Ferromagnetism in Electronic Models for ManganitesGround state properties of the Kondo model for manganese oxides in one dimension are studied using numerical techniques. The large Hund coupling (JH) limit is specially analyzed. A robust region…Jose Riera, Karen Hallberg, Elbio Dagotto·Sep 12, 1996SaveLearn
Some comments on the nature of universal properties in low-temperature glassesWe discuss the recent theory of Burin and Kagan that attempts to explain the existence of universal low temperature properties in amorphous solids. We suggest a realistic experimental scenario that…David R. Reichman, Peter Neu, Robert J. Silbey·Sep 12, 1996SaveLearn
Heat Conduction in the Heavy Fermion Superconductor UPd2Al3We present preliminary measurements of the thermal conductivity of the heavy fermion superconductor UPd2Al3 for the normal and superconducting states at low temperatures. As T0, the…May Chiao, Benoit Lussier, Brett Ellman et al.·Sep 12, 1996SaveLearn
Conductance Peak Distributions in Quantum Dots and the Crossover between Orthogonal and Unitary SymmetriesClosed expressions are derived for the resonance widths and Coulomb blockade conductance peak heights in quantum dots for the crossover regime between conserved and broken time-reversal symmetry. The…Y. Alhassid, J. N. Hormuzdiar, N. D. Whelan·Sep 12, 1996SaveLearn
Mott transition in one dimensionI review some of the results on the Mott transition in one dimensional systems. In particular I discuss the phase diagram and critical properties of both Mott transitions at fixed filling and upon…T. Giamarchi·Sep 12, 1996SaveLearn
Numerical study of a non-equilibrium interface modelWe have carried out extensive computer simulations of one-dimensional models related to the low noise (solid-on-solid) non-equilibrium interface of a two dimensional anchored Toom model with unbiased…B. Subramanian, G. T. Barkema, J. L. Lebowitz et al.·Sep 12, 1996SaveLearn
Phase diagrams of flux lattices with disorderWe review the prediction, made in a previous work [Phys. Rev. B 52 (1995)], that the phase diagram of type II superconductors consists of a topologically ordered Bragg glass phase at low fields…T. Giamarchi, P. Le Doussal·Sep 12, 1996SaveLearn
Quantum Fluctuations Driven Orientational Disordering: A Finite-Size Scaling StudyThe orientational ordering transition is investigated in the quantum generalization of the anisotropic-planar-rotor model in the low temperature regime. The phase diagram of the model is first…R. Martonak, D. Marx, P. Nielaba·Sep 12, 1996SaveLearn
The Dynamics of a Genetic Algorithm for a Simple Learning ProblemA formalism for describing the dynamics of Genetic Algorithms (GAs) using methods from statistical mechanics is applied to the problem of generalization in a perceptron with binary weights. The…Magnus Rattray, Jonathan Shapiro·Sep 12, 1996SaveLearn
Thermodynamics of Coupled Identical Oscillators within the Path Integral FormalismA generalization of symmetrized density matrices in combination with the technique of generating functions allows to calculate the partition function of identical particles in a parabolic confining…F. Brosens, J. T. Devreese, L. F. Lemmens·Sep 12, 1996SaveLearn
Some exact results for the multicomponent t-J modelWe present a generalization of the Sutherland's multicomponent model. Our extension includes both the ferromagnetic and the antiferromagnetic t-J model for any value of the exchange coupling J…Antimo Angelucci, Sandro Sorella·Sep 12, 1996SaveLearn
Non-universal corrections to the level curvature distribution beyond random matrix theoryThe level curvature distribution function is studied beyond the random matrix theory for the case of T-breaking perturbations over the orthogonal ensemble. The leading correction to the shape of the…I. V. Yurkevich, V. E. Kravtsov·Sep 12, 1996SaveLearn
Fluctuating "order parameter" for a quantum chaotic system with partially broken time-reversal symmetryThe functional defined as the squared modulus of the spatial average of the wave function squared, plays the role of an ``order parameter'' for the transition between Hamiltonian ensembles…S. A. van Langen, P. W. Brouwer, C. W. J. Beenakker·Sep 11, 1996SaveLearn
Exchange Coupling Between Iron Layers Separated by BCC CopperThe exchange coupling between Fe layers separated by BCC Cu is calculated for Fe/Cu/Fe (001) trilayers. It is shown that the coupling is basically regulated by three extrema of the bulk BCC Cu Fermi…A. T. Costa, J. d'Albuquerque e Castro, R. B. Muniz et al.·Sep 11, 1996SaveLearn
Tunneling in a cavityThe mechanism of coherent destruction of tunneling found by Grossmann et al. [Phys. Rev. Lett. 67, 516 (1991)] is studied from the viewpoint of quantum optics by considering the photon statistics of…Peter Neu, Robert J. Silbey·Sep 11, 1996SaveLearn
Pairing Constraint on the Real Space Formalism of the Theory of SuperconductivityWe review the new theory of impure superconductors constructed by Kim and Overhauser, and further developed by Kim. It was shown that Gor'kov's self-consistency equation needs a pairing…Yong-Jihn Kim·Sep 11, 1996SaveLearn
Charge and spin dynamics in the one-dimensional t-Jz and t-J modelsThe impact of the spin-flip terms on the (static and dynamic) charge and spin correlations in the Luttinger-liquid ground state of the 1D t-J model is assessed by comparison with the same…Shu Zhang, Michael Karbach, Gerhard Müller et al.·Sep 11, 1996SaveLearn
Cumulant approach to weakly doped antiferromagnetsWe present a new approach to static and dynamical properties of holes and spins in weakly doped antiferromagnets in two dimensions. The calculations are based on a recently introduced cumulant…Matthias Vojta, Klaus W. Becker·Sep 11, 1996SaveLearn
Design of Force Fields from Data at Finite TemperatureWe investigate the problem of how to obtain the force field between atoms of an experimentally determined structure. We show how this problem can be efficiently solved, even at finite temperature,…J. M. Deutsch, Tanya Kurosky·Sep 11, 1996SaveLearn
Populated Domain WallsSeveral experiments suggest that the charge carriers in the normal state of certain cuprate superconductors reside on domain walls. In an earlier paper, we suggested that several aspects of the…Chetan Nayak, Frank Wilczek·Sep 10, 1996SaveLearn
The Granular Phase DiagramThe kinetic energy distribution function satisfying the Boltzmann equation is studied analytically and numerically for a system of inelastic hard spheres in the case of binary collisions.…Sergei E. Esipov, Thorsten Poeschel·Sep 10, 1996SaveLearn
Disappearance of integer quantum Hall effectThe disappearance of integer quantum Hall effect (IQHE) at strong disorder and weak magnetic field is studied in a lattice model. A generic sequence by which the IQHE plateaus disappear is revealed:…D. N. Sheng, Z. Y. Weng·Sep 10, 1996SaveLearn
Coulomb Effects on the Magnetoconductance of a Two-Dimensional Electron Gas in a Lateral Superlattice: A Screened Hartree-Fock CalculationWe calculate the magnetoconductivity tensor of a 2D electron gas in a 1D periodic potential and quantising magnetic fields. We study the internal structure of the Shubnikov-de Haas peaks and analyse…Andrei Manolescu, Rolf R. Gerhardts·Sep 10, 1996SaveLearn
Theory of Electronic FerroelectricityWe present a theory of the linear and nonlinear optical characteristics of the insulating phase of the Falicov-Kimball model within the self-consistent mean-field approximation. The Coulomb…T. Portengen, Th. Ostreich, L. J. Sham·Sep 10, 1996SaveLearn
Optical absorption of strongly correlated half-filled Mott-Hubbard chainsIn this last of three articles on the optical absorption of electrons in a half-filled Peierls-distorted chain we address the dimerized extended Hubbard model in the limit of a large on-site…F. Gebhard, K. Bott, M. Scheidler et al.·Sep 10, 1996SaveLearn