Physics
\\
We report the first accuracy evaluation of an optical lattice clock based on
the 1S0 - 3P0 transition of an alkaline earth boson, namely 88Sr atoms. This
transition has been enabled using a static coupling magnetic field. The clock
frequency is determined to be 429 228 066 418 009(32) Hz. The isotopic shift
between 87Sr and 88Sr is 62 188 135 Hz with fractional uncertainty 5.10^{-7}.
We discuss the conditions necessary to reach a clock accuracy of 10^{-17} or
less using this scheme.
\\ ( http://arXiv.org/abs/physics/0703148 , 60kb)
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Paper: quant-ph/0602052
replaced with revised version Fri, 9 Mar 2007 09:18:39 GMT (16kb)
Title: Decoherence and Matter Wave Interferometry
Authors: Tabish Qureshi (Jamia Millia Islamia, New Delhi), Anu Venugopalan
(G.G.S. Indraprastha University, Delhi)
Categories: quant-ph
Comments: Sufficiently revised version, to appear in Int. J. Mod. Phys. B
\\ ( http://arXiv.org/abs/quant-ph/0602052 , 16kb)
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Paper: cond-mat/0608306
replaced with revised version Sun, 11 Mar 2007 19:20:42 GMT (91kb)
Title: Quantum polarization spectroscopy of ultracold spinor gases
Authors: K. Eckert, L. Zawitkowski, A. Sanpera, M. Lewenstein, E.S. Polzik
Categories: cond-mat.other quant-ph
Comments: 5 pages, 1 figure; v2: minor changes
Subj-class: Other
Journal-ref: Phys. Rev. Lett. 98, 100404 (2007)
DOI: 10.1103/PhysRevLett.98.100404
\\ ( http://arXiv.org/abs/cond-mat/0608306 , 91kb)
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Paper: cond-mat/0609212
replaced with revised version Mon, 12 Mar 2007 08:17:35 GMT (229kb)
Title: Exotic Superconducting Phases of Ultracold Atom Mixtures on Triangular
Lattices
Authors: L. Mathey, S.-W. Tsai, A.H. Castro Neto
Categories: cond-mat.supr-con
Comments: 6 pages, 4 figures, extended version, slight modifications
Subj-class: Superconductivity
\\ ( http://arXiv.org/abs/cond-mat/0609212 , 229kb)
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Paper: cond-mat/0512134
replaced with revised version Mon, 12 Mar 2007 22:31:40 GMT (84kb)
Title: Acoustic attenuation probe for fermion superfluidity in ultracold atom
gases
Authors: Sergio Gaudio (1)(2), B. Mihaila (2), K. B. Blagoev (2), K. S. Bedell
(1), Eddy Timmermans (2) (1) (Department of Physics, Boston College) (2)
(Theoretical Division, Los Alamos Natl Labs)
Categories: cond-mat.other
Comments: 4 pages, 2 figures. Revised version
Report-no: LAUR-05-3432
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0512134 , 84kb)
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Paper: cond-mat/0609061
replaced with revised version Tue, 13 Mar 2007 16:02:04 GMT (924kb)
Title: Resonant Einstein-de Haas effect in a rubidium condensate
Authors: Krzysztof Gawryluk, Miros{\l}aw Brewczyk, Kai Bongs, and Mariusz Gajda
Categories: cond-mat.other
Comments: 4 pages, 5 figures
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0609061 , 924kb)
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Paper: cond-mat/0702191
replaced with revised version Tue, 13 Mar 2007 03:36:11 GMT (50kb)
Title: Phase Transitions and Pairing Signature in Strongly Attractive Fermi
Atomic Gases
Authors: X W Guan, M T Batchelor, C Lee and M Bortz
Categories: cond-mat.str-el cond-mat.stat-mech
Comments: 4 pages, 3 figures, improvements to text and references updated
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
\\ ( http://arXiv.org/abs/cond-mat/0702191 , 50kb)
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Paper (*cross-listing*): nucl-th/0701006
replaced with revised version Mon, 12 Mar 2007 20:29:05 GMT (0kb,I)
Title: Spin 1/2 Fermions in the Unitary Limit
Authors: H.S. Kohler
Categories: nucl-th astro-ph cond-mat.other
Comments: 11 pages and 4 figures; This paper will be revised due to a error in
computer-program
Subj-class: Nuclear Theory; Other
\\ ( http://arXiv.org/abs/nucl-th/0701006 , 0kb)
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Paper: quant-ph/0610114
replaced with revised version Tue, 13 Mar 2007 19:44:03 GMT (139kb)
Title: Rotation of atoms in a two dimensional lattice with a harmonic trap
Authors: T. Wang, S. Yelin
Categories: quant-ph
Comments: 4 pages, some paragraphs were refrased, typos corrected. beta is
corrected
\\ ( http://arXiv.org/abs/quant-ph/0610114 , 139kb)
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Paper: quant-ph/0702254
replaced with revised version Tue, 13 Mar 2007 14:27:56 GMT (836kb)
Title: Measurement of Dicke Narrowing in Electromagnetically Induced
Transparency
Authors: M. Shuker, O. Firstenberg, R. Pugatch, A. Ben-Kish, A. Ron, N.
Davidson
Categories: quant-ph
Comments: Introduction revised
\\ ( http://arXiv.org/abs/quant-ph/0702254 , 836kb)
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Paper: cond-mat/0703205
replaced with revised version Wed, 14 Mar 2007 09:19:56 GMT (232kb)
Title: Larkin-Ovchinnikov state in resonant Fermi gas
Authors: Nobukatsu Yoshida and S.-K. Yip
Categories: cond-mat.other
Comments: Typos corrected
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0703205 , 232kb)
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-- ========================================================================= 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 Tue Mar 20 2007 - 17:15:32 EST
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