Elastic constants from microscopic strain fluctuationsFluctuations of the instantaneous local Lagrangian strain εij(r,t), measured with respect to a static ``reference'' lattice, are used to obtain accurate estimates of the elastic…Surajit Sengupta, Peter Nielaba, Madan Rao et al.·Jun 4, 1999SaveLearn
Atomic Scale Sliding and Rolling of Carbon NanotubesA carbon nanotube is an ideal object for understanding the atomic scale aspects of interface interaction and friction. Using molecular statics and dynamics methods different types of motion of…A. Buldum, Jian Ping Lu·Jun 4, 1999SaveLearn
Pdf's of Derivatives and Increments for Decaying Burgers TurbulenceA Lagrangian method is used to show that the power-law with a -7/2 exponent in the negative tail of the pdf of the velocity gradient and of velocity increments, predicted by E, Khanin, Mazel and…J. Bec, U. Frisch·Jun 3, 1999SaveLearn
Excitation of phonons in a Bose-Einstein condensate by light scatteringStimulated small-angle light scattering was used to measure the structure factor of a Bose-Einstein condensate in the phonon regime. The excitation strength for phonons was found to be significantly…D. M. Stamper-Kurn, A. P. Chikkatur, A. Görlitz et al.·Jun 3, 1999SaveLearn
Scale-invariance and contingent claim pricingPrices of tradables can only be expressed relative to each other at any instant of time. This fundamental fact should therefore also hold for contigent claims, i.e. tradable instruments, whose prices…Jiri Hoogland, Dimitri Neumann·Jun 3, 1999SaveLearn
Coherence properties of an atom laserWe study the coherence properties of an atom laser, which operates by extracting atoms from a gaseous Bose-Einstein condensate via a two-photon Raman process, by analyzing a recent experiment. We…M. Trippenbach, Y. B. Band, M. Edwards et al.·Jun 2, 1999SaveLearn
Predicting phase transition pressure in solids: a semiclassical possibilityThis is a short review of the physical ideas,algorithm for calculations and some results of a semiclassical theory of the behaviour of materials under high pressure,proposed by P.Savic and…V. Celebonovic·Jun 2, 1999SaveLearn
Electromigration-Induced Flow of Islands and Voids on the Cu(001) SurfaceElectromigration-induced flow of islands and voids on the Cu(001) surface is studied at the atomic scale. The basic drift mechanisms are identified using a complete set of energy barriers for adatom…Hanoch Mehl, Ofer Biham, Oded Millo et al.·May 30, 1999SaveLearn
Theory of superradiant scattering of laser light from Bose-Einstein condensatesIn a recent MIT experiment, a new form of superradiant Rayleigh scattering was observed in Bose-Einstein condensates. We present a detailed theory of this phenomena in which the directional…M. G. Moore, P. Meystre·May 28, 1999SaveLearn
Lyapunov Potential Description for Laser DynamicsWe describe the dynamical behavior of both class A and class B lasers in terms of a Lyapunov potential. For class A lasers we use the potential to analyze both deterministic and stochastic dynamics.…Catalina Mayol, Raul Toral, Claudio R. Mirasso·May 28, 1999SaveLearn
Born Effective Charge Reversal and Metallic Threshold State at a Band Insulator-Mott Insulator TransitionWe study the quantum phase transition between a band (``ionic'') insulator and a Mott-Hubbard insulator, realized at a critical value U=Uc in a bipartite Hubbard model with two inequivalent…N. Gidopoulos S. Sorella, E. Tosatti·May 28, 1999SaveLearn
Universality of vortex avalanches in a type II superconductor with periodic pinningIn this work the robustness of a simple cellular automaton developed by Bassler and Paczuski to describe the critical state in type-II superconductors is studied. Two different configurations of…R. Cruz, R. Mulet, E. Altshuler·May 28, 1999SaveLearn
Theory of Financial Risk: Basic notions in probabilityRisk control has become one of the major concern of financial institutions. The need for adequate statistical tools to measure and anticipate the amplitude of the potential moves of financial markets…Jean-Philippe Bouchaud, Marc Potters·May 27, 1999SaveLearn
Noise-Induced Phase Separation: Mean-Field ResultsWe present a study of a phase-separation process induced by the presence of spatially-correlated multiplicative noise. We develop a mean-field approach suitable for conserved-order-parameter systems…M. Ibanes, J. Garcia-Ojalvo, R. Toral et al.·May 27, 1999SaveLearn
Interference of Bose-Einstein condensates in momentum spaceWe suggest an experiment to investigate the linear superposition of two spatially separated Bose-Einstein condensates. Due to the coherent combination of the two wave functions, the dynamic structure…L. Pitaevskii, S. Stringari·May 27, 1999SaveLearn
The Dynamics of Structural Transitions in Sodium Chloride ClustersIn recent experiments on sodium chloride clusters structural transitions between nanocrystals with different cuboidal shapes were detected. Here we presents results for the thermodynamics and…Jonathan Doye, David Wales·May 27, 1999SaveLearn
Entropy Revisited: the Plausible Role of GravitationWe first present open questions related to the foundations of thermodynamics and statistical physics. We then argue that in principle one can not have "closed systems", and that a universal…Eshel Ben-Jacob, Ziv Hermon, Alexsander Shnirman·May 27, 1999SaveLearn
Strong-Coupling Calculation of Fluctuation Pressure of a Membrane Between WallsWe calculate analytically the proportionality constant in the pressure law of a membrane between parallel walls from the strong-coupling limit of variational perturbation theory up to third order.…M. Bachmann, H. Kleinert, A. Pelster·May 27, 1999SaveLearn
Noise induced transition from an absorbing phase to a regime of stochastic spatiotemporal intermittencyWe introduce a stochastic partial differential equation capable of reproducing the main features of spatiotemporal intermittency (STI). Additionally the model displays a noise induced transition from…M. G. Zimmermann, R. Toral, O. Piro et al.·May 26, 1999SaveLearn
Dynamics of the diluted Ising antiferromagnet Fe0.31Zn0.69F2The diluted Ising antiferromagnet, Fe0.31Zn0.69F2, has been investigated by dynamic susceptibility measurements in zero and and finite applied dc-fields. In zero field, there is a para- to…K. Jonason, P. Nordblad, F. C. Montenegro·May 26, 1999SaveLearn
A simple method to create a vortex in Bose-Einstein condensate of alkali atomsBose-Einstein condensation in alkali atoms has materialized quite an interesting system, namely a condensate with a spin degree of freedom. In analogy with the A-phase of the superfluid 3He,…Mikio Nakahara, Tomoya Isoshima, Kazushige Machida et al.·May 26, 1999SaveLearn
Models for adatom diffusion on fcc(001) metal surfacesWe present a class of models that describe self diffusion on several fcc(001) metal substrates within a common framework. The models are found to apply well for Cu(001), Ag(001), Au(001), Ni(001) and…H. Mehl, I. Furman, O. Biham et al.·May 25, 1999SaveLearn
Coexistence of Single and Double-Quantum Vortex LinesWe discuss the configurations in which singly and doubly quantized vortex lines may coexist in a rotating superfluid. General principles of energy minimization lead to the conclusion that in…Ü. Parts, V. V. Avilov, J. H. Koivuniemi et al.·May 25, 1999SaveLearn
Supression of magnetic subbands in semiconductor superlattices driven by a laser fieldThe effect of strong laser radiation on magnetic subbands in semiconductor superlattices is investigated. Due to the presence of a magnetic field perpendicular to the growth direction, non-linear…C. Rodríguez-Castellanos, M. T. Pérez-Maldonado·May 25, 1999SaveLearn
Quantum stochastic processes in mesoscopic conductorsWe show an equivalence between the approach of Buttiker and the Fermi quantum stochastic calculus for mesoscopic systems. To illustrate the method we derive the current fluctuations in a two terminal…G. J. Milburn·May 25, 1999SaveLearn