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Condensed Matter papers — page 190

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Metallic Phase and Metal-insulator Transition in 2d Electronic Systems
The recent experimental observation of a metal-insulator transition in two dimensions prompts a re-examination of the theory of disordered interacting systems. We argue that the existing theory…
C. Castellani, C. Di Castro, P. A. LeeJan 2, 1998
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Multi-Overlap Simulations of the 3d Edwards-Anderson Ising Spin Glass
We introduce a novel method for numerical spin glass investigations: Simulations of two replica at fixed temperature, weighted such that a broad distribution of the Parisi overlap parameter q is…
Bernd A. Berg, Wolfhard JankeDec 30, 1997
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Low energy effective Hamiltonian for the XXZ spin chain
Coupling constants for the most relevant terms in the low energy effective Hamiltonian of the XXZ spin chain are derived. Using this result we study the low energy (low temperature, weak magnetic…
S. LukyanovDec 30, 1997
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Onsets of avalanches in the BTW model
The onsets of toppling and dissipation in the BTW model are studied by computer simulation. The distributions of these two onset times and their dependences on the system size are also studied.…
Ajanta BhowalDec 29, 1997
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Engineering Superfluidity in Electron-Hole Double Layers
We show that band-structure effects are likely to prevent superfluidity in semiconductor electron-hole double-layer systems. We suggest the possibility that superfluidity could be realized by the…
Sergio Conti, Giovanni Vignale, A. H. MacDonaldDec 28, 1997
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Quantum Tunneling in Ferrimagnetic Nanoparticles Coupled to a Spin Bath: An Effective Hamiltonian
An effective Hamiltonian, describing quantum tunneling in ferrimagnetic nanoparticles which includes interactions between the electronic spins of nanoparticle and microscopic environmental spins…
I. S. TupitsynDec 26, 1997
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Homodyne Measurements on a Bose-Einstein Condensate
We investigate a non-destructive measurement technique to monitor Josephson-like oscillations between two spatially separated neutral atom Bose-Einstein condensates. One condensate is placed in an…
J. F. Corney, G. J. MilburnDec 24, 1997
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Weiss Oscillations in Surface Acoustic Wave Propagation
The interaction of a surface acoustic wave (SAW) with a a two-dimensional electron gas in a periodic electric potential and a classical magnetic field is considered. We calculate the attenuation of…
Y. Levinson, O. Entin-Wohlman, A. D. Mirlin et al.Dec 23, 1997
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Quantum fluctuations of classical skyrmions in quantum Hall Ferromagnets
In this article, we discuss the effect of the zero point quantum fluctuations to improve the results of the minimal field theory which has been applied to study %SMG the skyrmions in the quantum Hall…
M. AbolfathDec 22, 1997
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Echo in Optical Lattices: Stimulated Revival of Breathing Oscillations
We analyze a stimulated revival (echo) effect for the breathing modes of the atomic oscillations in optical lattices. The effect arises from the dephasing due to the weak anharmonicity being partly…
A. Bulatov, A. Kuklov, B. E. Vugmeister et al.Dec 20, 1997
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Nature of the Low Field Transition in the Mixed State of High Temperature Superconductors
We have numerically studied the statics and dynamics of a model three-dimensional vortex lattice at low magnetic fields. For the statics we use a frustrated 3D XY model on a stacked triangular…
Seungoh Ryu, David StroudDec 19, 1997
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Generation of Large Moments in a Spin-1 Chain with Random Antiferromagnetic Couplings
We study the spin-1 chain with nearest neighbor couplings that are rotationally invariant, but include both Heisenberg and biquadratic exchange, with random strengths. We demonstrate, using…
Kun Yang, R. N. BhattDec 19, 1997
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A discretized integral hydrodynamics
Using an interpolant form for the gradient of a function of position, we write an integral version of the conservation equations for a fluid. In the appropriate limit, these become the usual…
Victor Romero-Rochin, J. Miguel RubiDec 19, 1997
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On solitary waves in classical anisotropic Heisenberg chains with generalized boundary conditions
We examine solitary waves in classical Heisenberg chains with an uniaxial anisotropy and a parallel magnetic field in a continuum approach. The boundary conditions commonly used are generalized to…
John Schliemann, Franz G. MertensDec 19, 1997
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Dual Response Models for the Fractional Quantum Hall Effect
It is shown that the Jain mapping between states of integer and fractional quantum Hall systems can be described dynamically as a perturbative renormalization of an effective Chern-Simons field…
L. Cooper, I. I. Kogan, A. Lopez et al.Dec 18, 1997
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A Statistical Mechanical Approximation for the Calculation of Time Auto-Correlation Functions
This paper considers the problem of estimating the time auto-correlation function for a quantity that is defined in configuration space, given a knowledge of the mean-square displacement as function…
Jeppe C. DyreDec 18, 1997
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Efficient Diagonalization of Kicked Quantum Systems
We show that the time evolution operator of kicked quantum systems, although a full matrix of size NxN, can be diagonalized with the help of a new method based on a suitable combination of fast…
R. Ketzmerick, K. Kruse, T. GeiselDec 17, 1997
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Thermal Properties of Interacting Bose Fields and Imaginary-Time Stochastic Differential Equations
Matsubara Green's functions for interacting bosons are expressed as classical statistical averages corresponding to a linear imaginary-time stochastic differential equation. This makes direct…
L. I. Plimak, M. Fleischhauer, D. F. WallsDec 17, 1997
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Sign reversals of the quantum Hall effect and helicoidal magnetic-field-induced spin-density waves in quasi-one-dimensional organic conductors
We study the effect of umklapp scattering on the magnetic-field-induced spin-density-wave phases, which are experimentally observed in the quasi-one-dimensional organic conductors of the Bechgaard…
N. Dupuis, Victor M. YakovenkoDec 17, 1997
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Dynamics of a Pair of Interacting Spins Coupled to an Environmental Sea
We solve for the dynamics of a pair of spins, coupled to each other and also to an environmental sea of oscillators. The environment mediates an indirect interaction between the spins, causing both…
M. Dube, P. C. E. StampDec 17, 1997
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Phase-diagram for Irregular and Non-Symmetric Cross-linked Polymer Blends
We consider here a blend made of two types of polymers, A and B, of different chemical nature. At high temperature the homogeneous mixture is cross-linked. As the temperature is lowered, the two…
Edilson Vargas, Marcia C. BarbosaDec 17, 1997
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Phase-Boundaries near Critical End points: Applications to Cross-linked Copolymers
The phase behavior of a cross-linked polymer blend made of two incompatible species, A and B, of different chemical nature is analyzed. Besides a homogeneous phase, this system also exhibits two…
Edilson Vargas, Marcia C. BarbosaDec 17, 1997
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Domain structures in ultrathin magnetic films
Domain structures appear in ultrathin magnetic films, if an easy-axis anisotropy, favouring the direction perpendicular to the film, overcomes the shape anisotropy. We will study the nature of the…
Paolo PolitiDec 17, 1997
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Magnetic Field Inversion in Vortices in Multilayers
We present a description of very dense vortex lattices in highly anisotropic multilayers, for high fields parallel to the layers. We show that a magnetic field inversion can occur away from the…
Stavros Theodorakis, Epameinondas LeontidisDec 17, 1997
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Quantum Decoherence and Weak Localization at Low Temperatures
We develope a theory of a fundamental effect of the interaction-induced decoherence of the electron wave function in a disordered metal. With the aid of the Keldysh technique and the path integral…
Dmitrii S. Golubev, Andrei D. ZaikinDec 17, 1997
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