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Condensed Matter papers — page 214

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New Monte Carlo algorithms for classical spin systems
We describe a number of recently developed cluster-flipping algorithms for the efficient simulation of classical spin models near their critical temperature. These include the algorithms of Wolff,…
G. T. Barkema, M. E. J. NewmanMar 19, 1997
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New Class of Random Matrix Ensembles with Multifractal Eigenvectors
Three recently suggested random matrix ensembles (RME) are linked together by an exact mapping and plausible conjections. Since it is known that in one of these ensembles the eigenvector statistics…
V. E. Kravtsov, K. A. MuttalibMar 18, 1997
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Valence Bond Mapping of Antiferromagnetic Spin Chains
Boson mapping techniques are developed to describe valence bond correlations in quantum spin chains. Applying the method to the alternating bond hamiltonian for a generic spin chain, we derive an…
Jorge Dukelsky, Stuart PittelMar 18, 1997
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Phase Transitions of the Flux Line Lattice in High-Temperature Superconductors with Weak Columnar and Point Disorder
We study the effects of weak point and columnar disorder on the vortex-lattice phase transitions in high temperature superconductors. The combined effect of thermal fluctuations and of quenched…
Yadin Y. GoldschmidtMar 17, 1997
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A local approach for global partial density of states
To apply the scattering approach for the problem of AC transport through coherent quantum conductors, various partial density of states must be evaluated. If the global partial density of states…
Jian Wang, Qingrong Zheng, Hong GuoMar 15, 1997
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Almost-Hermitian Random Matrices: Crossover from Wigner-Dyson to Ginibre eigenvalue statistics
By using the method of orthogonal polynomials we analyze the statistical properties of complex eigenvalues of random matrices describing a crossover from Hermitian matrices characterized by the…
Yan V. Fyodorov, Boris A. Khoruzhenko, H. -J. SommersMar 14, 1997
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Implicit Finite-Size Effects in Computer Simulations
The influence of periodic boundary conditions (implicit finite-size effects) on the anisotropy of pair correlations in computer simulations is studied for a dense classical fluid of pair-wise…
A. R. Denton, P. A. EgelstaffMar 14, 1997
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Theory of colossal magnetoresistance
The history and recent developments in studying (colossal) magnetoresistance in perovskite manganese oxides is reviewed. We emphasize the growing evidence for strongly coupled spin, charge and…
Alan R. Bishop, Heinrich RöderMar 14, 1997
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Phases in Strongly Coupled Electronic Bilayer Liquids
The strongly correlated liquid state of a bilayer of charged particles has been studied via the HNC calculation of the two-body functions. We report the first time emergence of a series of structural…
V. I. Valtchinov, G. Kalman, K. BlagoevMar 14, 1997
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Magnetism of CaV2O5, CaV3O7, CaV4O9: quantum effects or orbital ordering?
The quasi 2-d spin 1/2 materials CaVnO2n+1 (n=2,3,4) are often treated as systems in which quantum effects play a dominant role: CaV2O5 has a spin gap and is thought to be a spin ladder; CaV3O7…
S. Marini, D. KhomskiiMar 13, 1997
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Orthogonal Polynomials and Exact Correlation Functions for Two Cut Random Matrix Models
Exact eigenvalue correlation functions are computed for large N hermitian one-matrix models with eigenvalues distributed in two symmetric cuts. An asymptotic form for orthogonal polynomials for…
Nivedita DeoMar 13, 1997
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Quantum confinement effects on the ordering of the lowest-lying excited states in conjugated chains
The symmetrized density matrix renormalization group approach is applied within the extended Hubbard-Peierls model (with parameters U/t, V/t, and bond alternation δ) to study the ordering of the…
Z. Shuai, J. L. Bredas, S. K. Pati et al.Mar 13, 1997
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Limited Range Fractality of Randomly Adsorbed Rods
Multiple resolution analysis of two dimensional structures composed of randomly adsorbed penetrable rods, for densities below the percolation threshold, has been carried out using box-counting…
Daniel A. Lidar, Ofer Biham, David AvnirMar 13, 1997
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Microscopic Model for Sequential Tunneling in Semiconductor Multiple Quantum Wells
We propose a selfconsistent microscopic model of vertical sequential tunneling through a multi-quantum well.The model includes a detailed description of the contacts,uses the Transfer Hamiltonian for…
Ramon Aguado, Gloria Platero, Miguel Moscoso et al.Mar 13, 1997
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Only Fermi-Liquids are Metals
Any singular deviation from Landau Fermi-liquid theory appears to lead, for arbitrarily small concentration of impurities coupling to a non-conserved quantity, to a vanishing density of states at the…
C. M. VarmaMar 12, 1997
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Dynamical mean-field theory of the small polaron
A dynamical mean-field theory of the small polaron problem is presented, which becomes exact in the limit of infinite dimensions. The ground state properties and the one-electron spectral function…
S. Ciuchi, F. de Pasquale, S. Fratini et al.Mar 12, 1997
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Projected dynamics for metastable decay in Ising models
The magnetization switching dynamics in the kinetic Ising model is projected onto a one-dimensional absorbing Markov chain. The resulting projected dynamics reproduces the direct simulation results…
M. Kolesik, M. A. Novotny, P. A. Rikvold et al.Mar 12, 1997
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Enhanced magnetic fluctuations in doped spin-Peierls systems: a single-chain model analysis
We analyze by means of real space Renormalization Group (RG) as well as by exact diagonalizations the properties of a single-chain model of a doped spin-Peierls system, where a major role is played…
M. Fabrizio, R. MélinMar 11, 1997
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Hot electron relaxation: Exact solution for a many electron model
The exact nonequilibrium time evolution of the momentum distribution for a finite many particle system in one dimension with a linear energy dispersion coupled to optical phonons is presented. For…
K. Schoenhammer, C. WoehlerMar 11, 1997
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Solitons and (spin-)Peierls transition in disordered quasi-one-dimensional systems
We study the (spin-)Peierls transition in quasi-one-dimensional disordered systems, treating the lattice classically. The role of kinks, induced thermally and by disorder, is emphasized. For weak…
M. Mostovoy, D. KhomskiiMar 11, 1997
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Disorder-induced solitons in conjugated polymers
We show that weak off-diagonal disorder in degenerate ground state conjugated polymers results in a finite density of randomly positioned kinks (solitons and antisolitons) in the lattice…
Maxim Mostovoy, Marc Thilo Figge, Jasper KnoesterMar 11, 1997
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Dynamics of two interacting particles in classical billiards
The problem of two interacting particles moving in a d-dimensional billiard is considered here. A suitable coordinate transformation leads to the problem of a particle in an unconventional…
Lilia Meza-Montes, Sergio E. UlloaMar 10, 1997
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Charge injection instability in perfect insulators
We show that in a macroscopic perfect insulator, charge injection at a field-enhancing defect is associated with an instability of the insulating state or with bistability of the insulating and the…
Thomas ChristenMar 10, 1997
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The Crossover beteween Aslamazov-Larkin and Short Wavelength Fluctuations Regimes in HTS Conductivity Experiments
We present paraconductivity (AL) measurements in three different high temperature superconductors: a melt textured YBa2Cu3O7 sample, a Bi2Sr2CaCu2O8 epitaxial thin film and a highly…
M. R. Cimberle, C. Ferdeghini, E. Giannini et al.Mar 10, 1997
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Suggested Model for the Origin of Mosaic Structure of DNA
In view of the critical behavior exhibited by a statistical model describing a one dimensional crystal containing isotopic impurities and the fact that for impurity mass parameter 3 times the host…
Carla Goldman, Robson Francisco de SouzaMar 10, 1997
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