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Condensed Matter papers — page 160

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Thermodynamics of the t-J Ladder: A Stable Finite Temperature Density Matrix Renormalization Group Calculation
Accurate numerical simulations of a doped t-J model on a two-leg ladder are presented for the particle number, chemical potential, magnetic susceptibility and entropy in the limit of large exchange…
Beat Ammon, Matthias Troyer, T. M. Rice et al.Dec 9, 1998
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Parallel updating cellular automaton models of driven diffusive Frenkel-Kontorova-type systems
Three cellular automaton (CA) models of increasing complexity are introduced to model driven diffusive systems related to the generalized Frenkel-Kontorova (FK) models recently proposed by Braun…
Bing-Hong Wang, Y. R. Kwong, P. M. Hui et al.Dec 9, 1998
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Excess conductance in normal-metal/superconductor junctions
The current-voltage characteristics of Au/InOx/Pb tunnel junctions exhibit peculiar zero-bias anomalies. At low temperature the zero-bias resistance attains values that are smaller than the normal…
A. Vaknin, A. Frydman, Z. OvadyahuDec 9, 1998
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Highly Optimized Tolerance: Robustness and Power Laws in Complex Systems
We introduce highly optimized tolerance (HOT), a mechanism that connects evolving structure and power laws in interconnected systems. HOT systems arise, e.g., in biology and engineering, where design…
J. M. Carlson, John DoyleDec 8, 1998
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Phase Transitions without Thermodynamic Limit
Microcanonical statistics can be well applied to non-extensive systems like nuclei, atomic clusters and systems at phase transitions of first order with inhomogeneous configurations like phase…
D. H. E. GrossDec 8, 1998
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Multifractality of Brownian motion near absorbing polymers
We characterize the multifractal behavior of Brownian motion in the vicinity of an absorbing star polymer. We map the problem to an O(M)-symmetric phi4-field theory relating higher moments of the…
Christian von Ferber, Yurij HolovatchDec 8, 1998
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Lectures on Non Perturbative Field Theory and Quantum Impurity Problems
These are lectures presented at the Les Houches Summer School ``Topology and Geometry in Physics'', July 1998. They provide a simple introduction to non perturbative methods of field theory…
H. SaleurDec 7, 1998
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Cavitation induced by explosion in a model of ideal fluid
We discuss the problem of an explosion in the cubic-quintic superfluid model, in relation to some experimental observations. We show numerically that an explosion in such a model might induce a…
Christophe JosserandDec 7, 1998
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Perturbative and non-perturbative parts of eigenstates and local spectral density of states: the Wigner band random matrix model
A generalization of Brillouin-Wigner perturbation theory is applied numerically to the Wigner Band Random Matrix model. The perturbation theory tells that a perturbed energy eigenstate can be divided…
Wen-ge WangDec 7, 1998
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Phonon Mediated Transresistivity in a Double Layer Composite Fermion System
We consider the fractional drag in a double layer system of two-dimensional electrons in the half-filled lowest Landau level. At sufficiently large inter-layer separations the drag is dominated by…
D. V. KhveshchenkoDec 7, 1998
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Cross-over from renormalized classical to quantum critical behaviour of a two dimensional magnet
This paper has been withdrawn by the author due to an error in the data-analysis.
H. M. RonnowDec 7, 1998
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The dynamo effect - A dynamic renormalisation group approach
The Dynamo effect is used to describe the generation of magnetic fields in astrophysical objects. However, no rigorous derivation of the dynamo equation is available. We justify the form of the…
Abhik Basu, Jayanta K BhattacharjeeDec 6, 1998
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Quantum point contact in a compressible Quantum Hall liquid
We consider electron transport through a quantum point contact between compressible Quantum Hall liquids and derive the contact's impedance function for both diffusive and ballistic regimes of…
D. V. KhveshchenkoDec 6, 1998
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The mechanism of thickness selection in the Sadler-Gilmer model of polymer crystallization
Recent work on the mechanism of polymer crystallization has led to a proposal for the mechanism of thickness selection which differs from those proposed by the surface nucleation theory of Lauritzen…
Jonathan Doye, Daan FrenkelDec 5, 1998
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Electronic Structure, Correlation Effects and Physical Properties of d- and f-Metals and Their Compounds
The book includes all main physical properties of d- and f-transition-metal systems and corresponding theoretical concepts. Especial attention is paid to the theory of magnetism and transport…
V. Yu. Irkhin, Yu. P. IrkhinDec 4, 1998
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KPZ Equation and Surface Growth Model
We consider the ultra-discrete Burgers equation. All variables of the equation are discrete. We classify the equation into five regions in the parameter space. We discuss behavior of solutions. Using…
Masato HisakadoDec 4, 1998
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Incipient failure in sandpile models
Elastoplastic and constitutive equation theories are two approaches based on very different assumptions for creating a continuum theory for the stress distributions in a static sandpile. Both models…
O. Narayan, S. R. NagelDec 4, 1998
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The 2-d Coulomb Gas on a 1-d lattice
The statistical mechanics of a two dimensional Coulomb gas confined to one dimension is studied, wherein hard core particles move on a ring. Exact self-duality is shown for a version of the…
O. Narayan, B. S. ShastryDec 4, 1998
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A Conjecture for possible theory for the description of high temperature superconductivity and antiferromagnetism
Keeping in mind some salient features of quantum symmetry groups and in lieu of the interesting critique by Baskaran and Anderson of the hypothesis of the SO(5) model of Zhang and the related works…
Sher AlamDec 3, 1998
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Nonclassical effects and off-diagonal couplings in a model for FeBr2
Using Monte Carlo techniques, we show that the recently experimentally observed transitionlike phenomena in the transverse spin-ordering close to the anomalies in the antiferromagnetic phase of FeBr2…
M. Pleimling, W. SelkeDec 3, 1998
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The level shifting induced negative magnetoresistance in the nearest-neighbor hopping conduction
We propose a new mechanism of negative magnetoresistance in non-magnetic granular materials in which electron transport is dominated by hopping between two nearest-neighbor clusters. We study the…
X. R. Wang, S. C. Ma, X. C. XieDec 3, 1998
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Perturbation of infra-red fixed points and duality in quantum impurity problems
We explain in this paper how a meaningful irrelevant perturbation theory around the infra-red (strong coupling) fixed point can be carried out for integrable quantum impurity problems. This is…
F. Lesage, H. SaleurDec 2, 1998
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On the ground state of solids with strong electron correlations
We formulate the calculation of the ground-state wavefunction and energy of a system of strongly correlated electrons in terms of scattering matrices. A hierarchy of approximations is introduced…
P. Fulde, H. Stoll, K. KladkoDec 2, 1998
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Quantum kinetics and thermalization in a particle bath model
We study the dynamics of relaxation and thermalization in an exactly solvable model of a particle interacting with a harmonic oscillator bath. Our goal is to understand the effects of non-Markovian…
S. M. Alamoudi, D. Boyanovsky, H. J. de VegaDec 2, 1998
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How to compute the thermodynamics of a glass using a cloned liquid
The recently proposed strategy for studying the equilibrium thermodynamics of the glass phase using a molecular liquid is reviewed and tested in details on the solvable case of the p-spin model. We…
Marc MezardDec 2, 1998
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