Role of Impurities in Core Contribution to Vortex FrictionWe present a microscopic calculation of core states contribution to vortex friction in a type II superconductor at zero temperature. In weak impurity limit, a perturbative calculation leads to a…P. Ao, X. -M. Zhu·Nov 6, 1998SaveLearn
Quantum phase transitions in cuprates: stripes and antiferromagnetic supersolidsAn elementary phenomenological consideration is presented regarding the long wavelength quantum dynamics in cuprate superconductors. The emphasis is on the interplay of the charge- and spin order…J. Zaanen·Nov 5, 1998SaveLearn
Scaling properties of discrete fractalsAn important problem in the analysis of experimental data showing fractal properties, is that such samples are composed by a set of points limited by an upper and a lower cut off. We study how finite…A. Amici, M. Montuori·Nov 5, 1998SaveLearn
Generalized Dielectric Breakdown ModelWe propose a generalized version of the Dielectric Breakdown Model (DBM) for generic breakdown processes. It interpolates between the standard DBM and its analog with quenched disorder, as a…R. Cafiero, A. Gabrielli, M. Marsili et al.·Nov 5, 1998SaveLearn
Modeling the Stock Market prior to large crashesWe propose that the minimal requirements for a model of stock market price fluctuations should comprise time asymmetry, robustness with respect to connectivity between agents, ``bounded…Anders Johansen, Didier Sornette·Nov 5, 1998SaveLearn
Reptation of star polymers in a network: Monte Carlo results of diffusion coefficientsWe report on Monte Carlo results of diffusion coefficients of lattice star polymers trapped inside a fixed network (de Gennes model). It is found that our data are in agreement with the…G. T. Barkema, A. Baumgaertner·Nov 4, 1998SaveLearn
The correction-to-scaling exponent in dilute systemsThe leading correction-to-scaling exponent ω for the three-dimensional dilute Ising model is calculated in the framework of the field theoretic renormalization group approach. Both in the minimal…R. Folk, Yu. Holovatch, T. Yavors'kii·Nov 4, 1998SaveLearn
Myopic BosonizationAs the title suggests, this is an attempt at bosonizing fermions in any number of dimensions without paying attention to the fact that the Fermi surface is an extended object. One is tempted to…Girish S. Setlur·Nov 4, 1998SaveLearn
Fluctuations of addition spectra of independent quantum systemsMotivated by recent experiments on large quantum dots, we consider the energy spectrum in a system consisting of N particles distributed among K<N independent sub-systems, such that the energy of…Yshai Avishai, Dani Berend, Richard Berkovits·Nov 3, 1998SaveLearn
Dynamics of defect formationA dynamic symmetry-breaking transition with noise and inertia is analyzed. Exact solution of the linearized equation that describes the critical region allows precise calculation (exponent and…Esteban Moro, Grant Lythe·Nov 3, 1998SaveLearn
Monte Carlo Quasi-Heatbath by approximate inversionWhen sampling the distribution P(phi) ~ exp(-|A phi|2), a global heatbath normally proceeds by solving the linear system A phi = eta, where eta is a normal Gaussian vector, exactly. This paper shows…Ph. de Forcrand·Nov 2, 1998SaveLearn
Decay of Superflow Confined in Thin Torus: A Realization of Tunneling Quantum FieldsThe quantum nucleation of phase slips in neutral superfluids confined in a thin torus is investigated by means of the collective coordinate method. We have devised, with numerical justification, a…M. Nishida, S. Kurihara·Nov 2, 1998SaveLearn
Dynamics of transverse correlations in the spin-1/2 isotropic XY chain with a correlated Lorentzian disorderUsing a numerical approach we examine the dynamics of zz correlations for the spin-12 isotropic XY chain with random Lorentzian intersite coupling and transverse field at sites that depends…Oleg Derzhko, Taras Krokhmalskii·Nov 2, 1998SaveLearn
Dynamics and thermodynamics of the pseudospin-electron model in the case of absence of the electron Hubbard correlation. I. The analytical considerationDynamics and thermodynamics of the model with local anharmonism in the case of absence of the electron (Hubbard) correlation is investigated in the present work. The correlation functions, mean…I. V. Stasyuk, A. M. Shvaika, K. V. Tabunschyk·Nov 2, 1998SaveLearn
A parity conserving dimer model with infinitely many absorbing statesWe propose and study a model where, for the first time, two aspects are present: parity conservation and infinitely many absorbing states. Whereas steady-state simulations show that the static…M. C. Marques, J. F. F. Mendes·Nov 2, 1998SaveLearn
Finite temperature Drude weight of the one dimensional spin 1/2 Heisenberg modelUsing the Bethe ansatz method, the zero frequency contribution (Drude weight) to the spin current correlations is analyzed for the easy plane antiferromagnetic Heisenberg model. The Drude weight is a…X. Zotos·Nov 2, 1998SaveLearn
Finite temperature excitations of Bose gases in anisotropic trapsThe mode frequencies of a weakly interacting Bose gas in a magnetic trap are studied as a function of the anisotropy of the trap. As in earlier works the generalized Hartree-Fock-Bogoliubov equations…J. Reidl, A. Csordás, R. Graham et al.·Nov 2, 1998SaveLearn
Mean Magnetic Field and Noise Cross-Correlation in Magnetohydrodynamic Turbulence: Results from a One-Dimensional ModelWe show that a recently proposed [J. Fleischer and P.H. Diamond, Phys. Rev. E 58, R2709 (1998)] one-dimensional Burgers-like model for magnetohydrodynamics (MHD) is in effect identical to…Abhik Basu, Jayanta K Bhattacharjee, Sriram Ramaswamy·Nov 2, 1998SaveLearn
Charge screening and magnetic anisotropy in RCo5 compoundsAn analysis of magnetic anisotropy in RCo5 compounds is performed with account of screening of ion point charges by conduction electrons. A crucial role of non-uniform distribution of screening…V. Yu. Irkhin, Yu. P. Irkhin·Oct 31, 1998SaveLearn
The Kosterlitz-Thouless and magnetic transition temperatures in layered magnets with a weak easy-plane anisotropyThe two-dimensional (2D) Heisenberg magnet with a weak easy-plane anisotropy is considered. A renormalization group (RG) analysis in this model is performed for both quantum and classical cases. A…V. Yu. Irkhin, A. A. Katanin·Oct 31, 1998SaveLearn
Self-organized criticality and directed percolationA sandpile model with stochastic toppling rule is studied. The control parameters and the phase diagram are determined through a MF approach, the subcritical and critical regions are analyzed. The…Alexei Vazquez, Oscar Sotolongo-Costa·Oct 30, 1998SaveLearn
Correlation energy of an electron gas in strong magnetic fields at high densitiesThe high-density electron gas in a strong magnetic field B and at zero temperature is investigated. The quantum strong-field limit is considered in which only the lowest Landau level is occupied. It…M. Steinberg, J. Ortner·Oct 30, 1998SaveLearn
Current-carrying states in superconductor/insulator and superconductor/semiconductor superlattices in the mesoscopic regimeWe discuss some of the basic theoretical aspects of current-carrying states in superconducting superlattices with tunnel barriers in the mesoscopic regime, when the superconducting layer thickness is…S. V. Kuplevakhsky, A. V. Naduev, S. V. Naydenov·Oct 30, 1998SaveLearn
Symmetry Breaking with a Slant: Topological Defects after an Inhomogeneous QuenchWe show that, in second-order phase transformations induced by an inhomogeneous quench, the density of topological defects is drastically suppressed as the velocity with which the quench propagates…Jacek Dziarmaga, Pablo Laguna, Wojciech H. Zurek·Oct 29, 1998SaveLearn
Quantum dissipation due to the interaction with chaotic degrees-of-freedom and the correspondence principleBoth in atomic physics and in mesoscopic physics it is sometimes interesting to consider the energy time-dependence of a parametrically-driven chaotic system. We assume an Hamiltonian $…Doron Cohen·Oct 29, 1998SaveLearn