[Matts-arxiv] Matt's arXiv selection: week ending 13 August 2010

From: Matthew Davis <mdavis_at_physics.uq.edu.au>
Date: Tue, 19 Oct 2010 22:55:08 +1000

Dear subscribers,

This week's selection was compiled by an anonymous correspondent, and contains
57 new abstracts and 32 replacements.

arXiv:1008.1539 (*cross-listing*)
Date: Tue, 3 Aug 2010 17:54:25 GMT (117kb,D)

Title: Periodic Solutions and Rogue Wave Type Extended Compactons in the
   Nonlinear Schrodinger Equation
Authors: Patrick Johnson, Daniel Cole, Zohar Nussinov
Categories: math-ph cond-mat.other math.MP
   By employing a mapping to classical anharmonic oscillators, we explore a
class of solutions to the Nonlinear Schrodinger Equation (NLSE) in 1+1
dimensions and, by extension, asymptotically in general dimensions. We discuss
a possible way for creating approximate rogue wave like olutions to the NLSE by
truncating exact solutions at their nodes and stitching them with other
solutions to the NLSE. The resulting waves are similar to compactons with the
notable difference that they are not localized but rather extend over all of
\\ ( http://arxiv.org/abs/1008.1539 , 117kb)
Date: Thu, 5 Aug 2010 20:02:58 GMT (51kb)

Title: Weak Mott Insulators
Authors: Hong Yao and Steven A. Kivelson
Categories: cond-mat.str-el cond-mat.supr-con
Comments: 4 pages, 2 figures
   We prove that there exists a class of crystalline insulators, which we call
"weak Mott insulators", which are not adiabatically connected to any sort of
band insulator provided time-reversal and certain point-group symmetries are
respected, but which are otherwise unspectacular in that they exhibit no
topological order nor any form of exotic quasi-particles. We illustrate this
new type of insulators with two examples: the d-Mott insulator discovered in
the checkerboard Hubbard model at half-filling and the AKLT insulator on the
square lattice.
\\ ( http://arxiv.org/abs/1008.1065 , 51kb)
Date: Thu, 5 Aug 2010 21:56:14 GMT (37kb)

Title: Quantum phase transitions in coupled two-level atoms in a single-mode
Authors: Qing-Hu Chen, Tao Liu, Yu-Yu Zhang, and Ke-Lin Wang
Categories: quant-ph
Comments: 13 pages, 5 figures
   The dipole-coupled two-level atoms(qubits) in a single-mode resonant cavity
is studied by extended bosonic coherent states. The numerically exact solution
is presented. For finite systems, the first-order quantum phase transitions
occur at the strong interatomic interaction. Similar to the original Dicke
model, this system exhibits a second-order quantum phase transition from the
normal to the superradiant phases. Finite-size scaling for several observables,
such as the average fidelity susceptibility, the order parameter, and
concurrence are performed for different interatomic interactions. The obtained
scaling exponents suggest that interatomic interactions do not change the
universality class.
\\ ( http://arxiv.org/abs/1008.1093 , 37kb)
Date: Fri, 6 Aug 2010 02:08:19 GMT (54kb)

Title: Influence of superohmic dissipation on a disordered quantum critical
Authors: Thomas Vojta, J. A. Hoyos, Priyanka Mohan, and Rajesh Narayanan
Categories: cond-mat.str-el
Comments: 11 pages, 2 eps figures included, submitted to the "Strongly
   Correlated Electron Systems" special issue of Journal of Physics: Condensed
   We investigate the combined influence of quenched randomness and dissipation
on a quantum critical point with O(N) order-parameter symmetry. Utilizing a
strong-disorder renormalization group, we determine the critical behavior in
one space dimension exactly. For superohmic dissipation, we find a
Kosterlitz-Thouless type transition with conventional (power-law) dynamical
scaling. The dynamical critical exponent depends on the spectral density of the
dissipative baths. We also discuss the Griffiths singularities, and we
determine observables.
\\ ( http://arxiv.org/abs/1008.1106 , 54kb)
Date: Fri, 6 Aug 2010 06:35:49 GMT (1867kb)

Title: An AC Stark Gradient Echo Memory in Cold Atoms
Authors: B. M. Sparkes, M. Hosseini, G. H\'etet, P. K. Lam, and B. C. Buchler
Categories: quant-ph physics.atom-ph
   The burgeoning fields of quantum computing and quantum key distribution have
created a demand for a quantum memory. The gradient echo memory scheme is a
quantum memory candidate for light storage that can boast efficiencies
approaching unity, as well as the flexibility to work with either two or three
level atoms. The key to this scheme is the frequency gradient that is placed
across the memory. Currently the three level implementation uses a Zeeman
gradient and warm atoms. In this paper we model a new gradient creation
mechanism - the ac Stark effect - to provide an improvement in the flexibility
of gradient creation and field switching times. We propose this scheme in
concert with a move to cold atoms (~1 mK). These temperatures would increase
the storage times possible, and the small ensemble volumes would enable large
ac Stark shifts with reasonable laser power. We find that memory bandwidths on
the order of MHz can be produced with experimentally achievable laser powers
and trapping volumes, with high precision in gradient creation and switching
times on the order of nanoseconds possible. By looking at the different
decoherence mechanisms present in this system we determine that coherence times
on the order of 10s of milliseconds are possible, as are delay-bandwidth
products of approximately 50 and efficiencies over 90%.
\\ ( http://arxiv.org/abs/1008.1122 , 1867kb)
Date: Fri, 6 Aug 2010 07:49:57 GMT (189kb)

Title: The permanent dipole moment of LiCs in the ground state
Authors: J. Deiglmayr, A. Grochola, M. Repp, O. Dulieu, R. Wester, M.
Categories: physics.atom-ph
Comments: 4 pages, 2 figures
   Recently we demonstrated the formation of ultracold polar LiCs molecules in
deeply bound levels of the X1S+ ground state, including the rovibrational
ground state [J. Deiglmayr et al., Phys. Rev. Lett. 101, 133004 (2008)]. Here
we report on the first experimental determination of the permanent electric
dipole moment of deeply bound LiCs molecules. For X1S+,v"=2 and v"=3 we measure
values of mu=5.5(2) Debye and 5.3(2) Debye respectively.
\\ ( http://arxiv.org/abs/1008.1129 , 189kb)
Date: Fri, 6 Aug 2010 09:14:48 GMT (1956kb,D)

Title: Feshbach resonances in 3He*-4He* mixtures
Authors: M.R. Goosen, T.G. Tiecke, W. Vassen, S.J.J.M.F. Kokkelmans
Categories: cond-mat.quant-gas
Comments: 12 pages, 7 figures
   We discuss the stability of homonuclear and heteronuclear mixtures of 3He and
4He atoms in the metastable 2^3S_1 state (He*) and predict positions and widths
of Feshbach resonances by using the Asymptotic Bound-state Model (ABM). All
calculations are performed without fit parameters, using \emph{ab-initio}
calculations of molecular potentials. One promising very broad Feshbach
resonance (\Delta B=72.9^{+18.3}_{-19.3} mT) is found that allows for tuning of
the inter-isotope scattering length.
\\ ( http://arxiv.org/abs/1008.1141 , 1956kb)
Date: Fri, 6 Aug 2010 11:50:33 GMT (91kb)

Title: Density Functional of a Two-Dimensional Gas of Dipolar Atoms:
   Thomas-Fermi-Dirac Treatment
Authors: Bess Fang and Berthold-Georg Englert
Categories: cond-mat.quant-gas
Comments: 11 pages, 4 figures, 1 table
   We derive the density functional for the ground-state energy of a
two-dimensional, spin-polarized gas of neutral fermionic atoms with
magnetic-dipole interaction, in the Thomas-Fermi-Dirac approximation. For many
atoms in a harmonic trap, we give analytical solutions for the single-particle
spatial density and the ground-state energy, in dependence on the interaction
strength. We also discuss the weak-interaction limit that is relevant for
\\ ( http://arxiv.org/abs/1008.1163 , 91kb)
Date: Fri, 6 Aug 2010 12:49:19 GMT (129kb)

Title: Phase separation transition in anti-ferromagnetically interacting
   particle systems
Authors: Anasuya Kundu, P. K. Mohanty
Categories: cond-mat.stat-mech
Comments: 4 pages, 5 figures
   One dimensional non-equilibrium systems with short-range interaction can
undergo phase transitions from homogeneous states to phase separated states as
interaction ($\epsilon$) among particles is increased. One of the model systems
where such transition has been observed is the extended Katz-Lebowitz-Spohn
(KLS) model with ferro-magnetically interacting particles at $\epsilon=4/5$.
Here, the system remains homogeneous for small interaction strength
($\epsilon<4/5$), and for anti-feromagnetic interactions ($\epsilon<0$). We
show that the phase separation transitions can also occur in anti-ferromagnetic
systems if interaction among particles depends explicitly on the size of the
block ($n$) they belong to. We study this transition in detail for a specific
case $\epsilon = \delta/n$, where phase separation occurs for $\delta < -1$.
\\ ( http://arxiv.org/abs/1008.1174 , 129kb)
Date: Fri, 6 Aug 2010 13:31:17 GMT (18kb)

Title: Thermodynamics of rotating Bose gases in a trap
Authors: Jinghan Fan, Qiang Gu, Wei Guo
Categories: cond-mat.quant-gas cond-mat.supr-con
Comments: 4 pages, 1 figure
   Novel ground state properties of rotating Bose gases have been intensively
studied in the context of neutral cold atoms. We investigate the rotating Bose
gas in a trap from a thermodynamic perspective, taking the charged ideal Bose
gas in magnetic field (which is equivalent to a neutral gas in a synthetic
magnetic field) as an example. It is indicated that the Bose-Einstein
condensation temperature is irrelevant to the magnetic field, conflicting with
established intuition that the critical temperature decreases with the field
increasing. The specific heat and Landau diamagnetization also exhibit
intriguing behaviors. In contrast, we demonstrate that the condensation
temperature for neutral Bose gases in a rotating frame drops to zero in the
fast rotation limit, signaling a non-condensed quantum phase in the ground
\\ ( http://arxiv.org/abs/1008.1192 , 18kb)
Date: Fri, 6 Aug 2010 13:33:52 GMT (107kb)

Title: Fractional vortices and a Bean-Livingston barrier in two-component
Authors: M.A. Silaev
Categories: cond-mat.supr-con
   In the framework of London theory we show that fractional vortices in
two-component superconductors can be stabilized near the surface. Consequently
the process of vortex entry into the superconductor consists of several steps,
while the external magnetic field increases from zero. At the first stage only
vortices in one of the order parameter components penetrate and sit at the
equilibrium position near the surface. When the magnetic field is increased
further vortices in the second order parameter component eventually enter the
superconductor. Such a complex partial vortex penetration leads to the
modification of a Bean-Livingston barrier and a magnetization curve as compared
to conventional single-component superconductors.
\\ ( http://arxiv.org/abs/1008.1194 , 107kb)
Date: Fri, 6 Aug 2010 13:43:45 GMT (124kb)

Title: Effect of time delay on the onset of synchronization of the stochastic
   Kuramoto model
Authors: Monoj Kumar Sen, Bidhan Chandra Bag, Karen G. Petrosyan and Chin-Kun
Categories: cond-mat.stat-mech nlin.CD
Comments: 19 pages with 7 figures
Journal-ref: Journal of Statistical Mechanics-Theory and Experiment (2010)
   We consider the Kuramoto model of globally coupled phase oscillators with
time-delayed interactions, that is subject to the Ornstein-Uhlenbeck (Gaussian)
colored or the non-Gaussian colored noise. We investigate numerically the
interplay between the influences of the finite correlation time of noise $\tau$
and the time delay $\tau_{d}$ on the onset of the synchronization process. Both
cases for identical and nonidentical oscillators had been considered. Among the
obtained results for identical oscillators is a large increase of the
synchronization threshold as a function of time delay for the colored
non-Gaussian noise compared to the case of the colored Gaussian noise at low
noise correlation time $\tau$. However, the difference reduces remarkably for
large noise correlation times. For the case of nonidentical oscillators, the
incoherent state may become unstable around the maximum value of the threshold
(as a function of time delay) even at lower coupling strength values in the
presence of colored noise as compared to the noiseless case. We had studied the
dependence of the critical value of the coupling strength (the threshold of
synchronization) on given parameters of the stochastic Kuramoto model in great
details and presented results for possible cases of colored Gaussian and
non-Gaussian noises.
\\ ( http://arxiv.org/abs/1008.1198 , 124kb)
arXiv:1008.1208 (*cross-listing*)
Date: Fri, 6 Aug 2010 14:33:35 GMT (79kb,D)

Title: A numerical projection technique for large-scale eigenvalue problems
Authors: Ralf Gamillscheg, Gundolf Haase, Wolfgang von der Linden
Categories: cond-mat.str-el physics.comp-ph
Comments: 7 pages, 4 figures
   We present a new numerical technique to solve large-scale eigenvalue
problems. It is based on the projection technique, used in strongly correlated
quantum many-body systems, where first an effective approximate model of
smaller complexity is constructed by projecting out high energy degrees of
freedom and in turn solving the resulting model by some standard eigenvalue
   Here we introduce a generalization of this idea, where both steps are
performed numerically and which in contrast to the standard projection
technique converges in principle to the exact eigenvalues. This approach is not
just applicable to eigenvalue problems encountered in many-body systems but
also in other areas of research that result in large scale eigenvalue problems
for matrices which have, roughly speaking, mostly a pronounced dominant
diagonal part. We will present detailed studies of the approach guided by two
many-body models.
\\ ( http://arxiv.org/abs/1008.1208 , 79kb)
Date: Fri, 6 Aug 2010 18:42:29 GMT (342kb)

Title: Measuring forces by BEC Interferometry on a Chip
Authors: Florian Baumgartner, R. J. Sewell, Stefan Eriksson, Isabel
   Llorente-Garcia, Jos Dingjan, J. P. Cotter and E. A. Hinds
Categories: cond-mat.quant-gas cond-mat.other
Comments: 4 pages, 4 figures
   We investigate the use of a Bose-Einstein condensate trapped on an atom chip
for making interferometric measurements of small forces. A fundamental limit on
sensitivity is imposed by the noise in the energy difference of the split
condensates, which we measure and explain. We also consider systematic errors.
A leading effect is the variation of rf magnetic field in the trap with
distance from the wires on the chip surface. This can produce energy
differences that are comparable with those due to gravity. We use our
interferometer to weigh the (^{87})Rb atom as a proof that BEC atom chips can
be used to measure small forces.
\\ ( http://arxiv.org/abs/1008.1252 , 342kb)
Date: Fri, 6 Aug 2010 19:09:51 GMT (133kb)

Title: Single-photon cooling in a wedge billiard
Authors: S. Choi, B. Sundaram, M. G. Raizen
Categories: physics.atom-ph
Comments: Submitted for Publication. 9 pages, 6 figures
   Single-Photon Cooling (SPC), noted for its potential as a versatile method
for cooling a variety of atomic species, has recently been demonstrated
experimentally. In this paper, we study possible ways to improve the
performance of SPC by applying it to atoms trapped inside a wedge billiard. The
main feature of wedge billiard for atoms, also experimentally realized
recently, is that the nature of atomic trajectories within it changes from
stable periodic orbit to random chaotic motion with the change in wedge angle.
We find that a high cooling efficiency is possible in this system with a
relatively weak dependence on the wedge angle, and that chaotic dynamics,
rather than regular orbit, is more desirable for enhancing the performance of
\\ ( http://arxiv.org/abs/1008.1255 , 133kb)
Date: Fri, 6 Aug 2010 19:34:21 GMT (569kb)

Title: Detecting many-body entanglements in noninteracting ultracold atomic
   fermi gases
Authors: G. C. Levine, B. A. Friedman and M. J. Bantegui
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 5 pages, 5 figures
   We explore the possibility of detecting many-body entanglement using
time-of-flight (TOF) momentum correlations in ultracold atomic fermi gases. In
analogy to the vacuum correlations responsible for Bekenstein-Hawking black
hole entropy, a partitioned atomic gas will exhibit particle-hole correlations
responsible for entanglement entropy. The signature of these momentum
correlations might be detected by a sensitive TOF type experiment.
\\ ( http://arxiv.org/abs/1008.1258 , 569kb)
Date: Fri, 6 Aug 2010 20:14:10 GMT (143kb)

Title: Approximate solution of variational wavefunctions for strongly
   correlated systems: description of a correlated insulator
Authors: Balazs Hetenyi
Categories: cond-mat.str-el
Comments: 12 pages, 7 figures, to appear in Phys. Rev. B
   An approximate solution scheme, similar to the Gutzwiller approximation, is
presented for the Baeriswyl and the Baeriswyl-Gutzwiller variational
wavefunctions. The phase diagram of the one-dimensional Hubbard model as a
function of interaction strength and particle density is determined. For the
Baeriswyl wavefunction a metal-insulator transition is found at half-filling,
where the metallic phase ($U<U_c$) corresponds to the Hartree-Fock solution,
the insulating phase is one with finite double occupations arising from bound
excitons. This transition can be viewed as the "inverse" of the Brinkman-Rice
transition. Close to but away from half filling, the $U>U_c$ phase displays a
finite Fermi step, as well as double occupations originating from bound
excitons. As the filling is changed away from half-filling bound excitons are
supressed. For the Baeriswyl-Gutzwiller wavefunction at half-filling a
metal-insulator transition between the correlated metallic and excitonic
insulating state is found. Away from half-filling bound excitons are suppressed
quicker than for the Baeriswyl wavefunction.
\\ ( http://arxiv.org/abs/1008.1272 , 143kb)
Date: Fri, 6 Aug 2010 22:02:53 GMT (57kb)

Title: Non-equilibrium dynamics of the Bose-Hubbard model
Authors: C. Trefzger and K. Sengupta
Categories: cond-mat.other
Comments: 4 pages, 4 figures
   We study the phase diagram and the non-equilibrium dynamics, both subsequent
to a sudden quench of the hopping amplitude $J$ and during a ramp
$J(t)=Jt/\tau$ with ramp time $\tau$, of the Bose-Hubbard model, using a
projection operator formalism which allows us to incorporate the effects of
quantum fluctuations beyond mean-field approximation in the strong coupling
regime. Our formalism yields a phase diagram which provides a near exact match
with quantum Monte Carlo results in three dimensions. We also use this
formalism to compute the wavefunction overlap $F$, the residual energy $Q$, the
superfluid order parameter $\Delta(t)$, the equal-time order parameter
correlation function $C(t)$ and the defect density $P$ during non-equilibrium
dynamics of the model. We find that $Q$, $F$ and $P$ do not exhibit the
expected universal scaling. We explain this absence of universality and show
that our results compare well with the recent experimental observations.
\\ ( http://arxiv.org/abs/1008.1285 , 57kb)
Date: Sat, 7 Aug 2010 05:44:49 GMT (2kb)

Title: Noninteracting Fermions in infinite dimensions
Authors: Muktish Acharyya (Dept. of Physics, Presidency College, Calcutta,
Categories: cond-mat.stat-mech
Comments: Submitted to European Journal of Physics
Report-no: PC-07082010
   In general, we study the statistical behaviours on noninteracting Fermi gas
in finite (mainly two and three) dimensions. For a fixed number of fermions,
the average energy per fermion is calculated in three dimensions and it becomes
equal to 60 of the fermi energy. However, in the higher dimensions this
percentage increases and in infinite dimensions it becomes 100 per cent. This
is an intersting result, at least pedagogically. Which implies all fermions are
moving with Fermi momentum. This result is not discussed in standard text books
of quantum statistics. In this paper, this fact is discussed and explained.
\\ ( http://arxiv.org/abs/1008.1306 , 2kb)
arXiv:1008.1366 (*cross-listing*)
Date: Sat, 7 Aug 2010 21:36:51 GMT (443kb)

Title: Efficient Dealiased Convolutions without Padding
Authors: John C. Bowman and Malcolm Roberts
Categories: cs.CE physics.comp-ph
Comments: 18 pages, 9 figures
MSC-class: 65R99, 65T50
   Algorithms are developed for calculating dealiased linear convolution sums
without the expense of conventional zero-padding or phase-shift techniques. For
one-dimensional in-place convolutions, the memory requirements are identical
with the zero-padding technique, with the important distinction that the
additional work memory need not be contiguous with the input data. This
decoupling of data and work arrays dramatically reduces the memory and
computation time required to evaluate higher-dimensional in-place convolutions.
The technique also allows one to dealias the higher-order convolutions that
arise from Fourier transforming cubic and higher powers. Implicitly dealiased
convolutions can be built on top of state-of-the-art fast Fourier transform
libraries: vectorized multidimensional implementations for the complex and
centered Hermitian (pseudospectral) cases have been implemented in the
open-source software FFTW++.
\\ ( http://arxiv.org/abs/1008.1366 , 443kb)
Date: Sun, 8 Aug 2010 04:14:50 GMT (27kb)

Title: Wheels within wheels: Hamiltonian dynamics as a hierarchy of action
Authors: Rory J. Perkins and Paul M. Bellan
Categories: physics.class-ph
Comments: 7 pages, 3 figures
   In systems where one coordinate undergoes periodic oscillation, the net
displacement in any other coordinate over a single period is shown to be given
by differentiation of the action integral associated with the oscillating
coordinate. This result is then used to demonstrate that the action integral
acts as a Hamiltonian for slow coordinates providing time is scaled to the
``tick-time'' of the oscillating coordinate. Numerous examples, including
charged particle drifts and relativistic motion, are supplied to illustrate the
varied application of these results.
\\ ( http://arxiv.org/abs/1008.1379 , 27kb)
arXiv:1008.1415 (*cross-listing*)
Date: Sun, 8 Aug 2010 18:05:52 GMT (17kb)

Title: On highly accurate calculations of the excited $n^1S(L = 0)-$states in
   helium atoms
Authors: Alexei M. Frolov and David M. Wardlaw
Categories: physics.atom-ph quant-ph
   The total energies and various bound state properties of the excited $2^1S(L
= 0)-$states in two-electron helium atoms, including the ${}^{\infty}$He,
${}^4$He and ${}^3$He atoms, are determined to very high numerical accuracy.
The convergence of the results obtained for some electron-nuclear and
electron-electron expectation values and, in particular, for the
electron-nuclear and electron-electron cusp values, is discussed. The field
component of the isotope shift and lowest order QED correction are estimated
for the $2^1S(L = 0)-$states in the ${}^4$He and ${}^3$He atoms. We also apply
our highly accurate methods to numerical computations of the excited
$n^1S-$states (for $n$ = 3 and 4) in two-electron atomic systems.
\\ ( http://arxiv.org/abs/1008.1415 , 17kb)
arXiv:1008.1416 (*cross-listing*)
Date: Sun, 8 Aug 2010 18:12:33 GMT (1120kb)

Title: Cooling of mechanical motion with a two level system: the high
   temperature regime
Authors: P. Rabl
Categories: cond-mat.mes-hall quant-ph
   We analyze cooling of a nano-mechanical resonator coupled to a dissipative
solid state two level system focusing on the regime of high initial
temperatures. We derive an effective Fokker-Planck equation for the mechanical
mode which accounts for saturation and other non-linear effects and allows us
to study the cooling dynamics of the resonator mode for arbitrary occupation
numbers. We find a degrading of the cooling rates and eventually a breakdown of
cooling at very high initial temperatures and discuss the dependence of these
effects on various system parameters. Our results apply to most solid state
systems which have been proposed for cooling a mechanical resonator including
quantum dots, superconducting qubits and electronic spin qubits.
\\ ( http://arxiv.org/abs/1008.1416 , 1120kb)
arXiv:1008.1452 (*cross-listing*)
Date: Mon, 9 Aug 2010 04:46:17 GMT (714kb)

Title: A Green Laser Pointer Hazard
Authors: Jemellie Galang, Allesandro Restelli, Edward W. Hagley, Charles W.
Categories: physics.optics cond-mat.quant-gas quant-ph
Comments: Document available from the U.S. National Institute of Standards and
   Technology at
Report-no: NIST Technical Note 1668
   An inexpensive green laser pointer was found to emit 20 mW of infrared
radiation during normal use. This is potentially a serious hazard that would
not be noticed by most users of such pointers. We find that this infrared
emission derives from the design of the pointer, and describe a simple method
of testing for infrared emissions using common household items.
\\ ( http://arxiv.org/abs/1008.1452 , 714kb)
Date: Mon, 9 Aug 2010 06:41:03 GMT (214kb)

Title: Virial expansion for a strongly correlated Fermi gas with imbalanced
   spin populations
Authors: Xia-Ji Liu and Hui Hu
Categories: cond-mat.quant-gas
Comments: 6 pages, 4 figures
   Quantum virial expansion provides an ideal tool to investigate the
high-temperature properties of a strongly correlated Fermi gas. Here, we
construct the virial expansion in the presence of spin population imbalance. Up
to the third order, we calculate the high-temperature free energy of a unitary
Fermi gas as a function of spin imbalance, with infinitely large, attractive or
repulsive interactions. In the latter repulsive case, we show that there is no
itinerant ferromagnetism when quantum virial expansion is applicable. We
therefore estimate an upper bound for the ferromagnetic transition temperature
$T_{c}$. For a harmonically trapped Fermi gas at unitarity, we find that
$(T_{c})_{uppper}<T_{F}$, where $T_{F}$ is the Fermi temperature at the center
of the trap. Our result for the high-temperature equations of state may
confront future high-precision thermodynamic measurements.
\\ ( http://arxiv.org/abs/1008.1457 , 214kb)
Date: Mon, 9 Aug 2010 15:11:23 GMT (303kb,D)

Title: Transport properties of a spin-1/2 Heisenberg chain with an embedded
   spin-S impurity
Authors: A. Metavitsiadis
Categories: cond-mat.str-el
Comments: 5 pages, 4 figures
   The finite temperature transport properties of a spin-1/2 anisotropic
Heisenberg chain with an embedded spin-S impurity are studied. Using primarily
numerical diagonalization techniques, we study the dependence of the dynamical
spin and thermal conductivities on the lattice size, the magnitude of the
impurity spin, the host-impurity coupling, the easy axis anisotropy, as well as
the dependence on temperature. Particularly for the temperature dependence, we
discuss the screening of the impurity by the chain leading eventually to the
cutting or the healing of the host chain. Numerical results are supported by
analytical arguments obtained in the strong host-impurity coupling regime.
\\ ( http://arxiv.org/abs/1008.1524 , 303kb)
Date: Mon, 9 Aug 2010 17:09:56 GMT (11kb)

Title: Emergence of coherence in the Mott--superfluid quench of the
   Bose-Hubbard model
Authors: Patrick Navez and Ralf Sch\"utzhold
Categories: quant-ph cond-mat.quant-gas
Comments: 4 pages
   We study the quench from the Mott to the superfluid phase in the Bose-Hubbard
model and investigate the spatial-temporal growth of phase coherence, i.e.,
phase locking between initially uncorrelated sites. To this end, we establish a
hierarchy of correlations via a controlled expansion into inverse powers of the
coordination number $1/Z$. It turns out that the off-diagonal long-range order
spreads with a constant propagation speed, forming local condensate patches,
whereas the phase correlator follows a diffusion-like growth rate.
\\ ( http://arxiv.org/abs/1008.1548 , 11kb)
Date: Mon, 9 Aug 2010 17:23:31 GMT (712kb,D)

Title: Nonlinear interferometry with Bose-Einstein condensates
Authors: Alexandre B. Tacla, Sergio Boixo, Animesh Datta, Anil Shaji and
   Carlton M. Caves
Categories: quant-ph cond-mat.quant-gas
Comments: 16 pages, 7 figures
   We analyze a proposed experiment [S. Boixo et al., Phys. Rev. Lett. 101,
040403 (2008)] for achieving sensitivity scaling better than $1/N$ in a
nonlinear Ramsey interferometer that uses a two-mode Bose-Einstein condensate
(BEC) of $N$ atoms. We present numerical simulations that confirm the
analytical predictions for the effect of the spreading of the BEC ground-state
wave function on the ideal $1/N^{3/2}$ scaling. Numerical integration of the
coupled, time-dependent, two-mode Gross-Pitaevskii equations allows us to study
the several simplifying assumptions made in the initial analytic study of the
proposal and to explore when they can be justified. In particular, we find that
the two modes share the same spatial wave function for a length of time that is
sufficient to run the metrology scheme.
\\ ( http://arxiv.org/abs/1008.1551 , 712kb)
Date: Mon, 9 Aug 2010 18:15:01 GMT (73kb)

Title: Scattering theory and the Aharonov--Bohm effect in quasiclassical
Authors: Yurii A. Sitenko and Nadiia D. Vlasii
Categories: quant-ph cond-mat.str-el hep-th math-ph math.MP
Comments: 25 pages, 3 figures
   Scattering of a nonrelativistic quantum-mechanical particle by an
impenetrable magnetic vortex is considered. The nonvanishing transverse size of
the vortex is taken into account, and the limit of short, as compared to this
size, wavelengths of the scattered particle is analyzed. We show that the
scattering Aharonov-Bohm effect persists in the quasiclassical limit owing to
the diffraction persisting in the short-wavelength limit. As a result, the
vortex flux serves as a gate for the propagation of short-wavelength, almost
classical, particles. This quasiclassical effect is more feasible to
experimental detection in the case when space outside the vortex is conical.
\\ ( http://arxiv.org/abs/1008.1562 , 73kb)
Date: Mon, 9 Aug 2010 20:13:59 GMT (293kb,D)

Title: Quantized pumping and phase diagram topology of interacting bosons
Authors: Erez Berg, Michael Levin and Ehud Altman
Categories: cond-mat.str-el cond-mat.stat-mech
Comments: 4.5 pages, 2 figures
   Interacting lattice bosons at integer filling can support two distinct
insulating phases, which are separated by a critical point: the Mott insulator
and the Haldane insulator[Phys. Rev. Lett. 97, 260401 (2006)]. The critical
point can be gapped out by breaking lattice inversion symmetry. Here, we show
that encircling this critical point adiabatically pumps one boson across the
system. When multiple chains are coupled, the two insulating phases are no
longer sharply distinct, but the pumping property survives. This leads to
strict constraints on the topology of the phase diagram of systems of quasi-one
dimensional interacting bosons.
\\ ( http://arxiv.org/abs/1008.1590 , 293kb)
Date: Tue, 10 Aug 2010 15:46:07 GMT (133kb)

Title: BCS as Foundation and Inspiration: The Transmutation of Symmetry
Authors: Frank Wilczek
Categories: cond-mat.supr-con cond-mat.str-el hep-th
Comments: 25 pages, 4 figures. Contribution to "Fifty Years of Bardeen, Cooper,
   and Schrieffer'', to be published by World Scientific
   The BCS theory injected two powerful ideas into the collective consciousness
of theoretical physics: pairing and spontaneous symmetry breaking. In the 50
years since the seminal work of Bardeen, Cooper, and Schrieffer, those ideas
have found important use in areas quite remote from the stem application to
metallic superconductivity. This is a brief and eclectic sketch of some
highlights, emphasizing relatively recent developments in QCD and in the theory
of quantum statistics, and including a few thoughts about future directions. A
common theme is the importance of symmetry {\it transmutation}, as opposed to
the simple {\it breaking} of electromagnetic $U(1)$ symmetry in classic
metallic superconductors.
\\ ( http://arxiv.org/abs/1008.1741 , 133kb)
arXiv:1008.1769 (*cross-listing*)
Date: Tue, 10 Aug 2010 18:45:40 GMT (2226kb)

Title: Design and Characterization of a Field-Switchable Nanomagnetic Atom
Authors: T.J. Hayward, A.D. West, K.J. Weatherill, P.J. Curran, P.W. Fry, P.M.
   Fundi, M.R.J. Gibbs, T. Schrefl, C.S. Adams, I.G. Hughes, S.J. Bending and
   D.A. Allwood
Categories: cond-mat.mes-hall physics.atom-ph
Comments: To appear in Journal of Applied Physics. Volume 108, issue 3
   We present a design for a switchable nanomagnetic atom mirror formed by an
array of 180{\deg} domain walls confined within Ni80Fe20 planar nanowires. A
simple analytical model is developed which allows the magnetic field produced
by the domain wall array to be calculated. This model is then used to optimize
the geometry of the nanowires so as to maximize the reflectivity of the atom
mirror. We then describe the fabrication of a nanowire array and characterize
its magnetic behavior using magneto-optic Kerr effect magnetometry, scanning
Hall probe microscopy and micromagnetic simulations, demonstrating how the
mobility of the domain walls allow the atom mirror to be switched "on" and
"off" in a manner which would be impossible for conventional designs. Finally,
we model the reflection of 87Rb atoms from the atom mirror's surface, showing
that our design is well suited for investigating interactions between domain
walls and cold atoms.
\\ ( http://arxiv.org/abs/1008.1769 , 2226kb)
Date: Tue, 10 Aug 2010 19:55:42 GMT (835kb)

Title: Spin Fluid Dynamics Observed by Magnetic Fountain Effect and
   Mechano-Spin Effect in the Ferromagnetic Superfluid $^3$He A$_1$ Phase
Authors: Y. Aoki, A. Yamaguchi, K. Suzuki, H. Ishimoto and H. Kojima
Categories: cond-mat.other
Comments: 12 pages, 15 figures, to appear in Physical Review B
   Systematic observations of the magnetically generated fountain pressure in
the superfluid $^3$He A$_1$ have been carried out in a newly built apparatus
designed to reduce the effect of thermal gradients. In the same apparatus,
mechanical pumping and filtering of polarized nuclear spins were realized by
the pneumatic pumping action of an electrostatically actuated membrane. In both
experiments, the measured induced pressure was observed to decay at all
temperatures where the A$_1$ phase appeared in magnetic fields up to 13 T and
liquid pressures between 1 and 29 bar. The inferred spin relaxation rate tended
to increase as the low temperature phase boundary with the A$_2$ phase
(T$_{C2}$) was approached. The increase in spin relaxation rate near T$_{C2}$
can be explained by the presence of a minority spin condensate in the A$_1$
phase as predicted by Monien and Tewordt and by the application of the
Leggett-Takagi theory of spin relaxation in superfluid $^3$He.
\\ ( http://arxiv.org/abs/1008.1780 , 835kb)
Date: Wed, 11 Aug 2010 00:32:47 GMT (149kb,D)

Title: Monte Carlo Simulations of Interacting Anyon Chains
Authors: Huan Tran and N. E. Bonesteel
Categories: cond-mat.dis-nn
Comments: 4 pages, 5 figures
Journal-ref: Computational Materials Science 2010
DOI: 10.1016/j.commatsci.2010.03.008
   A generalized version of the valence-bond Monte Carlo method is used to study
ground state properties of the 1+1 dimensional quantum $Q$-state Potts models.
For appropriate values of $Q$ these models can be used to describe interacting
chains of non-Abelian anyons --- quasiparticle excitations of certain exotic
fractional quantum Hall states.
\\ ( http://arxiv.org/abs/1008.1819 , 149kb)
Date: Wed, 11 Aug 2010 07:27:09 GMT (6kb)

Title: Poor man's derivation of the Bethe-Ansatz equations for the Dicke model
Authors: Oleksandr Tsyplyatyev, Jan von Delft, and Daniel Loss
Categories: cond-mat.other
Comments: 2 pages
   We present an elementary derivation of the exact solution (Bethe-Ansatz
equations) of the Dicke model, using only commutation relations and an informed
Ansatz for the structure of its eigenstates.
\\ ( http://arxiv.org/abs/1008.1844 , 6kb)
Date: Wed, 11 Aug 2010 07:37:53 GMT (1747kb)

Title: Chirp Control of Sinusoidal Lattice Modes in Bose-Einstein Condensate
Authors: Priyam Das and Prasanta K. Panigrahi
Categories: cond-mat.quant-gas
Comments: 9 pages, 2 figures
   A parametrically forced Bose-Einstein condensate (BEC) is studied in the mean
field approach for the case of a general moving optical lattice. The
interaction between the atoms in the condensate and the time dependent lattice
potential leads to a novel propagating superfluid matter wave, which can be
controlled through chirp management. This system, when placed in a trap,
accelerates and undergoes rapid nonlinear compression, controlled by the chirp.
The density achieves its maximum, precisely when the matter wave changes
direction. A dynamical phase transition is identified, which takes the
superfluid phase to an insulating state. The exact expression for energy is
obtained and analyzed in detail to gain physical understanding of the chirp
management of the sinusoidal excitations and also the dynamical phase
\\ ( http://arxiv.org/abs/1008.1847 , 1747kb)
Date: Wed, 11 Aug 2010 07:48:26 GMT (661kb)

Title: Quantum dots as handles for optical manipulation
Authors: Liselotte Jauffred, Marit Sletmoen, Fabian Czerwinski and Lene
Categories: physics.optics
Journal-ref: Proc. SPIE, 2010, 7762, 776226
   Individual colloidal quantum dots can be optically trapped and manipulated by
a single infrared laser beam operated at low laser powers. If the absorption
spectrum and the emission wavelength of the trapping laser are appropriately
chosen, the trapping laser light can act as a source for two-photon excitation
of the trapped quantum dot. This eliminates the need for an additional
excitation laser in experiments where individual quantum dots are used both as
force transducers and for visualization of the system. To use quantum dots as
handles for quantitative optical force transduction, it is crucial to perform a
precise force calibration. Here, we present an Allan variance analysis of
individual optically trapped quantum dots and show that the optimal measurement
time for experiments involving individual quantum dots is on the order of 0.3
seconds. Due to their small size and strong illumination, quantum dots are
optimal for single molecule assays where, optimally, the presence of the tracer
particle should not dominate the dynamics of the system. As an example, we
investigated the thermal fluctuations of a DNA tether using an individual
colloidal quantum dot as marker, this being the smallest tracer for tethered
particle method reported.
\\ ( http://arxiv.org/abs/1008.1849 , 661kb)
Date: Wed, 11 Aug 2010 08:45:21 GMT (358kb)

Title: Ion-assisted ground-state cooling of a trapped polar molecule
Authors: Zbigniew Idziaszek, Tommaso Calarco, Peter Zoller
Categories: physics.atom-ph
Comments: 17 pages, 13 figures
   We propose and analyze a scheme for sympathetic cooling of the translational
motion of polar molecules in an optical lattice, interacting one by one with
laser-cooled ions in a radio-frequency trap. The energy gap between the
excitation spectra of the particles in their respective trapping potentials is
bridged by means of a parametric resonance, provided by the additional
modulation of the RF field. We analyze two scenarios: simultaneous laser
cooling and energy exchange between the ion and the molecule, and a scheme when
these two processes take place separately. We calculate the lowest final energy
of the molecule and the cooling rate depending on the amplitude of the
parametric modulation. For small parametric modulation, the dynamics can be
solved analytically within the rotating wave approximation.
\\ ( http://arxiv.org/abs/1008.1858 , 358kb)
arXiv:1008.1867 (*cross-listing*)
Date: Wed, 11 Aug 2010 09:38:28 GMT (10kb)

Title: Dynamic coarse-graining approach to quantum field theory
Authors: Hans Christian \"Ottinger
Categories: math-ph hep-th math.MP quant-ph
Comments: 4 pages, no figures
   We build quantum field theory on the thermodynamic master equation for
dissipative quantum systems. The vacuum is represented by a thermodynamic
equilibrium state; even in the low-temperature limit, the population and
evolution of excited states matter. All regularization is consistently provided
by a friction mechanism; with decreasing friction parameter, only shorter and
shorter scales are damped out of a quantum field theory. No divergent integrals
need to be manipulated, no counterterms need to be invented. Relativistic
covariance is recovered in the final results. We illustrate the proposed
thermodynamic approach to quantum fields for the phi^4 theory.
\\ ( http://arxiv.org/abs/1008.1867 , 10kb)
arXiv:1008.1889 (*cross-listing*)
Date: Wed, 11 Aug 2010 11:28:12 GMT (451kb,D)

Title: Non Mean-Field Quantum Critical Points from Holography
Authors: Nick Evans, Kristan Jensen, and Keun-Young Kim
Categories: hep-th cond-mat.str-el hep-ph
Comments: 15 pages, 7 figures
   We construct a class of quantum critical points with non-mean-field critical
exponents via holography. Our approach is phenomenological. Beginning with the
D3/D5 system at nonzero density and magnetic field which has a chiral phase
transition, we simulate the addition of a third control parameter. We then
identify a line of quantum critical points in the phase diagram of this theory,
provided that the simulated control parameter has dimension less than two. This
line smoothly interpolates between a second-order transition with mean-field
exponents at zero magnetic field to a holographic
Berezinskii-Kosterlitz-Thouless transition at larger magnetic fields. The
critical exponents of these transitions only depend upon the parameters of an
emergent infrared theory. Moreover, the non-mean-field scaling is destroyed at
any nonzero temperature. We discuss how generic these transitions are.
\\ ( http://arxiv.org/abs/1008.1889 , 451kb)
arXiv:1008.1890 (*cross-listing*)
Date: Wed, 11 Aug 2010 11:36:12 GMT (730kb)

Title: Comparing the efficiency of numerical techniques for the integration of
   variational equations
Authors: E. Gerlach and Ch. Skokos
Categories: nlin.CD astro-ph.EP astro-ph.GA math-ph math.MP physics.comp-ph
Comments: 12 pages, 7 figures
   We present a comparison of different numerical techniques for the integration
of variational equations. The methods presented can be applied to any
autonomous Hamiltonian system whose kinetic energy is quadratic in the
generalized momenta, and whose potential is a function of the generalized
positions. We apply the various techniques to the well-known H\'enon-Heiles
system, and use the Smaller Alignment Index (SALI) method of chaos detection to
evaluate the percentage of its chaotic orbits. The accuracy and the speed of
the integration schemes in evaluating this percentage are used to investigate
the numerical efficiency of the various techniques.
\\ ( http://arxiv.org/abs/1008.1890 , 730kb)
Date: Wed, 11 Aug 2010 12:58:37 GMT (1179kb)

Title: Interacting fermions on the honeycomb bilayer: from weak to strong
Authors: Oskar Vafek
Categories: cond-mat.str-el hep-ph
Comments: 19 pages, 5 figures
   Many-body instabilities of the half-filled honeycomb bilayer are studied
using weak coupling renormalization group as well as strong coupling expansion.
For spinless fermions and assuming parabolic degeneracy, there are
4-independent four-fermion contact couplings. While the dominant instability
depends on the microscopic values of the couplings, the broken symmetry state
is typically a gapped insulator with either broken inversion symmetry or broken
time reversal symmetry, with a quantized anomalous Hall effect. Under certain
conditions, the dominant instability may appear in the particle-particle
(pairing) channel. For some non-generic fine-tuned initial conditions, weak
coupling RG trajectories flow into the non-interacting fixed point, although
generally we find runaway flows which we associate with ordering tendencies.
Additionally, a tight binding model with nearest neighbor hopping and nearest
neighbor repulsion is studied in weak and strong couplings and in each regime a
gapped phase with inversion symmetry breaking is found. In the strong coupling
limit, the ground state wavefunction is constructed for vanishing in-plane
hopping but finite inter-plane hopping, which explicitly displays the broken
inversion symmetry and a finite difference between the number of particles on
the two layers. Finally, we discuss the spin-1/2 case and use Fierz identities
to show that the number of independent 4-fermion contact couplings is 9. The
corresponding RG equations in the spin-1/2 case are also presented, and used to
show that, just as in strong coupling, the most dominant weak coupling
instability of the repulsive Hubbard model (at half-filling) is an
\\ ( http://arxiv.org/abs/1008.1901 , 1179kb)
Date: Wed, 11 Aug 2010 14:09:26 GMT (451kb)

Title: Highly-efficient state-selective sub-microsecond photoionization
   detection of single atoms
Authors: Florian Henkel, Michael Krug, Julian Hofmann, Wenjamin Rosenfeld,
   Markus Weber, Harald Weinfurter
Categories: quant-ph physics.atom-ph
Comments: 5 pages, 4 figures
   We experimentally demonstrate a detection scheme suitable for state analysis
of single optically trapped atoms in less than 1 {\mu}s with an overall
detection efficiency {\eta} exceeding 98%. The method is based on
hyperfine-state-selective photoionization and subsequent registration of the
correlated photoion-electron pairs by coincidence counting via two opposing
channel electron multipliers. The scheme enables the calibration of absolute
detection efficiencies and might be a key ingredient for future quantum
information applications or precision spectroscopy of ultracold atoms.
\\ ( http://arxiv.org/abs/1008.1910 , 451kb)
Date: Wed, 11 Aug 2010 14:58:00 GMT (215kb)

Title: Dynamics and thermalization in correlated one-dimensional lattice
Authors: Marcos Rigol
Categories: cond-mat.stat-mech cond-mat.quant-gas cond-mat.str-el
Comments: 13 pages, 4 figures, to appear in the book "Non-Equilibrium and
   Finite Temperature Quantum Gases", edited by M. Davis, S. Gardiner, N.
   Nygaard, N. Proukakis, and M. Szymanska, to be published by World Scientic
   We review exact approaches and recent results related to the relaxation
dynamics and description after relaxation of various one-dimensional lattice
systems of hard-core bosons after a sudden quench. We first analyze the
integrable case, where the combination of analytical insights and computational
techniques enable one to study large systems sizes. Thermalization does not
occur in that regime. However, after relaxation, observables can be described
by a generalization of the Gibbs ensemble. We then utilize full exact
diagonalization to study what happens as integrability is broken. We show that
thermalization does occur in finite nonintegrable systems provided they are
sufficiently far away from the integrable point. We argue that the onset of
thermalization can be understood in terms of the Eigenstate Thermalization
\\ ( http://arxiv.org/abs/1008.1930 , 215kb)
Date: Wed, 11 Aug 2010 20:01:47 GMT (423kb,D)

Title: Unitary expansion of the time evolution operator
Authors: N. Zagury, A. Aragao, J. Casanova, and E. Solano
Categories: quant-ph cond-mat.mes-hall cond-mat.supr-con
Comments: 6 pages, 7 figures
   We propose an expansion of the unitary evolution operator, associated to a
given Schr\"odinger equation, in terms of a finite product of explicit unitary
operators. In this manner, this unitary expansion can be truncated at the
desired level of approximation, as shown in the given examples.
\\ ( http://arxiv.org/abs/1008.1985 , 423kb)
Date: Thu, 12 Aug 2010 00:00:22 GMT (4709kb)

Title: Topological insulators and superconductors
Authors: Xiao-Liang Qi and Shou-Cheng Zhang
Categories: cond-mat.mes-hall cond-mat.supr-con
Comments: 55 pages, 44 figures, Review article commissioned by the Review of
   Modern Physics. Please help us to improve the article by emailing us your
   comments and missing references
   Topological insulators are new states of quantum matter which can not be
adiabatically connected to conventional insulators and semiconductors. They are
characterized by a full insulating gap in the bulk and gapless edge or surface
states which are protected by time-reversal symmetry. These topological
materials have been theoretically predicted and experimentally observed in a
variety of systems, including HgTe quantum wells, BiSb alloys, and Bi$_2$Te$_3$
and Bi$_2$Se$_3$ crystals. We review theoretical models, materials properties
and experimental results on two-dimensional and three-dimensional topological
insulators, and discuss both the topological band theory and the topological
field theory. Topological superconductors have a full pairing gap in the bulk
and gapless surface states consisting of Majorana fermions. We review the
theory of topological superconductors in close analogy to the theory of
topological insulators.
\\ ( http://arxiv.org/abs/1008.2026 , 4709kb)
Date: Thu, 12 Aug 2010 03:00:54 GMT (501kb)

Title: Narrow structure in the coherent population trapping resonances in
   rubidium and Rayleigh scattering
Authors: Sanka Gateva, Ljuan Gurdev, Emilia Alipieva, Elena Taskova and Georgi
Categories: physics.atom-ph
   The measurement of the coherent-population-trapping (CPT) resonances in
uncoated Rb vacuum cells has shown that the shape of the resonances is
different in different cells. In some cells the resonance has a complex shape -
a narrow Lorentzian structure, which is not power broadened, superimposed on
the power broadened CPT resonance. The results of the performed investigations
on the fluorescence angular distribution are in agreement with the assumption
that the narrow structure is a result of atom interaction with Rayleigh
scattering light. The results are interesting for indication of the vacuum
cleanness of the cells and building of magnetooptical sensors.
\\ ( http://arxiv.org/abs/1008.2033 , 501kb)
Date: Thu, 12 Aug 2010 03:52:16 GMT (37kb)

Title: Macroscopic Multi-Species Entanglement near Quantum Phase Transitions
Authors: V. Subrahmanyam
Categories: quant-ph cond-mat.stat-mech cond-mat.str-el
   Multi-Species entanglement, defined for a many-particle system as the
entanglement between different species of particles, is shown to exist in the
thermodynamic limit of the system size going to infinity. This macroscopic
entanglement, as it can exhibit singular behavior, is capable of tracking
quantum phase transitions. The entanglement between up and down spins has been
analytically calculated for the one-dimensional Ising model in a transverse
magnetic field. As the coupling strength is varied, the first derivative of the
entanglement shows a jump discontinuity and the second derivative diverges near
the quantum critical point.
\\ ( http://arxiv.org/abs/1008.2038 , 37kb)
Date: Thu, 12 Aug 2010 04:57:04 GMT (20kb)

Title: Exact and Approximate Solutions for the Dilute Ising Model
Authors: Maurizio Serva
Categories: cond-mat.dis-nn cond-mat.stat-mech
Comments: 18 pages, 4 figures
   The ground state energy and entropy of the dilute mean field Ising model is
computed exactly by a single order parameter. An analogous exact solution is
obtained in presence of a magnetic field with random locations. Results allow
for a complete understanding of the geography of the associated random graph.
In particular we give the size of the giant component (continent) and the
number of isolated clusters of connected spins of all given size (islands). We
also compute the average number of bonds per spin in the continent and in the
islands. Then, we tackle the problem of computing the free energy of the dilute
Ising model at strictly positive temperature. We are able to find out the exact
solution in the paramagnetic region and exactly determine the phase transition
line. In the ferromagnetic region we provide a solution in terms of an
expansion with respect to a second parameter which can be made as accurate as
necessary. All results are reached in the replica frame by a strategy which is
not based on multi-overlaps.
\\ ( http://arxiv.org/abs/1008.2045 , 20kb)
Date: Thu, 12 Aug 2010 07:59:24 GMT (106kb)

Title: Persistent currents of noninteracting electrons
Authors: Hamutal Bary-Soroker, Ora Entin-Wohlman, and Yoseph Imry
Categories: cond-mat.mes-hall
Comments: 10 pages, 4 figures
   We thoroughly study the persistent current of noninteracting electrons in
one, two, and three dimensional thin rings. We find that the results for
noninteracting electrons are more relevant for individual mesoscopic rings than
hitherto appreciated. The current is averaged over all configurations of the
disorder, whose amount is varied from zero up to the diffusive limit, keeping
the product of the Fermi wave number and the ring's circumference constant.
Results are given as functions of disorder and aspect ratios of the ring. The
magnitude of the disorder-averaged current may be larger than the
root-mean-square fluctuations of the current from sample to sample even when
the mean free path is smaller, but not too small, than the circumference of the
ring. Then a measurement of the persistent current of a typical sample will be
dominated by the magnitude of the disorder averaged current.
\\ ( http://arxiv.org/abs/1008.2060 , 106kb)
Date: Thu, 12 Aug 2010 09:44:19 GMT (710kb)

Title: Structural and dynamical aspects of avoided-crossing resonances in a
   $3$-level $\Lambda$ system
Authors: I. Lizuain, J. Echanobe, A. Ruschhaupt, J. G. Muga, D. A. Steck
Categories: quant-ph physics.atom-ph
Comments: 7 pages, 5 figures
   In a recent publication [Phys. Rev. A 79, 065602 (2009)] it was shown that an
avoided-crossing resonance can be defined in different ways, according to
level-structural or dynamical aspects, which do not coincide in general. Here a
simple $3$-level system in a $\Lambda$ configuration is discussed, where the
difference between both definitions of the resonance may be observed. We also
discuss the details of a proposed experiment to observe this difference, using
microwave fields coupling hyperfine magnetic sublevels in alkali atoms.
\\ ( http://arxiv.org/abs/1008.2078 , 710kb)
arXiv:1008.2085 (*cross-listing*)
Date: Thu, 12 Aug 2010 10:25:31 GMT (80kb)

Title: Axion cosmology in the laboratory
Authors: Christian Beck
Categories: astro-ph.CO cond-mat.supr-con hep-ex
Comments: 5 pages, 2 figures
   What do advanced Josephson junction technologies, SQUIDs, coupled Josephson
qubits and related superconducting devices used in nanotechnology have in
common with the problem of dark matter in the early universe? A lot more than
might seem obvious at first sight, as will be shown in this letter. One of the
major candidates for dark matter in the universe is the axion. The equation of
motion of the axion misalignment angle and that of the phase difference in a
Josephson junction are identical if the symbols in the mathematical equations
are properly re-interpreted. This allows for analogue simulation of
early-universe physics using superconducting electronic devices such as SQUIDs
and Josephson junctions. It also allows for new experimental setups that test
axionic interaction strengths in a Josephson junction environment, similar in
nature to recent experiments that test for quantum entanglement of two coupled
Josephson qubits. The parameter values relevant for early-universe axion
cosmology are accessible with present day's achievements in nanotechnology.
\\ ( http://arxiv.org/abs/1008.2085 , 80kb)
arXiv:1008.2096 (*cross-listing*)
Date: Thu, 12 Aug 2010 11:25:45 GMT (228kb)

Title: Dynamic localization of cold atoms in driven lattices: an overlooked
Authors: K. Kudo and T.S. Monteiro
Categories: cond-mat.quant-gas quant-ph
Comments: 5 pages, 2 figures
   Several recent theoretical and experimental studies have investigated the
dynamics of cold atoms in optical lattices by means of harmonic forcing
potentials of the general form $H_F(x,t)= F x \sin (\omega t + \phi)$, where
$\phi$ is some arbitrary phase. Renormalization of the tunneling amplitudes by
the field and thus control of both the wavepacket spreading and group velocity
have been demonstrated, as well as giant ``Super-Bloch" oscillations of the
atomic cloud. We show here that previous studies overlook an important phase
prefactor, present whenever $\phi \neq \pi/2$, and that its inclusion is
essential for full understanding of the dynamics seen in recent experiments. We
show that, for systems with strong attractive pairing, it enables different
types of collisions and recollisions between paired and unpaired atoms.
\\ ( http://arxiv.org/abs/1008.2096 , 228kb)
arXiv:1008.2100 (*cross-listing*)
Date: Thu, 12 Aug 2010 11:51:33 GMT (21kb)

Title: Towards Rigorous Derivation of Quantum Kinetic Equations
Authors: V.I. Gerasimenko, Zh.A. Tsvir
Categories: math-ph cond-mat.stat-mech math.MP quant-ph
Comments: 25 pages
MSC-class: 35Q40, 35Q82, 47J35, 82C10, 82C40
   We develop a rigorous formalism for the description of the evolution of
states of quantum many-particle systems in terms of a one-particle density
operator. For initial states which are specified in terms of a one-particle
density operator the equivalence of the description of the evolution of quantum
many-particle states by the Cauchy problem of the quantum BBGKY hierarchy and
by the Cauchy problem of the generalized quantum kinetic equation together with
a sequence of explicitly defined functionals of a solution of stated kinetic
equation is established in the space of trace class operators. The links of the
specific quantum kinetic equations with the generalized quantum kinetic
equation are discussed.
\\ ( http://arxiv.org/abs/1008.2100 , 21kb)
Date: Thu, 12 Aug 2010 11:57:53 GMT (10kb)

Title: A Lagrangian for Electromagnetic Solitary Waves in Vacuum
Authors: Daniele Funaro
Categories: physics.gen-ph
Comments: 12 pages
   A system of equations, describing the evolution of electromagnetic fields, is
introduced and discussed. The model is strictly related to Maxwell's equations.
As a matter of fact, the Lagrangian is the same, but the variations are
subjected to a suitable constraint. This allows to enlarge the space of
solutions, including for example solitary waves with compact support. In this
way, without altering the physics, one is able to deal with vector waves as
they were massless particles. The main properties of the model, together with
numerous exact explicit solutions are presented.
\\ ( http://arxiv.org/abs/1008.2103 , 10kb)
arXiv:1008.2125 (*cross-listing*)
Date: Thu, 12 Aug 2010 15:02:24 GMT (196kb)

Title: Step-like discontinuities in Bose-Einstein condensates and Hawking
   radiation: dispersion effects
Authors: Carlos Mayoral, Alessandro Fabbri and Massimiliano Rinaldi
Categories: gr-qc cond-mat.quant-gas hep-th
Comments: RevTex, 31 pages, 10 figures
   In this paper we extend the hydrodynamic results of [1] and study,
analytically, the propagation of Bogoliubov phonons on top of Bose-Einstein
condensates with step-like discontinuities by taking into account dispersion
effects. We focus on the Hawking signal in the density-density correlations in
the formation of acoustic black hole-like configurations.
\\ ( http://arxiv.org/abs/1008.2125 , 196kb)
Date: Thu, 12 Aug 2010 15:27:34 GMT (135kb,D)

Title: Smooth, holographically generated ring trap for the investigation of
   superfluidity in ultracold atoms
Authors: Graham D Bruce, James Mayoh, Giuseppe Smirne, Lara Torralbo-Campo and
   Donatella Cassettari
Categories: cond-mat.quant-gas
Comments: 8 pages, 3 figures
   We discuss the suitability of holographically generated optical potentials
for the investigation of superfluidity in ultracold atoms. By using a spatial
light modulator and a feedback enabled algorithm we generate a smooth ring with
variable bright regions that can be dynamically rotated to stir ultracold atoms
and induce superflow. We also comment on its future integration into a cold
atoms experiment.
\\ ( http://arxiv.org/abs/1008.2140 , 135kb)

The replacements:

replaced with revised version Fri, 6 Aug 2010 08:19:07 GMT (894kb)

Title: Influence of a Feshbach resonance on the photoassociation of LiCs
Authors: J. Deiglmayr, P. Pellegrini, A. Grochola, M. Repp, R. C\^ot\'e, O.
   Dulieu, R. Wester and M. Weidem\"uller
Categories: physics.atom-ph
Comments: Added Erratum, 20 pages, 9 figures
Journal-ref: New J. Phys. 11, 055034 (2009)
DOI: 10.1088/1367-2630/11/5/055034
\\ ( http://arxiv.org/abs/0903.2942 , 894kb)
replaced with revised version Fri, 6 Aug 2010 17:02:34 GMT (1732kb,D)

Title: Non-locality of Two Ultracold Trapped Atoms
Authors: Thom\'as Fogarty, John Goold, Mauro Paternostro and Thomas Busch
Categories: quant-ph
Comments: 14 pages, 7 figures
\\ ( http://arxiv.org/abs/1008.0962 , 1732kb)
replaced with revised version Fri, 6 Aug 2010 18:08:04 GMT (171kb)

Title: Effect of correlated noise on quasi-1D diffusion
Authors: D.V. Tkachenko, V.R. Misko, and F.M. Peeters
Categories: cond-mat.stat-mech
Comments: 5 pages, 2 figures, updated
\\ ( http://arxiv.org/abs/1002.2969 , 171kb)
arXiv:1006.0261 (*cross-listing*)
replaced with revised version Fri, 6 Aug 2010 21:22:55 GMT (666kb,D)

Title: Short-range force detection using optically-cooled levitated
Authors: Andrew A. Geraci, Scott B. Papp, and John Kitching
Categories: hep-ph quant-ph
Comments: 4 pages, 3 figures, minor changes, Figs. 1 and 2 replaced
\\ ( http://arxiv.org/abs/1006.0261 , 666kb)
arXiv:0912.4034 (*cross-listing*)
replaced with revised version Mon, 9 Aug 2010 06:16:30 GMT (3212kb)

Title: Dynamics of a Quantum Phase Transition and Relaxation to a Steady State
Authors: Jacek Dziarmaga
Categories: cond-mat.quant-gas cond-mat.mes-hall cond-mat.stat-mech
cond-mat.str-el cond-mat.supr-con quant-ph
Comments: 117 pages; review accepted in Advances in Physics
\\ ( http://arxiv.org/abs/0912.4034 , 3212kb)
replaced with revised version Mon, 9 Aug 2010 06:51:13 GMT (42kb)

Title: Spontaneous symmetry breakings in two-dimensional kagome lattice
Authors: Qin Liu, Hong Yao, Tianxing Ma
Categories: cond-mat.mtrl-sci cond-mat.str-el
Comments: 5 pages, 3 figures, Published in Phys. Rev. B
Journal-ref: Phys. Rev. B 82, 045102 (2010)
DOI: 10.1103/PhysRevB.82.045102
\\ ( http://arxiv.org/abs/1006.1707 , 42kb)
replaced with revised version Mon, 9 Aug 2010 09:11:16 GMT (408kb)

Title: Modified Fermi-sphere, pairing gap and critical temperature for the
   BCS-BEC crossover
Authors: S. Floerchinger, M. M. Scherer, C. Wetterich
Categories: cond-mat.quant-gas
Comments: 8 pages, 7 figures, minor changes, published version
Journal-ref: Phys.Rev.A81:063619,2010
\\ ( http://arxiv.org/abs/0912.4050 , 408kb)
replaced with revised version Mon, 9 Aug 2010 09:23:53 GMT (828kb)

Title: Parametrization of the transfer matrix: for one-dimensional Anderson
   model with diagonal disorder
Authors: Kai Kang, Shaojing Qin, Chuilin Wang
Categories: cond-mat.dis-nn
Comments: 14 pages, 4 figures
\\ ( http://arxiv.org/abs/0912.4876 , 828kb)
replaced with revised version Mon, 9 Aug 2010 10:52:49 GMT (609kb,D)

Title: Entanglement of mechanical oscillators coupled to a non-equilibrium
Authors: Max Ludwig, K. Hammerer, Florian Marquardt
Categories: quant-ph cond-mat.mes-hall
Journal-ref: Phys. Rev. A 82, 012333 (2010)
DOI: 10.1103/PhysRevA.82.012333
\\ ( http://arxiv.org/abs/0912.4499 , 609kb)
replaced with revised version Mon, 9 Aug 2010 15:57:21 GMT (200kb,D)

Title: Finite momentum condensation in a pumped microcavity
Authors: R. T. Brierley and P. R. Eastham
Categories: cond-mat.mes-hall cond-mat.str-el
Comments: 7 pages, 4 figures, updated to accepted version
Journal-ref: Phys. Rev. B 82, 035317 (2010)
DOI: 10.1103/PhysRevB.82.035317
\\ ( http://arxiv.org/abs/0912.1206 , 200kb)
replaced with revised version Mon, 9 Aug 2010 21:58:54 GMT (1634kb,D)

Title: Topological Insulators and Mott Physics from the Hubbard Interaction
Authors: Stephan Rachel, Karyn Le Hur
Categories: cond-mat.str-el
Comments: 20 pages, 12 figures; final published version
Journal-ref: Phys. Rev. B 82, 075106 (2010)
\\ ( http://arxiv.org/abs/1003.2238 , 1634kb)
replaced with revised version Mon, 9 Aug 2010 22:28:11 GMT (765kb)

Title: Resonant atom-field interaction in large-size coupled-cavity arrays
Authors: Francesco Ciccarello
Categories: quant-ph
Comments: 8 pages, 4 figures
\\ ( http://arxiv.org/abs/1008.0677 , 765kb)
replaced with revised version Tue, 10 Aug 2010 02:18:54 GMT (30kb)

Title: Microscopic Approach to Viscosities in Superfluid Fermi Gases: From BCS
   to BEC
Authors: H. Guo, D. Wulin, C. C. Chien, K. Levin
Categories: cond-mat.quant-gas
Comments: 4 pages, 2 figures
Report-no: LA-UR 10-05100
\\ ( http://arxiv.org/abs/1008.0423 , 30kb)
replaced with revised version Tue, 10 Aug 2010 09:12:11 GMT (360kb)

Title: Quantum phase transition of nonlinear light in the finite size Dicke
Authors: B. M. Rodr\'iguez-Lara and Ray-Kuang Lee
Categories: quant-ph
Comments: 17 pages, 2 figures, 1 table
\\ ( http://arxiv.org/abs/1005.3884 , 360kb)
replaced with revised version Tue, 10 Aug 2010 12:41:59 GMT (696kb)

Title: Interacting multi-component exciton gases in a potential trap: phase
   separation and Bose-Einstein condensation
Authors: S. Sobkowiak, D. Semkat, H. Stolz, Th. Koch, and H. Fehske
Categories: cond-mat.quant-gas
Comments: 7 pages, 6 figures
Journal-ref: Phys. Rev. B 82, 064505 (2010)
DOI: 10.1103/PhysRevB.82.064505
\\ ( http://arxiv.org/abs/1005.0458 , 696kb)
replaced with revised version Tue, 10 Aug 2010 17:54:06 GMT (167kb)

Title: Fundamental collapse of the exciton-exciton effective scattering
Authors: Laura Pilozzi, Monique Combescot, Odile Betbeder-Matibet, Andrea
Categories: cond-mat.mes-hall
Comments: Revised text version. Accepted for publication in Physical Review B
\\ ( http://arxiv.org/abs/1002.4492 , 167kb)
arXiv:1003.1757 (*cross-listing*)
replaced with revised version Tue, 10 Aug 2010 19:13:49 GMT (113kb,D)

Title: Creating a Quantum Degenerate Gas of Stable Molecules via Weak
Authors: Matt Mackie and Pierre Phou
Categories: cond-mat.quant-gas physics.atom-ph quant-ph
Comments: 4 pages, 5 figures, 1 table, 39 references; published version
Journal-ref: Phys. Rev. A 82, 011609(R) (2010)
DOI: 10.1103/PhysRevA.82.011609
\\ ( http://arxiv.org/abs/1003.1757 , 113kb)
arXiv:1006.2160 (*cross-listing*)
replaced with revised version Tue, 10 Aug 2010 19:20:28 GMT (189kb,D)

Title: Many-Body Rate Limit on Photoassociation of a Bose-Einstein Condensate
Authors: Matt Mackie and Pierre Phou
Categories: cond-mat.quant-gas physics.atom-ph quant-ph
Comments: 4 pages, 3 figures, 59 references. v2: discussion added; to appear in
\\ ( http://arxiv.org/abs/1006.2160 , 189kb)
replaced with revised version Wed, 11 Aug 2010 01:00:33 GMT (1511kb,D)

Title: Variational study of a two-level system coupled to a harmonic oscillator
   in a ultrastrong coupling regime
Authors: Myung-Joong Hwang and Mahn-Soo Choi
Categories: cond-mat.mes-hall
Comments: 4 pages; 3 figures; to appear in Phys. Rev. A
\\ ( http://arxiv.org/abs/1006.1989 , 1511kb)
replaced with revised version Wed, 11 Aug 2010 01:48:08 GMT (59kb)

Title: Stabilization of the p-wave superfluid state in an optical lattice
Authors: Y.-J. Han, Y.-H. Chan, W. Yi, A. J. Daley, S. Diehl, P. Zoller and
   L.-M. Duan
Categories: cond-mat.quant-gas cond-mat.str-el
Comments: 5 pages, 5 figures
Journal-ref: Physical Review Letters 103, 070404 (2009)
DOI: 10.1103/PhysRevLett.103.070404
\\ ( http://arxiv.org/abs/0905.2600 , 59kb)
replaced with revised version Wed, 11 Aug 2010 06:19:52 GMT (89kb)

Title: Spontaneous Vortex Production in Driven Condensates with Narrow Feshbach
Authors: Chi-Yong Lin, Da-Shin Lee and Ray J. Rivers
Categories: cond-mat.quant-gas
Comments: 4 pages, 1 figure, this updated version reaches the same conclusions
   as its predecessor, but differs in providing a more detailed analysis of the
   single-fluid approximation, a more useful Figure and a wider range of
   parameter values
\\ ( http://arxiv.org/abs/0908.4254 , 89kb)
arXiv:1007.3182 (*cross-listing*)
replaced with revised version Wed, 11 Aug 2010 06:46:41 GMT (1370kb,D)

Title: Variational methods with coupled Gaussian functions for Bose-Einstein
   condensates with long-range interactions. II. Applications
Authors: Stefan Rau, J\"org Main, Holger Cartarius, Patrick K\"oberle, G\"unter
Categories: cond-mat.quant-gas nlin.CD quant-ph
Comments: 14 pages, 14 figures, submitted to Phys. Rev. A, some equations
\\ ( http://arxiv.org/abs/1007.3182 , 1370kb)
arXiv:1007.3180 (*cross-listing*)
replaced with revised version Wed, 11 Aug 2010 08:56:16 GMT (18kb)

Title: Variational methods with coupled Gaussian functions for Bose-Einstein
   condensates with long-range interactions. I. General concept
Authors: Stefan Rau, J\"org Main, G\"unter Wunner
Categories: cond-mat.quant-gas nlin.CD quant-ph
Comments: 10 pages, submitted to Phys. Rev. A, minor corrections
\\ ( http://arxiv.org/abs/1007.3180 , 18kb)
arXiv:0912.3485 (*cross-listing*)
replaced with revised version Wed, 11 Aug 2010 15:42:44 GMT (246kb)

Title: Zeno physics in ultrastrong circuit QED
Authors: I. Lizuain, J. Casanova, J. J. Garcia-Ripoll, J. G. Muga, and E.
Categories: cond-mat.mes-hall cond-mat.supr-con quant-ph
Comments: 5 pages, 3 figures
Journal-ref: Phys. Rev. A 81, 062131 (2010)
DOI: 10.1103/PhysRevA.81.062131
\\ ( http://arxiv.org/abs/0912.3485 , 246kb)
replaced with revised version Wed, 11 Aug 2010 15:52:22 GMT (930kb)

Title: Dressing of Ultracold Atoms by their Rydberg States in a Ioffe-Pritchard
Authors: Michael Mayle, Igor Lesanovsky, Peter Schmelcher
Categories: physics.atom-ph
Comments: 11 pages, 4 figures
Journal-ref: J. Phys. B 43, 155003 (2010)
DOI: 10.1088/0953-4075/43/15/155003
\\ ( http://arxiv.org/abs/1002.2870 , 930kb)
replaced with revised version Wed, 11 Aug 2010 16:05:25 GMT (82kb)

Title: Two-body recombination in a quantum mechanical lattice gas: Entropy
   generation and probing of magnetic short-range magnetic correlations
Authors: Stefan K. Baur, Erich J. Mueller
Categories: cond-mat.quant-gas
Comments: 6 pages, 3 figures - v3: updated references, minor changes
\\ ( http://arxiv.org/abs/1003.5235 , 82kb)
replaced with revised version Thu, 12 Aug 2010 02:06:08 GMT (13kb)

Title: Quantum anholonomies in time-dependent Aharonov-Bohm rings
Authors: Atushi Tanaka and Taksu Cheon
Categories: quant-ph cond-mat.mes-hall cond-mat.quant-gas nucl-th
Comments: 6 pages. Fixed typo
Journal-ref: Phys. Rev. A 82, 022104 (2010)
DOI: 10.1103/PhysRevA.82.022104
\\ ( http://arxiv.org/abs/1006.2913 , 13kb)
replaced with revised version Thu, 12 Aug 2010 02:43:35 GMT (256kb)

Title: Analysis of Exactness of the Mean-Field Theory in Long-Range Interacting
Authors: Takashi Mori
Categories: cond-mat.stat-mech
Comments: 4 pages, 5 figures; clarifications and discussion about boundary
   effects is added
\\ ( http://arxiv.org/abs/1004.3622 , 256kb)
replaced with revised version Thu, 12 Aug 2010 04:02:32 GMT (4190kb,D)

Title: Generation of directional, coherent matter beams through dynamical
   instabilities in Bose-Einstein condensates
Authors: Graham R. Dennis and Mattias T. Johnsson
Categories: quant-ph
Comments: Corrected references
\\ ( http://arxiv.org/abs/1008.1831 , 4190kb)
replaced with revised version Thu, 12 Aug 2010 08:42:37 GMT (1195kb,D)

Title: Ultracold atoms in an optical lattice with dynamically variable
Authors: S. Al-Assam, R. A. Williams, C. J. Foot
Categories: cond-mat.quant-gas
Comments: 4 pages, 3 figures. Minor changes made and references updated
Journal-ref: Phys. Rev. A 82, 021604(R) (2010)
DOI: 10.1103/PhysRevA.82.021604
\\ ( http://arxiv.org/abs/1005.4816 , 1195kb)
arXiv:0907.2193 (*cross-listing*)
replaced with revised version Thu, 12 Aug 2010 11:01:45 GMT (655kb)

Title: Functional renormalization group approach to the BCS-BEC crossover
Authors: S. Diehl, S. Floerchinger, H. Gies, J. M. Pawlowski, C. Wetterich
Categories: cond-mat.quant-gas hep-th quant-ph
Comments: 30 pages, 13 figures
Journal-ref: Ann. Phys. (Berlin) 522, No. 9, 615 - 656 (2010)
DOI: 10.1002/andp.201010458
\\ ( http://arxiv.org/abs/0907.2193 , 655kb)
replaced with revised version Thu, 12 Aug 2010 18:17:41 GMT (368kb)

Title: Newton's cradle and entanglement transport in a flexible Rydberg chain
Authors: S. W\"uster, C. Ates, A. Eisfeld and J.-M. Rost
Categories: physics.atom-ph
Comments: 4 pages, 3 figures. Revised version
Journal-ref: Phys. Rev. Lett. 105 (2010) 053004
DOI: 10.1103/PhysRevLett.105.053004
\\ ( http://arxiv.org/abs/1004.4577 , 368kb)

Till next time,

Dr M. J. Davis,                      Associate Professor in Physics
School of Mathematics and Physics,   ph  : +61 7 334 69824
The University of Queensland,        fax : +61 7 336 51242
Brisbane, QLD 4072,                  mdavis_at_physics.uq.edu.au
Australia.                           www.physics.uq.edu.au/people/mdavis/
Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org
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Received on Wed Oct 20 2010 - 09:28:34 EST

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