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Condensed Matter papers — page 106

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Limits on the Curie temperature of (III,Mn)V ferromagnetic semiconductors
Mean-field-theory predicts that the Curie temperature Tc of a (III,Mn)V ferromagnet will be proportional to the valence band density-of-states of its host (III,V) semiconductor, suggesting a route…
John Schliemann, Jürgen König, Hsiu-Hau Lin et al.Oct 2, 2000
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Scaling in a continuous time model for biological aging
In this paper we consider a generalization to the asexual version of the Penna model for biological aging, where we take a continuous time limit. The genotype associated to each individual is an…
R. M. C. de Almeida, G. L. ThomasOct 2, 2000
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Numerical study of persistence in systems with absorbing states
Extensive Monte Carlo simulations are performed in order to evaluate both the local (θl) and global (θg) persistence exponents in the Ziff-Gulari-Barshad (ZGB) (Phy. Rev. Lett. 56,…
Ezequiel Albano, Miguel A. MunozOct 2, 2000
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Heterogeneous condensation on the centers with continuous activity in dynamic conditions
A system with a metastable phase and a pseudo continuous set of the heterogeneous centers is considered. An analytical theory for kinetics of the process of condensation in such a system is…
V. KurasovSep 30, 2000
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Heterogeneous condensation on several types of centers in dynamic conditions
A system of a metastable phase with several sorts of the heterogeneous centers is considered. An analytical theory for the process of condensation in such a system is constructed in dynamic…
V. KurasovSep 30, 2000
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Decay of metastable phase on heterogeneous centers with continuous activity
A system of a metastable phase with a pseudo continuous set of the heterogeneous centers is considered. An analytical theory for kinetics of decay of the metastable phase in such a system is…
V. KurasovSep 30, 2000
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Decay of metastable phase on several types of heterogeneous centers
A system of a metastable phase with several sorts of the heterogeneous centers is considered. An analytical theory for the process of decay in such a system has been constructed. The free energy of…
V. KurasovSep 30, 2000
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A 4He shadow wavefunction with an inverse seventh power particle-particle correlation function
Many ground state studies of 4He using a shadow wave function with an inverse fifth power McMillan particle-particle correlation function have yielded radial distribution functions with misplaced…
Orion Ciftja, Siu A Chin, Francesco PederivaSep 29, 2000
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Single-Block Renormalization Group: Quantum Mechanical Problems
We reformulate the density matrix renormalization group method (DMRG) in terms of a single block, instead of the standard left and right blocks used in the construction of the superblock. This…
M. A. Martin-Delgado, J. Rodriguez-Laguna, G. SierraSep 29, 2000
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Attractive Boson and the Gas-Liquid Condensation
We calculate a grand partition function of the attractive Bose gas in the infinite space within some approximations. Using the idea of the Yang-Lee zeros, it is proved that the gas-liquid…
Shun-ichiro KohSep 29, 2000
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Elastic Response of Rough Surfaces in Partial Contact
We model numerically the partial normal contact of two elastic rough surfaces with highly correlated asperities. Facing surfaces are unmated and described as self-affine with a Hurst exponent H. The…
G. George Batrouni, Alex Hansen, Jean SchmittbuhlSep 29, 2000
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Exact solution of Riemann--Hilbert problem for a correlation function of the XY spin chain
A correlation function of the XY spin chain is studied at zero temperature. This is called the Emptiness Formation Probability (EFP) and is expressed by the Fredholm determinant in the thermodynamic…
Yasuhiro FujiiSep 29, 2000
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Relaxation in kinetic models on alternating linear chains
A restricted dynamics, previously introduced in a kinetic model for relaxation phenomena in linear polymer chains, is used to study the dynamic critical exponent of one-dimensional Ising models. Both…
L. L. Goncalves, M. Lopez de Haro, J. Taguena-MartinezSep 29, 2000
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Landau and Dynamical Instabilities of the Superflow of Bose-Einstein Condensates in Optical Lattices
The superfluidity of Bose-Einstein condensates in optical lattices are investigated. Apart from the usual Landau instability which occurs when a BEC flows faster than the speed of sound, the BEC can…
Biao Wu, Qian NiuSep 28, 2000
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Electronic Ladders with SO(5) Symmetry: Phase Diagrams and Correlations at half-filling
We construct a family of electronic ladder models with SO(5) symmetry which have exact ground states in the form of finitely correlated wave functions. Extensions for these models preserving this…
Holger Frahm, Martin StahlsmeierSep 28, 2000
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Point contact tunneling in the fractional quantum Hall effect: an exact determination of the statistical fluctuations
In the weak backscattering limit, point contact tunneling between quantum Hall edges is well described by a Poissonian process where Laughlin quasiparticles tunnel independently, leading to the…
H. Saleur, U. WeissSep 26, 2000
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Quantized Vorticity in Superfluid 3He-A
Superfluid 3He-A displays the largest variety in vortex structure among the presently known coherent quantum systems. The experimentally verified information comes mostly from NMR measurements on the…
R. Blaauwgeers, V. B. Eltsov, M. Krusius et al.Sep 26, 2000
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Structure of binary Bose-Einstein condensates
We identify all possible classes of solutions for two-component Bose-Einstein condensates (BECs) within the Thomas-Fermi (TF) approximation, and check these results against numerical simulations of…
M. Trippenbach, K. Goral, K. Rzazewski et al.Sep 26, 2000
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Analysis of g2 for the cold-collision frequency shift in the hydrogen condensate experiments
We compute an approximate set of longitudinal quasiparticle modes for a hydrogen condensate as produced in the MIT experiments. An expansion in quasiparticles using a simple one-dimensional…
C. W. Gardiner, A. S. BradleySep 25, 2000
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Kinetics of Strongly Non-Equilibrium Bose-Einstein Condensation
We consider the ordering kinetics in a strongly non-equilibrium state of a (weakly) interacting Bose gas, characterized, on one hand, by large occupation numbers, and, on the other hand, by the…
Boris SvistunovSep 23, 2000
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Scaling Limits for the 2D Metal-Insulator Transition at B = 0 in Si-MOSFETs
We have reexamined data on the possible two dimensional metal-insulator transition at B=0 in Si-MOSFETs using a nonlinear regression method to extract all scaling parameters in a single fit. By…
D. Lilliehook, J. E. FurneauxSep 22, 2000
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Nucleation phenomena in a nonuniform atomic fluid in the electrical field
The density functional approach is used to study the gas-to-liquid and liquid-to-gas nucleation phenomena in a fluid of two-level atoms in an external electrical field. The influence of the field on…
O. V. Derzhko, V. M. MyhalSep 22, 2000
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A new application of reduced Rayleigh equations to electromagnetic wave scattering by two-dimensional randomly rough surfaces
The small perturbations method has been extensively used for waves scattering by rough surfaces. The standard method developped by Rice is difficult to apply when we consider second and third order…
A. Soubret, G. Berginc, C. BourrelySep 21, 2000
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Elastic response of [111]-tunneling impurities
We study the dynamic response of a [111] quantum impurity, such as lithium or cyanide in alkali halides, with respect to an external field coupling to the elastic quadrupole moment. Because of the…
P. Nalbach, O. Terzidis, K. Topp et al.Sep 21, 2000
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Dynamics of spin correlations in the spin-1/2 isotropic XY chain in a transverse field
Dynamic xx spin pair correlation functions for the isotropic spin-1/2 XY chain are calculated numerically for long open chains in the presence of a transverse magnetic field at finite temperature. As…
O. Derzhko, T. Krokhmalskii, J. StolzeSep 21, 2000
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