The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>
Hi all,
This week there were 25 preprints and 7 replacements:
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arXiv:0711.2598
Date: Fri, 16 Nov 2007 12:50:48 GMT (439kb)
Title: Magnetic trapping of a cold Rb-Cs atomic mixture
Authors: M L Harris, P Tierney, S L Cornish
Categories: cond-mat.other
Comments: 16 pages, 5 figures
\\
We present an apparatus for the study of an ultracold gaseous atomic mixture
of 133Cs and 87Rb. The mixture is prepared using a double magneto-optical trap
(MOT) system in which a two-species pyramid MOT acts as a source of cold atoms
for a `science' MOT. Measurements of the interspecies trap loss rate
coefficients beta_RbCs and beta_CsRb in the science MOT are reported. After the
initial MOT phase, atoms in the mixture are optically pumped into the
magnetically trappable |F=3,m_F=-3> and |F=1,m_F=-1> states of Cs and Rb
(respectively) and loaded into an Ioffe-Pritchard magnetic trap. We demonstrate
a novel technique for limiting the interspecies loss rate in the science MOT by
spatially separating the two trapped atom clouds, which greatly enhances the
number of atoms which can be loaded into the magnetic trap.
\\ ( http://arxiv.org/abs/0711.2598 , 439kb)
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arXiv:0711.2436 (*cross-listing*)
Date: Thu, 15 Nov 2007 15:19:37 GMT (707kb)
Title: Nonlinear Dynamics in Double Square Well Potential
Authors: Ramaz Khomeriki, Jerome Leon, Stefano Ruffo, Sandro Wimberger
Categories: nlin.PS cond-mat.other math-ph math.MP physics.atom-ph
Journal-ref: Theor. Math. Phys., v. 152, p.1122 (2007)
\\
Considering the coherent nonlinear dynamics in double square well potential
we find the example of coexistence of Josephson oscillations with a
self-trapping regime. This macroscopic bistability is explained by proving
analytically the simultaneous existence of symmetric, antisymmetric and
asymmetric stationary solutions of the associated Gross-Pitaevskii equation.
The effect is illustrated and confirmed by numerical simulations. This property
allows to make suggestions on possible experiments using Bose-Einstein
condensates in engineered optical lattices or weakly coupled optical waveguide
arrays.
\\ ( http://arxiv.org/abs/0711.2436 , 707kb)
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arXiv:0711.2662
Date: Fri, 16 Nov 2007 18:33:38 GMT (104kb)
Title: Electromagnetically induced transparency at high optical power
Authors: S. M. Iftiquar
Categories: physics.optics physics.atom-ph
Comments: 3 pages, five figures
\\
We observe electromagnetically induced transparency (EIT) in Rb vapor at
various optical intensities, starting from below saturation to several times
the saturation intensity. The observed Lorentzian width of the EIT signal is
very small. Solving the time dependant density matrix equation of motion with a
phenomenological decay constant, we find an expression suitable in explaining
the EIT signal. In this experimental observation and theoretical analysis
intensity of EIT signal and its Lorentzian width increases with Rabi frequency
of optical field.
\\ ( http://arxiv.org/abs/0711.2662 , 104kb)
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arXiv:0711.2663
Date: Fri, 16 Nov 2007 18:39:32 GMT (84kb)
Title: Wide range and highly sensitive atomic magnetometry with Rb vapor
Authors: S. M. Iftiquar
Categories: physics.optics physics.atom-ph
Comments: 3 pages, 4 figures
\\
We have developed a technique in which Rb atomic response to weak magnetic
field is high and an efficient rotation of linearly polarized laser beam
results in efficient magnetometry. 85Rb isotope has been used for the
magnetometry in an ordinary vapor cell without any paraffin coating to its
inner wall. A linear regime of Faraday rotation of about 25 microT has been
observed with atomic number density within the vapor cell of about 109 cm-3.
\\ ( http://arxiv.org/abs/0711.2663 , 84kb)
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arXiv:0711.2697
Date: Fri, 16 Nov 2007 22:54:39 GMT (177kb)
Title: Exact edge singularities in dynamic correlation functions of 1D Bose gas
Authors: Adilet Imambekov and Leonid I. Glazman
Categories: cond-mat.str-el
\\
The spectral function and dynamic structure factor of bosons interacting by
contact repulsion and confined to one dimension (1D) exhibit power-law
singularities along the dispersion curves of the collective modes. We find the
corresponding exponents exactly, by relating them to the known Bethe Ansatz
solution of the Lieb-Liniger model. The found exponents vary considerably with
the interaction strength and momentum. Remarkably, the Luttinger liquid theory
predictions for the exponents fail even at low energies, once the immediate
vicinities of the edges are considered.
\\ ( http://arxiv.org/abs/0711.2697 , 177kb)
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arXiv:0711.2778
Date: Mon, 19 Nov 2007 16:12:34 GMT (560kb)
Title: Formation and dynamics of many-boson fragmented states in attractive
one-dimensional ultra-cold gases
Authors: Alexej I. Streltsov, Ofir E. Alon and Lorenz S. Cederbaum
Categories: cond-mat.other
Comments: 11 pages, 3 figures
\\
Dynamics of attractive ultra-cold bosonic clouds in one dimension are studied
by solving the many-particle time-dependent Schr\"odinger equation. The
initially coherent wave-packet can dynamically dissociate into two parts when
its energy exceeds a threshold value. Noticeably, the time-dependent
Gross-Pitaevskii theory applied to the same initial state does not show up the
splitting. We call the split object {\it fragmenton}. It possesses remarkable
properties: (1) it is two-fold fragmented, i.e., not coherent; (2) it is
dynamically stable, i.e., it propagates almost without dispersion; (3) it is
delocalized, i.e., the two dissociated parts still communicate with one
another. A simple static model predicts the existence of fragmented states
which are responsible for formation and dynamics of fragmentons.
\\ ( http://arxiv.org/abs/0711.2778 , 560kb)
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arXiv:0711.2891
Date: Mon, 19 Nov 2007 10:29:29 GMT (164kb)
Title: Asymmetric Fermi Superfluid With Two Types Of Pairings
Authors: Xuguang Huang, Xuewen Hao and Pengfei Zhuang
Categories: cond-mat.supr-con cond-mat.mes-hall
Comments: 6 pages, 1 figure. Proceedings of Poster Session, Quark Matter 2006,
November 14-20, 2006, Shanghai, P.R.China
Journal-ref: Int. J. Mod. Phys. E 16, (2007) 2307
\\
We investigate the phase diagram in the plane of temperature and chemical
potential mismatch for an asymmetric fermion superfluid with double- and
single-species pairings. There is no mixing of these two types of pairings at
fixed chemical potential, but the introduction of the single species pairing
cures the magnetic instability at low temperature.
\\ ( http://arxiv.org/abs/0711.2891 , 164kb)
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arXiv:0711.2916
Date: Mon, 19 Nov 2007 20:34:12 GMT (784kb,D)
Title: Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach
resonances and scattering properties of 6Li and 40K
Authors: E. Wille, F.M. Spiegelhalder, G. Kerner, D. Naik, A. Trenkwalder, G.
Hendl, F. Schreck, R. Grimm, T.G. Tiecke, J.T.M. Walraven, S.J.J.M.F.
Kokkelmans, E. Tiesinga, P.S. Julienne
Categories: cond-mat.other
Comments: 4 pages, 4 figures, 1 table
\\
We report on the observation of Feshbach resonances in an ultracold mixture
of two fermionic species, 6Li and 40K. The experimental data are interpreted
using a simple asymptotic bound state model and full coupled channels
calculations. This unambiguously assigns the observed resonances in terms of
various s- and p-wave molecular states and fully characterizes the ground-state
scattering properties in any combination of spin states.
\\ ( http://arxiv.org/abs/0711.2916 , 784kb)
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arXiv:0711.2963
Date: Mon, 19 Nov 2007 15:49:31 GMT (856kb)
Title: Renormalization Group Theory for the Imbalanced Fermi Gas
Authors: K. B. Gubbels and H. T. C. Stoof
Categories: cond-mat.stat-mech cond-mat.supr-con
Comments: 4 pages, 2 figures
\\
We develop a wilsonian renormalization group theory for the imbalanced Fermi
gas. The theory is able to recover quantitatively well-established results in
both the weak-coupling and the strong-coupling (unitarity) limit. We determine
for the latter case the line of second-order phase transitions of the
imbalanced Fermi gas and in particular the location of the tricritical point.
We obtain good agreement with the recent experiments of Y. Shin {\it et al}.
arXiv:0709.3027 [cond-mat].
\\ ( http://arxiv.org/abs/0711.2963 , 856kb)
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arXiv:0711.2975
Date: Mon, 19 Nov 2007 18:13:31 GMT (37kb)
Title: Self-Trapping of Bosons and Fermions in Optical Lattices
Authors: Dirk-S\"oren L\"uhmann, Kai Bongs, Klaus Sengstock, Daniela Pfannkuche
Categories: cond-mat.other
Comments: 4 pages, 4 figures
\\
We numerically investigate the enhanced localisation of bosonic 87Rb by
fermionic 40K atoms in three-dimensional optical lattices and find a
self-trapping of bosons and fermions. Due to the mutual interaction the fermion
orbitals are substantially squeezed which results in a strong deformation of
the bosonic effective potential. This effect is enhanced by an increasing
bosonic filling factor leading to a large shift of the phase transition between
the superfluid and the Mott-insulator. We find a non-linear dependency of the
critical point on the interaction strength and show the important role of
orbital effects in attractively interacting atomic mixtures. The results are of
direct relevance to recent experiments with 87Rb - 40K mixtures, where a large
shift of the critical point has been found.
\\ ( http://arxiv.org/abs/0711.2975 , 37kb)
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arXiv:0711.2173 (*cross-listing*)
Date: Wed, 14 Nov 2007 11:55:27 GMT (6kb)
Title: Statistical ensemble equivalence problem
Authors: Ludwik Turko
Categories: hep-th cond-mat.stat-mech
Comments: 5 pages, Talk given at the conference ''New Trends in High Energy
Physics'', Crimea 2007, Yalta, 15-22 September 2007
\\
A problem of the equivalence of statistical ensembles is critically analyzed.
It is shown, that although different probability distributions of statistical
physics have the same behavior in the thermodynamic limit, there are physical
observables -- semi-intensive variables -- which keep memory of the underlying
ensembles. This property is an universal one and can be observed even in the
simplest case of the grand canonical and canonical ensembles of the classical
statistical physics.
\\ ( http://arxiv.org/abs/0711.2173 , 6kb)
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arXiv:0711.2750
Date: Sat, 17 Nov 2007 16:59:27 GMT (496kb)
Title: Double Electromagnetically Induced Transparency in a Tripod-type Atom
System
Authors: Xiao Li, Yu Liu, and Hong Guo
Categories: quant-ph
Comments: 5 pages, and 8 figures
\\
The electromagnetically induced transparency (EIT) phenomenon in a four level
atomic system with tripod configuration is studied. The results show that this
configuration is equivalent to the combination of two single three-level
$\Lambda$ configurations, which, under certain conditions, results in the
so-called double-EIT (DEIT) phenomenon. The properties of the double
transparency windows for DEIT are discussed in detail and the possible
experimental scheme is proposed.
\\ ( http://arxiv.org/abs/0711.2750 , 496kb)
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arXiv:0711.3102
Date: Tue, 20 Nov 2007 10:06:24 GMT (202kb)
Title: Atom laser dynamics in a tight-waveguide
Authors: A. del Campo, I. Lizuain, M. Pons, J. G. Muga, M. Moshinsky
Categories: cond-mat.other cond-mat.soft
Comments: 6 pages, 5 figures, to be published in the Proceedings of the 395th
WE-Heraeus Seminar on "Time Dependent Phenomena in Quantum Mechanics ",
organized by T. Kramer and M. Kleber (Blaubeuren, Germany, September 2007)
\\
We study the transient dynamics that arise during the formation of an atom
laser beam in a tight waveguide. During the time evolution the density profile
develops a series of wiggles which are related to the diffraction in time
phenomenon. The apodization of matter waves, which relies on the use of smooth
aperture functions, allows to suppress such oscillations in a time interval,
after which there is a revival of the diffraction in time. The revival time
scale is directly related to the inverse of the harmonic trap frequency for the
atom reservoir.
\\ ( http://arxiv.org/abs/0711.3102 , 202kb)
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arXiv:0711.3105
Date: Tue, 20 Nov 2007 10:19:56 GMT (149kb)
Title: Optical properties of atomic Mott insulators: from slow light to
dynamical Casimir effects
Authors: Iacopo Carusotto, Mauro Antezza, Francesco Bariani, Simone De
Liberato, Cristiano Ciuti
Categories: cond-mat.other
\\
We theoretically study the optical properties of a gas of ultracold,
coherently dressed three-level atoms in a Mott insulator phase of an optical
lattice. The vacuum state, the band dispersion and the absorption spectrum of
the polariton field can be controlled in real time by varying the amplitude and
the frequency of the dressing beam. In the weak dressing regime, the system
shows unique ultra-slow light propagation properties without absorption. In the
presence of a fast time modulation of the dressing amplitude, we predict a
significant emission of photon pairs by parametric amplification of the
polaritonic zero-point fluctuations. Quantitative considerations on the
experimental observability of such a dynamical Casimir effect are presented for
the most promising atomic species and level schemes.
\\ ( http://arxiv.org/abs/0711.3105 , 149kb)
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arXiv:0711.3116
Date: Tue, 20 Nov 2007 11:11:13 GMT (985kb)
Title: Seeking better times: atomic clocks in the generalized Tonks-Girardeau
regime
Authors: S. V. Mousavi, A. del Campo, I. Lizuain, M. Pons, J. G. Muga
Categories: quant-ph
Comments: 12 pages, 10 figures,to be published in the Proceedings of the 395th
WE-Heraeus Seminar on "Time Dependent Phenomena in Quantum Mechanics ",
organized by T. Kramer and M. Kleber (Blaubeuren, Germany, September 2007)
\\
This article is based on the talk with the same title at the Blaubeuren
meeting. First we discuss briefly the importance of time and time keeping,
explaining the basic functioning of clocks in general and atomic clocks in
particular, which rely on Ramsey interferometry. The usefulness of cold atoms
is discussed as well as their limits in Bose-Einstein condensates. An
alternative that we study is a different cold-atom regime: the Tonks-Girardeau
(TG) gas of tightly confined and strongly interacting bosons. The TG gas is
reviewed and then generalized for two-level atoms. Finally, we explore the
combination of Ramsey interferometry and TG gases.
\\ ( http://arxiv.org/abs/0711.3116 , 985kb)
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arXiv:0710.5444 (*cross-listing*)
Date: Mon, 29 Oct 2007 14:47:24 GMT (57kb)
Title: Light propagation in atomic Mott Insulators
Authors: Francesco Bariani, Iacopo Carusotto
Categories: physics.optics cond-mat.other physics.atom-ph
\\
We study radiation-matter interaction in a system of ultracold atoms trapped
in an optical lattice in a Mott insulator phase. We develop a fully general
quantum model, and we perform calculations for a one-dimensional geometry at
normal incidence. Both two- and three-level $\Lambda$ atomic configurations are
studied. The polariton dispersion and the reflectivity spectra are
characterized in the different regimes, for both semi-infinite and finite-size
geometries. We apply this model to propose a photon energy lifter experiment: a
device which is able to shift the carrier frequency of a slowly travelling
wavepacket without affecting the pulse shape nor its coherence.
\\ ( http://arxiv.org/abs/0710.5444 , 57kb)
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arXiv:0711.3006 (*cross-listing*)
Date: Mon, 19 Nov 2007 19:59:16 GMT (24kb,D)
Title: Strongly-Paired Fermions: Cold Atoms and Neutron Matter
Authors: Alexandros Gezerlis and J. Carlson
Categories: nucl-th cond-mat.other
Comments: 4 pages, 4 figures
\\
Experiments with cold Fermi atoms can be tuned to probe strongly-interacting
fluids that are very similar to the low-density neutron matter found in the
crusts of neutron stars. In contrast to traditional superfluids and
superconductors, matter in this regime is very strongly paired, with gaps of
the order of the Fermi energy. We compute the T=0 equation of state and pairing
gap for cold atoms and low-density neutron matter as a function of the Fermi
momentum times the scattering length. Results of Quantum Monte Carlo
calculations show that the equations of state are very similar. The neutron
matter pairing gap at low densities is found to be very large but, except at
the smallest densities, significantly suppressed relative to cold atoms because
of the finite effective range in the neutron-neutron interaction.
\\ ( http://arxiv.org/abs/0711.3006 , 24kb)
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arXiv:0711.3230
Date: Tue, 20 Nov 2007 23:07:51 GMT (152kb,D)
Title: Many-body Landau-Zener tunneling in the Bose-Hubbard model
Authors: Andrea Tomadin, Riccardo Mannella, Sandro Wimberger
Categories: cond-mat.str-el
Comments: 10 pages, 6 figures. High-quality figures can be requested to the
authors
\\
We study a model for ultracold, spinless atoms in quasi-one dimensional
optical lattices and subjected to a tunable tilting force. Statistical tests
are employed to quantitatively characterize the spectrum of the Floquet-Bloch
operator of the system along the transition from the regular to the quantum
chaotic regime. Moreover, we perturbatively include the coupling of the
one-band model to the second energy band. This allows us to study the
Landau-Zener interband tunneling within a truly many-body description of
ultracold atoms. The distributions of the computed tunneling rates provide an
independent and experimentally accessible signature of the regular-chaotic
transition.
\\ ( http://arxiv.org/abs/0711.3230 , 152kb)
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arXiv:0711.3270
Date: Wed, 21 Nov 2007 07:46:30 GMT (116kb)
Title: Observing Zitterbewegung in Ultracold Atoms
Authors: J. Y. Vaishnav, Charles W. Clark
Categories: cond-mat.mes-hall
\\
We propose an optical lattice scheme which would permit the experimental
observation of Zitterbewegung (ZB) with ultracold, neutral atoms. A four-level
"tripod" variant of the usual setup for stimulated Raman adiabatic passage
(STIRAP) has been proposed for generating non-Abelian gauge fields [1].
Dirac-like Hamiltonians, which exhibit ZB, are simple examples of such
non-Abelian gauge fields; we show how a variety of them can arise, and how ZB
can be observed, in a tripod system. We predict that the ZB should occur at
experimentally accessible frequencies and amplitudes.
\\ ( http://arxiv.org/abs/0711.3270 , 116kb)
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arXiv:0711.3406
Date: Wed, 21 Nov 2007 16:42:21 GMT (242kb)
Title: Ultra-cold dipolar gases
Authors: Chiara Menotti and Maciej Lewenstein
Categories: cond-mat.other
Comments: 11 pages, 11 figures, to be published in the Proceedings of the
RPMBT14 conference (Barcelona, July 2007), Series on Advances in Quantum
Many-Body Theory, World Scientific
\\
We present a concise review of the physics of ultra-cold dipolar gases, based
mainly on the theoretical developments in our own group. First, we discuss
shortly weakly interacting ultra-cold trapped dipolar gases. Dipolar
Bose-Einstein condensates exhibit non-standard instabilities and the physics of
both Bose and Fermi dipolar gases depends on the trap geometry. We focus then
the second part of the paper on strongly correlated dipolar gases and discuss
ultra-cold dipolar gases in optical lattices. Such gases exhibit a spectacular
richness of quantum phases and metastable states, which may perhaps be used as
quantum memories. We comment shortly on the possibility of superchemistry
aiming at the creation of dipolar heteronuclear molecules in lattices. Finally,
we turn to ultra-cold dipolar gases in artificial magnetic fields, and consider
rotating dipolar gases, that provide in our opinion the best option towards the
realization of the fractional quantum Hall effect and quantum Wigner crystals.
\\ ( http://arxiv.org/abs/0711.3406 , 242kb)
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arXiv:0711.3422
Date: Wed, 21 Nov 2007 17:52:47 GMT (432kb)
Title: Dipolar interaction in ultra-cold atomic gases
Authors: C. Menotti, M. Lewenstein, T. Lahaye, and T. Pfau
Categories: cond-mat.other
Comments: 30 pages, 17 figures, to be published in the Proceedings of the
Workshop "Dynamics and Thermodynamics of Systems with Long Range
Interactions" (Assisi, July 2007), AIP Conference Proceedings
\\
Ultra-cold atomic systems provide a new setting where to investigate the role
of long-range interactions. In this paper we will review the basics features of
those physical systems, in particular focusing on the case of Chromium atoms.
On the experimental side, we report on the observation of dipolar effects in
the expansion dynamics of a Chromium Bose-Einstein condensate. By using a
Feshbach resonance, the scattering length characterising the contact
interaction can be strongly reduced, thus increasing the relative effect of the
dipole-dipole interaction. Such experiments make Chromium atoms the strongest
candidates at present for the achievement of the strong dipolar regime.
On the theoretical side, we investigate the behaviour of ultra-cold dipolar
systems in the presence of a periodic potential. We discuss how to realise this
situation experimentally and we characterise the system in terms of its quantum
phases and metastable states, discussing in detail the differences with respect
to the case of zero-range interactions.
\\ ( http://arxiv.org/abs/0711.3422 , 432kb)
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arXiv:0711.3425
Date: Wed, 21 Nov 2007 18:26:17 GMT (15kb)
Title: Achieving the Neel state in an optical lattice
Authors: Arnaud Koetsier, R. A. Duine, Immanuel Bloch, H. T. C. Stoof
Categories: cond-mat.stat-mech
Comments: 4 pages, 2 figures, RevTeX
\\
We theoretically study the possibility of reaching the antiferromagnetic
phase of the Hubbard model by starting from a normal gas of trapped fermionic
atoms and adiabatically ramping up an optical lattice. Requirements on the
initial temperature and the number of atoms are determined for a three
dimensional square lattice by evaluating the Neel state entropy, taking into
account fluctuations around the mean-field solution. We find that these
fluctuations place important limitations on adiabatically reaching the Neel
state.
\\ ( http://arxiv.org/abs/0711.3425 , 15kb)
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arXiv:0711.3431
Date: Wed, 21 Nov 2007 18:52:04 GMT (250kb)
Title: Quantum phase transition in a ferromagnetic Bose-Einstein condensate:
dynamics from the broken-symmetry to the polar phase
Authors: Bogdan Damski and Wojciech H. Zurek
Categories: cond-mat.other
Comments: 10 pages, 11 figures
Report-no: LAUR-07-7540
\\
We discuss the dynamics of a quantum phase transition in a spin-1
Bose-Einstein condensate when it is driven from the magnetized broken-symmetry
phase to the unmagnetized polar phase. We determine where the condensate goes
out of equilibrium as it approaches the critical point, and compute
magnetization at the critical point. We also study magnetization oscillations
in the polar phase, and explain in detail how they are affected by
non-equilibrium dynamics near a critical point.
\\ ( http://arxiv.org/abs/0711.3431 , 250kb)
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arXiv:0711.3244
Date: Wed, 21 Nov 2007 01:34:55 GMT (849kb)
Title: Doppler-free, Multi-wavelength Acousto-optic deflector for two-photon
addressing arrays of Rb atoms in a Quantum Information Processor
Authors: Sangtaek Kim, Robert R. Mcleod, Mark Saffman, and Kelvin H. Wagner
Categories: quant-ph
Comments: 28 pages, 16 figures, submitted to Applied Optics
\\
We demonstrate a dual wavelength acousto-optic deflector (AOD) designed to
deflect two wavelengths to the same angles by driving with two RF frequencies.
The AOD is designed as a beam scanner to address two-photon transitions in a
two-dimensional array of trapped neutral Rb atoms in a quantum computer.
Momentum space is used to design AODs that have the same diffraction angles for
two wavelengths (780 nm and 480 nm) and have non-overlapping Bragg-matched
frequency response at these wavelengths, so that there will be no crosstalk
when proportional RF frequencies are applied to diffract the two wavelengths.
The appropriate crystal orientation, crystal shape, transducer size, and
transducer height are determined for an AOD made with a Tellurium dioxide
crystal (TeO2). The designed and fabricated AOD has more than 100 resolvable
spots, widely separated bandshapes for the two wavelengths within an overall
octave bandwidth, spatially overlapping diffraction angles for both wavelengths
(780 nm and 480 nm), and a 4 usec or less access time. Cascaded AODs in which
the first device upshifts and the second downshifts allow Doppler-free scanning
as required for addressing the narrow atomic resonance without detuning. We
experimentally show the diffraction-limited Doppler-free scanning performance
and spatial resolution of the designed AOD.
\\ ( http://arxiv.org/abs/0711.3244 , 849kb)
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arXiv:0711.3238
Date: Wed, 21 Nov 2007 00:02:39 GMT (267kb)
Title: Suppression of molecular decay in ultracold gases without Fermi
statistics
Authors: J. P. D'Incao, B. D. Esry
Categories: physics.atom-ph
\\
We study inelastic processes for ultracold three-body systems in which only
one interaction is resonant. We have found that the decay rates for weakly
bound molecules due to collisions with other atoms can be suppressed not only
without fermionic statistics but also when bosonic statistics applies. In
addition, we show that at ultracold temperatures three-body recombination
involving a single resonant pair of atoms leads mainly to formation of weakly
bound molecules which, in turn, are stable against decay. These results
indicate that recombination in three-component atomic gases can be used as an
efficient mechanism for molecular formation, allowing the achievement of high
molecular densities.
\\ ( http://arxiv.org/abs/0711.3238 , 267kb)
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arXiv:cond-mat/0609059
replaced with revised version Fri, 16 Nov 2007 08:17:48 GMT (813kb)
Title: Anomalous Heat Conduction in Quasi-One-Dimensional Gases
Authors: Taka H. Nishino
Categories: cond-mat.stat-mech
Comments: 10 pages, 4 figures
Journal-ref: Progress of Theoretical Physics, 118 (2007) 657
\\ ( http://arxiv.org/abs/cond-mat/0609059 , 813kb)
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arXiv:0709.0362
replaced with revised version Fri, 16 Nov 2007 09:29:01 GMT (226kb)
Title: Non-perturbative renormalization-group approach to zero-temperature Bose
systems
Authors: N. Dupuis and K. Sengupta
Categories: cond-mat.other hep-th
Comments: v1) 6 pages, 8 figures; v2) added references; v3) corrected typos
Journal-ref: Europhys. Lett. 80, 50007 (2007)
DOI: 10.1209/0295-5075/80/50007
\\ ( http://arxiv.org/abs/0709.0362 , 226kb)
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arXiv:0709.3158
replaced with revised version Fri, 16 Nov 2007 16:00:56 GMT (110kb)
Title: Twin peaks in rf spectra of Fermi gases at unitarity in the normal phase
Authors: P. Massignan, G. M. Bruun and H. T. C. Stoof
Categories: cond-mat.other cond-mat.str-el
Comments: v2: added spectra of both the majority and the minority components of
an imbalanced Fermi gas
\\ ( http://arxiv.org/abs/0709.3158 , 110kb)
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arXiv:0704.0763
replaced with revised version Fri, 16 Nov 2007 09:31:45 GMT (316kb)
Title: Coherent control of atomic tunneling
Authors: John Martin and Daniel Braun
Categories: quant-ph
Comments: 6 pages revtex, 4 figures, extended version including numerical
results taking into account higher vibrationnal levels
\\ ( http://arxiv.org/abs/0704.0763 , 316kb)
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arXiv:cond-mat/0702343
replaced with revised version Fri, 16 Nov 2007 21:19:30 GMT (12kb)
Title: Spectroscopy of Collective Excitations in Interacting Low-Dimensional
Many-Body Systems Using Quench Dynamics
Authors: Vladimir Gritsev, Eugene Demler, Mikhail Lukin, Anatoli Polkovnikov
Categories: cond-mat.other cond-mat.str-el
Comments: 4 pages, 2 figures; replaced with revised version
Journal-ref: Phys. Rev. Lett. 99, 200404 (2007)
DOI: 10.1103/PhysRevLett.99.200404
\\ ( http://arxiv.org/abs/cond-mat/0702343 , 12kb)
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arXiv:quant-ph/0703160 (*cross-listing*)
replaced with revised version Mon, 19 Nov 2007 04:58:45 GMT (14kb)
Title: Quantum origin of quantum jumps: Breaking of unitary symmetry induced by
information transfer and the transition from quantum to classical
Authors: Wojciech Hubert Zurek
Categories: quant-ph cond-mat.stat-mech hep-th
Comments: Final version with an extended discussion of the implications
\\ ( http://arxiv.org/abs/quant-ph/0703160 , 14kb)
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arXiv:0709.0698
replaced with revised version Tue, 20 Nov 2007 18:39:14 GMT (254kb)
Title: Probing two-fluid hydrodynamics in a trapped Fermi superfluid at
unitarity
Authors: Edward Taylor, Hui Hu, Xia-Ji Liu, Allan Griffin
Categories: cond-mat.other
Comments: Figures 1-3 modified, Figure 4 added, minor changes made in text,
references updated
\\ ( http://arxiv.org/abs/0709.0698 , 254kb)
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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 Wed Dec 19 2007 - 08:35:28 EST
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