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Condensed Matter papers — page 167

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Polymer Chain Orientations in KC60 and RbC60 : Structural Analysis and Relation with Electronic Properties
First single crystal X-ray diffraction studies of polymerized KC60 and RbC60 are presented. While powder diffraction studies showed no definite structural differences, the single crystal diffraction…
P. Launois, R. Moret, E. Llusca et al.Sep 24, 1998
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Evidence for distinct polymer chain orientations in KC60 and RbC60
The KC60 and RbC60 polymer phases exhibit contrasting electronic properties while powder diffraction studies have revealed no definite structural difference. We have performed single crystal X-ray…
P. Launois, R. Moret, J. Hone et al.Sep 24, 1998
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Analytic Scaling Functions Applicable to Dispersion Measurements
Scaling functions, F+(ω/ωc+) and F-(ω/ωc-) for ϕ>ϕc and ϕ<ϕc, respectively, are derived from an equation for the complex conductivity of binary conductor-insulator composites. It is…
D. S. McLachlan, W. D. Heiss, C. Chiteme et al.Sep 23, 1998
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Scaling properties of the cluster distribution of a critical nonequilibrium model
A geometric approach to critical fluctuations of a nonequilibrium model is reported. The two-dimensional majority vote model was investigated by Monte Carlo simulations on square lattices of various…
Marta Chaves, Maria Augusta SantosSep 22, 1998
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Localization length of a soliton from a non-magnetic impurity in a general double-spin-chain model
A localization length of a free-spin soliton from a non-magnetic impurity is deduced in a general double-spin-chain model (J0-J1-J2-J3 model). We have solved a variational problem which employs…
Tota NakamuraSep 22, 1998
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Perturbations of Noise: The origins of Isothermal Flows
We make a detailed analysis of both phenomenological and analytic background for the "Brownian recoil principle" hypothesis (Phys. Rev. A 46, (1992), 4634). A corresponding theory of the…
Piotr GarbaczewskiSep 22, 1998
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Quantum vortex creep :Hall and dissipative tunneling
Within the framework of the path-integral approach we study the quantum vortex creep for the situation where both the Hall and the dissipative dynamics are simultaneously present. We calculate the…
Gwang-Hee Kim, Mincheol ShinSep 22, 1998
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The Contribution of the Smectic-Nematic Interface to the Surface Energy
The contribution of the smectic-nematic interface to the surface energy of a nematic liquid crystal sample is analyzed. By means of a simple model it is shown that the surface energy depends on the…
L. R. Evangelista, S. Fontanini, L. C. Malacarne et al.Sep 21, 1998
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Origin of Hall Anomaly in the Mixed State
There has been a corporative absence of understanding of Hall anomaly data in the mixed state in terms of vortex many-body effect and pinning, because of the dominant theoretical influence. Now…
P. AoSep 21, 1998
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Compact support probability distributions in random matrix theory
We consider a generalization of the fixed and bounded trace ensembles introduced by Bronk and Rosenzweig up to an arbitrary polynomial potential. In the large-N limit we prove that the two are…
G. Akemann, G. M. Cicuta, L. Molinari et al.Sep 21, 1998
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Heisenberg Spins on an Elastic Torus Section
Classical Heisenberg spins in the continuum limit (i.e. the nonlinear sigma-model) are studied on an elastic torus section with homogeneous boundary conditions. The corresponding rigid model exhibits…
Jerome Benoit, Rossen DandoloffSep 20, 1998
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Magnetic Raman Scattering of Insulating Cuprates
We study the B1g and A1g Raman profiles of M2CuO4 (with M= La, Pr, Nd, Sm, Gd), Bi2Sr2Ca0.5Y0.5Cu2O8+y%, YBa2Cu3O6.2 and…
J. M. Eroles, C. D. Batista, S. B. Bacci et al.Sep 18, 1998
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Conductance of carbon nanotubes with disorder: A numerical study
We study the conductance of carbon nanotube wires in the presence of disorder, in the limit of phase coherent transport. For this purpose, we have developed a simple numerical procedure to compute…
M. P. Anantram, T. R. GovindanSep 18, 1998
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Hopping-disorder-induced effects upon the two-Magnon Raman Scattering spectrum in an Antiferromagnet
Two-magnon Raman scattering intensity is obtained for two-dimensional spin-1/2 antiferromagnets in presence of hopping disorder. A consistent mode assignment scheme is prescribed which essentially…
Saurabh BasuSep 18, 1998
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Multi-step Bose-Einstein Condensation of Trapped Ideal Bose Gases
The Phenomenon of multi-step Bose-Einstein condensation (BEC) of a finite number of non-interacting bosons in anisotropic traps has been demonstrated by studing the populations on eight subsets of…
Wenji DengSep 17, 1998
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Topological Spectral Correlations in 2D Disordered Systems
It is shown that the tail in the two-level spectral correlation function R(s) for particles on 2D closed disordered surfaces is determined entirely by surface topology: R(s)=-χ/(6π2βs2), where…
Vladimir E. Kravtsov, Vladimir I. YudsonSep 17, 1998
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Light emission from a scanning tunneling microscope: Fully retarded calculation
The light emission rate from a scanning tunneling microscope (STM) scanning a noble metal surface is calculated taking retardation effects into account. As in our previous, non-retarded theory…
Peter JohanssonSep 17, 1998
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Finite Temperature DMRG Investigation of the Spin-Peierls Transition in CuGeO3
We present a numerical study of thermodynamical properties of dimerized frustrated Heisenberg chains down to extremely low temperatures with applications to CuGeO3. A variant of the finite…
A. Klümper, R. Raupach, F. SchönfeldSep 16, 1998
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Stationary states of the Gross-Pitaevskii equation with linear counterpart
We study the stationary solutions of the Gross-Pitaevskii equation that reduce, in the limit of vanishing non-linearity, to the eigenfunctions of the associated Schrödinger equation. By providing…
Roberto D'Agosta, Boris A. Malomed, Carlo PresillaSep 14, 1998
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Binary Bose-Einstein Condensate Mixtures in Weakly and Strongly Segregated Phases
We perform a mean-field study of the binary Bose-Einstein condensate mixtures as a function of the mutual repulsive interaction strength. In the phase segregated regime, we find that there are two…
P. Ao, S. T. ChuiSep 14, 1998
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A multi-species asymmetric exclusion process;steady state and correlation functions on a periodic lattice
By generalizing the algebra of operators of the Asymmetric Simple Exclusion Process (ASEP), a multi-species ASEP in which particles can overtake each other,is defined on both open and closed one…
V. karimipourSep 14, 1998
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Phase Transitions in Condensed Matter and Relativistic QFT
Kibble and Zurek have provided a unifying picture for the onset of phase transitions in relativistic QFT and condensed matter systems respectively, strongly supported by agreement with condensed…
R. J. RiversSep 14, 1998
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Chiral patterns arising from electrostatic growth models
Recently, unusual and strikingly beautiful seahorse-like growth patterns have been observed under conditions of quasi-two-dimensional growth. These `S'-shaped patterns strongly break…
I. M. Sandler, G. S. Canright, H. J. Gao et al.Sep 14, 1998
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Lubricating Bacteria Model for Branching growth of Bacterial Colonies
Various bacterial strains (e.g. strains belonging to the genera Bacillus, Paenibacillus, Serratia and Salmonella) exhibit colonial branching patterns during growth on poor semi-solid substrates.…
Yonathan Kozlovsky, Inon Cohen, Ido Golding et al.Sep 13, 1998
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Energy dependence of mass distributions in fragmentation
We study fragmentation numerically using a simple model in which an object is taken to be a set of particles that interact pairwisely via a Lennard-Jones potential while the effect of the…
Emily S. C. Ching, Y. Y. Yiu, K. F. LoSep 11, 1998
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