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Condensed Matter papers — page 135

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Phase diagram of an exactly solvable t-J ladder model
We study a system of one-dimensional t-J models coupled to a ladder system. A special choice of the interaction between neighbouring rungs leads to an integrable model with supersymmetry, which is…
Holger Frahm, Anjan KunduOct 7, 1999
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Computer simulations of the mechanism of thickness selection in polymer crystals
In this paper I describe the computer simulations that I have performed to critically examine the Lauritzen-Hoffman and the Sadler-Gilmer theories of polymer crystallization. In particular, I have…
Jonathan DoyeOct 7, 1999
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Phase diagram of ferrimagnetic ladders with bond-alternation
We study the phase diagram of a 2-leg bond-alternation spin-(1/2, 1) ladder for two different configurations using a quantum renormalization group approach. Although d-dimensional ferrimagnets show…
A. Langari, M. Abolfath, M. A. Martin-DelgadoOct 7, 1999
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Collisional relaxation in diffuse clouds of trapped bosons
The damping of collective modes and the relaxation of temperature anisotropies in a trapped Bose gas is determined at temperatures above the Bose-Einstein condensation temperature in the…
G. M. Kavoulakis, C. J. Pethick, H. SmithOct 6, 1999
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Trader dynamics in a model market
We explore various extensions of Challet and Zhang's Minority Game in an attempt to gain insight into the dynamics underlying financial markets. First we consider a heterogeneous population where…
Neil F. Johnson, Michael Hart, Pak Ming Hui et al.Oct 6, 1999
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Collective modes in a system with two spin-density waves: the `Ribault' phase of quasi-one-dimensional organic conductors
We study the long-wavelength collective modes in the magnetic-field-induced spin-density-wave (FISDW) phases experimentally observed in organic conductors of the Bechgaard salts family, focusing on…
N. Dupuis, V. M. YakovenkoOct 5, 1999
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Ion-Conducting Polymers - Quenched to Dynamic Disorder
Ion conducting polymers have a biphasic character with crystalline as well as amorphous phases. There is moreover, a dynamic disorder due to motion of polymer chain segments. The PEO-NH4ClO4…
Sarmishtha Mandal, S. Tarafdar, Aninda Jiban BhattacharyyaOct 5, 1999
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Local Non-Fermi Liquid Theory of Magnetic Impurity Effects in Carbon Nanotubes
Magnetic impurity effects in carbon nanotubes are studied theoretically. The multi channel Kondo effect is investigated with the band structure of the metallic nanotubes. The local non-Fermi liquid…
K. HarigayaOct 5, 1999
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Sign Reversal of the Quantum Hall Effect and Helicoidal Magnetic-Field-Induced Spin-Density Waves in Organic Conductors
Within the framework of the quantized nesting model, we study the effect of umklapp scattering on the magnetic-field-induced spin-density-wave (SDW) phases which are experimentally observed in the…
N. Dupuis, V. M. YakovenkoOct 5, 1999
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Analytical Results of the One-Dimensional Hubbard Model in the High Temperature Limit
We investigate the grand potential of the one-dimensional Hubbard model in the high temperature limit, calculating the coefficients of the high temperature expansion (β-expansion) of this function…
I. C. Charret, E. V. Correa Silva, S. M. de Souza et al.Oct 4, 1999
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Hysteretic Response of an Anti-Ferromagnetic Random-Field Ising Model in One Dimension at Zero Temperature
We consider the hysteretic response of a one-dimensional anti-ferromagnetic random-field Ising model at zero temperature for a uniform bounded distribution of quenched random fields, and present…
Prabodh Shukla, Ratnadeep Roy, Emilia RayOct 3, 1999
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The density dependence of the transition temperature in a homogenous Bose flui
Transition temperature data obtained as a function of particle density in the 4He-Vycor system are compared with recent theoretical calculations for 3D Bose condensed systems. In the low density…
J. D. Reppy, B. C. Crooker, B. Hebral et al.Oct 1, 1999
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Microscopic derivation of transport coefficients and boundary conditions in discrete drift-diffusion models of weakly coupled superlattices
A discrete drift-diffusion model is derived from a microscopic sequential tunneling model of charge transport in weakly coupled superlattices provided temperatures are low or high enough. Realistic…
L. L. Bonilla, G. Platero, D. SanchezSep 30, 1999
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Transport in semiconductor superlattices: from quantum kinetics to terahertz-photon detectors
Semiconductor superlattices are interesting for two distinct reasons: the possibility to design their structure (band-width(s),doping, etc.) gives access to a large parameter space where different…
A. P. Jauho, A. Wacker, A. A. IgnatovSep 30, 1999
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Analytic structure factors and pair-correlation functions for the unpolarized homogeneous electron gas
We propose a simple and accurate model for the electron static structure factors (and corresponding pair-correlation functions) of the 3D unpolarized homogeneous electron gas. Our spin-resolved…
Paola Gori-Giorgi, Francesco Sacchetti, Giovanni B. BacheletSep 30, 1999
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Fermion zero modes on vortices in chiral superconductors
The energy levels of the fermions bound to the vortex core are considered for the general case of chiral superconductors. There are two classes of chiral superconductivity: in the superconducting…
G. E. VolovikSep 29, 1999
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Path Integral Monte Carlo Simulations for Fermion Systems: Pairing in the Electron-Hole Plasma
We review the path integral method wherein quantum systems are mapped with Feynman's path integrals onto a classical system of "ring-polymers" and then simulated with the Monte Carlo…
J. Shumway, D. M. CeperleySep 29, 1999
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Stochastic Theory of Foreign Exchange Market Dynamics
A new stochastic theory of a foreign exchange markets dynamics is developed. As a result we have the new probability distribution which well describes statistical and scaling dependencies…
Nikolai LaskinSep 29, 1999
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Magnetic Field Dependent Tunneling in Glasses
We report on experiments giving evidence for quantum effects of electromagnetic flux in barium alumosilicate glass. In contrast to expectation, below 100 mK the dielectric response becomes sensitive…
P. Strehlow, M. Wohlfahrt, A. G. M. Janssen et al.Sep 29, 1999
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Self-organization, resources and strategies in a minority game
We find that the existence of self-organization of the members of a recently proposed minority game, depends on the type of update rules used. The resulting resource distribution is studied in some…
Horacio CevaSep 29, 1999
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Impurity pinning in transport through 1D Mott-Hubbard and spin gap insulators
A low energy crossover (see cond-mat/9711167) induced by Fermi liquid reservoirs in transport through a 1D Mott-Hubbard insulator of finite length L is examined in the presence of impurity pinning.…
Vadim Ponomarenko, Naoto NagaosaSep 29, 1999
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Explaining the Forward Interest Rate Term Structure
We present compelling empirical evidence for a new interpretation of the Forward Rate Curve (FRC) term structure. We find that the average FRC follows a square-root law, with a prefactor related to…
Andrew Matacz, Jean-Philippe BouchaudSep 28, 1999
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Finite-size effects and the stabilized spin-polarized jellium model for metal clusters
In the framework of spherical geometry for jellium and local spin density approximation, we have obtained the equilibrium rs values, rs(N,ζ), of neutral and singly ionized…
M. PayamiSep 27, 1999
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Anomalous anharmonicity in doped cuprate superconductors
Strong nonlinear elastic effects arise due to the Lifshitz transition associated with a change in the Fermi surface topology. It is shown that an electronic contribution to the elastic…
V. Rzhevskii, G. RoepkeSep 27, 1999
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Spectral Line Shape of High-Frequency Local Vibrations in Adsorbed Molecular Lattices
We consider high-frequency local vibrations anharmonically coupled with low-frequency modes in a planar lattice of adsorbed molecules. The effect of lateral intermolecular interactions on the…
I. V. Kuzmenko, V. M. RozenbaumSep 27, 1999
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