Hi all,
A massive 37 papers make the arXiv selection this week.
But first, a small piece of spam: we are now accepting abstract submissions for
the International Workshop on Quantum Noise, covering cover hot topics in
quantum optics and ultracold quantum gases. Full details at the bottom of the
email - submissions close 23rd February 2007.
On with the new abstracts:
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Paper: cond-mat/0702029
Date: Thu, 1 Feb 2007 21:04:40 GMT (38kb)
Title: Unusual liquid state of hard-core bosons on the pyrochlore lattice
Authors: Argha Banerjee, Sergei V. Isakov, Kedar Damle, Yong Baek Kim
Categories: cond-mat.str-el
Comments: 4 pages, two column format
Subj-class: Strongly Correlated Electrons
\\
We study the physics of hard-core bosons with unfrustrated hopping ($t$) and
nearest neighbour repulsion ($V$) on the three dimensional pyrochlore lattice.
At half-filling, we demonstrate that the small $V/t$ superfluid state
eventually becomes unstable at large enough $V/t$ to an unusual insulating
state which displays no broken lattice translation symmetry. Equal time and
static density correlators in this insulator are well-described by a mapping to
electric field correlators in the Coulomb phase of a U(1) lattice gauge theory,
allowing us to identify this insulator with a U(1) fractionalized Mott
insulating state. The possibility of observing this phase in suitably designed
atom-trap experiments with ultra-cold atoms is also discussed, as are specific
experimental signatures.
\\ ( http://arXiv.org/abs/cond-mat/0702029 , 38kb)
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Paper: cond-mat/0702031
Date: Thu, 1 Feb 2007 22:40:42 GMT (70kb)
Title: Thermodynamic uncertainty relation
Authors: L. Velazquez
Categories: cond-mat.stat-mech
Comments: 4 pages, 2 eps figures
Subj-class: Statistical Mechanics
\\
Starting from a very general thermodynamic equilibrium situation between a
given interest system and certain generalized thermostat, a suitable extension
of the well-known thermodynamic relation between the heat capacity and the
energy fluctuations has been obtained in the present work. The resulting
identity is able to account for thermodynamical states with a negative heat
capacity C<0, representing at the same time a thermodynamic uncertainty
relation imposing certain restrictions to the determination of the
microcanonical caloric curve. The implications of the present result in the
development of new Monte Carlo methods and its apparent analogies with the
Quantum Mechanics are briefly commented.
\\ ( http://arXiv.org/abs/cond-mat/0702031 , 70kb)
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Paper: cond-mat/0702034
Date: Fri, 2 Feb 2007 16:46:03 GMT (332kb)
Title: Species-specific optical lattices
Authors: L. J. LeBlanc and J. H. Thywissen
Categories: cond-mat.stat-mech
Comments: 10 pages, 4 figures
Subj-class: Statistical Mechanics
\\
We examine single-frequency optical schemes for species-selective trapping of
ultracold alkali atoms. The ability to independently optically address the
elements of a binary mixture enables the creation of a lattice for one atomic
species with little or no effect on the other. A "tune-in" scheme, using a near
resonant detuning to create a stronger potential for one element than for all
others, is explored. A "tune-out" scheme is also developed, in which the
trapping wavelength is chosen to lie between two strong transitions of an
alkali atom such that the induced dipole moment is zero for that species but is
significant for any other. We compare these schemes by examining the trap
depths and heating rates associated with both. We find that the tune-in scheme
is preferable for Li-Na, Li-K, and K-Na mixtures, while the tune-out scheme is
preferable for Li-Cs, K-Rb, Rb-Cs, K-Cs and 39K-40K mixtures. Several
applications of species-selective optical lattices are explored, including the
creation of a lattice for a single species in the presence of a phonon-like
background, the tuning of relative effective mass, and the isothermal increase
of phase space density.
\\ ( http://arXiv.org/abs/cond-mat/0702034 , 332kb)
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Paper: cond-mat/0702045
Date: Fri, 2 Feb 2007 11:36:12 GMT (157kb)
Title: Limits to the analogue Hawking temperature in a Bose-Einstein condensate
Authors: S. Wuester and C.M. Savage
Categories: cond-mat.other
Comments: 8 pages, 4 figures
Subj-class: Other
\\
Quasi-one dimensional outflow from a dilute gas Bose-Einstein condensate
reservoir is a promising system for the creation of analogue Hawking radiation.
We use numerical modeling to show that stable sonic horizons exist in such a
system under realistic conditions, taking into account the transverse
dimensions and three-body loss. We find that loss limits the achievable
analogue Hawking temperatures, with sodium condensates allowing the highest
temperatures. A condensate of 30,000 atoms, with transverse confinement
frequency omega_perp=6800 2 pi Hz, yields horizon temperatures of about 20 nK
over a period of 50 ms. This is at least four times higher than for other atoms
commonly used for Bose-Einstein condensates.
\\ ( http://arXiv.org/abs/cond-mat/0702045 , 157kb)
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Paper: cond-mat/0702046
Date: Fri, 2 Feb 2007 20:58:51 GMT (9kb)
Title: Stochastic Gross-Pitaevsky Equation for BEC via Coarse-Grained Effective
Action
Authors: Esteban Calzetta, B. L. Hu, Enric Verdaguer
Categories: cond-mat.stat-mech
Comments: 6 pages
Subj-class: Statistical Mechanics
\\
We sketch the major steps in a functional integral derivation of a new set of
Stochastic Gross-Pitaevsky equations (GPE) for a Bose-Einstein condensate (BEC)
confined to a trap at zero temperature with the averaged effects of
non-condensate modes incorporated as stochastic sources. The closed-time-path
(CTP) coarse-grained effective action (CGEA) or the equivalent influence
functional method is particularly suitable because it can account for the full
back-reaction of the noncondensate modes on the condensate dynamics
self-consistently. The Langevin equations derived here containing nonlocal
dissipation together with colored and multiplicative noises are useful for a
stochastic (as distinguished from say, a kinetic) description of the
nonequilibrium dynamics of a BEC. This short paper contains original research
results not yet published anywhere.
\\ ( http://arXiv.org/abs/cond-mat/0702046 , 9kb)
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Paper: cond-mat/0702055
Date: Fri, 2 Feb 2007 19:05:52 GMT (940kb)
Title: Coherence properties of spinor condensates at finite temperatures
Authors: Krzysztof Gawryluk, Miroslaw Brewczyk, Mariusz Gajda, Kazimierz
Rzazewski
Categories: cond-mat.other
Comments: 5 pages, 4 figures
Subj-class: Other
\\
We consider a spinor condensate of 87Rb atoms in its F=1 hyperfine state at
finite temperatures. Putting initially all atoms in m_F=0 component we find
that the system evolves into the state of thermal equilibrium. This state is
approached in a step-like process and when established it manifests itself in
distinguishable ways. The atoms in states m_F=+1 and m_F=-1 start to rotate in
opposite directions breaking the chiral symmetry and showing highly regular
spin textures. Also the coherence properties of the system changes
dramatically. Depending on the strength of spin-changing collisions the system
first enters the stage where the m_F=+1 and m_F=-1 spinor condensate components
periodically loose and recover their mutual coherence whereas their thermal
counterparts get completely dephased. For stronger spin changing collisions the
system enters the regime where also the strong coherence between other
components is built up.
\\ ( http://arXiv.org/abs/cond-mat/0702055 , 940kb)
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Paper: physics/0702013
Date: Thu, 1 Feb 2007 21:52:27 GMT (200kb)
Title: Interfacing Collective Atomic Excitations and Single Photons
Authors: J. Simon, H. Tanji, J.K. Thompson, and V. Vuletic
Categories: physics.atom-ph
Comments: 4 pages, 4 figures, submitted to PRL
Subj-class: Atomic Physics
\\
We study the performance and limitations of a coherent interface between
collective atomic states and single photons. A quantized spin-wave excitation
of an atomic sample inside an optical resonator is prepared probabilistically,
stored, and adiabatically converted on demand into a sub-Poissonian photonic
excitation of the resonator mode. The measured peak single-quantum conversion
efficiency of 0.84(11) and its dependence on various parameters are well
described by a simple model of the mode geometry and multilevel atomic
structure, pointing the way towards implementing high-performance stationary
single-photon sources.
\\ ( http://arXiv.org/abs/physics/0702013 , 200kb)
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Paper: cond-mat/0702057
Date: Mon, 5 Feb 2007 19:32:51 GMT (115kb)
Title: Nematic Order by Disorder in Spin-2 BECs
Authors: Ari Turner, Ryan Barnett, Eugene Demler, and Ashvin Vishwanath
Categories: cond-mat.other
Comments: 5 pages, 4 figures
Subj-class: Other
\\
The effect of quantum and thermal fluctuations on the phase diagram of spin-2
BECs is examined. They are found to play an important role in the nematic part
of the phase diagram, where a mean-field treatment of two-body interactions is
unable to lift the accidental degeneracy between nematic states. Quantum and
thermal fluctuations resolve this degeneracy, selecting the uniaxial nematic
state, for scattering lengths $a_4>a_2$, and the square biaxial nematic state
for $a_4<a_2$. Paradoxically, the fluctuation induced order is stronger at
higher temperatures, for a range of temperatures below $T_c$. For the
experimentally relevant cases of spin-2 $^{87}$Rb and $^{23}$Na, we argue that
such fluctuations could successfully compete against other effects like the
quadratic Zeeman field, and stabilize the uniaxial phase for experimentally
realistic conditions. A continuous transition of the Ising type from uniaxial
to square biaxial order is predicted on raising the magnetic field. These
systems present a promising experimental opportunity to realize the `order by
disorder' phenomenon.
\\ ( http://arXiv.org/abs/cond-mat/0702057 , 115kb)
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Paper: cond-mat/0702058
Date: Mon, 5 Feb 2007 19:55:30 GMT (9kb)
Title: Is the excitation spectrum of an interacting Bose gas really gapless ?
Authors: A.M. Ettouhami (Univ. of Toronto)
Categories: cond-mat.stat-mech cond-mat.other
Comments: 5 pages
Subj-class: Statistical Mechanics; Other
\\
In Bogoliubov's theory of an interacting Bose gas, one does not diagonalize
the part $\hat{H}_2$ of the Hamiltonian that is quadratic in the boson creation
and annihilation operators, but instead one diagonalizes the "grand canonical"
Hamiltonian $\tilde{H}_2 = \hat{H}_2 - \mu \hat{N}_1$, where $\mu$ is the
chemical potential and the operator $\hat{N}_1$ counts the number of bosons
outside the condensate. In this paper, we argue that the ground state energy
and other thermodynamic quantities should be derived by diagonalizing
$\hat{H}_2$ rather than $\tilde{H}_2$, which results in a gapped excitation
spectrum. Gapped excitation spectra were derived previously, by a number of
authors, and were deemed unphysical on the grounds that such spectra violate
Goldstone's theorem. Here, we argue that such an interpretation stems from an
improper identification of the {\em collective} Goldstone modes of the system,
which have to do with the phase of the order parameter, whereas the spectrum of
$\hat{H}_2$ represents single-particle excitations.
\\ ( http://arXiv.org/abs/cond-mat/0702058 , 9kb)
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Paper: cond-mat/0702066
Date: Sun, 4 Feb 2007 03:43:40 GMT (907kb)
Title: Pairing of Strongly Interacting Fermions without Superfluidity
Authors: C. H. Schunck, Y. Shin, A. Schirotzek, M. W. Zwierlein, W. Ketterle
Categories: cond-mat.str-el
Subj-class: Strongly Correlated Electrons
\\
We use radio-frequency spectroscopy to study pairing in the normal and
superfluid phases of a strongly interacting Fermi gas with imbalanced spin
populations. At high spin imbalances the system cannot become superfluid even
at zero temperature. In this normal phase full pairing of the minority atoms is
observed. This demonstrates that mismatched Fermi surfaces do not prevent
pairing but quench the superfluid state, thus realizing a system of fermion
pairs that do not condense even at the lowest temperature.
\\ ( http://arXiv.org/abs/cond-mat/0702066 , 907kb)
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Paper: cond-mat/0702067
Date: Sun, 4 Feb 2007 05:34:09 GMT (57kb)
Title: Time-dependent quantum many-body theory of identical bosons in a double
well: Early time ballistic interferences of fragmented and number entangled
states
Authors: David J. Masiello, William P. Reinhardt
Categories: cond-mat.other
Comments: 13 pages, 3 figures
Subj-class: Other
\\
A time-dependent multiconfigurational self-consistent field theory is
presented to describe the many-body dynamics of a gas of identical bosonic
atoms confined to an external trapping potential at zero temperature from first
principles. A set of generalized evolution equations are developed, through the
time-dependent variational principle, which account for the complete and
self-consistent coupling between the expansion coefficients of each
configuration and the underlying one-body wave functions within a restricted
two state Fock space basis that includes the full effects of the condensate's
mean field as well as atomic correlation. The resulting dynamical equations are
a classical Hamiltonian system and, by construction, form a well-defined
initial value problem. They are implemented in an efficient numerical
algorithm. An example is presented, highlighting the generality of the theory,
in which the ballistic expansion of a fragmented condensate ground state is
compared to that of a macroscopic quantum superposition state, taken here to be
a highly entangled number state, upon releasing the external trapping
potential. Strikingly different many-body matter-wave dynamics emerge in each
case, accentuating the role of both atomic correlation and mean-field effects
in the two condensate states.
\\ ( http://arXiv.org/abs/cond-mat/0702067 , 57kb)
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Paper: cond-mat/0702068
Date: Sun, 4 Feb 2007 05:37:04 GMT (195kb)
Title: Measurement of energy eigenstates by a slow detector
Authors: I. Martin and W. H. Zurek
Categories: cond-mat.mes-hall
Comments: 4 pages
Subj-class: Mesoscopic Systems and Quantum Hall Effect
\\
We propose a method for a weak continuous measurement of the energy
eigenstates of a fast quantum system by means of a "slow" detector. Such a
detector is only sensitive to slowly-changing variables, e. g. energy, while
its back-action can be limited solely to decoherence of the eigenstate
superpositions. We apply this scheme to the problem of detection of quantum
jumps between energy eigenstates in a harmonic oscillator.
\\ ( http://arXiv.org/abs/cond-mat/0702068 , 195kb)
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Paper: cond-mat/0702094
Date: Mon, 5 Feb 2007 09:04:34 GMT (113kb)
Title: Collective Modes and Stability of Bose-Fermi Mixtures with a BCS-BEC
Crossover
Authors: Hiroyuki Shibata, Nobuhiko Yokoshi, Susumu Kurihara
Categories: cond-mat.other cond-mat.supr-con
Comments: 7 pages, 3 figures
Subj-class: Other; Superconductivity
\\
We investigate an ultracold Bose-Fermi mixture with a Feshbach resonance
between two hyperfine states of fermions. Using a functional integral method,
we calculate collective modes associated with fermion-pairs and bosons in a
superfluid phase. We derive a stability condition of the mixtures, which is
valid in the entire region of the BCS-BEC crossover. This stability condition,
which smoothly connects the well-known results obtained in both the BCS and BEC
limits, shows that sufficiently strong FB interactions destabilize the
mixtures. In order to investigate the consequence of this instability, we study
the ground state energy of both the uniformly mixed and the phase-separated
states. We find that the FB repulsion induces a phase separation, whereas the
FB attraction should cause a collapse of the mixture. The possibilities for the
experimental observation of such instabilities are also discussed.
\\ ( http://arXiv.org/abs/cond-mat/0702094 , 113kb)
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Paper: quant-ph/0702024
Date: Sat, 3 Feb 2007 02:03:52 GMT (7kb)
Title: Theory of decoherence in Bose-Einstein condensate interferometry
Authors: B J Dalton
Categories: quant-ph
Comments: Proceedings DICE 06 Conference, 11-15 Sept 2006, Piombino, Italy
\\
A full treatment of decoherence and dephasing effects in BEC interferometry
has been developed based on using quantum correlation functions for treating
interferometric effects. The BEC is described via a phase space distribution
functional of the Wigner type for the condensate modes and the positive P type
for the non-condensate modes. Ito equations for stochastic condensate and
non-condensate field functions replace the functional Fokker-Planck equation
for the distribution functional and stochastic averages of field function
products determine the quantum correlation functions.
\\ ( http://arXiv.org/abs/quant-ph/0702024 , 7kb)
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Paper: quant-ph/0702031
Date: Mon, 5 Feb 2007 01:37:03 GMT (73kb)
Title: A scheme for demonstration of fractional statistics of anyons in an
exactly solvable model
Authors: Y.-J. Han, R. Raussendorf, and L.-M. Duan
Categories: quant-ph
Comments: 4 pages, 3 figures
\\
We propose a scheme to demonstrate fractional statistics of anyons in an
exactly solvable lattice model proposed by Kitaev that involves four-body
interactions. The required many-body ground state, as well as the anyon
excitations and their braiding operations, can be conveniently realized through
\textit{dynamic}laser manipulation of cold atoms in an optical lattice. Due to
the perfect localization of anyons in this model, we show that a quantum
circuit with only six qubits is enough for demonstration of the basic braiding
statistics of anyons. This opens up the immediate possibility of
proof-of-principle experiments with trapped ions, photons, or nuclear magnetic
resonance systems.
\\ ( http://arXiv.org/abs/quant-ph/0702031 , 73kb)
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Paper: quant-ph/0702034
Date: Mon, 5 Feb 2007 13:20:41 GMT (757kb)
Title: A Single-Photon Server with Just One Atom
Authors: Markus Hijlkema, Bernhard Weber, Holger P. Specht, Simon C. Webster,
Axel Kuhn and Gerhard Rempe
Categories: quant-ph
Comments: 4 pages, 3 figures
\\
Neutral atoms are ideal objects for the deterministic processing of quantum
information. Entanglement operations have been performed by photon exchange or
controlled collisions. Atom-photon interfaces were realized with single atoms
in free space or strongly coupled to an optical cavity. A long standing
challenge with neutral atoms, however, is to overcome the limited observation
time. Without exception, quantum effects appeared only after ensemble
averaging. Here we report on a single-photon source with one-and-only-one atom
quasi permanently coupled to a high-finesse cavity. Quasi permanent refers to
our ability to keep the atom long enough to, first, quantify the
photon-emission statistics and, second, guarantee the subsequent performance as
a single-photon server delivering up to 300,000 photons for up to 30 seconds.
This is achieved by a unique combination of single-photon generation and atom
cooling. Our scheme brings truly deterministic protocols of quantum information
science with light and matter within reach.
\\ ( http://arXiv.org/abs/quant-ph/0702034 , 757kb)
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Paper: quant-ph/0702039
Date: Mon, 5 Feb 2007 16:58:49 GMT (357kb)
Title: Subwavelength addressability and spin-dependent transport in a
double-well optical lattice
Authors: P. J. Lee, M. Anderlini, B. L. Brown, J. Sebby-Strabley, W. D.
Phillips, J. V. Porto
Categories: quant-ph
\\
We report the experimental demonstration of site-selective RF addressing of
atoms with sub-wavelength resolution in a spin-dependent optical lattice of
double wells. We also show spin-dependent transport: coherent spatial
separation of atomic wave packets into adjacent sites according to their
internal state. These tools will be useful for quntum information processing
with neutral atoms in an optical lattice.
\\ ( http://arXiv.org/abs/quant-ph/0702039 , 357kb)
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Paper: quant-ph/0702041
Date: Mon, 5 Feb 2007 18:27:15 GMT (854kb)
Title: Mapping broadband single-photon wavepackets into an atomic memory
Authors: J. Nunn, I. A. Walmsley, M. G. Raymer, K. Surmacz, F. C. Waldermann,
Z. Wang, D. Jaksch
Categories: quant-ph
Comments: 5 pages, 4 figures, published in PRA Rapid Communications
Journal-ref: Phys. Rev. A 75, 011401(R) (2007)
DOI: 10.1103/PhysRevA.75.011401
\\
We analyze a quantum optical memory based on the off-resonant Raman
interaction of a single broadband photon, copropagating with a classical
control pulse, with an atomic ensemble. The conditions under which the memory
can perform optimally are found, by means of a `universal' mode decomposition.
This enables the memory efficiency to be specified in terms of a single
parameter, and the control field pulse shape to be determined via a simple
nonlinear scaling. We apply the same decomposition to determine the optimal
configurations for read-out.
\\ ( http://arXiv.org/abs/quant-ph/0702041 , 854kb)
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Paper: physics/0702025
Date: Sat, 3 Feb 2007 00:30:52 GMT (366kb)
Title: Bright Source of Cold Ions for Surface-Electrode Traps
Authors: Marko Cetina, Andrew Grier, Jonathan Campbell, Isaac Chuang and Vladan
Vuletic
Categories: physics.atom-ph
Comments: Paper submitted to PRL for review on 2/1/06
Subj-class: Atomic Physics
\\
We produce large numbers of low-energy ions by photoionization of
laser-cooled atoms inside a surface-electrode-based Paul trap. The
isotope-selective trap loading rate of $4\times10^{5}$ Yb$^{+}$ ions/s exceeds
that attained by photoionization (electron impact ionization) of an atomic beam
by four (six) orders of magnitude. Traps as shallow as 0.13 eV are easily
loaded with this technique. The ions are confined in the same spatial region as
the laser-cooled atoms, which will allow the experimental investigation of
interactions between cold ions and cold atoms or Bose-Einstein condensates.
\\ ( http://arXiv.org/abs/physics/0702025 , 366kb)
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Paper: cond-mat/0702122
Date: Mon, 5 Feb 2007 23:27:12 GMT (838kb)
Title: Condensed Matter Physics With Light And Atoms: Strongly Correlated Cold
Fermions in Optical Lattices
Authors: Antoine Georges
Categories: cond-mat.str-el cond-mat.stat-mech
Comments: Lectures given at the Enrico Fermi Summer School on "Ultracold Fermi
Gases", organized by M. Inguscio, W. Ketterle and C. Salomon (Varenna, Italy,
June 2006)
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
\\
Various topics at the interface between condensed matter physics and the
physics of ultra-cold fermionic atoms in optical lattices are discussed. The
lectures start with basic considerations on energy scales, and on the regimes
in which a description by an effective Hubbard model is valid. Qualitative
ideas about the Mott transition are then presented, both for bosons and
fermions, as well as mean-field theories of this phenomenon. Antiferromagnetism
of the fermionic Hubbard model at half-filling is briefly reviewed. The
possibility that interaction effects facilitate adiabatic cooling is discussed,
and the importance of using entropy as a thermometer is emphasized. Geometrical
frustration of the lattice, by suppressing spin long-range order, helps
revealing genuine Mott physics and exploring unconventional quantum magnetism.
The importance of measurement techniques to probe quasiparticle excitations in
cold fermionic systems is emphasized, and a recent proposal based on stimulated
Raman scattering briefly reviewed. The unconventional nature of these
excitations in cuprate superconductors is emphasized.
\\ ( http://arXiv.org/abs/cond-mat/0702122 , 838kb)
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Paper: cond-mat/0702123
Date: Mon, 5 Feb 2007 23:54:09 GMT (76kb)
Title: Thermodynamics of a Bose-Einstein Condensate with Weak Disorder
Authors: G. M. Falco, A. Pelster, R. Graham
Categories: cond-mat.other
Comments: 11 pages, 5 figures
Subj-class: Other
\\
We consider the thermodynamics of a homogeneous superfluid dilute Bose gas in
the presence of weak quenched disorder. Following the zero-temperature approach
of Huang and Meng, we diagonalize the Hamiltonian of a dilute Bose gas in an
external random delta-correlated potential by means of a Bogoliubov
transformation. We extend this approach to finite temperature by combining the
Popov and the many-body T-matrix approximations. This approach permits us to
include the quasi-particle interactions within this temperature range. We
derive the disorder-induced shifts of the Bose-Einstein critical temperature
and of the temperature for the onset of superfluidity by approaching the
transition points from below, i.e., from the superfluid phase. Our results lead
to a phase diagram consistent with that of the finite-temperature theory of
Lopatin and Vinokur which was based on the replica method, and in which the
transition points were approached from above.
\\ ( http://arXiv.org/abs/cond-mat/0702123 , 76kb)
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Paper: cond-mat/0702133
Date: Tue, 6 Feb 2007 09:17:40 GMT (224kb)
Title: Observation of a Glassy Phase in Solid 4He in the Supersolidity Region
Authors: V.N.Grigorev, V.A.Maidanov, V.Yu.Rubanskii, S.P.Rubets,
E.Ya.Rudavskii, A.S.Rybalko, Ye.V.Syrnikov, and V.A.Tikhii
Categories: cond-mat.dis-nn
Comments: 11 pages, 3 figures
Subj-class: Disordered Systems and Neural Networks
\\
High-precision pressure measurements in solid 4He, grown by the capillary
blocking technique, have been made in temperatures range from 50 to 500 mK. The
temperature dependence of pressure indicates that aside from the usual phonon
contribution ~T^4, there is an additional contribution ~ T^2, the latter
becoming dominant at temperatures T < 300 mK, where an abnormal behavior
attributed to supersolidity has been observed. The data suggest the appearance
of a glassy phase (that might be responsible for the anomalous behaviors
observed previously).
\\ ( http://arXiv.org/abs/cond-mat/0702133 , 224kb)
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Paper: cond-mat/0702142
Date: Tue, 6 Feb 2007 14:20:19 GMT (957kb)
Title: Persistent Supercurrent Atom Chip
Authors: T. Mukai, C. Hufnagel, A. Kasper, T. Meno, A. Tsukada, K. Semba, and
F. Shimizu
Categories: cond-mat.supr-con cond-mat.other
Comments: 4 pages, 5 figures
Subj-class: Superconductivity; Other
\\
Rubidium 87 atoms are trapped in an Ioffe-Pritchard potential generated with
a persistent supercurrent that flows in a loop circuit patterned on a sapphire
surface. The superconducting circuit is a closed loop made of 100 micro meter
wide MBE-grown MgB2 stripe carrying a supercurrent of 2.5 A. To control the
supercurrent in the stripe, an on-chip thermal switch operated by a focused
argon-ion laser is developed. The switch operates as an on/off switch of the
supercurrent, or as a device to set the current to a specific value with the
aid of an external magnetic field. The current can be set even without an
external source if the change is in decreasing direction.
\\ ( http://arXiv.org/abs/cond-mat/0702142 , 957kb)
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Paper: cond-mat/0702154
Date: Tue, 6 Feb 2007 18:12:22 GMT (163kb)
Title: Nearly-one-dimensional self-attractive Bose-Einstein condensates in
optical lattices
Authors: L. Salasnich, A. Cetoli, B. A. Malomed and F. Toigo
Categories: cond-mat.other cond-mat.stat-mech
Comments: 9 pages, 8 figures, 2 tables
Subj-class: Other; Statistical Mechanics
\\
Within the framework of the mean-field description, we investigate atomic
Bose-Einstein condensates (BECs), with attraction between atoms, under the
action of strong transverse confinement and periodic (optical-lattice, OL)
axial potential. Using a combination of the variational approximation (VA),
one-dimensional (1D) nonpolynomial Schr\"{o}dinger equation (NPSE), and direct
numerical solutions of the underlying 3D Gross-Pitaevskii equation (GPE), we
show that the ground state of the condensate is a soliton belonging to the
semi-infinite bandgap of the periodic potential. The soliton may be confined to
a single cell of the lattice, or extend to several cells, depending on the
effective self-attraction strength, $g$ (which is proportional to the number of
atoms bound in the soliton), and depth of the potential, $V_{0}$, the increase
of $V_{0}$ leading to strong compression of the soliton. We demonstrate that
the OL is an effective tool to control the soliton's shape. It is found that,
due to the 3D character of the underlying setting, the ground-state soliton
collapses at a critical value of the strength, $g=g_{c}$, which gradually
decreases with the increase of the depth of the periodic potential, $V_{0}$;
under typical experimental conditions, the corresponding maximum number of
$^{7}$Li atoms in the soliton, $N_{\max}$, ranges between $8,000$ and $4,000$.
Examples of stable multi-peaked solitons are also found in the first finite
bandgap of the lattice spectrum. The respective critical value $g_{c}$ again
slowly decreases with the increase of $V_{0}$, corresponding to $N_{\max
}\simeq 5,000$.
\\ ( http://arXiv.org/abs/cond-mat/0702154 , 163kb)
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Paper: cond-mat/0702156
Date: Tue, 6 Feb 2007 19:02:20 GMT (241kb)
Title: Vortices, antivortices and superfluid shells separating Mott-insulating
regions
Authors: Kaushik Mitra, C. J. Williams, C. A. R. Sa de Melo
Categories: cond-mat.other
Comments: 4 pages, 3 figures
Subj-class: Other
\\
Atomic or molecular bosons in harmonically confined optical lattices exhibit
a wedding cake structure consisting of insulating (Mott) shells. It is shown
that superfluid regions emerge between Mott shells as a result of fluctuations
due to finite hopping. It is found that the order parameter equation in the
superfluid region is not of the Gross-Pitaeviskii type except near the
insulator to superfluid boundaries. The excitation spectra in the Mott and
superfluid regions are obtained, and it is shown that the superfluid shells
posses low energy sound modes with spatially dependent sound velocity described
by a local index of refraction directly related to the local superfluid
density. Lastly, the Berezinskii-Kosterlitz-Thouless transition and
vortex-antivortex pairs are discussed in thin (wide) superfluid shells (rings)
limited by three (two) dimensional Mott regions.
\\ ( http://arXiv.org/abs/cond-mat/0702156 , 241kb)
------------------------------------------------------------------------------
\\
Paper: quant-ph/0702053
Date: Tue, 6 Feb 2007 15:07:08 GMT (344kb)
Title: Resonance fluorescence of a cold atom in a high-finesse resonator
Authors: Marc Bienert, J. Mauricio Torres, Stefano Zippilli, Giovanna Morigi
Categories: quant-ph
Comments: 10 pages, 7 figures
\\
We study the spectra of emission of a system composed by an atom, tightly
confined inside a high-finesse resonator, when the atom is driven by a laser
and is at steady state of the cooling dynamics induced by laser and cavity
field. In general, the spectrum of resonance fluorescence and the spectrum at
the cavity output contain complementary information about the dynamics
undergone by the system. In certain parameter regimes, quantum interference
effects between the scattering processes induced by cavity and laser field lead
to the selective suppression of features of the resonance fluorescence
spectrum, which are otherwise visible in the spectrum of laser-cooled atoms in
free space.
\\ ( http://arXiv.org/abs/quant-ph/0702053 , 344kb)
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\\
Paper: quant-ph/0702054
Date: Tue, 6 Feb 2007 15:32:58 GMT (123kb)
Title: Strongly-Driven One-Atom Laser
Authors: P. Lougovski, F. Casagrande, A. Lulli, E. Solano
Categories: quant-ph
Comments: 9 pages, 9 figures
\\
We propose the implementation of a strongly-driven one-atom laser, based on
the off-resonant interaction of a three-level atom in $\Lambda$-configuration
with a single cavity mode and three laser fields. We show that the system can
be described equivalently by a two-level atom coupled to the cavity and driven
by a strong effective coherent field, yielding Schr\"odinger cat states. The
effective dynamics can be solved exactly, including a thermal field bath,
allowing an analytical description of field statistics and entanglement
properties, as well as of the environment-induced decoherence of atom-field
pure states. Finally, we propose a way to monitor the decoherence of these
states by measuring atomic populations and confirm the validity of our model
through full numerical solutions.
\\ ( http://arXiv.org/abs/quant-ph/0702054 , 123kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702159
Date: Tue, 6 Feb 2007 22:52:55 GMT (239kb)
Title: Superfluidity of Grain Boundaries in Solid Helium-4
Authors: L. Pollet, M. Boninsegni, A. B. Kuklov, N. V. Prokof'ev, B. V.
Svistunov, M. Troyer
Categories: cond-mat.stat-mech cond-mat.other
Subj-class: Statistical Mechanics; Other
\\
By large-scale quantum Monte Carlo simulations we show that grain boundaries
in Helium-4 crystals are generically superfluid at low temperature, with a
transition temperature of the order of ~0.5K at the melting pressure;
insulating grain boundaries are found only for special orientations of the
grains. We also find that close vicinity to the melting line is not a necessary
condition for superfluid grain boundaries, and a grain boundary in direct
contact with the superfluid liquid at the melting curve is found to be
mechanically stable and the grain boundary superfluidity observed by Sasaki et
al. [Science 313, 1098 (2006)] is not just a crack filled with superfluid.
\\ ( http://arXiv.org/abs/cond-mat/0702159 , 239kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702175
Date: Wed, 7 Feb 2007 14:29:07 GMT (303kb)
Title: Bright solitons and soliton trains in a fermion-fermion mixture
Authors: Sadhan K. Adhikari
Categories: cond-mat.other
Comments: 5 pages, 7 figures
Subj-class: Other
Journal-ref: EUROPEAN PHYSICAL JOURNAL D 40 (2006) 157-160
\\
We use a time-dependent dynamical mean-field-hydrodynamic model to predict
and study bright solitons in a degenerate fermion-fermion mixture in a
quasi-one-dimensional cigar-shaped geometry using variational and numerical
methods. Due to a strong Pauli-blocking repulsion among identical
spin-polarized fermions at short distances there cannot be bright solitons for
repulsive interspecies fermion-fermion interactions. However, stable bright
solitons can be formed for a sufficiently attractive interspecies interaction.
We perform a numerical stability analysis of these solitons and also
demonstrate the formation of soliton trains. These fermionic solitons can be
formed and studied in laboratory with present technology.
\\ ( http://arXiv.org/abs/cond-mat/0702175 , 303kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702178
Date: Wed, 7 Feb 2007 15:36:02 GMT (249kb)
Title: Excited Thomas-Efimov levels in ultracold gases
Authors: Mark D. Lee, Thorsten Koehler, Paul S. Julienne
Categories: cond-mat.other
Comments: 16 pages, 10 eps figures
Subj-class: Other
\\
Since the early days of quantum physics, the complex behavior of three
interacting particles has been the subject of numerous experimental and
theoretical studies. In a recent Letter to Nature, Kraemer et al. [Nature
(London) 440, 315 (2006)] report on experimental ``evidence for Efimov quantum
states'' in an ultracold gas of cesium atoms. Such quantum states refer to an
infinite series of energy levels of three identical Bose particles,
accumulating at the threshold for dissociation as the scattering length of each
pair is tuned to infinity. Whereas the existence of a single Efimov state has
been predicted for three helium atoms, earlier experimental studies concluded
that this elusive state had not been found. In this paper we show by an
intuitive argument and full numerical calculations that the helium and cesium
experiments actually provide evidence of the same, ground state of this trimer
spectrum, which the helium experimentalists and pioneering theoretical studies
had not associated with Efimov's effect. Unlike the helium trimer, the observed
133Cs_3 resonance refers to a Borromean molecular state. We discuss how as yet
unobserved, excited Efimov quantum states might be detected in ultracold gases
of 85Rb and of 133Cs at magnetic field strengths in the vicinity of 0.08 T (800
G).
\\ ( http://arXiv.org/abs/cond-mat/0702178 , 249kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702183
Date: Wed, 7 Feb 2007 17:17:04 GMT (516kb)
Title: Coherent Matter Wave Transport in Speckle Potentials
Authors: R.C. Kuhn, O. Sigwarth, C. Miniatura, D. Delande, C.A. Mueller
Categories: cond-mat.other
Comments: 33 pages
Subj-class: Other
\\
This article studies multiple scattering of matter waves by a disordered
optical potential in two and in three dimensions. We calculate fundamental
transport quantities such as the scattering mean free path $\ell_s$, the
Boltzmann transport mean free path $\elltrb$, and the Boltzmann diffusion
constant $D_B$, using a diagrammatic Green functions approach. Coherent
multiple scattering induces interference corrections known as weak localization
which entail a reduced diffusion constant. We derive the corresponding
expressions for matter wave transport in an correlated speckle potential and
provide the relevant parameter values for a possible experimental study of this
coherent transport regime, including the critical crossover to the regime of
strong or Anderson localization.
\\ ( http://arXiv.org/abs/cond-mat/0702183 , 516kb)
------------------------------------------------------------------------------
\\
Paper: quant-ph/0702067
Date: Wed, 7 Feb 2007 13:56:19 GMT (89kb)
Title: Spatial Entanglement From Off-Diagonal Long Range Order in a BEC
Authors: Libby Heaney, Janet Anders, Dagomir Kaszlikowski, Vlatko Vedral
Comments: 4 pages, 2 figures
\\
We quantify the spatial entanglement in an ideal bosonic gas around the
transition temperature for condensation by probing the gas with two localised
quantum harmonic oscillators. We show that spatial entanglement in the gas is
directly related to the off diagonal long range order (ODLRO) of the system and
hence to the onset of condensation.
\\ ( http://arXiv.org/abs/quant-ph/0702067 , 89kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702191
Date: Thu, 8 Feb 2007 01:03:46 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
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
\\
We investigate quantum phase transitions and pairing signature in the
one-dimensional two-component Fermi atomic gas with an external field. The
phase diagram, critical fields, magnetization and local pairing correlation are
obtained analytically via the exact thermodynamic Bethe ansatz. At zero
temperature, bound pairs of fermions with opposite spin states form a singlet
ground state when the external field $H < H_{c1}$. A completely ferromagnetic
phase without pairing occurs when the external field $H > H_{c2}$. In the
region $H_{c1} < H < H_{c2}$ we observe a mixed phase of matter in which paired
and unpaired atoms coexist. The phase diagram is reminiscent of that of type II
superconductors. For temperatures below the degenerate temperature and in the
absence of external field, the bound pairs of fermions form hard-core bosons
obeying generalized exclusion statistics.
\\ ( http://arXiv.org/abs/cond-mat/0702191 , 50kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702195
Date: Thu, 8 Feb 2007 07:44:07 GMT (379kb)
Title: Mean field thermodynamics of a spin-polarized spherically trapped Fermi
gas at unitarity
Authors: Xia-Ji Liu, Hui Hu, and Peter D. Drummond
Categories: cond-mat.str-el cond-mat.stat-mech
Comments: 13 pages + 9 figures; to appear in Phys. Rev. A
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
\\
We calculate the mean-field thermodynamics of a spherically trapped Fermi gas
with unequal spin populations in the unitarity limit, comparing results from
the Bogoliubov-de Gennes equations and the local density approximation. We
follow the usual mean-field decoupling in deriving the Bogoliubov-de Gennes
equations and set up an efficient and accurate method for solving these
equations. In the local density approximation we consider locally homogeneous
solutions, with a slowly varying order parameter. With a large particle number
these two approximation schemes give rise to essentially the same results for
various thermodynamic quantities, including the density profiles. This
excellent agreement strongly indicates that the small oscillation of order
parameters near the edge of trap, sometimes interpreted as spatially
inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov states in previous studies of
Bogoliubov-de Gennes equations, is a finite size effect. We find that a bimodal
structure emerges in the density profile of the minority spin state at finite
temperature, as observed in experiments. The superfluid transition temperature
as a function of the population imbalance is determined, and is shown to be
consistent with recent experimental measurements. The temperature dependence of
the equation of state is discussed.
\\ ( http://arXiv.org/abs/cond-mat/0702195 , 379kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702215
Date: Thu, 8 Feb 2007 14:55:22 GMT (13kb)
Title: Bose-Einstein condensation and Casimir effect for ideal Bose Gas
confined between two slabs
Authors: Shyamal Biswas
Categories: cond-mat.stat-mech
Comments: 4 pages,1 figure
Subj-class: Statistical Mechanics
\\
We study the Casimir effect for a 3-d system of ideal Bose gas in a slab
geometry with Dirichlet boundary condition. We calculate the temperature($T$)
dependence of the Casimir force below and above the Bose-Einstein condensation
temperature($T_c$). At $T\le T_c$ the Casimir force vanishes as
$[\frac{T}{T_c}]^{3/2}$. For $T\gtrsim T_c$ it weakly depends on temperature.
For $T\gg T_c$ it vanishes as $[\frac{T_c}{T}]^{3/2}$. At finite temperatures
this force for thermalized photons in between two plates has a classical
expression which is independent of $\hbar$. At finite temperatures the Casimir
force for our system depends on $\hbar$.
\\ ( http://arXiv.org/abs/cond-mat/0702215 , 13kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702216
Date: Thu, 8 Feb 2007 16:09:58 GMT (127kb)
Title: Spatially resolved photo ionization of ultracold atoms on an atom chip
Authors: S. Kraft, A. G\"{u}nther, J. Fort\'{a}gh, and C. Zimmermann
Categories: cond-mat.other
Subj-class: Other
\\
We report on photo ionization of ultracold magnetically trapped Rb atoms on
an atom chip. The atoms are trapped at 5 $\mu $K in a strongly anisotropic
trap. Through a hole in the chip with a diameter of 150 $\mu $m two laser beams
are focussed onto a fraction of the atomic cloud. A first laser beam with a
wavelength of 778 nm excites the atoms via a two photon transition to the 5D
level. With a fiber laser at 1080 nm the excited atoms are photo ionized.
Ionization leads to depletion of the atomic density distribution observed by
absorption imaging. The resonant ionization spectrum is reported. The setup
used in this experiment is not only suitable to investigate BEC ion mixtures
but also single atom detection on an atom chip.
\\ ( http://arXiv.org/abs/cond-mat/0702216 , 127kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0702223
Date: Thu, 8 Feb 2007 20:45:41 GMT (107kb)
Title: Coherent state path integral and super-symmetry for condensates composed
of bosonic and fermionic atoms
Authors: Bernhard Mieck
Categories: cond-mat.stat-mech
Comments: 117 pages; a second part, particularly applicable for d=2 spatial
dimensions, is in preparation
Subj-class: Statistical Mechanics
\\
A super-symmetric coherent state path integral on the Keldysh time contour is
considered for bosonic and fermionic atoms which interact among each other with
a common short-ranged two-body potential. We investigate the symmetries of
Bose-Einstein condensation for the equivalent bosonic and fermionic
constituents and specialize on the examination of super-symmetries for pair
condensate terms. A Hubbard-Stratonovich transformation from 'Nambu'-doubled
super-fields leads to a generating function with super-matrices for the
self-energy whose manifold is given by the ortho-symplectic super-group
Osp(S,S|2L). Effective equations are derived for anomalous terms which are
related to the molecular- and BCS- condensate pairs. A change of integration
measure for the coset decomposition Osp(S,S|2L)/U(L|S)xU(L|S) is performed,
including a separation of density and anomalous parts of the self-energy with a
gradient expansion for the Goldstone modes. The independent anomalous fields in
the actions can be transformed by the inverse square root of the metric tensor
of Osp(S,S|2L)/U(L|S) so that the coset integration measure with the
super-Jacobi-determinant can be removed from the coherent state path integral
and Gaussian-like integrations remain. The variations of the independent coset
fields in the effective actions result in classical field equations for a
nonlinear sigma model with the anomalous terms.
\\ ( http://arXiv.org/abs/cond-mat/0702223 , 107kb)
------------------------------------------------------------------------------
And if you still want to keep reading, the replacements:
------------------------------------------------------------------------------
\\
Paper: physics/0611237
replaced with revised version Mon, 29 Jan 2007 15:24:51 GMT (177kb)
Title: Interaction-induced crossover versus finite-size condensation in a
weakly interacting trapped 1D Bose gas
Authors: Isabelle Bouchoule (LCFIO), Karen V. Kheruntsyan (ARC Centre of
Excellence for Quantum-Atom Optics), Gora Shlyapnikov (LPTMS)
Categories: physics.atom-ph cond-mat.other cond-mat.stat-mech
Comments: 4 pages
Proxy: ccsd hal-00116204
Subj-class: Atomic Physics; Other; Statistical Mechanics
\\ ( http://arXiv.org/abs/physics/0611237 , 177kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0604476
replaced with revised version Fri, 2 Feb 2007 19:03:47 GMT (147kb)
Title: Relaxation in a Completely Integrable Many-Body Quantum System: An Ab
Initio Study of the Dynamics of the Highly Excited States of Lattice
Hard-Core Bosons
Authors: Marcos Rigol (1), Vanja Dunjko (2), Vladimir Yurovsky (3), Maxim
Olshanii (2) ((1) UC Davis, (2) USC, (3) U Tel Aviv)
Categories: cond-mat.other
Comments: 4 pages, 2 figures, published version
Subj-class: Other
Journal-ref: Phys. Rev. Lett. 98, 050405 (2007)
DOI: 10.1103/PhysRevLett.98.050405
\\ ( http://arXiv.org/abs/cond-mat/0604476 , 147kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0605278
replaced with revised version Fri, 2 Feb 2007 15:24:07 GMT (363kb)
Title: Entanglement and Quantum Noise Due to a Thermal Bosonic Field
Authors: Dmitry Solenov, Denis Tolkunov, Vladimir Privman
Categories: cond-mat.mes-hall
Comments: 12 pages, 9 figures; typos corrected
Report-no: VP-197
Subj-class: Mesoscopic Systems and Quantum Hall Effect
Journal-ref: Phys. Rev. B 75, 035134 (2007)
DOI: 10.1103/PhysRevB.75.035134
\\ ( http://arXiv.org/abs/cond-mat/0605278 , 363kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0611421
replaced with revised version Sat, 3 Feb 2007 00:19:12 GMT (41kb)
Title: Pairing in Asymmetrical Fermi Systems with Intra- and Inter-Species
Correlations
Authors: Renyuan Liao and Khandker F. Quader (Dept of Physics, Kent State
University)
Categories: cond-mat.supr-con cond-mat.str-el nucl-th physics.atom-ph
Comments: Contents revised. Added references
Subj-class: Superconductivity; Strongly Correlated Electrons; Atomic Physics
\\ ( http://arXiv.org/abs/cond-mat/0611421 , 41kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0701739
replaced with revised version Mon, 5 Feb 2007 09:48:01 GMT (34kb)
Title: Accurate determination of the superfluid-insulator transition in the
one-dimensional Bose-Hubbard model
Authors: Jakub Zakrzewski and Dominique Delande
Categories: cond-mat.stat-mech cond-mat.other
Comments: revised version, modified fig.1, a reference added, 5pp. 3figs
Subj-class: Statistical Mechanics; Other
\\ ( http://arXiv.org/abs/cond-mat/0701739 , 34kb)
------------------------------------------------------------------------------
\\
Paper (*cross-listing*): math-ph/0610034
replaced with revised version Sun, 4 Feb 2007 21:37:41 GMT (14kb)
Title: Bose-Einstein Condensation and Spontaneous Symmetry Breaking
Authors: Elliott H. Lieb, Robert Seiringer, Jakob Yngvason
Categories: math-ph cond-mat.stat-mech math.MP
Comments: Contribution to the proceedings of the 21st Max Born Symposium,
Wroclaw, Poland, June 26--28, 2006. (References added. To be published in
Reports on Mathematical Physics.)
Subj-class: Mathematical Physics; Statistical Mechanics
\\ ( http://arXiv.org/abs/math-ph/0610034 , 14kb)
------------------------------------------------------------------------------
\\
Paper: quant-ph/0601012
replaced with revised version Sat, 3 Feb 2007 03:44:53 GMT (641kb)
Title: Two-Mode Theory of BEC Interferometry
Authors: B J Dalton
Categories: quant-ph
Comments: Four figures (7 files)
\\ ( http://arXiv.org/abs/quant-ph/0601012 , 641kb)
------------------------------------------------------------------------------
\\
Paper: quant-ph/0603216
replaced with revised version Sun, 4 Feb 2007 17:49:16 GMT (545kb)
Title: Improving Raman velocimetry of laser-cooled cesium atoms by
spin-polarization
Authors: Julien Chab\'{e} (PhLAM, CERLA), Hans Lignier (PhLAM, CERLA), Pascal
Szriftgiser (PhLAM, CERLA), Jean Claude Garreau (PhLAM, CERLA)
Categories: quant-ph cond-mat.other physics.atom-ph physics.optics
Comments: 12 pages, 6 figures, Elsevier style, to appear in Opt. Commun
Proxy: ccsd ccsd-00021689
Subj-class: Quantum Physics; Optics; Atomic Physics; Other
\\ ( http://arXiv.org/abs/quant-ph/0603216 , 545kb)
------------------------------------------------------------------------------
\\
Paper: quant-ph/0701132
replaced with revised version Sat, 3 Feb 2007 14:11:35 GMT (714kb)
Title: Topological stability of stored optical vortices
Authors: R. Pugatch, M. Shuker, O. Firstenberg, A. Ron, N. Davidson
Categories: quant-ph
Comments: 4 pages, 4 figures v2: minor grammatical corrections v3: problem with
references fixed v4: minor clarifications added to the text
\\ ( http://arXiv.org/abs/quant-ph/0701132 , 714kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0611740
replaced with revised version Tue, 6 Feb 2007 02:33:02 GMT (380kb)
Title: Josephson probe of Fulde-Ferrell-Larkin-Ovchinnikov phases in atomic
Fermi gases
Authors: Hui Hu & Xia-Ji Liu
Categories: cond-mat.supr-con cond-mat.str-el
Comments: 5 pages, 3 figures; references added
Subj-class: Superconductivity; Strongly Correlated Electrons
\\ ( http://arXiv.org/abs/cond-mat/0611740 , 380kb)
------------------------------------------------------------------------------
\\
Paper (*cross-listing*): math-ph/0606058
replaced with revised version Tue, 6 Feb 2007 08:25:28 GMT (28kb)
Title: Rapidly Rotating Bose-Einstein Condensates in Strongly Anharmonic Traps
Authors: M. Correggi, T. Rindler-Daller, J. Yngvason
Categories: math-ph cond-mat.stat-mech math.MP
Comments: LaTex2e, 28 pages, revised version to be published in Journal of
Mathematical Physics
Subj-class: Mathematical Physics; Statistical Mechanics
MSC-class: 35Q55, 47J30, 76M23
\\ ( http://arXiv.org/abs/math-ph/0606058 , 28kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0510407
replaced with revised version Wed, 7 Feb 2007 15:08:54 GMT (130kb)
Title: Functional Integral for Ultracold Fermionic Atoms
Authors: S. Diehl, C. Wetterich
Categories: cond-mat.supr-con
Comments: 39 pages, 11 figures
Subj-class: Superconductivity
\\ ( http://arXiv.org/abs/cond-mat/0510407 , 130kb)
------------------------------------------------------------------------------
\\
Paper (*cross-listing*): nucl-th/0612086
replaced with revised version Wed, 7 Feb 2007 18:00:41 GMT (142kb)
Title: Effective Field Theory for Dilute Fermions with Pairing
Authors: R.J. Furnstahl, H.-W. Hammer, S.J. Puglia
Categories: nucl-th cond-mat.supr-con
Comments: 31 pages, 10 figures, affiliation updated, paper unchanged
Report-no: HISKP-TH-06-40
Subj-class: Nuclear Theory; Superconductivity
\\ ( http://arXiv.org/abs/nucl-th/0612086 , 142kb)
------------------------------------------------------------------------------
\\
Paper: cond-mat/0602108
replaced with revised version Thu, 8 Feb 2007 11:06:01 GMT (322kb)
Title: Supersonic optical tunnels for Bose-Einstein condensates
Authors: S. Wuester and B. J. Dabrowska-Wuester
Categories: cond-mat.other
Comments: 13 pages, 3 figures, major revision
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0602108 , 322kb)
------------------------------------------------------------------------------
And finally the workshop:
> **********************************************
> International Workshop on Quantum Noise
> **********************************************
>
> incorporating a Symposium to celebrate Crispin Gardiner's
> contributions to Quantum Optics and Atom Optics
>
> 14 - 18 MAY 2007
> BreakFree Grand Pacific resort,
> Caloundra, Queensland
> Australia
>
> http://www.acqao.org/qn
>
> CALL FOR PAPERS
> Abstract submission page is now open. Please use the online form to submit a title
> and short (50-100 word) abstract by 23rd February. Notification of acceptance will
> be issued by 2nd March.
>
> FOCUS
> The workshop will cover hot topics in quantum optics and ultracold quantum gases,
> from both theory and experiment. A particular focus will be on quantum aspects of
> matter waves and macroscopic quantum states, going beyond the methods and
> predictions of mean-field theory. This will include advances in analytical and
> computational methods, the latest experimental results probing the quantum nature
> of BECs, and applications of BEC to quantum information.
>
> TOPICS
> ? Quantum optics and atom optics
> ? Recent advances in BEC physics
> ? Degenerate Fermi gases and Bose-Fermi mixtures
> ? Stochastic methods and novel computational techniques
> ? Bosons and fermions in lattices
> ? Atom-molecular BEC
> ? Atom-light entanglement
> ? Macroscopic tests of quantum mechanics
>
> INVITED SPEAKERS
> Brian Anderson - University of Arizona, USA
> Rob Ballagh - University of Otago, New Zealand
> Howard Carmichael - University of Auckland, New Zealand
> Subhash Chaturvedi - University of Hyderabad, India
> Matthew Collett - University of Auckland, New Zealand
> Crispin Gardiner - University of Otago, New Zealand
> Ed Hinds - Imperial College, UK
> Gerd Leuchs - University Erlangen-Nuremberg, Germany
> Scott Parkins - University of Auckland, New Zealand
> Silvania Pereira - Delft University of Technology, The Netherlands
> Matthias Troyer - ETH Zurich, Switzerland
> Chris Westbrook - Institut d'Optique, Orsay, France
> Peter Zoller - Universität Innsbruck, Austria
>
> DATES:
> ? Abstract submission: 23 February 2007
> ? Early registration: 16 March 2007
>
> FEES:
> Full Workshop
> ? Delegate: AU $400
> ? Full time student: AU $200
>
> One-day registration for Symposium only
> ? Delegate: AU $150
> ? Full time student: AU $75
>
> MAILING LIST
> To express your interest in this workshop and add your name to our mailing list for
> updates, please send an e-mail to Joel Corney (corney_at_physics.uq.edu.au) with the
> words "Subscribe QN.07" as the SUBJECT.
>
Till next week,
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 Feb 14 2007 - 17:50:19 EST
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