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Condensed Matter papers — page 56

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Dynamic transition and resonance in current-driven arrays of Josephson junctions
We consider a two-dimensional fully frustrated Josephson-junction array, which is driven uniformly by oscillating currents. As the temperature is lowered, there emerges a dynamic phase transition to…
Gun Sang Jeon, Jong Soo Lim, Hyun Jin Kim et al.Jun 23, 2002
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A Dynamical Approach to Glassy Materials
Typical properties of glassy materials are shown to be captured by a mean-field free-volume theory. Relaxation processes are supposed to be free-volume activated, and different entropy barriers are…
Anaël LemaîtreJun 22, 2002
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Multiple bound states in scissor-shaped waveguides
We study bound states of the two-dimensional Helmholtz equations with Dirichlet boundary conditions in an open geometry given by two straight leads of the same width which cross at an angle θ. Such…
Evgeny N. Bulgakov, Pavel Exner, Konstantin N. Pichugin et al.Jun 21, 2002
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Temperature and Field Dependence of the Mobility in Liquid-Crystalline Conjugated Polymer Films
The transport properties of organic light-emitting diodes in which the emissive layer is composed of conjugated polymers in the liquid-crystalline phase have been investigated. We have performed…
S. J. Martin, A. Kambili, A. B. WalkerJun 20, 2002
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Capital Redistribution Brings Wealth by Parrondo's Paradox
We present new versions of the Parrondo's paradox by which a losing game can be turned into winning by including a mechanism that allows redistribution of the capital amongst an ensemble of…
Raul ToralJun 20, 2002
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Reply to Johansen's comment
This is a reply to Johansen's comment on `Are Financial Crashes Predictable?', by L. Laloux, M. Potters, R. Cont, J.P. Aguilar, J.P. Bouchaud, Europhys. Lett. 45, p. 1 (1999).
Laurent Laloux, Marc Potters, Jean-Pierre Aguilar et al.Jun 19, 2002
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The skewed multifractal random walk with applications to option smiles
We generalize the construction of the multifractal random walk (MRW) due to Bacry, Delour and Muzy to take into account the asymmetric character of the financial returns. We show how one can include…
B. Pochart, J. -P. BouchaudJun 19, 2002
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Multicanonical Simulations Step by Step
The purpose of this article is to provide a starter kit for multicanonical simulations in statistical physics. Fortran code for the q-state Potts model in d=2, 3,... dimensions can be downloaded…
Bernd A. BergJun 18, 2002
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Statistical Derivation of the Evolution Equation of Liquid Water Path Fluctuations in Clouds
How to distinguish and quantify deterministic and random influences on the statistics of turbulence data in meteorology cases is discussed from first principles. Liquid water path (LWP) changes in…
K. Ivanova, M. AusloosJun 18, 2002
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The superfluidity mechanism of He II
Based on a first principles treatment of the excitation states we show that superfluidity of superfluid 4He (He II) results from a reduction in the number of phonon wavevector K states 2(K)…
J. X. Zheng-Johansson, B. Johansson, P-I. JohanssonJun 18, 2002
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Statistical properties of stock order books: empirical results and models
We investigate several statistical properties of the order book of three liquid stocks of the Paris Bourse. The results are to a large degree independent of the stock studied. The most interesting…
J. -P. Bouchaud, M. Mezard, M. PottersJun 18, 2002
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Weakly bound atomic trimers in ultracold traps
The experimental three-atom recombination coefficients of the atomic states 23Na|F=1,mF=-1>, 87Rb|F=1,mF=-1> and 85Rb|F=2,mF=-2>, together with the corresponding two-body…
M. T. Yamashita, T. Frederico, Lauro Tomio et al.Jun 17, 2002
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Bose-Einstein condensates in strong electric fields -- effective gauge potentials and rotating states
Magnetically-trapped atoms in Bose-Einstein condensates are spin polarized. Since the magnetic field is inhomogeneous, the atoms aquire Berry phases of the Aharonov-Bohm type during adiabatic motion.…
J. M. Kailasvuori, T. H. Hansson, G. M. KavoulakisJun 17, 2002
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Excited states dynamics in time-dependent density functional theory: high-field molecular dissociation and harmonic generation
We present a theoretical description of femtosecond laser induced dynamics of the hydrogen molecule and of singly ionised sodium dimers, based on a real-space, real-time, implementation of…
Alberto Castro, M. A. L. Marques, Julio A. Alonso et al.Jun 17, 2002
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Photon statistics and dynamics of Fluorescence Resonance Energy Transfer
We report high time-resolution measurements of photon statistics from pairs of dye molecules coupled by fluorescence resonance energy transfer (FRET). In addition to quantum-optical photon…
Andrew J. Berglund, Andrew C. Doherty, Hideo MabuchiJun 16, 2002
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The range of the contact interactions and the kinetics of the Go models of proteins
We consider two types of Go models of a protein (crambin) and study their kinetics through molecular dynamics simulations. In the first model, the residue -- residue contact interactions are selected…
Marek Cieplak, Trinh Xuan HoangJun 16, 2002
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The power of patience: A behavioral regularity in limit order placement
In this paper we demonstrate a striking regularity in the way people place limit orders in financial markets, using a data set consisting of roughly seven million orders from the London Stock…
Ilija I. Zovko, J. Doyne FarmerJun 14, 2002
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Polariton dynamics and Bose-Einstein condensation in semiconductor microcavities
We present a theoretical model that allows us to describe the polariton dynamics in a semiconductor microcavity at large densities, for the case of non-resonant excitation. Exciton-polariton…
D. Porras, C. Ciuti, J. J. Baumberg et al.Jun 14, 2002
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Breakdown of superfluidity of an atom laser past an obstacle
The 1D flow of a continuous beam of Bose-Einstein condensed atoms in the presence of an obstacle is studied as a function of the beam velocity and of the type of perturbing potential (representing…
Nicolas PavloffJun 14, 2002
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The spectral dimension of random trees
We present a simple yet rigorous approach to the determination of the spectral dimension of random trees, based on the study of the massless limit of the Gaussian model on such trees. As a byproduct,…
C. Destri, L. DonettiJun 13, 2002
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Efimov States in a Bose-Einstein Condensate near a Feshbach Resonance
Recent experiments with Bose-Einstein condensates of 85Rb atoms near a Feshbach resonance have produced evidence for a condensate of diatomic molecules coexisting with the atom condensate. It should…
Eric Braaten, H. -W. Hammer, M. KusunokiJun 13, 2002
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Onset of the nonlinear dielectric response of glasses in the two-level system model
We have calculated the real part χ' of the nonlinear dielectric susceptibility of amorphous insulators in the kHz range, by using the two-level system model and a nonperturbative numerical…
J. Le Cochec, F. LadieuJun 13, 2002
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Two-Dimensional Weakly Interacting Bose Gas in the Fluctuation Region
We study the crossover between the mean-field and critical behavior of the two-dimensional Bose gas throughout the fluctuation region of the Berezinskii--Kosterlitz--Thouless phase transition point.…
Nikolay Prokof'ev, Boris SvistunovJun 13, 2002
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Bubbles, crashes and intermittency in agent based market models
We define and study a rather complex market model, inspired from the Santa Fe artificial market and the Minority Game. Agents have different strategies among which they can choose, according to their…
Irene Giardina, Jean-Philippe BouchaudJun 13, 2002
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An analytic model of the Gruneisen parameter at all densities
We model the density dependence of the Gruneisen parameter as gamma(rho) = 1/2 + gamma1/rho1/3 + gamma2/rhoq, where gamma1, gamma2, and q>1 are constants. This form is based on the…
L. Burakovsky, D. L. PrestonJun 11, 2002
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