Scaling properties of scale-free evolving networks: Continuous approachScaling behavior of scale-free evolving networks arising in communications, citations, collaborations, etc. areas is studied. We derive universal scaling relations describing properties of such…S. N. Dorogovtsev, J. F. F. Mendes·Dec 1, 2000SaveLearn
Magneto infra-red absorption in high electronic density GaAs quantum wellsMagneto infra-red absorption measurements have been performed in a highly doped GaAs quantum well which has been lifted off and bonded to a silicon substrate, in order to study the resonant polaron…A. J. L. Poulter, J. Zeman, D. K. Maude et al.·Dec 1, 2000SaveLearn
Exchange Field Induced Magnetoresistance in Colossal Magnetoresistance ManganitesThe effect of an exchange field on electrical transport in thin films of metallic ferromagnetic manganites has been investigated. The exchange field was induced both by direct exchange coupling in a…I. N. Krivorotov, K. R. Nikolaev, A. Yu. Dobin et al.·Nov 30, 2000SaveLearn
Harmonics generation in electron-ion collisions in a short laser pulseAnomalously high generation efficiency of coherent higher field-harmonics in collisions between oppositely charged particles in the field of femtosecond lasers is predicted. This is based on…H. Haberland, M. Bonitz, D. Kremp·Nov 30, 2000SaveLearn
Random matrix theory for systems with an approximate symmetry and widths of acoustic resonances in thin chaotic platesWe discuss a random matrix model of systems with an approximate symmetry and present the spectral fluctuation statistics and eigenvector characteristics for the model. An acoustic resonator like,…A. Andersen, C. Ellegaard, A. D. Jackson et al.·Nov 30, 2000SaveLearn
Dissipationless Spin Transport in Thin Film FerromagnetsMetallic thin film ferromagnets generically possess spiral states that carry dissipationless spin currents. We relate the critical values of these supercurrents to micromagnetic material parameters,…Jürgen König, Martin Chr. Bønsager, Allan H. MacDonald·Nov 29, 2000SaveLearn
Level and Eigenfunction Statistics in Billiards with Surface ScatteringStatistical properties of billiards with diffusive boundary scattering are investigated by means of the supersymmetric sigma-model in a formulation appropriate for chaotic ballistic systems. We study…Ya. M. Blanter, A. D. Mirlin, B. A. Muzykantskii·Nov 29, 2000SaveLearn
Direct observation of growth and collapse of a Bose-Einstein condensate with attractive interactionsThe dynamical behavior of Bose-Einstein condensation (BEC) in a gas with attractive interactions is striking. Quantum theory predicts that BEC of a spatially homogeneous gas with attractive…Jordan M. Gerton, Dmitry Strekalov, Ionut Prodan et al.·Nov 29, 2000SaveLearn
Option Pricing and Hedging with Temporal CorrelationsWe consider the problem of option pricing and hedging when stock returns are correlated in time. Within a quadratic-risk minimisation scheme, we obtain a general formula, valid for weakly correlated…Lorenzo Cornalba, Jean-Philippe Bouchaud, Marc Potters·Nov 29, 2000SaveLearn
Master Equation for Electromagnetic Dissipation and Decoherence of Density MatrixWe set up a forward--backward path integral for a point particle in a bath of photons to derive a master equation for the density matrix which describes electromagnetic dissipation and decoherence.…Z. Haba, H. Kleinert·Nov 29, 2000SaveLearn
Hall effect in the cuprates: the role of forward scattering on impuritiesWe solve the Boltzmann equation for electrons moving in a two-dimensional plane of square symmetry in the presence of a transverse magnetic field. We assume that there are two sources of scattering:…R. Hlubina·Nov 29, 2000SaveLearn
Acoustic radiation in randomly-layered structuresRadiation from acoustic sources located inside randomly-layered structures is studied using the transfer matrix method. It is shown that in contrast to the periodically layered cases where the…Zhen Ye, Pi-Gang Luan·Nov 29, 2000SaveLearn
Skyrmions in a ferromagnetic Bose-Einstein condensateThe recently realized multicomponent Bose-Einstein condensates provide opportunities to explore the rich physics brought about by the spin degrees of freedom. For instance, we can study spin waves…U. Al Khawaja, H. T. C. Stoof·Nov 28, 2000SaveLearn
Quantum carpet interferometry for trapped atomic Bose-Einstein condensatesWe propose an ``interferometric'' scheme for Bose-Einstein condensates using near-field diffraction. The scheme is based on the phenomenon of intermode traces or quantum carpets; we show how…S. Choi, K. Burnett, O. M. Friesch et al.·Nov 28, 2000SaveLearn
Refinement of Bethe ansatz string and its alternativeThe well known string solution to Bethe ansatz equations is shown to be inconsistent in its widely accepted form. A valid refinement demanding higher order corrections in subsequent roots is…Anjan Kundu·Nov 28, 2000SaveLearn
Entropic effects on the Size Evolution of Cluster StructureWe show that the vibrational entropy can play a crucial role in determining the equilibrium structure of clusters by constructing structural phase diagrams showing how the structure depends upon both…Jonathan Doye, Florent Calvo·Nov 28, 2000SaveLearn
Magnetic Field Effect for Two Electrons in a Two Dimensional Random PotentialWe study the problem of two particles with Coulomb repulsion in a two-dimensional disordered potential in the presence of a magnetic field. For the regime, when without interaction all states are…Giuliano Benenti, Dima L. Shepelyansky·Nov 28, 2000SaveLearn
Simulations of Bose fields at finite temperatureWe introduce a time-dependent projected Gross-Pitaevskii equation to describe a partially condensed homogeneous Bose gas, and find that this equation will evolve randomised initial wave functions to…M. J. Davis, S. A. Morgan, K. Burnett·Nov 27, 2000SaveLearn
Boundary Critical Phenomena in SU(3) "Spin" ChainsSU(3)-invariant "spin" chains with a single impurity, such as a modified exchange coupling on one link, are analyzed using boundary conformal field theory techniques. These chains are…Ian Affleck, Masaki Oshikawa, Hubert Saleur·Nov 27, 2000SaveLearn
Comparison of structural transformations and superconductivity in compressed Sulfur and SeleniumDensity-functional calculations are presented for high-pressure structural phases of S and Se. The structural phase diagrams, phonon spectra, electron-phonon coupling, and superconducting properties…Sven P. Rudin, Amy Y. Liu, J. K. Freericks et al.·Nov 27, 2000SaveLearn
Sandpiles and absorbing-state phase transitions: recent results and open problemsWe review some recent results on the relations between sandpiles and a class of absorbing state phase transitions. We use the concept of fixed energy sandpiles (FES), in which external driving and…Miguel A. Munoz, Ronald Dickman, Romualdo Pastor-Satorras et al.·Nov 27, 2000SaveLearn
Memory Effect in Silicon Nitride in Silicon DevicesThe dominant dielectric used currently in silicon devices is silicon oxide. Its application for future devices will be impeded by several fundamental limitations which lead to low reliability of…V. A. Gritsenko, Yu. N. Morokov, Yu. N. Novikov et al.·Nov 25, 2000SaveLearn
Relativistic corrections in magnetic systemsWe present a weak-relativistic limit comparison between the Kohn-Sham-Dirac equation and its approximate form containing the exchange coupling, which is used in almost all relativistic codes of…A. Crépieux, P. Bruno·Nov 24, 2000SaveLearn
Analytical Results for Trapped Weakly Interacting Bosons in Two DimensionsWe consider a model of N two-dimensional bosons in a harmonic trap with translational and rotational invariant, weak two-particle interaction. We present in configuration space a systematical…Velimir Bardek, Stjepan Meljanac·Nov 24, 2000SaveLearn
On direction of spontaneous magnetization in a "cubic" ferromagnetThe magnetic properties of anisotropic films have been studied using 3D-neutron polarization analysis. The experimental facts refer to essential distinction of the sample states, magnetized in…A. V. Kovalev, L. A. Akselrod·Nov 24, 2000SaveLearn