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Condensed Matter papers — page 107

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Spectral ergodicity and normal modes in ensembles of sparse matrices
We investigate the properties of sparse matrix ensembles with particular regard for the spectral ergodicity hypothesis, which claims the identity of ensemble and spectral averages of spectral…
A. D. Jackson, C. Mejia-Monasterio, T. Rupp et al.Sep 21, 2000
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Incommensurate Spin-Peierls Phases in the One-Dimensional Quantum Isotropic XY Model
Using the numerical approach for a study of the thermodynamic properties of the nonuniform one-dimensional spin-1/2 isotropic XY model in a transverse field we examine different lattice distortions…
Oleg Derzhko, Taras KrokhmalskiiSep 21, 2000
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Edge Singularity for the Optically Induced Kondo Effect in a Quantum Dot
We analyze the optically induced Kondo effect in the absorption spectrum for a quantum dot with an even number of electrons, for which the Kondo effect does not occur in the ground state. The Kondo…
T. Fujii, A. Furusaki, N. Kawakami et al.Sep 21, 2000
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A supersymmetric mean-field approach to the infinite-U Hubbard model
A generalized supersymmetric representation of the Hubbard operator algebra is considered. This representation is applied to the infinite-U Hubbard model. A mean-field theory which takes into account…
V. Yu. Irkhin, A. A. KataninSep 21, 2000
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Frequency Dependent Viscosity Near the Critical Point: The Scale to Two Loop Order
The recent accurate measurements of Berg, Moldover and Zimmerli of the viscoelastic effect near the critical point of xenon has shown that the scale factor involved in the frequency scaling is about…
Palash Das, Jayanta. K. BhattacharjeeSep 20, 2000
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Intermittent Switching between Potential Flow and Turbulence in Superfluid Helium at mK Temperatures
Superfluid flow around an oscillating microsphere is investigated at temperatures down to 25 mK. Stable laminar flow below a critical velocity and turbulence at large drives are found to be separated…
Michael Niemetz, Hubert Kerscher, Wilfried SchoepeSep 20, 2000
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Strongly Non-Equilibrium Bose-Einstein Condensation in a Trapped Gas
We present a qualitative (and quantitative, at the level of estimates) analysis of the ordering kinetics in a strongly non-equilibrium state of a weakly interacting Bose gas, trapped with an external…
Boris SvistunovSep 20, 2000
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Dislocation-Mediated Melting: The One-Component Plasma Limit
The melting parameter Γm of a classical one-component plasma is estimated using a relation between melting temperature, density, shear modulus, and crystal coordination number that follows from…
Leonid Burakovsky, Dean L. PrestonSep 19, 2000
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Two-Fluid Hydrodynamics in Trapped Bose Gases and in Superfluid Helium
A review is given of recent theoretical work on the superfluid dynamics of trapped Bose gases at finite temperatures, where there is a significant fraction of non-condensate atoms. One can now reach…
Allan Griffin, Tetsuro NikuniSep 19, 2000
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Effect of a forbidden site on a d-dimensional lattice random walk
We study the effect of a single excluded site on the diffusion of a particle undergoing random walk in a d-dimensional lattice. The determination of the characteristic function allows to find…
Nicolas Martzel, Claude AslangulSep 19, 2000
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Correlation Functions and Corner Transfer Matrix of the Chiral Potts Model
We use the Density Matrix Renormalization Group technique to compute correlation functions of the Z3-chiral Potts quantum chain in the massive regimes. Chains of up to 70 sites are used and a clear…
C. Ritter, G. von GehlenSep 18, 2000
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Sympatric speciation: compliance with phenotype diversification from a single genotype
A novel mechanism for sympatric speciation that takes into account complex bio-processes within each individual organism is proposed. According to dynamical systems theory, organisms with identical…
Kunihiko Kaneko, Tetsuya YomoSep 18, 2000
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Electronic transport in strongly anisotropic disordered systems: model for the random matrix theory with non-integer beta
We study numerically an electronic transport in strongly anisotropic weakly disorderd two-dimensional systems. We find that the conductance distribution is gaussian but the conductance fluctuations…
Peter MarkosSep 17, 2000
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Comment on the intermediate vortex liquid phase in extreme type-II superconductors
It is shown that disentangled vortex liquid can be a true thermodynamic phase of type-II superconductors in spite of the absense of supercurrent in the direction parallel to the magnetic field.
M. V. Feigel'manSep 16, 2000
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"Barber pole turbulence" in large aspect ratio Taylor-Couette flow
Investigations of counter-rotating Taylor-Couette flow (TCF) in the narrow gap limit are conducted in a very large aspect ratio apparatus. The phase diagram is presented and compared to that obtained…
A. Prigent, O. DauchotSep 15, 2000
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Quantum corrections to the ground state energy of a trapped Bose-Einstein condensate: A diffusion Monte Carlo calculation
The diffusion Monte Carlo method is applied to describe a trapped atomic Bose-Einstein condensate at zero temperature, fully quantum mechanically and nonperturbatively. For low densities, $n(0)a3…
D. Blume, Chris H. GreeneSep 14, 2000
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Renormalization Group and Probability Theory
The renormalization group has played an important role in the physics of the second half of the twentieth century both as a conceptual and a calculational tool. In particular it provided the key…
Giovanni Jona-LasinioSep 14, 2000
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Discrete breathers in classical spin lattices
Discrete breathers (nonlinear localised modes) have been shown to exist in various nonlinear Hamiltonian lattice systems. In the present paper we study the dynamics of classical spins interacting via…
Y. Zolotaryuk, S. Flach, V. FleurovSep 14, 2000
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Distance-depending electron-phonon interactions from one- and two-body electronic terms in a dimer
For a dimer with a non-degenerate orbital built from atomic wave functions of Gaussian shape we evaluate all the electron-phonon couplings derived from the one-body and two-body electronic…
M. Acquarone, C. NoceSep 14, 2000
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2D XY Ordering in Striped Cu-O Planes in Underdoped Bi-2212
It was discussed the possibility of determination of 2D XY ordering temperature (Berezinskii-Kosterlitz-Thouless temperature) in striped Cu-O planes for quasi-two dimensional HTS with the…
G. G. SergeevaSep 14, 2000
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Collisional damping of the collective oscillations of a trapped Fermi gas
We consider a Fermi gas confined by a harmonic trapping potential and we highlight the role of the Fermi-Dirac statistics by studying frequency and damping of collective oscillations of quadrupole…
L. VichiSep 14, 2000
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Non-extensivity Effects and the Highest Energy Cosmic Ray Affair
Recent measurements of the cosmic microwave background confirm that it is described by a Planckian distribution with high precision. It is non-extensivity bounded to be less than some parts in…
Luis A. Anchordoqui, Diego F. TorresSep 13, 2000
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Analysis of Vocal Disorders in a Feature Space
This paper provides a way to classify vocal disorders for clinical applications. This goal is achieved by means of geometric signal separation in a feature space. Typical quantities from chaos theory…
Lorenzo Matassini, Rainer Hegger, Holger Kantz et al.Sep 13, 2000
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Shape deformations and angular momentum transfer in trapped Bose-Einstein condensates
Angular momentum can be transferred to a trapped Bose-Einstein condensate by distorting its shape with an external rotating field, provided the rotational frequency is larger than a critical…
F. Dalfovo, S. StringariSep 13, 2000
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Gravity-induced Wannier-Stark ladder in an optical lattice
We discuss the dynamics of ultracold atoms in an optical potential accelerated by gravity. The positions and widths of the Wannier-Stark ladder of resonances are obtained as metastable states. The…
J. Zapata, A. M. Guzman, M. G. Moore et al.Sep 12, 2000
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