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Condensed Matter papers — page 144

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Molecular dynamics study of a classical two-dimensional electron system: Positional and orientational orders
Molecular dynamics simulation is used to investigate the crystallization of a classical two-dimensional electron system, in which electrons interact with the Coulomb repulsion. From the positional…
Satoru Muto, Hideo AokiJun 15, 1999
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Internal Spatiotemporal Stochastic Resonance in a Microscopic Surface Reaction Model
We show the existence of internal stochastic resonance in a microscopic stochastic model for the oscillating CO oxidation on single crystal surfaces. This stochastic resonance arises directly from…
O. Kortlüke, V. N. Kuzovkov, W. von NiessenJun 15, 1999
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Temperature-induced resonances and Landau damping of collective modes in Bose-Einstein condensed gases in spherical traps
Interaction between collective monopole oscillations of a trapped Bose-Einstein condensate and thermal excitations is investigated by means of perturbation theory. We assume spherical symmetry to…
M. Guilleumas, L. P. PitaevskiiJun 15, 1999
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Force fluctuations in granular materials
Force fluctuations in granular materials are investigated. A continuum equation is derived starting from a discrete model proposed in the literature. The influence of boundary conditions is…
Alexei Vazquez, Jose Marin-Antuña, O. Sotolongo-CostaJun 15, 1999
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Universality classes in the random-storage sandpile model
The avalanche statistics in a stochastic sandpile model where toppling takes place with a probability p is investigated. The limiting case p=1 corresponds to the Bak-Tang-Wiesenfeld (BTW) model with…
Alexei Vazquez, O. Sotolongo-CostaJun 15, 1999
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Large transverse field tunnel splittings in the Fe8 spin Hamiltonian
The spin Hamiltonian that describes the molecular magnet Fe8 has biaxial symmetry with mutually perpendicular easy, medium, and hard magnetic axes. Previous calculations of the ground state tunnel…
Anupam GargJun 14, 1999
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Quantum cavitation in liquid 3He: dissipation effects
We have investigated the effect that dissipation may have on the cavitation process in normal liquid 3He. Our results indicate that a rather small dissipation decreases sizeably the…
Dora M. Jezek, Marti Pi, Manuel BarrancoJun 14, 1999
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Universal property of single topological singularity dynamics
Using the random matrix theory we demonstrate explicitly the insensitivity of the transverse force on a moving vortex to non-intrinsic and non-magnetic impurities in a superconductor.
P. Ao, X. -M. ZhuJun 14, 1999
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K S Krishnan and the early experimental evidences for the Jahn-Teller Theorem
Jahn-Teller theorem, proposed in 1937, predicts a distortional instability for a molecule that has symmetry based degenerate electronic states. In 1939 Krishnan emphasized the importance of this…
G. BaskaranJun 13, 1999
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Where are we in the theory of High Temperature Superconductors ?
In this talk I will briefly review our present theoretical understanding of some of the important issues in the high Tc cuprates. In view of its success, at a qualitative level and some times…
G. BaskaranJun 13, 1999
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Screening of the Photon Field in Surface Photoemission from Simple Metals
A previous two-step hydrodynamic model calculation of angle-resolved photoemission has been improved by modeling the surface with a soft analytic function. The same ground-state potential is used to…
S. Natschlaeger, J. Alberich, N. Barberan et al.Jun 11, 1999
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Induced spin polarisation in a ferromagnetic gadolinium-yttrium alloy
The first direct evidence of an induced spin moment in Gd(62.4)Y(37.6) is presented. This additional moment, of 0.16 +/- 0.03 Bohr magnetons, arises from polarisation of Y electrons in the alloy. The…
J. A. Duffy, S. B. Dugdale, J. E. McCarthy et al.Jun 11, 1999
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Output from an atom laser: theory vs. experiment
Atom lasers based on rf-outcoupling can be described by a set of coupled generalized Gross-Pitaevskii equations (GPE). We compare the theoretical predictions obtained by numerically integrating the…
Jens Schneider, Axel SchenzleJun 11, 1999
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Modeling Premartensitic effects in Ni2MnGa: A Mean Field and Monte Carlo Simulation Study
The degenerate Blume-Emery-Griffiths model for martensitic transformations is extended by including both structural and magnetic degrees of freedom in order to elucidate premartensitic effects.…
Teresa Castan, Eduard Vives, Per-Anker LindgaardJun 11, 1999
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Bose-Einstein condensates with vortices in rotating traps
We investigate minimal energy solutions with vortices for an interacting Bose-Einstein condensate in a rotating trap. The atoms are strongly confined along the axis of rotation z, leading to an…
Y. Castin, R. DumJun 10, 1999
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A Maximum Entropy Method of Obtaining Thermodynamic Properties from Quantum Monte Carlo Simulations
We describe a novel method to obtain thermodynamic properties of quantum systems using Baysian Inference -- Maximum Entropy techniques. The method is applicable to energy values sampled at a discrete…
Carey Huscroft, Richard Gass, Mark JarrellJun 10, 1999
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The critical exponents of fracture precursors
The acoustic emission of fracture precursors is measured in heterogeneous materials. The statistical behaviour of these precursors is studied as a function of the load features and the geometry. We…
A. Guarino, R. Scorretti, S. Ciliberto et al.Jun 10, 1999
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Diamagnetic Susceptibility and Current Distributions in Granular Superconductors at Percolation
Comments: 4 pages RevTeX, 4 Postscript figures. References added. We study a two-dimensional granular superconducting network at the percolation threshold under the influence of an external…
Henning A. Knudsen, Alex HansenJun 9, 1999
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Impurity scattering and frequency dependent conductivity in spin density waves
The quasiparticle contribution to the frequency dependent electric conductivity in the presence of randomly distributed impurities is calculated within mean field theory for spin density waves as…
Attila Virosztek, Balazs Dora, Kazumi MakiJun 9, 1999
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Stripe Structures and the Berry-Phase Connection: Concept of Geometric Energy
Electronic states of an eg electron are calculated in the system composed of two MnO6 octahedra with the inclusion of the Berry phase acquired by parallel transport. Based on this calculation,…
Yasutami Takada, Takashi Hotta, Hiroyasu KoizumiJun 9, 1999
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Theory and Satellite Experiment for Critical Exponent alpha of lambda-Transition in Superfluid Helium
On the basis recent seven-loop perturbation expansion for nu-1 = 3/(2 - alpha) we perform a careful reinvestigation of the critical exponent alpha governing the power behavior |Tc-T|- alpha of…
Hagen KleinertJun 8, 1999
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Breakup of a Dimer: a New Approach to Localization Transition
Within the framework of tight binding models, aperiodic systems are mapped to a renormalized lattice with a dimer defect. In models exhibiting metal-insulator transition, the dimer acts like a…
Ignacio Gomez, Indubala I. SatijaJun 8, 1999
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Predicting Financial Crashes Using Discrete Scale Invariance
We present a synthesis of all the available empirical evidence in the light of recent theoretical developments for the existence of characteristic log-periodic signatures of growing bubbles in a…
Anders Johansen, Didier Sornette, Olivier LedoitJun 8, 1999
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Charge-order transition in the extended Hubbard model on a two-leg ladder
We investigate the charge-order transition at zero temperature in a two-leg Hubbard ladder with additional nearest-neighbor Coulomb repulsion V using the Density Matrix Renormalization Group…
Matthias Vojta, R. E. Hetzel, R. M. NoackJun 7, 1999
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Spectral Properties of Random Reactance Networks and Random Matrix Pencils
Our goal is to study statistical properies of "dielectric resonances" which are poles of conductance of a large random LC network. Such poles are a particular example of eigenvalues λn…
Yan V. FyodorovJun 6, 1999
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