Exact solution of the one-dimensional ballistic aggregationAn exact expression for the mass distribution ρ(M,t) of the ballistic aggregation model in one dimension is derived in the long time regime. It is shown that it obeys scaling…L. Frachebourg·Aug 7, 1998SaveLearn
Kinetics of four-wave mixing for a 2D magneto-plasma in strong magnetic fieldsWe investigate the femtosecond kinetics of an optically excited 2D magneto-plasma at intermediate and high densities under a strong magnetic field perpendicular to the quantum well (QW). We assume an…M. W. Wu, H. Haug·Aug 7, 1998SaveLearn
Bethe ansatz for the Harper equation: Solution for a small commensurability parameterThe Harper equation describes an electron on a 2D lattice in magnetic field and a particle on a 1D lattice in a periodic potential, in general, incommensurate with the lattice potential. We find the…I. V. Krasovsky·Aug 6, 1998SaveLearn
Exciton and confinement potential effects on the resonant Raman scattering in quantum dotsResonant Raman scattering in semiconductor quantum dots with spherical shape is theoretically investigated. The Frohlich-like interaction between electronic states and optical vibrations has been…E. Menendez-Proupin, J. L. Pena, C. Trallero-Giner·Aug 6, 1998SaveLearn
Critical Velocity in 3He-B Vibrating Wire Experiments as Analog of Vacuum Instability in a Slowly Oscillating Electric FieldThe Lancaster experiments with a cylindrical wire moving in superfluid 3He-B are discussed, where the measured critical velocity of pair creation is much below the Landau critical velocity. The…A. Calogeracos, G. E. Volovik·Aug 5, 1998SaveLearn
Chaos control in photoconductorsChaos synchronization in one of charge-carrier dynamical systems in photoconductors is studied within both the replica and nonreplica approaches.It has been shown that using the boundedness of the…Shahverdiev E. M·Aug 5, 1998SaveLearn
Two-level Hamiltonian of a superconducting quantum point contactIn a superconducting quantum point contact, dynamics of the superconducting phase is coupled to the transitions between the subgap states. We compute this coupling and derive the two-level…D. A. Ivanov, M. V. Feigel'man·Aug 3, 1998SaveLearn
Non-Monotone Characteristic of Spectral Statistics in the Transition between Poisson and GaussWe have computed the spectral number variances of an extended random matrix ensemble predicted by Guhr's supersymmetry formula, showing a non-monotone increase of the curves that arises from an…Hiroshi Hasegawa, Baowen Li, Jian-Zhong Ma et al.·Aug 3, 1998SaveLearn
Thermodynamics of Random Ferromagnetic Antiferromagnetic Spin-1/2 ChainsUsing the quantum Monte Carlo Loop algorithm, we calculate the temperature dependence of the uniform susceptibility, the specific heat, the correlation length, the generalized staggered…Beat Frischmuth, Manfred Sigrist, Beat Ammon et al.·Aug 3, 1998SaveLearn
Lattice-dynamical calculation of phonon scattering at a disordered interfaceFor an fcc crystal with central force interactions and separately for a scalar model on a square lattice, we compute exactly the phonon transmission coefficient T(ω) through a disordered planar…G. Fagas, A. G. Kozorezov, C. J. Lambert et al.·Aug 3, 1998SaveLearn
Universal correlations in vibrational spectra of complex crystalsWe study spectral statistics of lattice modes in a disordered crystal and in a crystal with a complex unit cell. The correlations of the eigenmode frequencies of a block of a disordered solid is…G. Fagas, Vladimir I. Fal'ko, C. J. Lambert·Aug 3, 1998SaveLearn
Avalanche mixing of granular solids in a rotating 2D drum: diffusion and fractionalityThe dynamics of the avalanche mixing in a slowly rotated 2D upright drum is studied in the situation where the difference δ between the angle of marginal stability and the angle of repose of the…S. N. Dorogovtsev·Aug 3, 1998SaveLearn
Critical fluctuations in normal-to-superconducting transitionWe study the phase transition to the superconducting state taking into account the fluctuations of the order parameter and of the vector magnetic field and discuss the question of the order of…R. Folk, Yu. Holovatch·Jul 31, 1998SaveLearn
Thermodynamics of glasses: a first principle computationWe propose a first principle computation of the thermodynamics of simple fragile glasses starting from the two body interatomic potential. A replica formulation translates this problem into that of a…Marc Mezard, Giorgio Parisi·Jul 31, 1998SaveLearn
Finite-Temperature Collective Excitation of a Bose-Einstein CondensateWe derive a simple formula for the finite-temperature shifts of the collective excitations of a Bose-Einstein condensate. To test the validity of our treatment we apply it to explain the anomalous…Maxim Olshanii·Jul 31, 1998SaveLearn
Exploring a quantum degenerate gas of fermionic atomsWe predict novel phenomena in the behavior of an ultra- cold, trapped gas of fermionic atoms. We find that quantum statistics radically changes the collisional properties, spatial profile, and…B. DeMarco, D. S. Jin·Jul 30, 1998SaveLearn
Synchronization of Short-Range Pulse-Coupled OscillatorsWe explore systems of pulse-coupled oscillators beyond the mean-field limit [R.E. Mirollo and S.H. Strogatz, SIAM J. Appl. Math. 50, 1645 (1990)] by means of a manageable description which…J. M. G. Vilar, A. Corral·Jul 30, 1998SaveLearn
Critical exponents of the diluted Ising model between dimensions 2 and 4Within the massive field theoretical renormalization group approach the expressions for the beta- and gamma-functions of the anisotropic mn-vector model are obtained for general space dimension d in…Yu. Holovatch, T. Yavors'kii·Jul 30, 1998SaveLearn
Elementary excitations in trapped Bose gases beyond mean field approximationUsing hydrodynamic theory of superfluids and the Lee-Huang-Yang equation of state for interacting Bose gases we derive the first correction to the collective frequencies of a trapped gas, due to…L. Pitaevskii, S. Stringari·Jul 30, 1998SaveLearn
Nonlinear optics of matter wavesWe give a brief overview of the way atomic physics is now developing in a way reminiscent of the optics revolution of the 1960's. Thanks in particular to recent developments in atomic trapping…E. V. Goldstein, M. G. Moore, O. Zobay et al.·Jul 29, 1998SaveLearn
Bosonic clouds with attractive interaction beyond the local interaction approximationWe study the properties of a Bose-Einstein condensed cloud of atoms with negative scattering length confined in a harmonic trap. When a realistic non local (finite range) effective interaction is…L. Reatto, A. Parola, L. Salasnich·Jul 29, 1998SaveLearn
Theory of Boundary Effects in Invasion PercolationWe study the boundary effects in invasion percolation with and without trapping. We find that the presence of boundaries introduces a new set of surface critical exponents, as in the case of standard…A. Gabrielli, R. Cafiero, G. Caldarelli·Jul 28, 1998SaveLearn
Asymptotic Statistics of Poincaré Recurrences in Hamiltonian Systems with Divided Phase SpaceBy different methods we show that for dynamical chaos in the standard map with critical golden curve the Poincaré recurrences P(τ) and correlations C(τ) asymptotically decay in time as P ~ C/τ~…B. V. Chirikov, D. L. Shepelyansky·Jul 28, 1998SaveLearn
Nonergodic Behavior of Interacting Bosons in Harmonic TrapsWe study the time evolution of a system of interacting bosons in a harmonic trap. In the low-energy regime, the quantum system is not ergodic and displays rather large fluctuations of the ground…Thomas Papenbrock, George F. Bertsch·Jul 28, 1998SaveLearn
Electron-Doped Manganese Perovskites: The Polaronic StateUsing the Lanczos method in linear chains we study the ground state of the double exchange model including an antiferromagnetic super-exchange in the low concentration limit. We find that this ground…C. D. Batista, J. M. Eroles, M. Avignon et al.·Jul 27, 1998SaveLearn