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Condensed Matter papers — page 196

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Magneto-Transport in the Two-Dimensional Lorentz Gas
We consider the two-dimensional Lorentz gas with Poisson distributed hard disk scatterers and a constant magnetic field perpendicular to the plane of motion. The velocity autocorrelation is computed…
Alexander Kuzmany, Herbert SpohnOct 27, 1997
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First and Second Sound Modes of a Bose-Einstein Condensate in a Harmonic Trap
We have calculated the first and second sound modes of a dilute interacting Bose gas in a spherical trap for temperatures (0.6<T/Tc<1.2) and for systems with 104 to 108 particles. The…
V. B. Shenoy, Tin-Lun HoOct 24, 1997
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Random Walks, Reaction-Diffusion, and Nonequilibrium Dynamics of Spin Chains in One-dimensional Random Environments
Sinai's model of diffusion in one-dimension with random local bias is studied by a real space renormalization group which yields asymptotically exact long time results. The distribution of the…
Daniel Fisher, Pierre Le Doussal, Cecile MonthusOct 24, 1997
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The Hydrodynamic Equations of Superfluid Mixtures in Magnetic Traps
The hydrodynamics equations of binary mixtures of Bose gases, Fermi gases, and mixtures of Bose and Fermi gases in the presence of external potentials are derived. These equations can be applied to…
Tin-Lun Ho, V. B. ShenoyOct 24, 1997
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Dynamics of bilayer membranes. 1. Isolated membrane
By adopting the approximations suggested in the theory of thin shells, the hydrodynamic theory of liquid crystals established by Eriksen [Arch. Rational Mech. Anal. 4 (1960) 231; Trans. Soc. Rheol. 4…
Rong WangOct 24, 1997
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Dynamics of Bilayer Membranes. 2. Connection with Normal Fluids
The exchange of mass, momentum and energy between a membrane of liquid crystal and its surroundings of stokesian fluids is added to the dynamic equations of membranes which were deduced from the…
Rong WangOct 24, 1997
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Low Temperature Behavior of the Kondo Effect in Tomonaga-Luttinger Liquid
Using the bosonization method, we study the low temperature behavior of the Kondo effect in the Tomonaga-Luttinger liquid and clearly show that the power law temperature dependence of the impurity…
Yu-Liang LiuOct 24, 1997
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Infinite coupling magnon theory of quantum Heisenberg magnetic models of spin s
An infinity magnon coupling term is introduced into the Holstein-Primakoff transformed forms of the Heisenberg ferromagnetic and antiferromagnetic models of any spin s to rigorously remove the…
Bang-Gui Liu, Gerd CzychollOct 24, 1997
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Obtaining Wannier Functions of a Crystalline Insulator within a Hartree-Fock approach: Applications to LiF and LiCl
An ab initio Hartree-Fock approach aimed at directly obtaining the localized orthogonal orbitals (Wannier functions) of a crystalline insulator is described in detail. The method is used to perform…
Alok Shukla, Michael Dolg, Peter Fulde et al.Oct 23, 1997
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A simple ansatz to describe thermodynamic quantities of peptides and proteins at low temperatures
We describe a simple ansatz to approximate the low temperature behavior of proteins and peptides by a mean-field-like model which is analytically solvable. For a small peptide some thermodynamic…
Ulrich H. E. Hansmann, Philippe de ForcrandOct 23, 1997
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Low-Temperature Quantum Relaxation in a System of Magnetic Nanomolecules
We argue that to explain recent resonant tunneling experiments on crystals of Mn12 and Fe8, particularly in the low-T limit, one must invoke dynamic nuclear spin and dipolar interactions. We…
Nikolai Prokof'ev, Philip StampOct 23, 1997
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Creation of Dark Solitons and Vortices in Bose-Einstein Condensates
We propose and analyze a scheme to create dark solitons and vortices in Bose-Einstein condensates. This is achieved starting from a condensate in the internal state |a> and transferring the atoms…
R. Dum, J. I. Cirac, M. Lewenstein et al.Oct 22, 1997
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Numerical simulations of a two-dimensional lattice grain boundary model
We present detailed Monte Carlo results for a two-dimensional grain boundary model on a lattice. The effective Hamiltonian of the system results from the microscopic interaction of grains with…
A. Jaster, H. HahnOct 22, 1997
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Muon spin rotation and relaxation in magnetic materials
A review of the muon spin rotation and relaxation (μSR) studies on magnetic materials published from July 1993 is presented. It covers the investigation of magnetic phase diagrams, of spin dynamics…
P Dalmas de Reotier, A YaouancOct 22, 1997
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Matrices coupled in a chain. II. Spacing functions
For the eigenvalues of p complex hermitian n× n matrices coupled in a chain, we give a method of calculating the spacing functions. This is a generalization of the one matrix case which has…
G. Mahoux, M. L. Mehta, J. -M. NormandOct 22, 1997
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Matrices coupled in a chain. I. Eigenvalue correlations
The general correlation function for the eigenvalues of p complex hermitian matrices coupled in a chain is given as a single determinant. For this we use a slight generalization of a theorem of…
B. Eynard, M. L. MehtaOct 22, 1997
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Percolation and Cluster Formalism in Continuous Spin Systems
The generalization of Kasteleyn and Fortuin clusters formalism is introduced in XY (or more generally O(n)) models. Clusters geometrical structure may be linked to spin physical properties as…
Mario NicodemiOct 21, 1997
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Force correlations and arches formation in granular assemblies
In the context of a simple microscopic schematic scalar model we study the effects of spatial correlations in force transmission in granular assemblies. We show that the parameters of the normalized…
Mario NicodemiOct 21, 1997
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A computer simulation study of ionic conductivity in polymer electrolytes
In this paper we present a computer simulation study of ionic conductivity in solid polymeric electrolytes. The multiphase nature of the material is taken into account. The polymer is represented by…
Aninda Jiban Bhattacharyya, T. R. Middya, S. TarafdarOct 21, 1997
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Skyrmions in arbitrarily polarized quantum Hall states
We derive an effective non-linear sigma model for quantum hall systems with arbitrary polarizations, by employing the recently proposed doublet model. We study the topological excitations, in…
Sudhansu S. Mandal, V. RavishankarOct 21, 1997
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Epidemic analysis of the second-order transition in the Ziff-Gulari-Barshad surface-reaction model
We study the dynamic behavior of the Ziff-Gulari-Barshad (ZGB) irreversible surface-reaction model around its kinetic second-order phase transition, using both epidemic and poisoning-time analyses.…
Christopher A. Voigt, Robert M. ZiffOct 21, 1997
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Supersymmetry, Shape Invariance and Solvability of AN-1 and BCN Calogero-Sutherland Model
Using the ideas of supersymmetry and shape invariance we re-derive the spectrum of the AN-1 and BCN Calogero-Sutherland model. We briefly discuss as to how to obtain the corresponding…
Pijush K. Ghosh, Avinash Khare, M. SivakumarOct 20, 1997
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Tunneling with dissipation in open quantum systems
Based on the general form of the master equation for open quantum systems the tunneling is considered. Using the path integral technique a simple closed form expression for the tunneling rate through…
G. G. Adamian, N. V. Antonenko, W. ScheidOct 18, 1997
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Simulated Annealing with Tsallis Weights - A Numerical Comparison
We discuss the use of Tsallis generalized mechanics in simulated annealing algorithms. For a small peptide it is shown that older implementations are not more effective than regular simulated…
Ulrich H. E. HansmannOct 18, 1997
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Interference of a first-order transition with the formation of a spin-Peierls state in alpha'-NaV2O5?
We present results of high-resolution thermal-expansion and specific-heat measurements on single crystalline alpha'-NaV2O5. We find clear evidence for two almost degenerate phase transitions…
M. Koeppen, D. Pankert, R. Hauptmann et al.Oct 17, 1997
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