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Condensed Matter papers — page 136

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The rheology of field-responsive suspensions
We present some aspects of the rheology of field-responsive suspensions, a class of field-responsive liquid matter systems possessing the ability to undergo significant changes in their strength upon…
J. M. Rubí, J. M. G. VilarSep 24, 1999
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Phase separation, percolation and giant isotope effect in manganites
Phase separation and a tendency to form inhomogeneous structures seems to be a generic property of systems with strongly correlated electrons. After shortly summarising the existing theoretical…
D. KhomskiiSep 23, 1999
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Charge inversion in DNA-amphiphile complexes: Possible application to gene therapy
We study a complex formation between the DNA and cationic amphiphilic molecules. As the amphiphile is added to the solution containing DNA, a cooperative binding of surfactants to the DNA molecules…
P. S. Kuhn, Y. Levin, M. C. BarbosaSep 23, 1999
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Magnetization-controlled spin transport in DyAs/GaAs layers
Electrical transport properties of DyAs epitaxial layers grown on GaAs have been investigated at various temperatures and magnetic fields up to 12T. The measured longitudinal resistances show two…
J. M. Mao, M. E. Zudov, R. R. Du et al.Sep 23, 1999
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Acoustic Energy and Momentum in a Moving Medium
By exploiting the mathematical analogy between the propagation of sound in a non-homogeneous potential flow and the propagation of a scalar field in a background gravitational field, various wave…
Michael StoneSep 21, 1999
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Iordanskii Force and the Gravitational Aharonov-Bohm effect for a Moving Vortex
I discuss the scattering of phonons by a vortex moving with respect to a superfluid condensate. This allows us to test the compatibility of the scattering-theory derivation of the Iordanskii force…
Michael StoneSep 21, 1999
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Electron locking in semiconductor superlattices
We describe a novel state of electrons and phonons arising in semiconductor superlattices (SSL) due to strong electron-phonon interactions. These states are characterized by a localization of phonons…
F. V. Kusmartsev, H. S. DhillonSep 21, 1999
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The energy spectrum of complex periodic potentials of the Kronig-Penney type
We consider a complex periodic PT-symmetric potential of the Kronig-Penney type, in order to elucidate the peculiar properties found by Bender et al. for potentials of the form V=i( x)2N+1,…
H. F. JonesSep 20, 1999
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Electron States in a Staircase Infinitely Deep Well in a Magnetic Field
The electron states in a size-quantaized coated semiconductor wire in a uniform magnetic field applied parallel to the wire axis is considered. The wave functions are found and the equation for…
M. M. Aghasyan A. A. KirakosyanSep 20, 1999
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Band structure of local pairs. Mathematical tools
A system of strongly interacting fermions in a solid state is discussed. A structure of singlet and triplet coupled 2-particle states and their excitation spectra are investigated. It is shown that…
S. G. RubinSep 18, 1999
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Calculation of Neel temperature for S=1/2 quasi-one-dimensional Heisenberg antiferromagnets
Isotropic S=1/2 quasi-one-dimensional antiferromagnets are considered within the bosonization method. The 1/zp-corrections to the interchain mean-field theory (zp is the number of nearest neighbors…
V. Yu. Irkhin, A. A. KataninSep 17, 1999
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Slow 4He Quenches Produce Fuzzy, Transient Vortices
We examine the Zurek scenario for the production of vortices in quenches of liquid 4He in the light of recent experiments. Extending our previous results to later times, we argue that short…
R. J. RiversSep 16, 1999
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High-field transport properties of bulk Si: A test for the Fokker-Planck approach
High electric-field transport parameters are calculated using an analytical Fokker-Planck approach (FPA), where transport is modeled as a drift-diffusion process in energy space. We have applied the…
F. Comas, Nelson StudartSep 16, 1999
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The spin-1/2 transverse XX chain with regularly alternating bonds and fields
We use continued fractions for a study of the thermodynamic properties of the periodic nonuniform spin-1/2 isotropic XY chain in a non-random/random (Lorentzian) transverse field. The obtained…
Oleg Derzhko, Johannes Richter, Oles' ZaburannyiSep 16, 1999
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Worse fluctuation method for fast Value-at-Risk estimates
We show how one can actually take advantage of the strongly non-Gaussian nature of the fluctuations of financial assets to simplify the calculation of the Value-at-Risk of complex non linear…
Jean-Philippe Bouchaud, Marc PottersSep 16, 1999
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Microwave study of quantum n-disk scattering
We describe a wave-mechanical implementation of classically chaotic n-disk scattering based on thin 2-D microwave cavities. Two, three, and four-disk scattering are investigated in detail. The…
Wentao Lu, Lorenza Viola, Kristi Pance et al.Sep 16, 1999
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Introduction to Multicanonical Monte Carlo Simulations
Monte Carlo simulation with a-priori unknown weights have attracted recent attention and progress has been made in understanding (i) the technical feasibility of such simulations and (ii)…
Bernd A. BergSep 15, 1999
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Internal Diffusion-Limited Aggregation: Parallel Algorithms and Complexity
The computational complexity of internal diffusion-limited aggregation (DLA) is examined from both a theoretical and a practical point of view. We show that for two or more dimensions, the problem of…
Cristopher Moore, Jonathan MachtaSep 15, 1999
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Lexicon of Topological Defects in He-3 Superfluids
Defects in the multi-dimensional macroscopic quantum field of the He-3 superfluids are localized objects with a topological charge and are topologically stable. They include point-like objects,…
V. B. Eltsov, M. KrusiusSep 15, 1999
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Charge Fluctuations in the Two-Dimensional One-Component Plasma
We study, via computer simulations, the fluctuations in the net electric charge, in a two dimensional one component plasma (OCP) with uniform background charge density -e ρ, in a region Λ inside…
D. Levesque, J. -J. Weis, J. L. LebowitzSep 14, 1999
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Finite-Size Scaling in Two-dimensional Continuum Percolation Models
We test the universal finite-size scaling of the cluster mass order parameter in two-dimensional (2D) isotropic and directed continuum percolation models below the percolation threshold by computer…
Van Lien Nguyen, Enrique CanessaSep 14, 1999
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The partition function for "composite particles"
We calculate the partition function for "composite particles". For any finite number of states d, and in the following two cases: 1)all states have the same energy, 2)the energy is linearly…
M. BergèreSep 13, 1999
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On non-Riemannian geometry of twisted nematic liquid crystals
A teleparallel geometrical description of the nematic phases of liquid crystals is proposed.In the case of the twisted geometry of nematics Cartan torsion is given by a spatial helical form which…
L. C. Garcia de AndradeSep 13, 1999
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Path integral Monte Carlo simulation of helium at negative pressures
Path integral Monte Carlo (PIMC) simulations of liquid helium at negative pressure have been carried out for a temperature range from the critical temperature to below the superfluid transition. We…
G. H. Bauer, D. M. Ceperley, Nigel GoldenfeldSep 11, 1999
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Tunnelling of topological line defects in strongly coupled superfluids
The geometric theory of vortex tunnelling in superfluid liquids is developed. Geometry rules the tunnelling process in the approximation of an incompressible superfluid, which yields the identity of…
Uwe R. FischerSep 10, 1999
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