Non-Fermi Behavior of the Strongly Correlated Electron Systems(1) The temperature dependence of the specific heat for a marginal Fermi liquid has been calculated. (2) We calculated the self-energy at T=0 for a two dimensional fermionic system with hyperbolic…Catalin Pascu Moca·Nov 21, 1999SaveLearn
Correlated sampling in quantum Monte Carlo: a route to forcesIn order to find the equilibrium geometries of molecules and solids and to perform ab initio molecular dynamics, it is necessary to calculate the forces on the nuclei. We present a correlated…Claudia Filippi, C. J. Umrigar·Nov 20, 1999SaveLearn
Dynamic charge density correlation function in weakly charged polyampholyte globulesWe study solutions of statistically neutral polyampholyte chains containing a large fraction of neutral monomers. It is known that, even if the quality of the solvent with respect to the neutral…Hindrik Jan Angerman, Eugene Shakhnovich·Nov 19, 1999SaveLearn
Coherent Evolution of Bouncing Bose-Einstein CondensatesWe investigate the evolution of Bose-Einstein condensates falling under gravity and bouncing off a mirror formed by a far-detuned sheet of light. After reflection, the atomic density profile develops…K. Bongs, S. Burger, G. Birkl et al.·Nov 19, 1999SaveLearn
Generalized Exclusion Statistics in the Kondo ProblemWe consider the generalized exclusion statistics in the Kondo problem. The thermodynamic Bethe ansatz equations have been used for a multicomponent system of particles obeying the generalized…A. P. Protogenov, V. A. Verbus·Nov 19, 1999SaveLearn
Time-dependent transport in interacting mesoscopic systemsWe review recent applications of the nonequilibrium Green function technique to time-dependent transport in mesoscopic systems.A. P. Jauho·Nov 18, 1999SaveLearn
Dynamics of liquid 4He in VycorWe have measured the dynamic structure factor of liquid 4He in Vycor using neutron inelastic scattering. Well-defined phonon-roton (p-r) excitations are observed in the superfluid phase for all wave…H. R. Glyde, O. Plantevin, B. Fak et al.·Nov 18, 1999SaveLearn
Trapping with biased diffusion speciesWe analyze a trapping reaction with a single penetrable trap, in a one dimensional lattice, where both species (particles and trap) are mobile and have a drift velocity. We obtain the density as seen…Alejandro D. Sanchez·Nov 17, 1999SaveLearn
A Microscopic Look at Liquid Helium: the 3He Impurity CaseThe description of the properties of liquid Helium is a challenge for any microscopic many-body theory. In this context, we study the ground state and the excitation spectrum of one 3He impurity…A. Polls, A. Fabrocini·Nov 17, 1999SaveLearn
Bose-Einstein Condensation in a Constant Magnetic FieldWe discuss the occurrence of Bose-Einstein condensation in systems of noninteracting charged particles in three in one dimensions and in presence of an external magnetic field. In the one…H. Perez, L. Villegas·Nov 15, 1999SaveLearn
Chern-Simons Correlations on (2+1)D LatticeWe have computed the contribution of zero modes to the value of the number of particles in the model of discrete (2+1)-dimensional nonlinear Schrödinger equation. It is shown for the first time that…L. A. Abramyan, A. P. Protogenov, V. A. Verbus·Nov 15, 1999SaveLearn
Condensation and interaction range in harmonic boson traps: a variational approachFor a gas of N bosons interacting through a two-body Morse potential a variational bound of the free energy of a confined system is obtained. The calculation method is based on the Feynman-Kac…J. Tempere, F. Brosens, L. F. Lemmens et al.·Nov 14, 1999SaveLearn
LAPW frozen-phonon calculation, shell model lattice dynamics and specific-heat measurement of SnOAn ab-initio Linear Augmented Plane-Wave (LAPW) calculation of the zone-centered phonon frequencies of SnO has been performed. Eg symmetry has been ascribed to the mode observed at 113 cm-1…S. Koval, R. Burriel, M. G. Stachiotti et al.·Nov 13, 1999SaveLearn
4f spin density in the reentrant ferromagnet SmMn2Ge2The spin contribution to the magnetic moment in SmMn2Ge2 has been measured by magnetic Compton scattering in both the low and high temperature ferromagnetic phases. At low temperature, the Sm site is…Joanne E. McCarthy, Jonathan A. Duffy, Carsten Detlefs et al.·Nov 12, 1999SaveLearn
Stationary solutions of the one-dimensional nonlinear Schroedinger equation: II. Case of attractive nonlinearityAll stationary solutions to the one-dimensional nonlinear Schroedinger equation under box or periodic boundary conditions are presented in analytic form for the case of attractive nonlinearity. A…Lincoln D. Carr, Charles W. Clark, William P. Reinhardt·Nov 12, 1999SaveLearn
Stationary solutions of the one-dimensional nonlinear Schroedinger equation: I. Case of repulsive nonlinearityAll stationary solutions to the one-dimensional nonlinear Schroedinger equation under box and periodic boundary conditions are presented in analytic form. We consider the case of repulsive…Lincoln D. Carr, Charles W. Clark, William P. Reinhardt·Nov 12, 1999SaveLearn
Quantum Poincare Recurrences for Hydrogen Atom in a Microwave FieldWe study the time dependence of the ionization probability of Rydberg atoms driven by a microwave field, both in classical and in quantum mechanics. The quantum survival probability follows the…Giuliano Benenti, Giulio Casati, Giulio Maspero et al.·Nov 12, 1999SaveLearn
Some aspects of functional Bethe ansatzThe validity of Bethe ansatz wave function without the backward scattering for the problem of impurity in correlated hosts with periodic boundary condition is illustrated by a simple example of…You-Quan Li·Nov 12, 1999SaveLearn
Edge currents in the absence of edgesWe investigate a charged two-dimensional particle in a homogeneous magnetic field interacting with a periodic array of point obstacles. We show that while Landau levels remain to be infinitely…Pavel Exner, Alain Joye, Hynek Kovarik·Nov 12, 1999SaveLearn
Excitonic Strings in one dimensional organic compoundsImportant questions concern the existence of excitonic strings in organic compounds and their signatures in the photophysics of these systems. A model in terms of Hard Core Bosons is proposed to…S. Pleutin·Nov 11, 1999SaveLearn
An electron correlation originated negative magnetoresistance in a system having a partly flat bandInspired from an experimentally examined organic conductor, a novel mechanism for negative magnetoresistance is proposed for repulsively interacting electrons on a lattice whose band dispersion…Ryotaro Arita, Kazuhiko Kuroki, Hideo Aoki·Nov 11, 1999SaveLearn
Critical Temperature and Nonextensivity in Long-range Interacting Lennard-Jones-like FluidsMolecular dynamic simulations for systems with D=2,3 Lennard-Jones-like interactions are studied. In the model, we assume that, at long distances, the two-body attractive potential decays as…Sergio Curilef, Constantino Tsallis·Nov 10, 1999SaveLearn
Ground-state energy of a high-density electron gas in a strong magnetic fieldThe 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·Nov 10, 1999SaveLearn
Thermodynamics of a trapped Bose condensate with negative scattering lengthWe study the Bose-Einstein condensation (BEC) for a system of 7Li atoms, which have negative scattering length (attractive interaction), confined in a harmonic potential. Within the Bogoliubov and…B. Pozzi, L. Salasnich, A. Parola et al.·Nov 9, 1999SaveLearn
Cooper Pairing in Ultracold K-40 Using Feshbach ResonancesWe point out that the fermionic isotope K-40 is a likely candidate for the formation of Cooper pairs in an ultracold atomic gas. Specifically, in an optical trap that simultaneously traps the spin…John L. Bohn·Nov 9, 1999SaveLearn