From: Matthew Davis <mdavis_at_physics.uq.edu.au>

Date: Tue, 19 Oct 2010 22:55:08 +1000

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.

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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

space.

\\ ( http://arxiv.org/abs/1008.1539 , 117kb)

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arXiv:1008.1065

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)

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arXiv:1008.1093

Date: Thu, 5 Aug 2010 21:56:14 GMT (37kb)

Title: Quantum phase transitions in coupled two-level atoms in a single-mode

cavity

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)

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arXiv:1008.1106

Date: Fri, 6 Aug 2010 02:08:19 GMT (54kb)

Title: Influence of superohmic dissipation on a disordered quantum critical

point

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

Matter

\\

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)

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arXiv:1008.1122

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)

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arXiv:1008.1129

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.

Weidem\"uller

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)

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arXiv:1008.1141

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)

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arXiv:1008.1163

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

experiments.

\\ ( http://arxiv.org/abs/1008.1163 , 91kb)

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arXiv:1008.1174

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)

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arXiv:1008.1192

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

state.

\\ ( http://arxiv.org/abs/1008.1192 , 18kb)

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arXiv:1008.1194

Date: Fri, 6 Aug 2010 13:33:52 GMT (107kb)

Title: Fractional vortices and a Bean-Livingston barrier in two-component

superconductors

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)

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arXiv:1008.1198

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

Hu

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)

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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

solver.

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)

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arXiv:1008.1252

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)

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arXiv:1008.1255

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

SPC.

\\ ( http://arxiv.org/abs/1008.1255 , 133kb)

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arXiv:1008.1258

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)

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arXiv:1008.1272

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)

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arXiv:1008.1285

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)

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arXiv:1008.1306

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,

Idia)

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)

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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)

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arXiv:1008.1379

Date: Sun, 8 Aug 2010 04:14:50 GMT (27kb)

Title: Wheels within wheels: Hamiltonian dynamics as a hierarchy of action

variables

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)

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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)

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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)

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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.

Clark

Categories: physics.optics cond-mat.quant-gas quant-ph

Comments: Document available from the U.S. National Institute of Standards and

Technology at

http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906138

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)

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arXiv:1008.1457

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)

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arXiv:1008.1524

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)

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arXiv:1008.1548

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)

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arXiv:1008.1551

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)

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\\

arXiv:1008.1562

Date: Mon, 9 Aug 2010 18:15:01 GMT (73kb)

Title: Scattering theory and the Aharonov--Bohm effect in quasiclassical

physics

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)

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\\

arXiv:1008.1590

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)

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\\

arXiv:1008.1741

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)

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\\

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

Mirror

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)

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\\

arXiv:1008.1780

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)

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\\

arXiv:1008.1819

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)

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\\

arXiv:1008.1844

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)

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\\

arXiv:1008.1847

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

transition.

\\ ( http://arxiv.org/abs/1008.1847 , 1747kb)

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\\

arXiv:1008.1849

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

Oddershede

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)

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\\

arXiv:1008.1858

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)

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\\

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)

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\\

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)

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\\

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)

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\\

arXiv:1008.1901

Date: Wed, 11 Aug 2010 12:58:37 GMT (1179kb)

Title: Interacting fermions on the honeycomb bilayer: from weak to strong

coupling

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

anti-ferromagnet.

\\ ( http://arxiv.org/abs/1008.1901 , 1179kb)

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\\

arXiv:1008.1910

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)

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\\

arXiv:1008.1930

Date: Wed, 11 Aug 2010 14:58:00 GMT (215kb)

Title: Dynamics and thermalization in correlated one-dimensional lattice

systems

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

Hypothesis.

\\ ( http://arxiv.org/abs/1008.1930 , 215kb)

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\\

arXiv:1008.1985

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)

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\\

arXiv:1008.2026

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)

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\\

arXiv:1008.2033

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

Todorov

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)

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\\

arXiv:1008.2038

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)

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\\

arXiv:1008.2045

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)

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\\

arXiv:1008.2060

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)

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\\

arXiv:1008.2078

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)

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\\

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)

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\\

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

phase

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)

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\\

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)

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\\

arXiv:1008.2103

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)

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\\

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)

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\\

arXiv:1008.2140

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)

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The replacements:

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\\

arXiv:0903.2942

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)

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\\

arXiv:1008.0962

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)

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\\

arXiv:1002.2969

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)

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\\

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

microspheres

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)

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\\

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)

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\\

arXiv:1006.1707

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)

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\\

arXiv:0912.4050

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)

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\\

arXiv:0912.4876

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)

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\\

arXiv:0912.4499

replaced with revised version Mon, 9 Aug 2010 10:52:49 GMT (609kb,D)

Title: Entanglement of mechanical oscillators coupled to a non-equilibrium

environment

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)

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\\

arXiv:0912.1206

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)

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\\

arXiv:1003.2238

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)

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\\

arXiv:1008.0677

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)

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\\

arXiv:1008.0423

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)

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\\

arXiv:1005.3884

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

Hamiltonian

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)

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\\

arXiv:1005.0458

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)

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\\

arXiv:1002.4492

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

D'Andrea

Categories: cond-mat.mes-hall

Comments: Revised text version. Accepted for publication in Physical Review B

\\ ( http://arxiv.org/abs/1002.4492 , 167kb)

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\\

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

Photoassociation

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

(essentially)

Journal-ref: Phys. Rev. A 82, 011609(R) (2010)

DOI: 10.1103/PhysRevA.82.011609

\\ ( http://arxiv.org/abs/1003.1757 , 113kb)

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\\

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

PRA

\\ ( http://arxiv.org/abs/1006.2160 , 189kb)

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\\

arXiv:1006.1989

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)

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\\

arXiv:0905.2600

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)

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\\

arXiv:0908.4254

replaced with revised version Wed, 11 Aug 2010 06:19:52 GMT (89kb)

Title: Spontaneous Vortex Production in Driven Condensates with Narrow Feshbach

Resonances

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)

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\\

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

Wunner

Categories: cond-mat.quant-gas nlin.CD quant-ph

Comments: 14 pages, 14 figures, submitted to Phys. Rev. A, some equations

corrected

\\ ( http://arxiv.org/abs/1007.3182 , 1370kb)

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\\

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)

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\\

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.

Solano

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)

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arXiv:1002.2870

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

Trap

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)

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\\

arXiv:1003.5235

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)

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\\

arXiv:1006.2913

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)

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\\

arXiv:1004.3622

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

Systems

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)

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\\

arXiv:1008.1831

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)

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\\

arXiv:1005.4816

replaced with revised version Thu, 12 Aug 2010 08:42:37 GMT (1195kb,D)

Title: Ultracold atoms in an optical lattice with dynamically variable

periodicity

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)

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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)

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arXiv:1004.4577

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)

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Till next time,

Matt.

-- ========================================================================= 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 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 ========================================================================= _______________________________________________ Matts-arxiv mailing list Matts-arxiv_at_lists.sps.uq.edu.auReceived on Wed Oct 20 2010 - 09:28:34 EST

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