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Condensed Matter papers — page 108

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Intrinsic finite-size effects in the two-dimensional XY model with irrational frustration
This study investigates in detail the finite-size scaling of the two-dimensional irrationally frustrated XY model. By means of Monte Carlo simulations with entropic sampling, we examine the size…
Sung Yong Park, M. Y. Choi, Beom Jun Kim et al.Sep 12, 2000
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Finite temperature dynamic structure function of the free Bose gas
A detailed calculation of the finite temperature dynamic structure function of the free Bose gas is presented and discussed. After a short derivation of the expressions describing the exact response…
F. Mazzanti, A. PollsSep 12, 2000
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Phase-separation of binary fluids in shear flow: a numerical study
The phase-separation kinetics of binary fluids in shear flow is studied numerically in the framework of the continuum convection-diffusion equation based on a Ginzburg-Landau free energy. Simulations…
F. Corberi, G. Gonnella, A. LamuraSep 12, 2000
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Magnetic properties of the S=1/2 quasi-one-dimensional antiferromagnet CaCu2O3
We report single crystal growth and magnetic susceptibility and neutron diffraction studies of the S=1/2 quasi-1D antiferromagnet CaCu2O3. The structure of this material is similar to that of the…
V. Kiryukhin, Y. J. Kim, K. J. Thomas et al.Sep 11, 2000
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Incipient nodal pairing in planar d-wave superconductors
The possibility of a second pairing transition d d+is (d+id) in planar d-wave superconductors which occurs in the absence of external magnetic field, magnetic impurities or boundaries…
D. V. Khveshchenko, J. PaaskeSep 8, 2000
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Effective Hamiltonians and dilution effects in kagome and related antiferromagnets
What is the zero-temperature ordering pattern of a Heisenberg antiferromagnet with large spin length S (and possibly small dilution), on the kagome lattice, or others built from corner-sharing…
Christopher L. HenleySep 8, 2000
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Small Cycles in Small Worlds
We characterize the distributions of short cycles in a large metabolic network previously shown to have small world characteristics and a power law degree distribution. Compared with three classes of…
Petra M. Gleiss, Peter F. Stadler, Andreas Wagner et al.Sep 8, 2000
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Boolean derivatives and computation of cellular automata
The derivatives of a Boolean function are defined up to any order. The Taylor and MacLaurin expansions of a Boolean function are thus obtained. The last corresponds to the ring sum expansion (RSE) of…
Franco BagnoliSep 7, 2000
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Analytic verification of the droplet picture in the two-dimensional Ising model
It is widely accepted that the free energy F(H) of the two-dimensional Ising model in the ferromagnetic phase T<Tc has an essential branch cut singularity at the origin H=0. The phenomenological…
S. B. RutkevichSep 7, 2000
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Current Induced Magnetization Switching in Small Domains of Different Anisotropies
Several recent experimental studies have confirmed the possibility of switching the magnetization direction in the small magnetic domains by pumping large spin-polarized currents through them. On the…
Ya. B. Bazaliy, B. A. Jones, Shou-Cheng ZhangSep 4, 2000
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A study of trapped Bose gas beyond mean-field theory
We study the ground-state properties of dilute Bose gas confined to both isotropic and anisotropic traps to assess the accuracy of Gross-Pitaevskii (GP) theory. To go beyond GP approximation we use…
Arup Banerjee, Manoranjan P. SinghSep 2, 2000
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Damped Bogoliubov excitations of a condensate interacting with a static thermal cloud
We calculate the damping of condensate collective excitations at finite temperatures arising from the lack of equilibrium between the condensate and thermal atoms. We neglect the non-condensate…
J. E. Williams, A. GriffinSep 1, 2000
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Fractional vortices in the XY model with π bonds
We define a new set of excitations in the XY model which we call ``fractional vortices''. In the frustrated XY model containing π bonds, we make the ansatz that the ground state…
R. V. Kulkarni, E. Almaas, K. D. Fisher et al.Aug 31, 2000
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Many-body diagrammatic expansion in a Kohn-Sham basis: implications for Time-Dependent Density Functional Theory of excited states
We formulate diagrammatic rules for many-body perturbation theory which uses Kohn-Sham (KS) Green's functions as basic propagators. The diagram technique allows to study the properties of the…
I. V. Tokatly, O. PankratovAug 31, 2000
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Ab Initio Molecular Dynamics Simulation of Liquid GaxAs1-x Alloys
We report the results of ab initio molecular dynamics simulations of liquid GaxAs1-x alloys at five different concentrations, at a temperature of 1600 K, just above the melting point of GaAs. The…
R. V. Kulkarni, D. StroudAug 31, 2000
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EQSE Diagonalization of the Hubbard Model
The application of enhanced quasi-sparse eigenvector methods (EQSE) to the Hubbard model is attempted. The ground state energy for the 4x4 Hubbard model is calculated with a relatively small set of…
Nathan SalwenAug 30, 2000
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Quasi-sparse eigenvector diagonalization and stochastic error correction
We briefly review the diagonalization of quantum Hamiltonians using the quasi-sparse eigenvector (QSE) method. We also introduce the technique of stochastic error correction, which systematically…
Dean LeeAug 30, 2000
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Orientation field model for chiral branching growth of bacterial colonies
We present a new reaction-diffusion model for chiral branching growth of colonies of the bacteria Paenibacillus dendritiformis. In our model the bacteria are represented by a density field with…
Inon Cohen, Eshel Ben-JacobAug 30, 2000
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Percolation, Bose-Einstein Condensation, and String Proliferation
The close analogy between cluster percolation and string proliferation in the context of critical phenomena is studied. Like clusters in percolation theory, closed strings, which can be either…
Adriaan M. J. SchakelAug 30, 2000
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Ultrafast Coulomb-induced dynamics of 2D magnetoexcitons
We study theoretically the ultrafast nonlinear optical response of quantum well excitons in a perpendicular magnetic field. We show that for magnetoexcitons confined to the lowest Landau levels, the…
T. V. Shahbazyan, N. Primozich, I. E. PerakisAug 29, 2000
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Transport Properties near the z=2 Insulator-Superconductor Transition
We consider here the fluctuation conductivity near the point of the insulator-superconductor transition in a system of regular Josephson junction arrays in the presence of particle-hole asymmetry or…
Denis Dalidovich, Philip PhillipsAug 28, 2000
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From market games to real-world markets
This paper uses the development of multi-agent market models to present a unified approach to the joint questions of how financial market movements may be simulated, predicted, and hedged against. We…
P. Jefferies, M. L. Hart, P. M. Hui et al.Aug 28, 2000
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Crowd-Anticrowd Theory of Multi-Agent Market Games
We present a dynamical theory of a multi-agent market game, the so-called Minority Game (MG), based on crowds and anticrowds. The time-averaged version of the dynamical equations provides a…
M. Hart, P. Jefferies, P. M. Hui et al.Aug 25, 2000
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A Model for Addition Spectra in Quantum Dots
A simple model for addition spectra in quantum dots is proposed and studied. It is an extension of the standard charging model which assumes that the charge spreads uniformely over the entire dot.…
Boris ShapiroAug 24, 2000
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Superfluid Hydrodynamics of an Electron Gas in a Superstrong Magnetic Field
We derive the equations of hydrodynamics of a fully polarized electron gas placed in a strong magnetic field. These equations reveal the existence of solitons - immobile or propagating domain…
Eugene B. KolomeiskyAug 24, 2000
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