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Condensed Matter papers — page 97

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Rigorous approach to the problem of ultraviolet divergencies in dilute Bose gases
We have found an expression for the full many-body Green's function of N pairwise finite-range interacting atoms, in a form of a chain fraction involving two-body T-matrices only, with no…
Maxim Olshanii, Ludovic PricoupenkoJan 18, 2001
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Relativistic solution of Iordanskii problem in multi-constituent superfluid mechanics
Flow past a line vortex in a simple perfect fluid or superfluid gives rise to a transverse Magnus force that is given by the well known Joukowski lift formula. The problem of generalising this to…
Brandon Carter, David Langlois, Reinhard PrixJan 18, 2001
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Disordered Hubbard Model with Attraction: Coupling Energy of Cooper Pairs in Small Clusters
We generalize the Cooper problem to the case of many interacting particles in the vicinity of the Fermi level in the presence of disorder. On the basis of this approach we study numerically the…
J. Lages, G. Benenti, D. L. ShepelyanskyJan 17, 2001
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A simple solid-on-solid model of epitaxial film growth: submonolayer substrate coverage
In this work we investigate influence of substrate temperature on the surface morphology for substrate coverage below one monolayer. The model of film growth is based on random deposition enriched by…
K. MalarzJan 16, 2001
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Spin dynamics of the model 2D quantum antiferromagnet CFTD
The magnetic excitation spectrum in the two-dimensional (2D) S=1/2 Heisenberg antiferromagnet copper deuteroformate tetradeuterate (CFTD) has been measured for temperatures up to T J/2, where…
H. M. Ronnow, D. F. McMorrow, R. Coldea et al.Jan 16, 2001
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Low Temperature Magnetothermodynamics of Pr0.7Ca0.3MnO3
We present a detailed magnetothermal study of Pr0.7Ca0.3MnO3, a perovskite manganite in which an insulator-metal transition can be driven by magnetic field, but also by pressure,…
M. Roy, J. F. Mitchell, A. P. Ramirez et al.Jan 16, 2001
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The leverage effect in financial markets: retarded volatility and market panic
We investigate quantitatively the so-called leverage effect, which corresponds to a negative correlation between past returns and future volatility. For individual stocks, this correlation is…
Jean-Philippe Bouchaud, Andrew Matacz, Marc PottersJan 16, 2001
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p-species integrable reaction-diffusion processes
We consider a process in which there are p-species of particles, i.e. A1,A2,...,Ap, on an infinite one-dimensional lattice. Each particle Ai can diffuse to its right neighboring site with rate…
M. Alimohammadi, N. AhmadiJan 13, 2001
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Superfluid-spiral state of quantum ferrimagnets in magnetic field
We study the phase diagram of one-dimensional quantum ferrimagnets by using a numerical exact diagonalization of a finite size system along with a field-theoretical non-linear σ model of the…
M. Abolfath, A. LangariJan 12, 2001
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Jordan-Wigner fermionization for spin-1/2 systems in two dimensions: A brief review
We review the papers on the Jordan-Wigner transformation in two dimensions to comment on a possibility of examining the statistical mechanics properties of two-dimensional spin-1/2 models. We discuss…
Oleg DerzhkoJan 12, 2001
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Dynamic Drop Models
We follow the dynamic evolution of a cluster of Ising spins pointing up surrounded by other spins pointing down, on a lattice. The cluster represents a liquid drop. Under a microscopic point of view,…
P. M. C. de Oliveira, T. J. P. Penna, A. R. Lima et al.Jan 12, 2001
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Variational study of the Holstein polaron
The paper deals with the ground and the first excited state of the polaron in the one dimensional Holstein model. Various variational methods are used to investigate both the weak coupling and strong…
O. S. BarisicJan 11, 2001
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Distribution of Traffic Penalties in Rio de Janeiro
Brazilian drivers caught in traffic violations accumulate points in their official personal files. Here, we analyse the distribution probability of these data, for the state of Rio de Janeiro, where…
Rafaella A. Nobrega, Cricia C. Rodegheri, Renato C. PovoasJan 11, 2001
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Broad Histogram: Tests for a Simple and Efficient Microcanonical Simulator
The Broad Histogram Method (BHM) allows one to determine the energy degeneracy g(E), i.e. the energy spectrum of a given system, from the knowledge of the microcanonical averages <Nup(E)> and…
Paulo Murilo Castro de OliveiraJan 11, 2001
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Why do Evolutionary Systems Stick to the Edge of Chaos
The long-term behaviour of dynamic systems can be classified in two different regimes, regular or chaotic, depending on the values of the control parameters, which are kept constant during the time…
Paulo Murilo Castro de OliveiraJan 11, 2001
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To Phenomenological Theory of Superfluidity. Superfluidity - Viscousless Flow in Viscous Medium
Despite of remarkable successes the theory of superfluidity, until now we have no a physical explanation of an opportunity of existence of viscousless flow of liquid helium in viscous medium. The…
Yu. L. KlimontovichJan 11, 2001
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Surface Phase Diagrams for Wetting on Heterogenous Substrates
We propose a simplified description of fluid adsorption on heterogenenous micropatterned substrates. Using this approach, we are able to rederive results obtained earlier using effective interfacial…
C. Rascon, A. O. ParryJan 10, 2001
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Soliton dynamics in 3D ferromagnets
We study the dynamics of solitons in a Landau-Lifshitz equation describing the magnetization of a three-dimensional ferromagnet with an easy axis anisotropy. We numerically compute the energy…
Theodora Ioannidou, Paul SutcliffeJan 10, 2001
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A superfluid gyroscope with cold atomic gases
A trapped Bose-Einstein condensed atomic gas containing a quantized vortex is predicted to exhibit precession after a sudden rotation of the confining potential. The equations describing the motion…
S. StringariJan 9, 2001
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Critical dynamics of a spin-5/2 2D isotropic antiferromagnet
We report a neutron scattering study of the dynamic spin correlations in Rb2MnF4, a two-dimensional spin-5/2 antiferromagnet. By tuning an external magnetic field to the value for the spin-flop…
R. J. Christianson, R. L. Leheny, R. J. Birgeneau et al.Jan 8, 2001
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Vertically coupled quantum dots in the local spin-density functional theory
We have investigated the structure of double quantum dots vertically coupled at zero magnetic field within local spin-density functional theory. The dots are identical and have a finite width, and…
Marti Pi, Agusti Emperador, Manuel Barranco et al.Jan 8, 2001
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Direct Quantization of Open Dissipative Systems
Open, dissipative systems subject to a random force are directly quantized. The starting point is the effective action derived using the method of Parisi-Sourlas. Since the effective action is…
Jose A. MagpantayJan 8, 2001
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Total Polarisation Conversion in Two-dimensional Electron System under Cyclotron Resonance Conditions
The polarisation conversion of a linear polarised electromagnetic wave incident onto a two-dimensional (2D) electron system at an angle is theoretically studied. We consider the 2D system located at…
V. V. Popov, T. V. TeperikJan 6, 2001
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Uniting Bose-Einstein condensates in optical resonators
The relative phase of two initially independent Bose-Einstein condensates can be laser cooled to unite the two condensates by putting them into a ring cavity and coupling them with an internal…
D. Jaksch, S. A. Gardiner, K. Schulze et al.Jan 5, 2001
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Magneto-photoluminescence of GaN/AlGaN quantum wells: valence band reordering and excitonic binding energies
A re-ordered valence band in GaN/AlGaN quantum wells with respect to GaN epilayers has been found as a result of the observation of an enhanced g-factor in magneto-luminescence spectra in fields up…
P. A. Shields, R. J. Nicholas, N. Grandjean et al.Jan 5, 2001
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