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Condensed Matter papers — page 228

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Exact results for quantum phase transitions in random XY spin chains
The effect of disorder on the quantum phase transitions induced by a transverse field, anisotropy, and dimerization in XY spin chains is investigated. The low-energy behavior near the critical point…
Ross H. McKenzieSep 20, 1996
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Renormalizing Rectangles and Other Topics in Random Matrix Theory
We consider random Hermitian matrices made of complex or real M× N rectangular blocks, where the blocks are drawn from various ensembles. These matrices have N pairs of opposite real…
Joshua Feinberg, A. ZeeSep 19, 1996
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Family of Affine Quantum Group Invariant Integrable Extensions of Hubbard Hamiltonian
We construct the family of spin chain Hamiltonians, which have affine quantum group symmetry. Their eigenvalues coincide with the eigenvalues of the usual spin chain Hamiltonians, but have the…
A. Avakyan, T. Hakobyan, A. SedrakyanSep 19, 1996
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Low temperature relaxational dynamics of the Ising chain in a transverse field
We present asymptotically exact results for the real time order parameter correlations of a class of d=1 Ising models in a transverse field at low temperatures (T) on both sides of the quantum…
Subir Sachdev, A. P. YoungSep 19, 1996
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Squeezed Phonon States: Modulating Quantum Fluctuations of Atomic Displacements
We study squeezed quantum states of phonons, which allow the possibility of modulating the quantum fluctuations of atomic displacements below the zero-point quantum noise level of coherent phonon…
X. Hu, Franco NoriSep 19, 1996
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Exchange Instabilities in Semiconductor Double Quantum Well Systems
We consider various exchange-driven electronic instabilities in semiconductor double-layer systems in the absence of any external magnetic field. We establish that there is no exchange-driven bilayer…
Lian Zheng, M. W. Ortalano, S. Das SarmaSep 19, 1996
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Hall-Effect Sign Anomaly and Small-Polaronic Conduction in (La1-xGdx)0.67Ca0.33MnO3
The Hall coefficient of Gd-doped La2/3Ca1/3MnO3 exhibits Arrhenius behavior over a temperature range from 2Tc to 4Tc, with an activation energy very close to 2/3 that of the electrical…
M. Jaime, H. T. Hardner, M. B. Salamon et al.Sep 19, 1996
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Disorder-driven non-Fermi liquid behavior in Kondo alloys
We demonstrate that a model of disordered Anderson lattices can account for many non-Fermi liquid features observed in a number of Kondo alloys. Due to the exponential nature of the Kondo temperature…
E. Miranda, V. Dobrosavljevic, G. KotliarSep 19, 1996
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Aging and its Distribution in Coarsening Processes
We investigate the age distribution function P(tau,t) in prototypical one-dimensional coarsening processes. Here P(tau,t) is the probability density that in a time interval (0,t) a given site was…
L. Frachebourg, P. L. Krapivsky, S. RednerSep 19, 1996
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Nonequilibrium Critical Dynamics of a Three Species Monomer-Monomer Model
We study a three species monomer-monomer catalytic surface reaction model with a reactive steady state bordered by three equivalent unreactive phases where the surface is saturated with one species.…
K. E. Bassler, D. A. BrowneSep 19, 1996
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A Variational Approach to Nonlocal Exciton-Phonon Coupling
In this paper we apply variational energy band theory to a form of the Holstein Hamiltonian in which the influence of lattice vibrations (optical phonons) on both local site energies (local coupling)…
Yang Zhao, David W. Brown, Katja LindenbergSep 19, 1996
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Semiclassical theory for many-body Fermionic systems
We present a treatment of many-body Fermionic systems that facilitates an expression of the well-known quantities in a series expansion of the Planck's constant. The ensuing semiclassical result…
Pierre Gaspard, Sudhir R. JainSep 19, 1996
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Spectral properties of the t-J model in the presence of hole-phonon interaction
We examine the effects of electron-phonon interaction on the dynamics of the charge carriers doped in two-dimensional (2D) Heisenberg antiferromagnet. The t-J model Hamiltonian with a Fröhlich…
B. Kyung, S. I. Mukhin, V. N. Kostur et al.Sep 19, 1996
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Quantitative study of a freely cooling granular medium
We present a numerical study of a two dimensional granular medium consisting of hard inelastic disks. The evolution of the medium throughout a cooling process is monitored. Two different types of…
Pierre Deltour, Jean-Louis BarratSep 19, 1996
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Resistive transport in a mesoscopic proximity superconductor
We review transport measurements in a normal metal (N) in contact with one or two superconducting (S) islands. From the experiment, we distinguish the Josephson coupling, the mesoscopic fluctuations…
P. Charlat, H. Courtois, Ph. Gandit et al.Sep 19, 1996
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Monte Carlo study of the Villain version of the fully frustrated XY model
The fully frustrated XY model with Villain interaction on a square lattice is studied by means of Monte Carlo simulations. On the basis of the universal jump condition it is argued that there are two…
Peter OlssonSep 19, 1996
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Non-Fermi-liquid behavior due to short range order
An exactly soluble one-dimensional model of electrons interacting with order parameter fluctations associated with short-range order is considered. The energy and momentum dependence of the…
Ross H. McKenzie, David ScarrattSep 19, 1996
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Molecular Dynamics Simulation of Spinodal Decomposition in Three-Dimensional Binary Fluids
Using large-scale molecular dynamics simulations of a two-component Lennard-Jones model in three dimensions, we show that the late-time dynamics of spinodal decomposition in concentrated binary…
Mohamed Laradji, Soeren Toxvaerd, Ole G. MouritsenSep 18, 1996
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Anomalous flux-flow dynamics in layered type-II superconductors at low temperatures
Low-temperature dissipation due to vortex motion in strongly anisotropic type-II superconductors with a moderate disorder (Δ2/EF /τ Δ) is shown to be determined by the Zener-type…
M. V. Feigel'man, M. A. SkvortsovSep 18, 1996
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Financial markets as adaptative ecosystems
We show, by studying in detail the market prices of options on liquid markets, that the market has empirically corrected the simple, but inadequate Black-Scholes formula to account for two important…
Marc Potters, Rama Cont, Jean-Philippe BouchaudSep 18, 1996
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Long-Range Excitons in Optical Absorption Spectra of Electroluminescent Polymer Poly(para-phenylenevinylene)
The component of photoexcited states with large spatial extent is investigated for poly(para-phenylenevinylene) using the intermediate exciton theory. We find a peak due to long-range excitons at the…
Kikuo HarigayaSep 18, 1996
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Factors Governing the Foldability of Proteins
We use a three dimensional cubic lattice model of proteins to study their properties that determine folding to the native state. The protein chain is modeled as a sequence of N beads. The…
D. K. Klimov, D. ThirumalaiSep 18, 1996
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Band Degeneracy and Mott Transition: Dynamical Mean Field Study
We investigate the Mott transition in infinite dimensions in the orbitally degenerate Hubbard model. We find that the qualitative features of the Mott transition found in the one band model are also…
Henrik Kajueter, Gabriel KotliarSep 18, 1996
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Line Junctions in the Quantum Hall Effect
A long skinny gate across a fractional quantum Hall fluid at filling ν=1/m with odd integer m, creates a novel one-dimensional (1d) system which is isomorphic to a disordered 1d electron gas with…
C. L. Kane, Matthew P. A. FisherSep 18, 1996
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Non Fermi liquid renormalization of the conductivity of fermions coupled to gauge fields
The method of the quantum kinetic equation is applied to the problem of renormalization of the conductivity of normal metals by gauge electron-electron interactions. It is shown that in the…
D. V. Khveshchenko, Michael ReizerSep 18, 1996
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