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Condensed Matter papers — page 199

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Spin wave mediated non-reciprocal effects in antiferromagnets
By using an effective field theory for the electromagnetic interaction of spin waves, we show that, in certain antiferromagnets, the latter induce non-reciprocal effects in the microwave region,…
J. M. Roman, J. SotoSep 26, 1997
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Effective Field Theory Approach to Ferromagnets and Antiferromagnets in Crystaline Solids
We present a systematic construction of effective lagrangians for the low energy and momentum region of ferromagnetic and antiferromagnetic spin waves in crystalline solids. We fully exploit the…
J. M. Roman, J. SotoSep 26, 1997
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Spin holography II
The interference of the directly emitted photoelectron wave and the wave scattered coherently by neighboring atoms gives holographic fringes in the photoelectron emission intensity I( R).…
Eddy Timmermans, G. T. Trammell, J. P. HannonSep 26, 1997
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Theoretical analysis of the experiments on the double-spin-chain compound -- KCuCl3
We have analyzed the experimental susceptibility data of KCuCl3 and found that the data are well-explained by the double-spin-chain models with strong antiferromagnetic dimerization. Large quantum…
Tota Nakamura, Kiyomi OkamotoSep 26, 1997
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Dynamical fluctuations in an exactly solvable model of spin glasses
In this work we calculate the dynamical fluctuations at O(1/N) in the low temperature phase of the p=2 spherical spin glass model. We study the large-times asymptotic regimes and we find, in a…
Matteo Campellone, Giorgio Parisi, Paola RanieriSep 25, 1997
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A Unified Construction of Variational Methods for the Nonlinear Schroedinger Equation
Based on an approach introduced byGerjuoy, Rau, and Spruch, we constract variational principles in a systematic way for the nonlinear Schroedinger equation and obtain new variational principles for…
Yeong E. Kim, Alexander L. ZubarevSep 24, 1997
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From Tomonaga-Luttinger to Fermi liquid in transport through a tunneling barrier
Finite length of a one channel wire results in crossover from a Tomonaga-Luttinger to Fermi liquid behavior with lowering energy scale. In condition that voltage drop (V) mostly occurs across a…
Vadim Ponomarenko, Naoto NagaosaSep 24, 1997
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Redistribution of the Hole Spectral Weight due to Long-Range Spin Correlations in the Three-Band Hubbard Model
In the framework of the three-band model for CuO2 plane in high-temperature superconductors the spectrum of the spin-polaron hole exitation is investigated. The problem is treated taking into…
A. F. Barabanov, O. V. Urazaev, E. Zasinas et al.Sep 24, 1997
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Damping in dilute Bose gases: a mean-field approach
Damping in a dilute Bose gas is investigated using a mean-field approximation which describes the coupled oscillations of condensate and non-condensate atoms in the collisionless regime. Explicit…
S. GiorginiSep 24, 1997
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Non-perturbative Results on Universal Quantities of Statistical Mechanics Models
Exact calculations of some universal quantities of two-dimensional statistical models in the vicinity of their fixed points are illustrated.
G. MussardoSep 23, 1997
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Intrinsic Decoherence in Mesoscopic Systems
We point out that even at the absolute zero of temperature environmental decoherence limits the destructive interference between time-reversed paths for an electron in a disordered metal, and thus…
Maxim Vavilov, Vinay AmbegaokarSep 22, 1997
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The Longuet-Higgins Phase and Charge Transport in Molecular Rings
The Longuet-Higgins-Berry's phase has remarkable consequences for charge transport in molecular rings. For generic (conical) crossing, where the phase is π, a vanishing cause can lead to a…
J. E. Avron, J. BergerSep 22, 1997
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Quasiparticle Lifetimes and the Conductivity Scattering Rate
We compute the single-particle inverse lifetime, along with the conductivity-derived scattering rate, for a metallic system in an s-wave superconducting state. When both electron-phonon and…
F. Marsiglio, J. P. CarbotteSep 22, 1997
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Zero-temperature dynamic transition in the random field Ising model: A Monte Carlo study
The dynamics of a random (quenched) field Ising model (in two dimension) at zero temperature in the presence of an additional sinusoidally oscillating homogeneous (in space) magnetic field has been…
Muktish AcharyyaSep 19, 1997
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Dilute Bose gas in a torus: vortices and persistent currents
We consider the excitation spectrum and stability of quantized vortices in a weakly-interacting Bose gas trapped in a toroidal container, and discuss the driven rotation of such a condensate.
D. S. RokhsarSep 18, 1997
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Magneto-Roton Modes in the Ultra Quantum Crystal: Life and Death at Large Magnetic Field
The Ultra Quantum Crystal (UQC) phases observed in quasi-one-dimensional conductors of the Bechgaard salts family under magnetic field exhibit both Spin Density Wave order and a Quantized Hall…
Pascal Lederer, C. M. ChavesSep 18, 1997
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Magnetoresistance of the double-tunnel-junction Coulomb Blockade with magnetic metals
We have studied the Junction Magnetoresistance (JMR) and the Differential junction magnetoresistance (DJMR) for double tunnel junctions with magnetic metals in the Coulomb Blockade regime. Spikes are…
Kingshuk Majumdar, Selman HershfieldSep 18, 1997
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Structural Consequences of the Range of the Interatomic Potential: a Menagerie of Clusters
We have attempted to find the global minima of clusters containing between 20 and 80 atoms bound by the Morse potential as a function of the range of the interatomic force. The effect of decreasing…
Jonathan Doye, David WalesSep 18, 1997
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Theory of Spontaneous Polarization of Endohedral Fullerenes
A pseudo-Jahn-Teller model describing central atom distortions is proposed for endohedral fullerenes of the form A@C60 where A is either a rare gas or a metal atom. A critical (dimensionless)…
Dennis P. Clougherty, Frederick G. AndersonSep 16, 1997
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Polaron Dissociation at the Insulator-to-Metal Transition
Considering the long range Coulomb interactions between large polarons in dielectrics, we propose a model for their crystallization when no bipolarons are formed. As the density increases, the…
P. Quemerais, S. FratiniSep 16, 1997
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Anomalous finite size spectrum in the S=1/2 two dimensional Heisenberg model
We study the low energy spectrum of the nearest neighbor Heisenberg model on a square lattice as a function of the total spin S. By quantum Monte Carlo simulation we compute this spectrum for the…
C. Lavalle, S. Sorella, A. ParolaSep 16, 1997
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Dynamical properties of the compounds CuGeO3 and α'--NaV2O5 at temperatures T≠ 0
The dynamical structure factor of the frustrated spin 1/2 Heisenberg model for a series of frustration parameters at finite temperatures is presented. A sharp upper boundary of the spinon continuum…
K. Fabricius, U. LöwSep 15, 1997
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Fractal properties of clusters of colloidal magnetic particles
We have studied the properties of clusters of colloidal magnetic particles generated from a 2D aggregation model with dipolar interparticle interactions. Particles diffuse off-lattice, experiencing…
R. Pastor-Satorras, J. M. RubiSep 15, 1997
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The Phase Structure of Antiferromagnetic Ising Model in the Presence of Frustrations
The antiferromagnetic Ising model in a magnetic field is considered on the Husimi tree. Using iteration technique we draw the plots of magnetization versus external field for different temperatures…
A. Z. Akheyan, N. S. Ananikian, S. K. DallakianSep 15, 1997
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Spin-density Wave in Ising-coupled Antiferromagnetic Chains
The effect of anisotropy in the nearest-neighbor spin interactions that couple N≥ 2 consecutive spin-1/2 antiferromagnetic chains is studied theoretically by considering the limit where the…
J. P. Rodriguez, P. D. Sacramento, V. R. VieiraSep 13, 1997
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