Exact results for the optical absorption of strongly correlated electrons in a half-filled Peierls-distorted chainIn this second of three articles on the optical absorption of electrons in a half-filled Peierls-distorted chain we present exact results for strongly correlated tight-binding electrons. In the limit…F. Gebhard, K. Bott, M. Scheidler et al.·Sep 10, 1996SaveLearn
Optical absorption of non-interacting tight-binding electrons in a Peierls-distorted chain at half band-fillingIn this first of three articles on the optical absorption of electrons in half-filled Peierls-distorted chains we present analytical results for non-interacting tight-binding electrons. We carefully…F. Gebhard, K. Bott, M. Scheidler et al.·Sep 10, 1996SaveLearn
A renormalization group study of a class of reaction-diffusion model, with particles inputWe study a class of reaction-diffusion model extrapolating continuously between the pure coagulation-diffusion case (A+A A) and the pure annihilation-diffusion one (A+A) with…Pierre-Antoine Rey, Michel Droz·Sep 10, 1996SaveLearn
Kinetic Ising System in an Oscillating External Field: Stochastic Resonance and Residence-Time DistributionsExperimental, analytical, and numerical results suggest that the mechanism by which a uniaxial single-domain ferromagnet switches after sudden field reversal depends on the field magnitude and the…S. W. Sides, R. A. Ramos, P. A. Rikvold et al.·Sep 9, 1996SaveLearn
Impurity-induced diffusion bias in epitaxial growthWe introduce two models for the action of impurities in epitaxial growth. In the first, the interaction between the diffusing adatoms and the impurities is ``barrier''-like and, in the…Luis A. Nunes Amaral, Joachim Krug·Sep 9, 1996SaveLearn
Statistics of Largest Loops in a Random WalkWe report further findings on the size distribution of the largest neutral segments in a sequence of N randomly charged monomers [D. Ertas and Y. Kantor, Phys. Rev. E53, 846 (1996);…Deniz Ertas, Yacov Kantor·Sep 9, 1996SaveLearn
Electronic Structure of Lanthanum Hydrides with Switchable Optical PropertiesRecent dramatic changes in the optical properties of LaH2+x and YH2+x films discovered by Huiberts et al. suggest their electronic structure is described best by a local model. Electron…K. K. Ng, F. C. Zhang, V. I. Anisimov et al.·Sep 9, 1996SaveLearn
Coulomb Correlations and Pseudo-gap Effects in a Pre-formed Pair Model for the CupratesWe extend previous work on pre-formed pair models of superconductivity to incorporate Coulomb correlation effects. For neutral systems, these models have provided a useful scheme which interpolates…Jiri Maly, K. Levin, D. Z. Liu·Sep 9, 1996SaveLearn
Magnetic states induced by electron-electron interactions in a plane quasiperiodic tilingWe consider the Hubbard model for electrons in a two-dimensional quasiperiodic tiling using the Hartree--Fock approximation. Numerical solutions are obtained for the first three square approximants…A. Jagannathan, H. J. Schulz·Sep 9, 1996SaveLearn
Eigenfunctions of electrons in weakly disordered quantum dots: Crossover between orthogonal and unitary symmetriesA one-parameter random matrix model is proposed for describing the statistics of the local amplitudes and phases of electron eigenfunctions in a mesoscopic quantum dot in an arbitrary magnetic field.…E. Kanzieper, V. Freilikher·Sep 9, 1996SaveLearn
Signatures of Chaos in the Statistical Distribution of Conductance Peaks in Quantum DotsAnalytical expressions for the width and conductance peak distributions of irregularly shaped quantum dots in the Coulomb blockade regime are presented in the limits of conserved and broken…Y. Alhassid, C. H. Lewenkopf·Sep 8, 1996SaveLearn
Quasiholes and fermionic zero modes of paired fractional quantum Hall states: the mechanism for nonabelian statisticsThe quasihole states of several paired states, the Pfaffian, Haldane-Rezayi, and 331 states, which under certain conditions may describe electrons at filling factor ν=1/2 or 5/2, are studied,…N. Read, E. Rezayi·Sep 8, 1996SaveLearn
Stochastic Resonance in a DipoleWe show that the dipole, a system usually proposed to model relaxation phenomena, exhibits a maximum in the signal-to-noise ratio at a non-zero noise level, thus indicating the appearance of…J. M. G. Vilar, A. Pérez-Madrid, J. M. Rubí·Sep 8, 1996SaveLearn
Divergent Signal-to-Noise Ratio and Stochastic Resonance in Monostable SystemsWe present a class of systems for which the signal-to-noise ratio always increases when increasing the noise and diverges at infinite noise level. This new phenomenon is a direct consequence of the…J. M. G. Vilar, J. M. Rubí·Sep 8, 1996SaveLearn
Oscillatory Behavior of the Rate of Escape through an Unstable Limit CycleSuppose a two-dimensional dynamical system has a stable attractor that is surrounded by an unstable limit cycle. If the system is additively perturbed by white noise, the rate of escape through the…Robert S. Maier, Daniel L. Stein·Sep 8, 1996SaveLearn
Convergent multiplicative processes repelled from zero: power laws and truncated power lawsRandom multiplicative processes wt =λ1 λ2 ... λt (with < λj > 0 ) lead, in the presence of a boundary constraint, to a distribution P(wt) in the form of a power law wt-(1+μ). We…Rama Cont, Didier Sornette·Sep 7, 1996SaveLearn
Determination of Exchange Parameters for CaV4O9Magnetic susceptibility measured for CaV4O9 is analyzed by a method with high temperature expansion. The analysis is consistent with the g-value which is close to 2 and is observed by an ESR…Ken'ichi Takano, K. Sano·Sep 7, 1996SaveLearn
Properties of Ridges in Elastic MembranesWhen a thin elastic sheet is confined to a region much smaller than its size the morphology of the resulting crumpled membrane is a network of straight ridges or folds that meet at sharp vertices. A…Alexander E. Lobkovsky, T. A. Witten·Sep 6, 1996SaveLearn
Disorder-Induced Critical Phenomena in Hysteresis: A Numerical Scaling AnalysisExperimental systems with a first order phase transition will often exhibit hysteresis when out of equilibrium. If defects are present, the hysteresis loop can have different shapes: with small…Olga Perkovic, Karin A. Dahmen, James P. Sethna·Sep 6, 1996SaveLearn
Comment on "Theory of electron energy loss in a random system of spheres"In a recent paper, Barrera and Fuchs [Phys. Rev. B 52, 3256 (1995)] provide a theory of electron energy loss in a random system of spheres. In this comment, we point out that the approach of Barrera…Liang Fu, Lorenzo Resca·Sep 6, 1996SaveLearn
Boundary Layer Analysis of the Ridge Singularity in a Thin PlateLarge deformations of thin elastic plates and shells present a formidable problem in continuum mechanics which is generally intractable except by numerical methods. Conventional approaches break down…Alexander E. Lobkovsky·Sep 6, 1996SaveLearn
Tunneling Between Parallel Two-Dimensional Electron GasesThe tunneling between two parallel two-dimensional electron gases has been investigated as a function of temperature T, carrier density n, and the applied perpendicular magnetic field B. In…N. Turner, J. T. Nicholls, E. H. Linfield et al.·Sep 6, 1996SaveLearn
The energy flux into a fluidized granular medium at a vibrating wallWe study the power input of a vibrating wall into a fluidized granular medium, using event driven simulations of a model granular system. The system consists of inelastic hard disks contained between…Sean McNamara, Jean-Louis Barrat·Sep 6, 1996SaveLearn
Variational and DMRG studies of the Frustrated Antiferromagnetic Heisenberg S=1 Quantum Spin ChainWe study a frustrated antiferromagnetic isotropic Heisenberg S=1 chain using a variational ansatz and the DMRG. At αD=0.284(1), there is a disorder point of the second kind, marking the onset of…A. Kolezhuk, R. Roth, U. Schollwoeck·Sep 6, 1996SaveLearn
Current conservation in two-dimensional AC-transportThe electric current conservation in a two-dimensional quantum wire under a time dependent field is investigated. Such a conservation is obtained as the global density of states contribution to the…J. Wang, Q. R. Zheng, H. Guo·Sep 6, 1996SaveLearn