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

Date: Fri, 1 Dec 2006 18:01:43 +1000 (EST)

Date: Fri, 1 Dec 2006 18:01:43 +1000 (EST)

The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>

Early as promised for once! Twenty six new papers this week:

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Paper: cond-mat/0611612

Date: Thu, 23 Nov 2006 14:13:27 GMT (544kb)

Title: Microscopic Quantum Mechanical Foundation of Fourier's Law

Authors: Mathias Michel (1), Jochen Gemmer (2), G\"unter Mahler (1) ((1)

Institut f\"ur Theoretische Physik I, Universit\"at Stuttgart, Germany (2)

Fachbereich Physik, Universit\"at Osnabr\"uck, Germany)

Comments: 30 pages, 10 figures, review article

Subj-class: Statistical Mechanics

Journal-ref: Int. J. Mod. Phys. B 20,4855-4883 (2006)

DOI: 10.1142/S0217979206035849

\\

Besides the growing interest in old concepts like temperature and entropy at

the nanoscale, theories of relaxation and transport have recently regained a

lot of attention. With the electronic circuits and computer chips getting

smaller and smaller, a fresh look should be appropriate on the equilibrium and

nonequilibrium thermodynamics at small length scales far below the

thermodynamic limit, i.e. on the theoretical understanding of original

macroscopic processes, e.g. transport of energy, heat, charge, mass,

magnetization etc. Only from the foundations of a theory its limits of

applicability may be inferred. This review tries to give an overview of the

background and recent developments in the field of nonequilibrium quantum

thermodynamics focusing on the transport of heat in small quantum systems.

\\ ( http://arXiv.org/abs/cond-mat/0611612 , 544kb)

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Paper: cond-mat/0611620

Date: Fri, 24 Nov 2006 01:35:27 GMT (143kb)

Title: Bond algebraic liquid phase in strongly correlated multiflavor cold atom

systems

Authors: Cenke Xu and Matthew P. A. Fisher

Comments: 15 pages, 10 figures

Subj-class: Strongly Correlated Electrons; Soft Condensed Matter

\\

When cold atoms are trapped in a square or cubic optical lattice, it should

be possible to pump the atoms into excited $p-$level orbitals within each well.

Following earlier work, we explore the metastable equilibrium that can be

established before the atoms decay into the $s-$wave orbital ground state. We

will discuss the situation with integer number of bosons on every site, and

consider the strong correlation "insulating" regime. By employing a spin-wave

analysis together with a new duality transformation, we establish the existence

and stability of a novel gapless "critical phase", which we refer to as a "bond

algebraic liquid". The gapless nature of this phase is stabilized due to the

emergence of symmetries which lead to a quasi-one dimensional behavior. Within

the algebraic liquid phase, both bond operators and particle flavor occupation

number operators have correlations which decay algebraically in space and time.

Upon varying parameters, the algebraic bond liquid can be unstable to either a

Mott insulator phase which spontaneously breaks lattice symmetries, or a

$\mathbb{Z}_2$ phase. The possibility of detecting the algebraic liquid phase

in cold atom experiments is addressed. Although the momentum distribution

function is insufficient to distinguish the algebraic bond liquid from other

phases, the density correlation function can in principle be used to detect

this new phase of matter.

\\ ( http://arXiv.org/abs/cond-mat/0611620 , 143kb)

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Paper: cond-mat/0611629

Date: Fri, 24 Nov 2006 11:23:10 GMT (272kb)

Title: Experimental Evidence for Efimov Quantum States

Authors: H.-C. Naegerl, T. Kraemer, M. Mark, P. Waldburger, J. G. Danzl, B.

Engeser, A. D. Lange, K. Pilch, A. Jaakkola, C. Chin, R. Grimm

Comments: 8 pages, 4 figures, Proceedings of ICAP-2006 (Innsbruck)

Subj-class: Other

\\

Three interacting particles form a system which is well known for its complex

physical behavior. A landmark theoretical result in few-body quantum physics is

Efimov's prediction of a universal set of weakly bound trimer states appearing

for three identical bosons with a resonant two-body interaction. Surprisingly,

these states even exist in the absence of a corresponding two-body bound state

and their precise nature is largely independent of the particular type of the

two-body interaction potential. Efimov's scenario has attracted great interest

in many areas of physics; an experimental test however has not been achieved.

We report the observation of an Efimov resonance in an ultracold thermal gas of

cesium atoms. The resonance occurs in the range of large negative two-body

scattering lengths and arises from the coupling of three free atoms to an

Efimov trimer. We observe its signature as a giant three-body recombination

loss when the strength of the two-body interaction is varied near a Feshbach

resonance. This resonance develops into a continuum resonance at non-zero

collision energies, and we observe a shift of the resonance position as a

function of temperature. We also report on a minimum in the recombination loss

for positive scattering lengths, indicating destructive interference of decay

pathways. Our results confirm central theoretical predictions of Efimov physics

and represent a starting point from which to explore the universal properties

of resonantly interacting few-body systems.

\\ ( http://arXiv.org/abs/cond-mat/0611629 , 272kb)

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Paper: quant-ph/0611236

Date: Thu, 23 Nov 2006 07:57:16 GMT (353kb)

Title: First measurements of the index of refraction of gases for lithium

atomic waves

Authors: Marion Jacquey (LCAR), Matthias B\"{u}chner (LCAR), G\'{e}rard

Tr\'{e}nec (LCAR), Jacques Vigu\'{e} (LCAR)

Proxy: ccsd hal-00115743

\\

We report here the first measurements of the index of refraction of gases for

lithium waves. Using an atom interferometer, we have measured the real and

imaginary part of the index of refraction $n$ for argon, krypton and xenon, as

a function of the gas density for several velocities of the lithium beam. The

linear dependence of $(n-1)$ with the gas density is well verified. The total

collision cross-section deduced from the imaginary part is in very good

agreement with traditional measurements of this quantity. Finally, as predicted

by theory, the real and imaginary parts of $(n-1)$ and their ratio $\rho$

exhibit glory oscillations.

\\ ( http://arXiv.org/abs/quant-ph/0611236 , 353kb)

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Paper: quant-ph/0611240

Date: Thu, 23 Nov 2006 17:14:24 GMT (141kb)

Title: Radio-frequency-dressed atoms beyond the rotating wave approximation

Authors: S. Hofferberth, B. Fischer, T. Schumm, J. Schmiedmayer, and I.

Lesanovsky

\\

We study atoms dressed with a strong radio-frequency field in a regime where

the rotating wave approximation (RWA) breaks down. We present a full

calculation of the atom - field coupling which shows that the non-RWA

contributions quantitatively alter the shape of the emerging dressed adiabatic

potentials. Furthermore they lead to additional allowed transitions between

dressed levels. We use RF spectroscopy of Bose-Einstein condensates trapped in

the dressed state potentials to directly observe the transition from the RWA to

the beyond-RWA regime.

\\ ( http://arXiv.org/abs/quant-ph/0611240 , 141kb)

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Paper: quant-ph/0611246

Date: Fri, 24 Nov 2006 08:54:44 GMT (490kb)

Title: Universal Quantum Computation in a Neutral Atom Decoherence Free

Subspace

Authors: E. Brion, L. H. Pedersen, K. Molmer, S. Chutia, M. Saffman

Comments: 7 pages, 8 figures

\\

In this paper, we propose a way to achieve protected universal computation in

a neutral atom quantum computer subject to collective dephasing. Our proposal

relies on the existence of a Decoherence Free Subspace (DFS), resulting from

symmetry properties of the errors. After briefly describing the physical system

and the error model considered, we show how to encode information into the DFS

and build a complete set of safe universal gates. Finally, we provide numerical

simulations for the fidelity of the different gates in the presence of

time-dependent phase errors and discuss their performance and practical

feasibility.

\\ ( http://arXiv.org/abs/quant-ph/0611246 , 490kb)

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Paper: quant-ph/0611254

Date: Fri, 24 Nov 2006 20:29:57 GMT (310kb)

Title: Laser-noise-induced correlations and anti-correlations in

Electromagnetically Induced Transparency

Authors: L. S. Cruz, D. Felinto, J. G. Aguirre G\'omez, M. Martinelli\inst{1},

P. Valente, A. Lezama, and P. Nussenzveig

Comments: Accepted for publication in EPJ D

\\

High degrees of intensity correlation between two independent lasers were

observed after propagation through a rubidium vapor cell in which they generate

Electromagnetically Induced Transparency (EIT). As the optical field

intensities are increased, the correlation changes sign (becoming

anti-correlation). The experiment was performed in a room temperature rubidium

cell, using two diode lasers tuned to the $^{85}$Rb $D_2$ line ($\lambda =

780$nm). The cross-correlation spectral function for the pump and probe fields

is numerically obtained by modeling the temporal dynamics of both field phases

as diffusing processes. We explored the dependence of the atomic response on

the atom-field Rabi frequencies, optical detuning and Doppler width. The

results show that resonant phase-noise to amplitude-noise conversion is at the

origin of the observed signal and the change in sign for the correlation

coefficient can be explained as a consequence of the competition between EIT

and Raman resonance processes.

\\ ( http://arXiv.org/abs/quant-ph/0611254 , 310kb)

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Paper: physics/0611237

Date: Fri, 24 Nov 2006 16:19:51 GMT (172kb)

Title: Crossover to a quasi-condensate in a weakly interacting trapped 1D Bose

gas

Authors: Isabelle Bouchoule (LCFIO), Karen V. Kheruntsyan (ARC Centre of

Excellence for Quantum-Atom Optics), Gora Shlyapnikov (LPTMS)

Comments: 4 pages

Proxy: ccsd hal-00116204

Subj-class: Atomic Physics

\\

We discuss the transition from a fully decoherent to a (quasi-)condensate

regime in a harmonically trapped weakly interacting 1D Bose gas. By using

analytic approaches and verifying them against exact numerical solutions, we

find a characteristic crossover temperature and crossover atom number that

depend on the interaction strength and the trap frequency. We then identify the

conditions for observing either an interaction-induced crossover scenario or

else a finite-size Bose-Einstein condensation phenomenon characteristic of an

\textit{ideal} trapped 1D gas.

\\ ( http://arXiv.org/abs/physics/0611237 , 172kb)

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Paper: physics/0611235

Date: Fri, 24 Nov 2006 14:38:36 GMT (410kb)

Title: Cooling of a micro-mechanical oscillator using radiation pressure

induced dynamical back-action

Authors: A. Schliesser, P. Del Haye, N. Nooshi, K.J. Vahala, T.J. Kippenberg

Comments: accepted for publication (Phys. Rev. Lett.)

Subj-class: Optics

\\

Cooling of a 58 MHz micro-mechanical resonator from room temperature to 11 K

is demonstrated using cavity enhanced radiation pressure. Detuned pumping of an

optical resonance allows enhancement of the blue shifted motional sideband

(caused by the oscillator's Brownian motion) with respect to the red-shifted

sideband leading to cooling of the mechanical oscillator mode. The reported

cooling mechanism is a manifestation of the effect of radiation pressure

induced dynamical backaction. These results constitute an important step

towards achieving ground state cooling of a mechanical oscillator.

\\ ( http://arXiv.org/abs/physics/0611235 , 410kb)

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Paper: cond-mat/0611645

Date: Sun, 26 Nov 2006 23:07:13 GMT (44kb)

Title: A study of classical field techniques for condensates in one-dimensional

rings at finite temperatures

Authors: A. Nunnenkamp, J. N. Milstein and K. Burnett

Comments: 7 pages, 7 figures

Subj-class: Other

\\

For a condensate in a one-dimensional ring geometry, we compare the

thermodynamic properties of three conceptually different classical field

techniques: stochastic dynamics, microcanonical molecular dynamics, and the

classical field method. Starting from non-equilibrium initial conditions, all

three methods approach steady states whose distribution and correlation

functions are in excellent agreement with an exact evaluation of the partition

function in the high-temperature limit. Our study helps to establish these

various classical field techniques as powerful non-perturbative tools for

systems at finite temperatures.

\\ ( http://arXiv.org/abs/cond-mat/0611645 , 44kb)

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Paper: physics/0611246

Date: Sun, 26 Nov 2006 08:16:57 GMT (469kb)

Title: Optical Magnetometry

Authors: D. Budker and M. V. Romalis

Comments: 11 pages; 4 figures; submitted to Nature Physics

Subj-class: Atomic Physics; Instrumentation and Detectors

\\

Some of the most sensitive methods of measuring magnetic fields utilize

interactions of resonant light with atomic vapor. Recent developments in this

vibrant field are improving magnetometers in many traditional areas such as

measurement of geomagnetic anomalies and magnetic fields in space, and are

opening the door to new ones, including, dynamical measurements of bio-magnetic

fields, detection of nuclear magnetic resonance (NMR), magnetic-resonance

imaging (MRI), inertial-rotation sensing, magnetic microscopy with cold atoms,

and tests of fundamental symmetries of Nature.

\\ ( http://arXiv.org/abs/physics/0611246 , 469kb)

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Paper: physics/0611250

Date: Sun, 26 Nov 2006 20:30:20 GMT (304kb)

Title: Rubidium "whiskers" in a vapor cell

Authors: M. V. Balabas, A. O. Sushkov, and D. Budker

Comments: 2 pages, 1 figure

Subj-class: Atomic Physics; General Physics

\\

Crystals of metallic rubidium are observed ``growing'' from paraffin coating

of buffer-gas-free glass vapor cells. The crystals have uniform square

cross-section, $\approx 35 \mu$m on the side, and reach several mm in length.

\\ ( http://arXiv.org/abs/physics/0611250 , 303kb)

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Paper: cond-mat/0611688

Date: Mon, 27 Nov 2006 23:16:00 GMT (217kb)

Title: Decoherence of Macroscopic States at Finite Temperatures

Authors: Carlos L. Benavides and Claudia M. Ojeda

Comments: 9 pages, 3 figures

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We study the macroscopic superposition of light coherent states of the type

Schrodinger cat states; analizying, in particular, the role of the temperature

in the decoherence processes, characteristic of the superposition of

macroscopic states. The method we use here is based on the Master equation

formalism, introducing an original approach. We use a modified Mandel function

that is well adapted to the problem. This work is motivated by the experiments

proposed by S. Haroche and collaborators in the 90's. In these experiments two

Rydberg atoms were sent to a cavity in which a coherent state had been

previously injected, monitoring the decay of quantum states due to dissipation.

We find Haroche and collaborator's result at zero temperature and we predict

the behavior of the field states in the cavity at finite temperatures.

\\ ( http://arXiv.org/abs/cond-mat/0611688 , 217kb)

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Paper: cond-mat/0611689

Date: Mon, 27 Nov 2006 22:38:45 GMT (55kb)

Title: Probing $n$-Spin Correlations in Optical Lattices

Authors: Chuanwei Zhang, V. W. Scarola, and S. Das Sarma

Comments: 5 pages, 3 figures

Subj-class: Strongly Correlated Electrons; Other

\\

We propose a technique to measure multi-spin correlation functions of

arbitrary range as determined by the ground states of spinful cold atoms in

optical lattices. We show that an observation of the atomic version of the

Stokes parameters, using focused lasers and microwave pulsing, can be related

to $n$-spin correlators. We discuss the possibility of detecting not only

ground state static spin correlations, but also time-dependent spin wave

dynamics as a demonstrative example using our proposed technique.

\\ ( http://arXiv.org/abs/cond-mat/0611689 , 55kb)

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Paper: cond-mat/0611690

Date: Tue, 28 Nov 2006 18:51:35 GMT (200kb)

Title: Collective excitations and instability of an optical lattice due to

unbalanced pumping

Authors: J. K. Asboth, H. Ritsch, P. Domokos

Comments: 5 pages, submitted to Phys. Rev. Lett

Subj-class: Other

\\

We solve the self-consistent, coupled equations of motion for trapped atoms

and the field of a one-dimensional optical lattice in the large detuning limit.

In steady state the refractive index of the particles reduces the lattice

constant, an effect, which is greatly enhanced if the lattice is formed by

unbalanced pump beams. For pump asymmetry above a finite value, independent of

the lattice size, no equilibrium configuration exists. Below this limit, the

optomechanical coupling mediates collective oscillations of the particles

around their steady state positions, which for asymmetric pumping take the form

of traveling density waves. Above an asymmetry threshold, which decreases with

the lattice size, these waves are amplified and the equilibrium becomes

unstable, even in the presence of arbitrarily large viscous damping.

\\ ( http://arXiv.org/abs/cond-mat/0611690 , 200kb)

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Paper: cond-mat/0611699

Date: Tue, 28 Nov 2006 06:49:00 GMT (62kb)

Title: Emergence of Wigner molecules in one-dimensional systems of repulsive

fermions under harmonic confinement

Authors: S.H. Abedinpour, M. Polini, Gao Xianlong, and M.P. Tosi

Comments: 3 pages, 2 figures, submitted

Subj-class: Strongly Correlated Electrons

\\

A Bethe-Ansatz spin-density functional approach is developed to evaluate the

ground-state density profile in a system of repulsively interacting spin-1/2

fermions inside a quasi-one-dimensional harmonic well. The approach allows for

the formation of antiferromagnetic quasi-order with increasing coupling

strength and reproduces with high accuracy the exact solution that is available

for the two-fermion system.

\\ ( http://arXiv.org/abs/cond-mat/0611699 , 62kb)

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Paper: cond-mat/0611710

Date: Tue, 28 Nov 2006 12:30:02 GMT (40kb)

Title: Superfluid - Bose glass transition in two dimensions at T = 0: analytic

solution of a mode-coupling toy model

Authors: E.V. Zenkov

Comments: 5 pages, 2 figures

Subj-class: Strongly Correlated Electrons

Journal-ref: Europhys.Lett. 69, 390-396 (2005)

\\

Analytic expression for the memory function and the optical conductivity of

the two-dimensional Bose gas with logarithmic interaction at T = 0 in presence

of point-like impurities is obtained within the mode-coupling approximation.

Depending on the value of a dimensionless combination of the model parameters

proportional to the strength of the impurity potential, two different phases

are distinguished, viz. the disordered superfluid and insulator (Bose glass),

separated by an intermediate (quasi)metal state.

\\ ( http://arXiv.org/abs/cond-mat/0611710 , 40kb)

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Paper: cond-mat/0611711

Date: Tue, 28 Nov 2006 12:40:12 GMT (159kb)

Title: Optical conductivity of Bose droplets in quenched disorder at T = 0: the

effects of structure factor

Authors: E.V. Zenkov

Comments: 7 pages, 7 figures

Subj-class: Strongly Correlated Electrons; Statistical Mechanics

\\

The optical response of a system of two-dimensional Bose condensate droplets

with an internal charge structure interacting with impurities is considered

within the mode-coupling theory. It is found, that the glass transition in the

system of droplets occurs at much stronger disorder as compared to the case of

stuctureless point particles. The optical conductivity of the system is found

to exhibit a complex oscillating structure, intimately related to the charge

distribution within the droplets. The application of the model to the problem

of the far IR optical conductivity of doped cuprates (in particular, La214) is

discussed.

\\ ( http://arXiv.org/abs/cond-mat/0611711 , 159kb)

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Paper: physics/0611280

Date: Tue, 28 Nov 2006 20:17:25 GMT (104kb)

Title: Dipole-dipole instability of atom clouds in a far-detuned optical dipole

trap

Authors: D. Nagy and P. Domokos

Comments: 8 pages, 4 figures

Subj-class: Atomic Physics; Optics

\\

The effect of the dipole-dipole interaction on the far-off-resonance optical

dipole trapping scheme is calculated by a mean-field approach. The trapping

laser field polarizes the atoms and the accompanying dipole-dipole energy shift

deepens the attractive potential minimum in a pancake-shaped cloud. At high

density the thermal motion cannot stabilize the gas against self-contraction

and an instability occurs. We calculate the boundary of the stable and unstable

equilibrium regions on a two-dimensional phase diagram of the atom number and

the ratio of the trap depth to the temperature.

\\ ( http://arXiv.org/abs/physics/0611280 , 104kb)

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Paper: cond-mat/0611725

Date: Tue, 28 Nov 2006 21:00:07 GMT (182kb)

Title: Supersolid of Hardcore Bosons on the Face Centered Cubic Lattice

Authors: Takahumi Suzuki and Naoki Kawashima

Comments: 4pages, 5figures

Subj-class: Superconductivity

\\

We investigate a supersolid state in hardcore boson models on the

face-centered-cubic (FCC) lattice. The supersolid state is characterized by a

coexistence of crystalline order and superfluidity. Using a quantum Monte Carlo

method based on the directed-loop algorithm, we calculate static structure

factors and superfluid density at finite temperature, from which we obtain the

phase diagram. The supersolid phase exists at intermediate fillings between a

three-quarter-filled solid phase and a half-filled solid phase. We also discuss

the mechanism of the supersolid state on the FCC lattice.

\\ ( http://arXiv.org/abs/cond-mat/0611725 , 182kb)

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Paper: cond-mat/0611734

Date: Wed, 29 Nov 2006 08:52:24 GMT (253kb)

Title: Irregular Spin Tunnelling for Spin-1 Bose-Einstein Condensates in a

Sweeping Magnetic Field

Authors: Guan-Fang Wang, Li-Bin Fu and Jie Liu

Comments: 8 pages, 15 figures

Subj-class: Mesoscopic Systems and Quantum Hall Effect

\\

We investigate the spin tunnelling of spin-1 Bose-Einstein condensates in a

linearly sweeping magnetic field with a mean-field treatment. We focus on the

two typical alkali Bose atoms $^{87}Rb$ and $^{23}Na$ condensates and study

their tunnelling dynamics according to different sweeping rates of external

magnetic fields. In the adiabatic (i.e., slowly sweeping) and sudden (i.e.,

fast sweeping) limits, no tunnelling is observed. For the case of moderate

sweeping rates, the tunnelling dynamics is found to be very sensitive on the

sweeping rates with showing a chaotic-like tunnelling regime. With magnifying

the regime, however, we find interestedly that the plottings become resolvable

under a resolution of $10^{-4}$ G/s where the tunnelling probability with

respect to the sweeping rate shows a regular periodic-like pattern. Moreover, a

conserved quantity standing for the magnetization in experiments is found can

dramatically affect the above picture of the spin tunnelling. Theoretically we

have given a reasonable interpretation to the above findings and hope our

studies would bring more attention to spin tunnelling experimentally.

\\ ( http://arXiv.org/abs/cond-mat/0611734 , 253kb)

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Paper: cond-mat/0611740

Date: Wed, 29 Nov 2006 11:19:34 GMT (384kb)

Title: Josephson probe of Fulde-Ferrell-Larkin-Ovchinnikov phases in atomic

Fermi gases

Authors: Hui Hu & Xia-Ji Liu

Comments: 5 pages, 4 figures

Subj-class: Superconductivity; Strongly Correlated Electrons

\\

We study two spatially separate one-dimensional atomic Fermi gases in a

double-well trap. A Josephson junction between a

Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid and a

Bardeen-Cooper-Schrieffer superfluid could be realized by creating a weak link

at a given position and by tuning independently the spin polarization of gases

in each well. Owing to the proportionality between the Josephson current and

order parameters, the spatial inhomogeneity of the FFLO order parameter can be

directly revealed through current measurement at different positions of the

link. Thus, the Josephson effect provides definitive evidence for the existence

of FFLO phases.

\\ ( http://arXiv.org/abs/cond-mat/0611740 , 384kb)

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Paper: cond-mat/0611758

Date: Wed, 29 Nov 2006 20:48:12 GMT (954kb)

Title: Negative Echo in the Density Evolution of Ultracold Fermionic Gases

Authors: F. Fumarola, Y. Ahmadian, I.L. Aleiner and B.L. Altshuler

Comments: 4 pages, 2 figures

Subj-class: Superconductivity

\\

We predict a nonequilibrium critical phenomenon in the space-time density

evolution of a fermionic gas above the temperature of transition into the

superfluid phase. On the BCS side of the BEC-BCS crossover, the evolution of a

localized density disturbance exhibits a negative echo at the point of the

initial inhomogeneity. Approaching the BEC side, this effect competes with the

slow spreading of the density of bosonic molecules. However, even here the echo

dominates for large enough times. This effect may be used as an experimental

tool to locate the position of the transition.

\\ ( http://arXiv.org/abs/cond-mat/0611758 , 954kb)

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Paper: physics/0611284

Date: Wed, 29 Nov 2006 08:24:27 GMT (119kb)

Title: Using time dependent citation rates (sales curves) for comparing

scientific impacts

Authors: Werner Marx, Hermann Schier, Ole Krogh Andersen

Comments: 9 pages, 3 figures, 1 table

Subj-class: Physics and Society

\\

As a simple means for comparing and - if possible - predicting scientific

impacts of different researchers working in the same field, we suggest

comparing their "sales curves". A sales curve is the number of citations of the

researcher's papers per year, the citation rate, considered as a function of

time. As examples, we present the citation histories of 10 older well-cited

scientists working in the same field. The sales curve is found to be highly

individual, that is, there is a large variation between different scientists'

sales curves. For each well-cited scientist, however, the sales curve is

steadily increasing as long as he is young and active, and its slope, the

citation acceleration, contains the essential information about his impact. The

slope averaged over the time of activity of the scientist is roughly

independent of time and is a fairly age-independent measure of his scientific

impact. In physics and chemistry, well-cited active scientists have

time-averaged citation accelerations at the order of 10 citations per year^2 or

more. The normal citation acceleration is an order of magnitude smaller. We

also show the sales curves for three large research institutes whose sizes have

been fairly constant over the last 35 years. These sales curves are quite

linear and have slopes at the order of 1 citation per scientist per year^2.

\\ ( http://arXiv.org/abs/physics/0611284 , 119kb)

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Paper: cond-mat/0611769

Date: Thu, 30 Nov 2006 13:55:46 GMT (92kb)

Title: Effective Range Corrections to Three-Body Recombination for Atoms with

Large Scattering Length

Authors: H.-W. Hammer, Timo A. Lahde, L. Platter

Comments: 6 pages, 2 figures

Report-no: HISKP-TH-06/38, NT_at_UW-06-29

Subj-class: Other

\\

Few-body systems with large scattering length a have universal properties

that do not depend on the details of their interactions at short distances. The

rate constant for three-body recombination of bosonic atoms of mass m into a

shallow dimer scales as \hbar a^4/m times a log-periodic function of the

scattering length. We calculate the leading and subleading corrections to the

rate constant which are due to the effective range of the atoms and study the

correlation between the rate constant and the atom-dimer scattering length. Our

results are applied to 4He atoms as a test case.

\\ ( http://arXiv.org/abs/cond-mat/0611769 , 92kb)

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Paper: physics/0611302

Date: Thu, 30 Nov 2006 18:17:44 GMT (200kb)

Title: Controllable 3D atomic Brownian motor in optical lattices

Authors: Claude M. Dion, Peder Sjolund, Stefan J. H. Petra, Svante Jonsell,

Mats Nylen, Laurent Sanchez-Palencia, and Anders Kastberg

Comments: 7 pages, 4 figures. Presented at the conference "Theoretical and

Experimental Foundations of Recent Quantum Technologies" (Durban, South

Africa)

Subj-class: Atomic Physics

\\

We study a Brownian motor, based on cold atoms in optical lattices, where

atomic motion can be induced in a controlled manner in an arbitrary direction,

by rectification of isotropic random fluctuations. In contrast with ratchet

mechanisms, our Brownian motor operates in a potential that is spatially and

temporally symmetric, in apparent contradiction to the Curie principle.

Simulations, based on the Fokker-Planck equation, allow us to gain knowledge on

the qualitative behaviour of our Brownian motor. Studies of Brownian motors,

and in particular ones with unique control properties, are of fundamental

interest because of the role they play in protein motors and their potential

applications in nanotechnology. In particular, our system opens the way to the

study of quantum Brownian motors.

\\ ( http://arXiv.org/abs/physics/0611302 , 200kb)

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Paper: cond-mat/0604424

replaced with revised version Fri, 24 Nov 2006 15:17:48 GMT (242kb)

Title: Non-BCS superfluidity in trapped ultracold Fermi gases

Authors: L. M. Jensen, J. Kinnunen, and P. Torma

Comments: Thoroughly revised

Subj-class: Strongly Correlated Electrons; Other

\\ ( http://arXiv.org/abs/cond-mat/0604424 , 242kb)

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Paper: cond-mat/0606330

replaced with revised version Thu, 23 Nov 2006 09:59:32 GMT (623kb)

Title: Sarma Phase in Trapped Unbalanced Fermi Gases

Authors: K. B. Gubbels, M. W. J. Romans, and H. T. C. Stoof

Comments: Replaced with published version; 4 pages, 3 figures

Subj-class: Statistical Mechanics

Journal-ref: Phys. Rev. Lett. 97, 210402 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0606330 , 623kb)

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Paper: cond-mat/0610675

replaced with revised version Thu, 23 Nov 2006 08:33:01 GMT (244kb)

Title: Exact treatment of trapped imbalanced fermions in the BEC limit

Authors: P. Pieri, G.C. Strinati

Comments: 18 pages, 10 figures, Proceedings of the International School of

Physics "Enrico Fermi" - Course CLXIV "Ultra-Cold Fermi Gases", Varenna, June

2006; added references

Subj-class: Superconductivity; Other

\\ ( http://arXiv.org/abs/cond-mat/0610675 , 244kb)

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Paper: quant-ph/0609236

replaced with revised version Thu, 23 Nov 2006 20:23:21 GMT (263kb)

Title: A fast and robust approach to long-distance quantum communication with

atomic ensembles

Authors: L. Jiang, J. M. Taylor, M. D. Lukin

Comments: 6 pages, 4 figures, 3 tables

\\ ( http://arXiv.org/abs/quant-ph/0609236 , 263kb)

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Paper: quant-ph/0610071

replaced with revised version Thu, 23 Nov 2006 14:22:54 GMT (272kb)

Title: Diffraction limited optics for single atom manipulation

Authors: Y.R.P. Sortais, H. Marion, C. Tuchendler, A.M. Lance, M. Lamare, P.

Fournet, C. Armellin, R. Mercier, G. Messin, A. Browaeys and P. Grangier

Comments: 8 pages, 9 figures; typos corrected and references added

\\ ( http://arXiv.org/abs/quant-ph/0610071 , 272kb)

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Paper: physics/0605028

replaced with revised version Fri, 24 Nov 2006 07:05:34 GMT (281kb)

Title: Effect of Magnetization Inhomogeneity on Magnetic Microtraps for Atoms

Authors: S. Whitlock, B. V. Hall, T. Roach, R. Anderson, P. Hannaford and A. I.

Sidorov

Comments: 4 pages, 4 figures

Subj-class: Atomic Physics

\\ ( http://arXiv.org/abs/physics/0605028 , 281kb)

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Paper: cond-mat/0511080

replaced with revised version Sat, 25 Nov 2006 15:08:09 GMT (459kb)

Title: Probing number squeezing of ultracold atoms across the superfluid-Mott

insulator transition

Authors: Fabrice Gerbier, Simon Foelling, Artur Widera, Olaf Mandel, Immanuel

Bloch

Comments: 4 pages; 4 figures

Subj-class: Other

Journal-ref: Phys. Rev. Lett. 96, 090401 (2006)

\\ ( http://arXiv.org/abs/cond-mat/0511080 , 459kb)

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Paper: cond-mat/0611171

replaced with revised version Mon, 27 Nov 2006 06:37:12 GMT (19kb)

Title: Symmetry and inert states of spin Bose Condensates

Authors: S.-K. Yip

Comments: an error in Sec III C corrected

Subj-class: Superconductivity

\\ ( http://arXiv.org/abs/cond-mat/0611171 , 19kb)

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Paper: quant-ph/0611093

replaced with revised version Mon, 27 Nov 2006 15:32:38 GMT (642kb)

Title: Quantum processing photonic states in optical lattices

Authors: Christine A. Muschik, Ines de Vega, Diego Porras, J. Ignacio Cirac

\\ ( http://arXiv.org/abs/quant-ph/0611093 , 642kb)

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Paper: cond-mat/0610644

replaced with revised version Tue, 28 Nov 2006 00:49:00 GMT (175kb)

Title: Non-diffusive phase spreading of a Bose-Einstein condensate at finite

temperature

Authors: Alice Sinatra (LKB - Lhomond), Yvan Castin (LKB - Lhomond), Emilia

Witkowska

Comments: 14 pages, 7 figures

Proxy: ccsd hal-00109021

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0610644 , 175kb)

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Paper: cond-mat/0611386

replaced with revised version Tue, 28 Nov 2006 17:38:35 GMT (41kb)

Title: Topological defects, "magnetic charges" and coherence in dipolar

excitonic condensates

Authors: Egor Babaev

Comments: v2: important references added

Subj-class: Superconductivity; Mesoscopic Systems and Quantum Hall Effect

\\ ( http://arXiv.org/abs/cond-mat/0611386 , 41kb)

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Paper: cond-mat/0605413

replaced with revised version Wed, 29 Nov 2006 10:22:41 GMT (26kb)

Title: Collective mode damping and viscosity in a 1D unitary Fermi gas

Authors: M. Punk, W. Zwerger

Comments: 9 pages, 3 figures, published version (minor changes)

Subj-class: Statistical Mechanics; Superconductivity

Journal-ref: New J. Phys. 8 (2006) 168

\\ ( http://arXiv.org/abs/cond-mat/0605413 , 26kb)

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Paper: cond-mat/0609036

replaced with revised version Wed, 29 Nov 2006 09:07:09 GMT (148kb)

Title: Smoothing effect and delocalization of interacting Bose-Einstein

condensates in random potentials

Authors: Laurent Sanchez-Palencia (LCFIO)

Comments: To appear in Phys. Rev. A; The word "screening" has been changed to

"smoothing" to avoid confusions with other effects discussed in the

literature. This does not affect the content of paper, nor the results, nor

the physical discussion

Proxy: ccsd ccsd-00090760

Subj-class: Other

\\ ( http://arXiv.org/abs/cond-mat/0609036 , 148kb)

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Next week may be a little late: till then,

Matt.

-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Fri Dec 01 2006 - 18:01:43 EST

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