Field Dependence of the Magnetization for the spin-ladder material Cu2(C5H12N2)2Cl4We have developed a series expansion method for calculating the uniform magnetization, M, as a function of the applied field h for Heisenberg systems at T=0. The method involves introducing Ising…Zheng Weihong, Rajiv R. P. Singh, J. Oitmaa·Nov 22, 1996SaveLearn
Momentum creation by vortices in 3He experiments as a model of primordial baryogenesisWe show that recent 3He experiments at Manchester demonstrate the creation of excitation momentum (momentogenesis) by quantized vortices, a process analogous to baryogenesis within cosmic strings.…T. D. C. Bevan, A. J. Manninen, J. B. Cook et al.·Nov 21, 1996SaveLearn
New Fundamental dHvA Frequency in Canonical Low-Dimensional Fermi LiquidsWe show that a new fundamental period Pf of dHvA oscillations, which appears along with other ``forbidden'' combination frequencies in a multi-band canonical Fermi-liquid, is very robust…A. S. Alexandrov, A. M. Bratkovsky·Nov 21, 1996SaveLearn
Dielectric Properties of the Quasi-Two-Dimensional Electron Liquid in HeterojunctionsA quasi-two-dimensional (Q2D) electron liquid (EL) is formed at the interface of a semiconductor heterojunction. For an accurate characterization of the Q2D EL, many-body effects need to be taken…C. Bulutay, M. Tomak·Nov 21, 1996SaveLearn
Quantum Electrodynamics of Internal Source X-Ray Holographies: Bremsstrahlung, Fluorescence, and Multiple Energy X-Ray HolographyQuantum electrodynamics (qed) is used to derive the differential cross sections measured in the three new experimental internal source ensemble x-ray holographies: bremsstrahlung (BXH), fluorescence…Gerald A. Miller, Larry B. Sorensen·Nov 20, 1996SaveLearn
Spin-dependent tunneling in metal-insulator-narrow gap semiconductor structures in a magnetic fieldWe present results of tunneling studies of p-Hg1-xCdxTe-oxide-Al structures with 0.165<x<0.2 in a magnetic field up to 6 T. The tunneling conductivity oscillations resulting from the Landau…G. M. Minkov, O. E. Rut, A. V. Germanenko·Nov 20, 1996SaveLearn
Interaction-induced oscillations of the tunneling density of states in a non-quantizing magnetic fieldWe study tunneling into interacting disordered two-dimensional electron gas in a non-quantizing magnetic field, which does not cause the standard de Haas-- van Alphen oscillations. Interaction…A. M. Rudin, I. L. Aleiner, L. I. Glazman·Nov 15, 1996SaveLearn
Chaos, interactions, and nonequilibrium effects in the tunneling resonance spectra of small metallic particlesWe explain the observation of clusters in the tunneling resonance spectra of small metallic particles of few nanometer size. Each cluster of resonances is identified with one excited single--electron…Oded Agam, Ned S. Wingreen, Boris L. Altshuler et al.·Nov 14, 1996SaveLearn
Collective excitations of trapped binary mixtures of Bose-condensed gasesThe linearised time dependent coupled Gross-Pitaevskii equations describing the long wavelength excitations of Bose-condensed binary mixtures are solved, in the bulk and in harmonic traps for the…Robert Graham, Dan Walls·Nov 14, 1996SaveLearn
Langevin Equation for the Density of a System of Interacting Langevin ProcessesWe present a simple derivation of the stochastic equation obeyed by the density function for a system of Langevin processes interacting via a pairwise potential. The resulting equation is…David S. Dean·Nov 13, 1996SaveLearn
Rotational properties of trapped bosonsBased on the Hellman-Feynman theorem it is shown that the average square radius of a cloud of interacting bosons in a parabolic well can be derived from their free energy. As an application, the…F. Brosens, J. T. Devreese, L. F. Lemmens·Nov 12, 1996SaveLearn
Estimates of electronic interaction parameters for LaMO3 compounds (M=Ti-Ni) from ab-initio approachesWe have analyzed the ab-initio local density approximation band structure calculations for the family of perovskite oxides, LaMO3 with M=Ti-Ni within a parametrized nearest neighbor…Priya Mahadevan, N. Shanthi, D. D. Sarma·Nov 12, 1996SaveLearn
Phase dependent spectrum of scattered light from two Bose condensatesWe calculate the spectrum of the scattered light from quantum degenerate atomic gases obeying Bose-Einstein statistics. The atoms are assumed to occupy two ground states which are optically coupled…Janne Ruostekoski, Dan F. Walls·Nov 11, 1996SaveLearn
Lorentz Group in Condensed Matter PhysicsIt is shown that the Lorentz group plays prominent roles in at least two areas in condensed matter physics, namely in the Bogoliubov transformation and optical filters. It is pointed out that the…Y. S. Kim·Nov 11, 1996SaveLearn
Polar optical phonons at GaAs|Al(x)Ga(1-x)As interfaces: influence of the concentration of AlWe study long-wavelength polar optical modes at semiconductor interfaces of GaAs|Al(x)Ga(1-x)As and take into account influence of the Al concentration. We have considered two cases in which…A. E. Chubykalo, D. A. Contreras-Solorio, M. E. Mora-Ramos·Nov 11, 1996SaveLearn
Hidden Non-Abelian Gauge Symmetries in Doped Planar AntiferromagnetsWe investigate the possibility of hidden non-Abelian Local Phase symmetries in large-U doped planar Hubbard antiferromagnets, believed to simulate the physics of two-dimensional (magnetic)…K. Farakos, N. E. Mavromatos·Nov 10, 1996SaveLearn
Aperiodic spin chain in the mean-field approximationSurface and bulk critical properties of an aperiodic spin chain are investigated in the framework of the ϕ4 phenomenological Ginzburg-Landau theory. According to Luck's criterion, the mean…Pierre Emmanuel Berche, Bertrand Berche·Nov 9, 1996SaveLearn
Nonmonotonic Decay of Nonequilibrium Polariton Condensate in Direct-Gap SemiconductorsTime evolution of a nonequilibrium polariton condensate has been studied in the framework of a microscopic approach. It has been shown that due to polariton-polariton scattering a significant…Igor V. Beloussov, Vladimir V. Frolov·Nov 8, 1996SaveLearn
Bose-Einstein Condensation in Anisotropic Harmonic TrapsWe study the thermodynamic behaviour of an ideal gas of bosons trapped in a three-dimensional anisotropic harmonic oscillator potential. The condensate fraction as well as the specific heat is…T. Haugset, H. Haugerud, J. O. Andersen·Nov 8, 1996SaveLearn
Effects of boundary conditions on magnetization switching in kinetic Ising models of nanoscale ferromagnetsMagnetization switching in highly anisotropic single-domain ferromagnets has been previously shown to be qualitatively described by the droplet theory of metastable decay and simulations of…Howard L. Richards, M. Kolesik, Per-Anker Lindgard et al.·Nov 7, 1996SaveLearn
Incommensurate nodes in the energy spectrum of weakly coupled antiferromagnetic Heisenberg laddersHeisenberg ladders are investigated using the bond-mean-field theory [M.Azzouz, Phys. Rev. B 48, 6136 (1993)]. The zero inter-ladder coupling energy gap, the uniform spin susceptibility and the…M. Azzouz, B. Dumoulin, A. Benyoussef·Nov 6, 1996SaveLearn
Correlations in one dimensional quantum impurity problems with an external fieldWe study response functions of integrable quantum impurity problems with an external field at T=0 using non perturbative techniques derived from the Bethe ansatz. We develop the first steps of the…F. Lesage, H. Saleur·Nov 5, 1996SaveLearn
Controlling Smart MatterSmart matter consists of many sensors, computers and actuators embedded within materials. These microelectromechanical systems allow properties of the materials to be adjusted under program control.…Tad Hogg, Bernardo A. Huberman·Nov 4, 1996SaveLearn
Finite temperature excitations of a trapped Bose gasWe present a detailed study of the temperature dependence of the condensate and noncondensate density profiles of a Bose-condensed gas in a parabolic trap. These quantitites are calculated…D. A. W. Hutchinson, E. Zaremba, A. Griffin·Nov 4, 1996SaveLearn
Classical artificial two-dimensional atoms: the Thomson modelThe ring configurations for classical two-dimensional atoms are calculated within the Thomson model and compared with the results from `exact' numerical simulations. The influence of the…B. Partoens, F. M. Peeters·Nov 1, 1996SaveLearn