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Condensed Matter papers — page 112

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Scaling of transition temerature and CuO2 plane buckling in the cuprate superconductors
Recently it is seenNature,that both Tc and the buckling of the CuO2 planes goes through a maximum at the same doping level. We show that only for optimal doping concentration the…
Manas Sardar, Satadeep BhattacharjeeJul 7, 2000
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Stability of stationary states in the cubic nonlinear Schroedinger equation: applications to the Bose-Einstein condensate
The stability properties and perturbation-induced dynamics of the full set of stationary states of the nonlinear Schroedinger equation are investigated numerically in two physical contexts: periodic…
Lincoln D. Carr, J. Nathan Kutz, William P. ReinhardtJul 6, 2000
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Turbulence for (and by) amateurs
Series of lectures on statistical turbulence written for amateurs but not experts. Elementary aspects and problems of turbulence in two and three dimensional Navier-Stokes equation are introduced. A…
Denis BernardJul 6, 2000
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Multispecies reaction-diffusion systems
Multispecies reaction-diffusion systems, for which the time evolution equation of correlation functions become a closed set, are considered. A formal solution for the average densities is found. Some…
A. Aghamohammadi, A. H. Fatollahi, M. Khorrami et al.Jul 6, 2000
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Dynamics of two colliding Bose-Einstein condensates in an elongated magneto-static trap
We study the dynamics of two interacting Bose-Einstein condensates, by numerically solving two coupled Gross-Pitaevskii equations at zero temperature. We consider the case of a sudden transfer of…
M. Modugno, F. Dalfovo, C. Fort et al.Jul 6, 2000
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Thermodynamical implications of a protein model with water interactions
We refine a protein model that reproduces fundamental aspects of protein thermodynamics. The model exhibits two transitions, hot and cold unfolding. The number of relevant parameters is reduced to…
Audun Bakk, Johan S. Hoye, Alex Hansen et al.Jul 5, 2000
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Hydrodynamic approach to TDDFT; response properties of metal clusters
Performing electronic structure calculations for large systems, such as nanoparticles or metal clusters, via orbital based Hartree-Fock or Kohn-Sham theories is computationaly demanding. To study…
Arup Banerjee, Manoj K. HarbolaJul 5, 2000
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Geometric Phases and Multiple Degeneracies in Harmonic Resonators
In a recent experiment Lauber et al. have deformed cyclically a microwave resonator and have measured the adiabatic normal-mode wavefunctions for each shape along the path of deformation. The…
F. Pistolesi, Nicola ManiniJul 4, 2000
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Comment on "Models of Intermediate Spectral Statistics"
In [1] it was proposed, that the nearest-neighbor distribution P(s) of the spectrum of the Bohr-Mottelson model is similar to the semi-Poisson distribution. We show however, that P(s) of this…
T. Gorin, M. Mueller, P. SebaJul 3, 2000
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Off equilibrium magnetic properties in a model for vortices in superconductors
We study the properties of a simple lattice model of repulsive particles diffusing in a pinning landscape. The behaviour of the model is very similar to the observed physics of vortices in…
Mario Nicodemi, Henrik Jeldtoft JensenJul 3, 2000
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Piezoelectricity and Piezomagnetism : Duality in Two-Dimensional Checkerboards
The duality approach in 2- dim two-component regular checkerboards was extended onto piezoelectricity and piezomagnetism problems. There are found a relation for effective piezoelectric and…
Leonid G. FelJul 3, 2000
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Isotropic Conductivity of Two-Dimensional Three-Component Symmetric Composites
The effective dc-conductivity problem of isotropic, two-dimensional (2D), three-component, symmetric, regular composites is considered. A simple cubic equation with one free parameter for…
Leonid G. Fel, Vladimir Sh. Machavariani, David J. BergmanJul 3, 2000
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Distinguishing fractional and white noise in one and two dimensions
We discuss the link between uncorrelated noise and Hurst exponent for one and two-dimensional interfaces. We show that long range correlations cannot be observed using one-dimensional cuts through…
Alex Hansen, Jean Schmittbuhl, George BatrouniJul 2, 2000
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Low-Lying Excitations from the Yrast Line of Weakly Interacting Trapped Bosons
Through an extensive numerical study, we find that the low-lying, quasi-degenerate eigenenergies of weakly-interacting trapped N bosons with total angular momentum L are given in case of small L/N…
Tatsuya Nakajima, Masahito UedaJul 1, 2000
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Quenching and Annealing in the Minority Game
We report the occurrence of quenching and annealing in a version of the Minority Game (MG) in which the winning option is to join a given fraction of the population that is a free, external…
E. Burgos, Horacio Ceva, R. P. J. PerazzoJul 1, 2000
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Off equilibrium properties of vortex creep in superconductors
We study a model for the dynamics of vortices in type II superconductors. In particular, we discuss glassy ``off equilibrium'' properties and ``aging'' in magnetic creep. At low…
Henrik Jeldtoft Jensen, Mario NicodemiJun 30, 2000
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Random Matrix approach to the crossover from Wigner to Poisson statistics of energy levels
We analyze a class of parametrized Random Matrix models, introduced by Rosenzweig and Porter, which is expected to describe the energy level statistics of quantum systems whose classical dynamics…
Nilanjana Datta, Herve KunzJun 30, 2000
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Coexistence of charge density waves, bond order waves and spin density waves in quasi-one dimensional charge transfer salts
Charge, spin, as well as lattice instabilities are investigated in isolated or weakly coupled chains of correlated electrons at quarter-filling. Our analysis is based on extended Hubbard models…
Jose Riera, Didier PoilblancJun 29, 2000
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Crossover behavior in He3 and Xe near their liquid-vapor critical point
We present a detailed discussion of the crossover from mean-field to Ising critical behavior upon approach of the critical point, both for He3 and Xe. By combining different sets of experimental…
Erik Luijten, Horst MeyerJun 29, 2000
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Solving the phase problem in i(AlPdMn)
We apply a new technique for ab initio phase determination [Acta Crystallogr. Sect. A, A55, 48 (1999)] to solve for the average structure of the icosahedral (i) phase of AlPdMn. After an introduction…
K. S. Brown, A. A. Avanesov, V. ElserJun 29, 2000
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Liquid-Solid Phase Transition of the System with Two particles in a Rectangular Box
We study the statistical properties of two hard spheres in a two dimensional rectangular box. In this system, the relation like Van der Waals equation loop is obtained between the width of the box…
Akinori AwazuJun 29, 2000
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Projecting the Kondo Effect: Theory of the Quantum Mirage
A microscopic theory is developed for the projection (quantum mirage) of the Kondo resonance from one focus of an elliptic quantum corral to the other focus. The quantum mirage is shown to be…
Oded Agam, Avraham SchillerJun 28, 2000
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Theory of interlayer tunneling in bi-layer quantum Hall ferromagnets
Spielman et al. have recently observed a large zero-bias peak in the tunnel conductance of a bi-layer system in a quantum Hall ferromagnet state. We argue that disorder-induced topological defects in…
Ady Stern, S. M. Girvin, A. H. MacDonald et al.Jun 28, 2000
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Quantum Poincare' recurrences in microwave ionization of Rydberg atoms
We study the time dependence of the ionization probability of Rydberg atoms driven by a microwave field. The quantum survival probability follows the classical one up to the Heisenberg time and then…
Giuliano Benenti, Giulio CasatiJun 28, 2000
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Parametric Simultons in Nonlinear Lattices
Parametric simultaneous solitary wave (simulton) excitations are shown possible in nonlinear lattices. Taking a one-dimensional diatomic lattice with a cubic potential as an example we consider the…
Bambi Hu, Guoxiang HuangJun 28, 2000
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