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New preprints:
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Paper: cond-mat/0612009
Date: Fri, 1 Dec 2006 00:32:54 GMT (217kb)
Title: Supersolids and Solids to Supersolids transitions in frustrated lattices
Authors: Jinwu Ye
Comments: 6 pages, Revtex, 3 figures. For previous work on bipartite lattices
see cond-mat/0503113
Subj-class: Strongly Correlated Electrons; Materials Science
\\
We studied all the possible phases and phase transitions in an extended boson
Hubbard model slightly away from $ 1/3 $ ($ 2/3 $) filling on frustrated
lattices such as triangular and kagome lattice. We find that in the insulating
side, different kinds of supersolids are generic stable states slightly away
from $ 1/3 $ ($ 2/3 $) filling. We propose a new kind of supersolid: charge
density wave-valence bond supersolid in kagome lattice. We show that the
quantum phase transitions from solids to supersolids driven by a chemical
potential are in the same universality class as that from a Mott insulator to a
superfluid, therefore have exact exponents $ z=2, \nu=1/2, \eta=0 $ (with
logarithmic corrections). Comparisons with previous quantum Monte-Carlo (QMC)
simulations on some microscopic models on triangular and Kagome lattices are
made. Implications on possible future QMC simulations with both nearest
neighbor and next nearest neighbor interactions in both lattices are given. The
results achieved in this paper on frustrated lattices and those achieved in the
previous paper (cond-mat/0503113) on bipartite lattices provide a unified and
simple picture to describe supersolids on any lattices at any filling factors
with any kinds of lattice symmetry breaking patterns. They should have direct
impacts on ultra-cold atoms on optical lattices and may also shed some lights
on microscopic origins and phenomenological theory of possible $ ^{4} He $
supersolid.
\\ ( http://arXiv.org/abs/cond-mat/0612009 , 217kb)
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Paper: cond-mat/0612011
Date: Fri, 1 Dec 2006 02:25:57 GMT (68kb)
Title: Distribution functions of interference contrast in low-dimensional Bose
gases
Authors: Adilet Imambekov, Vladimir Gritsev and Eugene Demler
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
\\
We consider interference experiments with two independent low dimensional
Bose gases. Phase fluctuations result in both the reduced contrast of
interference fringes and shot to shot fluctuations of the interference
contrast. We show that the problem of finding the full distribution function of
fringe contrast can be mapped to the problem of the statistics of random
surfaces. We develop a general method for calculating full distribution
functions for low-dimensional Bose gases, and apply it to one and two
dimensional cases with nonzero temperature. We propose that distribution
functions of interference fringe visibilities can be used for thermometry.
\\ ( http://arXiv.org/abs/cond-mat/0612011 , 68kb)
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Paper: cond-mat/0612030
Date: Fri, 1 Dec 2006 13:09:45 GMT (28kb)
Title: Strongly correlated fermions after a quantum quench
Authors: S.R. Manmana, S. Wessel, R.M. Noack, and A. Muramatsu
Comments: 4 pages, 5 figures, submitted to Phys. Rev. Lett
Subj-class: Other; Strongly Correlated Electrons
\\
Using the adaptive time-dependent density-matrix renormalization group
method, we study the time evolution of strongly correlated spinless fermions on
a one-dimensional lattice after a sudden change of the interaction strength.
For certain parameter values, two different initial states (e.g., metallic and
insulating), lead to observables which become indistinguishable after
relaxation. We find that the resulting quasi-stationary state is non-thermal.
This result holds for both integrable and non-integrable variants of the
system.
\\ ( http://arXiv.org/abs/cond-mat/0612030 , 28kb)
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Paper: cond-mat/0612035
Date: Fri, 1 Dec 2006 18:39:26 GMT (423kb)
Title: Bose-Einstein condensation in the pseudogap phase of cuprate
superconductors
Authors: A. S. Alexandrov
Comments: 16 pages, 4 figures, invited paper at 5th International Conference
STRIPES06 (December 17-22 2006, Rome, Italy)
Subj-class: Superconductivity; Strongly Correlated Electrons
\\
We have identified the unscreened Froehlich electron-phonon interaction (EPI)
as the most essential for pairing in cuprate superconductors as now confirmed
by isotope substitution, recent angle-resolved photoemission (ARPES), and some
other experiments. Low-energy physics is that of mobile lattice polarons and
bipolarons in the strong EPI regime. Many experimental observations have been
predicted or explained in the framework of our "Coulomb-Froehlich" model, which
fully takes into account the long-range Coulomb repulsion and the Froehlich
EPI. They include pseudo-gaps, unusual isotope effects and upper critical
fields, the normal state Nernst effect, diamagnetism, the Hall-Lorenz numbers,
and a giant proximity effect (GPE). These experiments along with the
parameter-free estimates of the Fermi energy and the critical temperature
support a genuine Bose-Einstein condensation of real-space lattice bipolarons
in the pseudogap phase of cuprates. On the contrary the phase fluctuation (or
vortex) scenario is incompatible with the insulating-like in-plane resistivity
and the magnetic-field dependence of orbital magnetization in the resistive
state of underdoped cuprates.
\\ ( http://arXiv.org/abs/cond-mat/0612035 , 423kb)
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Paper (*cross-listing*): nucl-th/0611097
Date: Tue, 28 Nov 2006 09:40:11 GMT (149kb)
Title: Relativistic BCS-BEC crossover in a boson-fermion model
Authors: Jian Deng, Andreas Schmitt, Qun Wang
Comments: ReVTex 4, 13 pages, 7 figures
Subj-class: Nuclear Theory; Superconductivity
\\
We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) pairing to
a Bose-Einstein condensate (BEC) in a relativistic superfluid within a
boson-fermion model. The model includes, besides the fermions, separate bosonic
degrees of freedom, accounting for the bosonic nature of the Cooper pairs. The
crossover is realized by tuning the difference between the boson mass and boson
chemical potential as a free parameter. The model yields populations of
condensed and uncondensed bosons as well as gapped and ungapped fermions
throughout the crossover region for arbitrary temperatures. Moreover, we
observe the appearance of antiparticles for sufficiently large values of the
crossover parameter. The model can potentially be applied to color
superconductivity in dense quark matter at strong couplings.
\\ ( http://arXiv.org/abs/nucl-th/0611097 , 149kb)
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Paper: cond-mat/0612044
Date: Fri, 1 Dec 2006 21:01:08 GMT (35kb)
Title: Mott phases and superfluid-insulator transition of dipolar spin-three
bosons in an optical lattice: implications for Cr atoms
Authors: Jean-Sebastien Bernier, K. Sengupta, Yong Baek Kim
Comments: 10 pages, 12 figures
Subj-class: Strongly Correlated Electrons
\\
We study the Mott phases and superfluid-insulator transition of spin-three
bosons in an optical lattice with an anisotropic two dimensional optical trap.
We chart out the phase diagrams for Mott states with $n=1$ and $n=2$ atoms per
lattice site. It is shown that the long-range dipolar interaction stabilizes a
state where the chains of the ferromagnetically aligned spins run along the
longer trap direction while the spin ordering is staggered between nearby
chains, leading to an antiferromagnetic ordering along the shorter trap
direction. We also obtain the mean-field phase boundary for the
superfluid-insulator transition in these systems and study the nature of spin
ordering in the superfluid state near the transition. We show that, inside the
superfluid phase and near the superfluid-insulator phase boundary, the system
undergoes a first order antiferromagnetic-ferromagnetic spin ordering
transition. We discuss implications of our results for $^{52}$Cr atoms and
suggest possible experiments to detect different phases in such systems.
\\ ( http://arXiv.org/abs/cond-mat/0612044 , 35kb)
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Paper: quant-ph/0612026
Date: Mon, 4 Dec 2006 12:49:34 GMT (170kb)
Title: Cooling in a Bistable Optical Cavity
Authors: Mark Y. Vilensky, Yehiam Prior, and Ilya Sh. Averbukh
\\
We propose a generic approach to nonresonant laser cooling of atoms/molecules
in a bistable optical cavity. The method exemplifies a photonic version of
Sisyphus cooling, in which the matter-dressed cavity extracts energy from the
particles and discharges it to the external field as a result of sudden
transitions between two stable states.
\\ ( http://arXiv.org/abs/quant-ph/0612026 , 170kb)
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Paper: cond-mat/0612099
Date: Mon, 4 Dec 2006 23:25:43 GMT (3kb)
Title: Reply to comment by S.-K. Yip cond-mat/0611426
Authors: Ryan Barnett, Ari Turner, Eugene Demler
Subj-class: Strongly Correlated Electrons
\\
We respond to S.-K. Yip's criticism of our work on the classification of
spinor condensates. We explain why his criticism is unfounded, emphasizing that
the phases he mentions have been addressed in our paper cond-mat/0611230. To
provide a constructive aspect to this response, we use it as an opportunity to
show how our classification scheme makes explicit not only spin rotations which
leave spinor states invariant, but also the phase factors which need to
accompany them.
\\ ( http://arXiv.org/abs/cond-mat/0612099 , 3kb)
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Paper: cond-mat/0612100
Date: Mon, 4 Dec 2006 23:38:50 GMT (94kb)
Title: Quantum emulsion: a glassy phase of bosonic mixtures in optical lattices
Authors: Tommaso Roscilde, J. Ignacio Cirac
Comments: 4 pages, 3 figures
Subj-class: Strongly Correlated Electrons; Disordered Systems and Neural
Networks
\\
We numerically investigate mixtures of two interacting bosonic species with
unequal parameters in one-dimensional optical lattices. In large parameter
regions full phase segregation is seen to minimize the energy of the system,
but the true ground state is masked by an exponentially large number of
metastable states characterized by microscopic phase separation. The ensemble
of these quantum emulsion states, reminiscent of emulsions of immiscible
fluids, has macroscopic properties analogous to those of a Bose glass, namely a
finite compressibility in absence of superfluidity. Their metastability is
probed by extensive quantum Monte Carlo simulations generating a rich
correlated stochastic dynamics. The tuning of the repulsion of one of the two
species via a Feshbach resonance drives the system through a quantum phase
transition to the superfluid state.
\\ ( http://arXiv.org/abs/cond-mat/0612100 , 94kb)
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Paper: cond-mat/0612103
Date: Tue, 5 Dec 2006 05:05:21 GMT (88kb)
Title: Superfluid phase diagrams of trapped Fermi gases with population
imbalance
Authors: Chih-Chun Chien, Qijin Chen, Yan He, and K. Levin
Comments: 4 pages, 4 figures, submitted to PRL
Subj-class: Strongly Correlated Electrons; Superconductivity
\\
We present phase diagrams for population imbalanced, trapped Fermi
superfluids near unitarity. In addition to providing quantitative values for
the superfluid transition temperature, the pairing onset temperature and the
transition line (separating the Sarma and phase separation regimes), we study
experimental signatures of these transitions based on density profiles and
density differences at the center. Predictions on the BCS side of resonance
show unexpected behavior, which should be searched for experimentally.
\\ ( http://arXiv.org/abs/cond-mat/0612103 , 88kb)
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Paper: cond-mat/0612104
Date: Tue, 5 Dec 2006 04:15:13 GMT (694kb)
Title: Multi-component gap solitons in spinor Bose-Einstein condensates
Authors: Beata J. Dabrowska-Wuester, Elena A. Ostrovskaya, Tristram J.
Alexander, Yuri S. Kivshar
Comments: 12 pages, 13 figures
Subj-class: Other
\\
We model the nonlinear behaviour of spin-1 Bose-Einstein condensates (BECs)
with repulsive spin-independent interactions and either ferromagnetic or
anti-ferromagnetic (polar) spin-dependent interactions, loaded into a
one-dimensional optical lattice potential. We show that both types of BECs
exhibit dynamical instabilities and may form spatially localized
multi-component structures. The localized states of the spinor matter waves
take the form of vector gap solitons and self-trapped waves that exist only
within gaps of the linear Bloch-wave band-gap spectrum. Of special interest are
the nonlinear localized states that do not exhibit a common spatial density
profile shared by all condensate components, and consequently cannot be
described by the single mode approximation (SMA), frequently employed within
the framework of the mean-field treatment. We show that the non-SMA states can
exhibits Josephson-like internal oscillations and self-magnetisation, i.e.
intrinsic precession of the local spin. Finally, we demonstrate that
non-stationary states of a spinor BEC in a lattice exhibit coherent undamped
spin-mixing dynamics, and that their controlled conversion into a stationary
state can be achieved by the application of an external magnetic field.
\\ ( http://arXiv.org/abs/cond-mat/0612104 , 694kb)
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Paper: cond-mat/0612114
Date: Tue, 5 Dec 2006 12:37:00 GMT (342kb)
Title: Bogoliubov-Cerenkov radiation in a Bose-Einstein condensate flowing
against an obstacle
Authors: I. Carusotto, S. X. Hu, L. A. Collins, A. Smerzi
Subj-class: Other
\\
We study the density modulation that appears in a Bose-Einstein condensate
flowing with supersonic velocity against an obstacle. The experimental density
profiles observed at JILA are reproduced by a numerical integration of the
Gross-Pitaevskii equation and then interpreted in terms of Cerenkov emission of
Bogoliubov excitations by the defect. The phonon and the single-particle
regions of the Bogoliubov spectrum are respectively responsible for a conical
wavefront and a fan-shaped series of precursors.
\\ ( http://arXiv.org/abs/cond-mat/0612114 , 342kb)
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Paper: cond-mat/0612123
Date: Tue, 5 Dec 2006 17:28:43 GMT (144kb)
Title: Efimov Physics in Cold Atoms
Authors: Eric Braaten (Ohio State U.), H.-W. Hammer (Bonn U.)
Comments: 57 pages, 13 figures, to appear in Annals of Physics
Report-no: HISKP-TH-06-34
Subj-class: Other
\\
Atoms with a large scattering length have universal low-energy properties
that do not depend on the details of their structure or their interactions at
short distances. In the 2-atom sector, the universal properties are familiar
and depend only on the scattering length. In the 3-atom sector for identical
bosons, the universal properties include the existence of a sequence of shallow
triatomic molecules called Efimov trimers and log-periodic dependence of
scattering observables on the energy and the scattering length. In this review,
we summarize the universal results that are currently known. We also summarize
the experimental information that is currently available with an emphasis on
3-atom loss processes.
\\ ( http://arXiv.org/abs/cond-mat/0612123 , 144kb)
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Paper: cond-mat/0612125
Date: Tue, 5 Dec 2006 18:03:25 GMT (58kb)
Title: Few-Body Effects in Cold Atoms and Limit Cycles
Authors: H.-W. Hammer (Bonn U.)
Comments: 7 pages, 3 figures, plenary talk at the 18th International IUPAP
Conference on Few-Body Problems in Physics (FB18), Santos, Brazil, August
2006
Report-no: HISKP-TH-06-33
Subj-class: Other
\\
Physical systems with a large scattering length have universal properties
independent of the details of the interaction at short distances. Such systems
can be realized in experiments with cold atoms close to a Feshbach resonance.
They also occur in many other areas of physics such as nuclear and particle
physics. The universal properties include a geometric spectrum of three-body
bound states (so-called Efimov states) and log-periodic dependence of
low-energy observables on the physical parameters of the system. This behavior
is characteristic of a renormalization group limit cycle. We discuss
universality in the three- and four-body sectors and give an overview of
applications in cold atoms.
\\ ( http://arXiv.org/abs/cond-mat/0612125 , 58kb)
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Paper: quant-ph/0612039
Date: Tue, 5 Dec 2006 20:46:33 GMT (16kb)
Title: Oscillation dynamics of multi-well condensates
Authors: S. Mossmann and C. Jung
Comments: 5 pages, 5 figures
\\
We propose a new approach to the macroscopic dynamics of three-well
Bose-Einstein condensates, giving particular emphasis to self-trapping and
Josephson oscillations. Although these effects have been studied quite
thoroughly in the mean-field approximation, a full quantum description is
desirable, since it avoids pathologies due to the nonlinear character of the
mean-field equations. Using superpositions of quantum eigenstates, we construct
various oscillation and trapping scenarios.
\\ ( http://arXiv.org/abs/quant-ph/0612039 , 16kb)
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Paper: cond-mat/0612132
Date: Wed, 6 Dec 2006 02:04:38 GMT (686kb)
Title: Interaction-induced interference for two independent Bose-Einstein
condensates
Authors: Hongwei Xiong, Shujuan Liu, Mingsheng Zhan
Subj-class: Statistical Mechanics
Journal-ref: New Journal of Physics 8, 245 (2006)
\\
After removing the double-well potential trapping two initially independent
Bose condensates, the density expectation value is calculated when both the
exchange symmetry of identical bosons and interatomic interaction are
considered. The density expectation value and evolution equations are obtained
based on both the first-quantization and second-quantization methods. When the
interatomic interaction is considered carefully, after the overlapping of two
initially independent condensates, it is shown that there is a nonzero
interference term in the density expectation value. It is found that the
calculated density expectation value with this model agrees with the
interference pattern observed in the experiment by Andrews (Science 275, 637
(1997)). The nonzero interference term in the density expectation value
physically arises from the exchange symmetry of identical bosons and
interatomic interaction which make two initially independent condensates become
coherent after the overlapping. For two initially independent condensates, our
researches show that there is an interaction-induced coherence process.
\\ ( http://arXiv.org/abs/cond-mat/0612132 , 686kb)
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Paper: cond-mat/0612133
Date: Wed, 6 Dec 2006 02:36:38 GMT (292kb)
Title: Density-density correlation and interference mechanism for two initially
independent Bose-Einstein condensates
Authors: Shujuan Liu, Hongwei Xiong
Comments: See also cond-mat/0612132 (or New Journal of Physics 8, 245 (2006))
Subj-class: Statistical Mechanics
\\
In an exciting experiment by MIT's group (Science 275, 637 (1997)), clear
interference fringes were observed for two initially independent Bose
condensates in dilute gas. Presently, there are two different theories
(measurement-induced interference theory and interaction-induced interference
theory) which can both explain the MIT's experiment. In this paper, through the
comparison between different theories and discussion about the role of
two-particle correlation, the density-density correlation is suggested to test
different theories in future experiments.
\\ ( http://arXiv.org/abs/cond-mat/0612133 , 292kb)
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Paper: cond-mat/0612137
Date: Wed, 6 Dec 2006 07:31:51 GMT (23kb)
Title: Dynamics of quantum dissipation systems interacting with Fermion and
Boson grand canonical bath ensembles: Path integral versus equations of
motion formalism
Authors: Jinshuang Jin, Sven Welack, JunYan Luo, Xin-Qi Li, Ping Cui, Rui-Xue
Xu, and YiJing Yan
Comments: 12pages
Subj-class: Statistical Mechanics
\\
An exact hierarchical equations of motion formalism for a quantum dissipation
system in a grand canonical bath ensemble surrounding is constructed, on the
basis of the calculus-on-path-integral algorithm, together with the
parametrization of arbitrary non-Markovin bath that satisfies
fluctuation-dissipation theorem. The influence functionals for both the Fermion
or Boson bath interaction are found to be of the same path-integral expression
as the canonical bath, assuming they all satisfy the Gaussian statistics.
However, the equation of motion formalism are different, due to the
fluctuation-dissipation theories that are distinct and used explicitly. The
implications of the present work to quantum transport through molecular wires
and electron transfer in complex molecular systems are discussed.
\\ ( http://arXiv.org/abs/cond-mat/0612137 , 23kb)
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Paper: cond-mat/0612138
Date: Wed, 6 Dec 2006 08:42:47 GMT (20kb)
Title: Class of exactly soluble models of one-dimensional spinless fermions and
its application to the Tomonaga-Luttinger Hamiltonian with nonlinear
dispersion
Authors: A.V. Rozhkov
Comments: 12 pages, 0 figure, revtex 4
Subj-class: Strongly Correlated Electrons
\\
It is shown that for some special values of Hamiltonian parameters the
Tomonaga-Luttinger model with nonlinear dispersion is unitary equivalent to the
system of noninteracting fermions. For such parameter values the
density-density propagator of the Tomonaga-Luttinger Hamiltonian with nonlinear
dispersion can be found exactly. In a generic situation the exact solution can
be used as a reference point around which a perturbative expansion in orders of
certain irrelevant operators may be constructed.
\\ ( http://arXiv.org/abs/cond-mat/0612138 , 20kb)
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Paper: cond-mat/0612148
Date: Wed, 6 Dec 2006 14:09:01 GMT (343kb)
Title: A Mott-like State of Molecules
Authors: S. D\"urr, T. Volz, N. Syassen, D. M. Bauer, E. Hansis, G. Rempe
Comments: Proceedings of the 20th International Conference on Atomic Physics
(ICAP 2006), edited by C. Roos, H. Haffner, and R. Blatt, AIP Conference
Proceedings, Melville, 2006, Vol. 869, pp. 278-283
Subj-class: Statistical Mechanics
DOI: 10.1063/1.2400658
\\
We prepare a quantum state where each site of an optical lattice is occupied
by exactly one molecule. This is the same quantum state as in a Mott insulator
of molecules in the limit of negligible tunneling. Unlike previous Mott
insulators, our system consists of molecules which can collide inelastically.
In the absence of the optical lattice these collisions would lead to fast loss
of the molecules from the sample. To prepare the state, we start from a Mott
insulator of atomic 87Rb with a central region, where each lattice site is
occupied by exactly two atoms. We then associate molecules using a Feshbach
resonance. Remaining atoms can be removed using blast light. Our method does
not rely on the molecule-molecule interaction properties and is therefore
applicable to many systems.
\\ ( http://arXiv.org/abs/cond-mat/0612148 , 343kb)
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Paper: physics/0612052
Date: Tue, 5 Dec 2006 23:59:43 GMT (913kb)
Title: Fractal templates in the escape dynamics of trapped ultracold atoms
Authors: Kevin A. Mitchell, Daniel A. Steck
Comments: 11 pages with 5 figures
Subj-class: Atomic Physics
\\
We consider the dynamic escape of a small packet of ultracold atoms launched
from within an optical dipole trap. Based on a theoretical analysis of the
underlying nonlinear dynamics, we predict that fractal behavior can be seen in
the escape data. This data would be collected by measuring the time-dependent
escape rate for packets launched over a range of angles. This fractal pattern
is particularly well resolved below the Bose-Einstein transition temperature--a
direct result of the extreme phase space localization of the condensate. We
predict that several self-similar layers of this novel fractal should be
measurable and we explain how this fractal pattern can be predicted and
analyzed with recently developed techniques in symbolic dynamics.
\\ ( http://arXiv.org/abs/physics/0612052 , 913kb)
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Paper: cond-mat/0612170
Date: Wed, 6 Dec 2006 21:02:39 GMT (34kb)
Title: Cold atoms in real-space optical lattices
Authors: Ofir E. Alon, Alexej I. Streltsov and Lorenz S. Cederbaum
Comments: 27 pages, 4 figures
Subj-class: Other
\\
Cold atoms in optical lattices are described in {\it real space} by
multi-orbital mean-field Ans\"atze. In this work we consider four typical
systems: (i) spinless identical bosons, (ii) spinor identical bosons (iii),
Bose-Bose mixtures, and (iv) Bose-Fermi mixtures and derive in each case the
corresponding multi-orbital mean-field energy-functional and working equations.
The notions of {\it dressed} Wannier functions and Wannier spinors are
introduced and the equations defining them are presented and discussed. The
dressed Wannier functions are the set of orthogonal, translationally-equivalent
orbitals which minimizes the energy of the Hamiltonian including boson-boson
(particle-particle) interactions. Illustrative examples of dressed Wannier
functions are provided for spinless bosonic atoms and mixtures in
one-dimensional optical lattices.
\\ ( http://arXiv.org/abs/cond-mat/0612170 , 34kb)
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Paper: cond-mat/0612174
Date: Thu, 7 Dec 2006 02:29:18 GMT (331kb)
Title: Phase-locking transition of coupled low-dimensional superfluids
Authors: L. Mathey, A. Polkovnikov, and A.H. Castro Neto
Comments: 5 pages, 3 figures
Subj-class: Other
\\
We study the phase-locking transition of two coupled low-dimensional
superfluids, either two-dimensional superfluids at finite temperature, or
one-dimensional superfluids at zero temperature. We find that the superfluids
have a strong tendency to phase-lock. The phase-locking is accompanied by a
sizeable increase of the transition temperature ($T_{KT}$ in 2D) of the
resulting double-layer superfluid, which suggests a plausible way of observing
the Kibble-Zurek mechanism in two-dimensional cold atom systems by rapidly
varying the tunneling rate between the superfluids. If there is also
interaction between atoms in different layers we find additional phases
characterized by order or quasi long range order either in the symmetric or the
antisymmetric sector.
\\ ( http://arXiv.org/abs/cond-mat/0612174 , 331kb)
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Paper: cond-mat/0612176
Date: Thu, 7 Dec 2006 07:31:03 GMT (7kb)
Title: A heuristic approach to the weakly interacting Bose gas
Authors: Thomas Nattermann
Subj-class: Statistical Mechanics; Disordered Systems and Neural Networks
\\
Some thermodynamic properties of weakly interacting Bose systems are derived
from dimensional and heuristic arguments and thermodynamic relations, without
resorting to statistical mechanics.
\\ ( http://arXiv.org/abs/cond-mat/0612176 , 7kb)
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Paper: cond-mat/0612191
Date: Thu, 7 Dec 2006 15:30:00 GMT (176kb)
Title: Spinor condensates with a laser-induced quadratic Zeeman effect
Authors: L. Santos, M. Fattori, J. Stuhler and T. Pfau
Comments: 4 pages, 2 eps figures
Subj-class: Other
\\
We show that an effective quadratic Zeeman effect can be generated in
$^{52}$Cr by proper laser configurations, and in particular by the dipole trap
itself. The induced quadratic Zeeman effect leads to a rich ground-state phase
diagram, can be used to induce topological defects by controllably quenching
across transitions between phases of different symmetries, allows for the
observability of the Einstein-de Haas effect for relatively large magnetic
fields, and may be employed to create $S=1/2$ systems with spinor dynamics.
Similar ideas could be explored in other atomic species opening an exciting new
control tool in spinor systems.
\\ ( http://arXiv.org/abs/cond-mat/0612191 , 176kb)
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Paper: cond-mat/0612192
Date: Thu, 7 Dec 2006 15:50:48 GMT (59kb)
Title: Correlation functions of the one-dimensional attractive Bose gas
Authors: P. Calabrese and J.-S. Caux
Comments: 4 pages, 2 figures
Subj-class: Statistical Mechanics; Strongly Correlated Electrons
\\
The zero-temperature correlation functions of the one-dimensional attractive
Bose gas with delta-function interaction are calculated analytically for any
value of the interaction parameter and number of particles, directly from the
integrability of the model. We point out a number of interesting features,
including zero recoil energy for large number of particles, analogous to a
M\"ossbauer effect.
\\ ( http://arXiv.org/abs/cond-mat/0612192 , 59kb)
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Paper: quant-ph/0612055
Date: Thu, 7 Dec 2006 12:44:27 GMT (154kb)
Title: An atom-photon pair laser
Authors: Thomas Salzburger, Helmut Ritsch
Comments: 10 pages, 4 figures
\\
We study the quantum dynamics of an ultracold atomic gas in a deep optical
lattice within an optical high-$Q$ resonator. The atoms are coherently
illuminated with the cavity resonance tuned to a blue vibrational sideband, so
that photon scattering to the resonator mode is accompanied by vibrational
cooling of the atoms. This system exhibits a threshold above which pairwise
stimulated generation of a cavity photon and an atom in the lowest vibrational
band dominates spontaneous scattering and we find a combination of optical
lasing with a buildup of a macroscopic population in the lowest lattice band.
Including output coupling of ground-state atoms and replenishing of hot atoms
into the cavity volume leads to a coherent, quantum correlated atom-photon pair
source very analogous to twin light beam generation in a nondegenerate optical
parametric oscillator.
\\ ( http://arXiv.org/abs/quant-ph/0612055 , 154kb)
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Paper: physics/0612071
Date: Thu, 7 Dec 2006 16:09:46 GMT (265kb)
Title: Coherent Control of Ultracold Collisions with Chirped Light: Direction
Matters
Authors: M.J. Wright, J.A. Pechkis, J.L. Carini, S. Kallush, R. Kosloff, and
P.L. Gould
Subj-class: Atomic Physics
\\
We demonstrate the ability to coherently control ultracold atomic Rb
collisions using frequency-chirped light on the nanosecond time scale. For
certain center frequencies of the chirp, the rate of inelastic trap-loss
collisions induced by negatively chirped light is dramatically suppressed
compared to the case of a positive chirp. We attribute this to a fundamental
asymmetry in the system: an excited wavepacket always moves inward on the
attractive molecular potential. For a positive chirp, the resonance condition
moves outward in time, while for a negative chirp, it moves inward, in the same
direction as the excited wavepacket; this allows multiple interactions between
the wavepacket and the light, enabling the wavepacket to be returned coherently
to the ground state. Classical and quantum calculations support this
interpretation.
\\ ( http://arXiv.org/abs/physics/0612071 , 265kb)
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Replacements:
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Paper: cond-mat/0607202
replaced with revised version Fri, 1 Dec 2006 01:43:00 GMT (40kb)
Title: Correlated Fermions on a Checkerboard Lattice
Authors: F. Pollmann, J. J. Betouras, K. Shtengel, P. Fulde
Comments: 4 Pages, 3 Figures; v4: updated version published in Phys. Rev.
Lett.; one reference added
Subj-class: Strongly Correlated Electrons
Journal-ref: Phys. Rev. Lett. 97, 170407 (2006)
DOI: 10.1103/PhysRevLett.97.170407
\\ ( http://arXiv.org/abs/cond-mat/0607202 , 40kb)
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\\
Paper: quant-ph/0606147
replaced with revised version Thu, 30 Nov 2006 22:32:35 GMT (656kb)
Title: Theory for a Hanbury Brown Twiss experiment with a ballistically
expanding cloud of cold atoms
Authors: Jose Viana Gomes (LCFIO), Aur\'{e}lien Perrin (LCFIO), Martijn
Schellekens (LCFIO), Denis Boiron (LCFIO), Christoph I. Westbrook (LCFIO),
Michael Belsley
Proxy: ccsd ccsd-00080649
Subj-class: Quantum Physics; Other
Journal-ref: Physical Review A 74 (07/11/2006) 053607
DOI: 10.1103/PhysRevA.74.053607
\\ ( http://arXiv.org/abs/quant-ph/0606147 , 656kb)
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Paper: cond-mat/0611578
replaced with revised version Fri, 1 Dec 2006 08:33:44 GMT (66kb)
Title: Trapped Resonant Fermions above Superfluid Transition Temperature
Authors: Chi-Ho Cheng and Sung-Kit Yip
Comments: 9 pages, 4 figures
Subj-class: Superconductivity; Other; Atomic Physics
\\ ( http://arXiv.org/abs/cond-mat/0611578 , 66kb)
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\\
Paper: cond-mat/0611620
replaced with revised version Sun, 3 Dec 2006 21:27:01 GMT (143kb)
Title: Bond algebraic liquid phase in strongly correlated multiflavor cold atom
systems
Authors: Cenke Xu and Matthew P. A. Fisher
Comments: 15 pages, 10 figures
Subj-class: Strongly Correlated Electrons; Soft Condensed Matter
\\ ( http://arXiv.org/abs/cond-mat/0611620 , 143kb)
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Paper (*cross-listing*): math-ph/0610075
replaced with revised version Sat, 2 Dec 2006 22:09:36 GMT (10kb)
Title: Hanbury-Brown and Twiss Intensity Correlations of Parabosons
Authors: Charles A. Nelson and Paresh R. Shimpi
Comments: 16 pages; version 4 to add simple p-independent recursion relation
Report-no: SUNY BING 10/1/6
Subj-class: Mathematical Physics
\\ ( http://arXiv.org/abs/math-ph/0610075 , 10kb)
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Paper: cond-mat/0604183
replaced with revised version Tue, 5 Dec 2006 15:43:32 GMT (26kb)
Title: Collisional relaxation of Feshbach molecules and three-body
recombination in 87Rb Bose-Einstein condensates
Authors: G. Smirne, R. M. Godun, D. Cassettari, V. Boyer, C. J. Foot, T. Volz,
N. Syassen, S. D\"urr, G. Rempe, M. D. Lee, K. Goral, T. Koehler
Comments: 4 pages, 3 eps figures (updated references)
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0604183 , 26kb)
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Paper: quant-ph/0609111
replaced with revised version Mon, 4 Dec 2006 21:11:20 GMT (761kb)
Title: Quantum logic via the exchange blockade in ultracold collisions
Authors: David Hayes, Paul Julienne, Ivan Deutsch
\\ ( http://arXiv.org/abs/quant-ph/0609111 , 761kb)
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Paper: cond-mat/0510290
replaced with revised version Wed, 6 Dec 2006 16:55:31 GMT (22kb)
Title: Biaxial spin-nematic phase of two dimensional disordered rotor models
and spin-one bosons in optical lattices
Authors: Jean-Sebastien Bernier, K. Sengupta, Yong Baek Kim
Comments: revtex file 7 pages, 2 figures, version published in PRB
Subj-class: Strongly Correlated Electrons; Statistical Mechanics
Journal-ref: Phys. Rev. B 74, 155124 (2006)
\\ ( http://arXiv.org/abs/cond-mat/0510290 , 22kb)
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Paper: cond-mat/0604423
replaced with revised version Wed, 6 Dec 2006 03:15:14 GMT (39kb)
Title: Breakdown of the local density approximation in interacting systems of
cold fermions in strongly anisotropic traps
Authors: Adilet Imambekov, C. J. Bolech, Mikhail Lukin, and Eugene Demler
Comments: Final published version
Subj-class: Strongly Correlated Electrons
Journal-ref: Phys. Rev. A 74, 053626 (2006)
DOI: 10.1103/PhysRevA.74.053626
\\ ( http://arXiv.org/abs/cond-mat/0604423 , 39kb)
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Paper: cond-mat/0607834
replaced with revised version Wed, 6 Dec 2006 15:39:46 GMT (220kb)
Title: Polarized fermions in the unitarity limit
Authors: Gautam Rupak, Thomas Schaefer, Andrei Kryjevski
Comments: 5 pages, 5 figures, LaTeX2e; minor changes, note added at the end, to
be published in PRA
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0607834 , 220kb)
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Paper: quant-ph/0509072
replaced with revised version Wed, 6 Dec 2006 03:39:52 GMT (6kb)
Title: Note on the Zero-Energy-Limit Solution for the Modified Gross-Pitaevskii
Equation
Authors: A. Kwang-Hua Chu
Comments: 4 pages in total; 2002-May completed
\\ ( http://arXiv.org/abs/quant-ph/0509072 , 6kb)
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Paper: cond-mat/0609725
replaced with revised version Thu, 7 Dec 2006 09:35:53 GMT (276kb)
Title: Association of molecules using a resonantly modulated magnetic field
Authors: Thomas M. Hanna, Thorsten Koehler, and Keith Burnett
Comments: 8 pages latex, figures revised, references updated and typos
corrected
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0609725 , 276kb)
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Paper: cond-mat/0610610
replaced with revised version Thu, 7 Dec 2006 13:55:21 GMT (301kb)
Title: Phase Diagram of Asymmetric Fermion Superfluid Including Single-Species
Pairing
Authors: Xuguang Huang, Xuewen Hao and Pengfei Zhuang
Comments: 4 pages, 4 figures
Subj-class: Superconductivity
\\ ( http://arXiv.org/abs/cond-mat/0610610 , 301kb)
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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 Mon Dec 11 2006 - 15:05:16 EST
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