Confinement of Spin and Charge in High-Temperature SuperconductorsBy exploiting the internal gauge-invariance intrinsic to a spin-charge separated electron, we show that such degrees of freedom must be confined in two-dimensional superconductors experiencing strong…J. P. Rodriguez, Pascal Lederer·Apr 17, 1996SaveLearn
Hidden Order and Dimerization Transition in S=2 ChainsWe study ground state properties of the S=2 quantum antiferromagnetic chain with a bond alternation \[ H = Σj [ 1 + δ(-1)j ] Sj · Sj+1 \] by a…Masanori Yamanaka, Masaki Oshikawa, Seiji Miyashita·Apr 17, 1996SaveLearn
Entangled Polymer Rings in 2D and ConfinementThe statistical mechanics of polymer loops entangled in the two-dimensional array of randomly distributed obstacles of infinite length is discussed. The area of the loop projected to the plane…Matthias Otto, Thomas A. Vilgis·Apr 16, 1996SaveLearn
Two-Scale AnnihilationThe kinetics of single-species annihilation, A+A 0, is investigated in which each particle has a fixed velocity which may be either v with equal probability, and a finite diffusivity. In…E. Ben-Naim, S. Redner, P. L. Krapivsky·Apr 16, 1996SaveLearn
Non-equilibrium thermodynamics of thermionic emission processes in abrupt semiconductor junctions, including the effects of surface statesThe methods of non-equilibrium thermodynamics of systems with an interface have been applied to the study of thermionic emission processes in abrupt semiconductor junctions, including the effects of…G. Gomila, A. Perez-Madrid, J. M. Rubi·Apr 16, 1996SaveLearn
a-b Plane Anisotropy in YBCOThe zero temperature in plane penetration depth in an untwinned single crystal of optimally doped YBa2Cu3O6.93 is highly anisotropic. This fact has been interpreted as evidence that a large amount…W. Atkinson, J. P. Carbotte, C. O'Donovan·Apr 16, 1996SaveLearn
Composite Fermions with Orbital MagnetizationFor quantum Hall systems, in the limit of large magnetic field (or equivalently small electron band mass mb), the static response of electrons to a spatially varying magnetic field is largely…Steven H. Simon, Ady Stern, Bertrand I. Halperin·Apr 16, 1996SaveLearn
Analytical and Numerical Study of Internal Representations in Multilayer Neural Networks with Binary WeightsWe study the weight space structure of the parity machine with binary weights by deriving the distribution of volumes associated to the internal representations of the learning examples. The learning…Simona Cocco, Remi Monasson, Riccardo Zecchina·Apr 16, 1996SaveLearn
Critical behaviour at the metal-insulator transition in 3-dimensional disordered systems in a strong magnetic fieldThe critical behaviour of 3-dimensional disordered systems in a strong magnetic field is investigated by analysing the spectral fluctuations of the energy spectrum. The level spacing distribution…E. Hofstetter·Apr 16, 1996SaveLearn
Spin Instabilities in Coupled Semiconductor Quantum WellsWe study the magnetic phases of two coupled two-dimensional electron gases in order to determine under what circumstances these phases may occur in real semiconductor quantum wells and what the…P. I. Tamborenea, R. J. Radtke, S. Das Sarma·Apr 16, 1996SaveLearn
Short-time rotational diffusion in monodisperse charge-stabilized colloidal suspensionsWe investigate the combined effects of electrostatic interactions and hydrodynamic interactions on the short-time rotational self-diffusion coefficient in charge-stabilized suspensions. We calculate…M. Watzlawek, G. Naegele·Apr 16, 1996SaveLearn
Diffusive Spreading of Chainlike Molecules on SurfacesWe study the diffusion and submonolayer spreading of chainlike molecules on surfaces. Using the fluctuating bond model we extract the collective and tracer diffusion coefficients Dc and Dt with a…T. Ala-Nissila, S. Herminghaus, T. Hjelt et al.·Apr 16, 1996SaveLearn
On Bose-Einstein Condensation in any DimensionArbitrarily large ground state population is a general property of any ideal bose gas when conditions of degeneracy are satisfied; it occurs at any dimension D. For D = 1, the condensation is…H. Perez Rojas·Apr 16, 1996SaveLearn
Dynamics of Domains in Diluted AntiferromagnetsWe investigate the dynamics of two-dimensional site-diluted Ising antiferromagnets. In an external magnetic field these highly disordered magnetic systems have a domain structure which consists of…U. Nowak, J. Esser, K. D. Usadel·Apr 16, 1996SaveLearn
Theory for Dynamical Short Range Order and Fermi Surface Volume in Strongly Correlated SystemsUsing the fluctuation exchange approximation of the one band Hubbard model, we discuss the origin of the changing Fermi surface volume in underdoped cuprate systems due to the transfer of occupied…J. Schmalian, M. Langer, S. Grabowski et al.·Apr 16, 1996SaveLearn
Operator Product Expansion on a Fractal: The Short Chain Expansion for Polymer NetworksWe prove to all orders of renormalized perturbative polymer field theory the existence of a short chain expansion applying to polymer solutions of long and short chains. For a general polymer network…Christian von Ferber·Apr 15, 1996SaveLearn
New sum rules for an electron in a periodic or nearly periodic potentialI derive new sum rules for the electronic oscillator strengths in a periodic or nearly periodic potential, which apply within a single energy band and between any two bands. The physical origin of…Michael R. Geller·Apr 15, 1996SaveLearn
Plasma Oscillations in Layered SuperconductorsThis is a Review of experimental observations and theoretical developments on the c-axis plasma oscillations in High-temperature superconductors.Valery L. Pokrovsky·Apr 15, 1996SaveLearn
Tunneling into a periodically modulated Luttinger liquidWe study the tunneling into the edge of the Luttinger liquid with periodically modulated concentration of electrons. It is shown that the modulation,by causing a gap in the spectrum of plasmons,…A. Gramada, M. E. Raikh·Apr 15, 1996SaveLearn
Multifractality and multiscaling in two dimensional fragmentationWe consider two models (A and B) which can describe both two dimensional fragmentation and stochastic fractals. Model A exhibits multifractality on a unique support when describing a fragmentation…M K Hassan, G J Rodgers·Apr 15, 1996SaveLearn
Quantum Critical Behavior of Disordered SuperfluidsThe quantum critical behavior of an interacting, non-relativistic Bose theory with quenched disorder randomly distributed in space is investigated. The renormalization group is carried out in a…Adriaan M. J. Schakel·Apr 15, 1996SaveLearn
Flow Equations for Electron-Phonon InteractionsA recently proposed method of continuous unitary transformations is used to eliminate the interaction between electrons and phonons. The differential equations for the couplings represent an…Peter Lenz, Franz Wegner·Apr 15, 1996SaveLearn
Stable distribution in fragmentation processesWe introduce three models of fragmentation in which the largest fragment in the system can be broken at each time step with a fixed probability, p. We solve these models exactly in the long time…G J Rodgers, M K Hassan·Apr 15, 1996SaveLearn
Critical properties of the one-dimensional spin-1/2 antiferromagnetic Heisenberg model in the presence of a uniform fieldIn the presence of a uniform field the one-dimensional spin-12 antiferromagnetic Heisenberg model develops zero frequency excitations at field-dependent 'soft mode' momenta. We…A Fledderjohann, C Gerhardt, K H Mutter et al.·Apr 15, 1996SaveLearn
Spectral properties of quantum N-body systems versus chaotic properties of their mean field approximationsWe present numerical evidence that in a system of interacting bosons there exists a correspondence between the spectral properties of the exact quantum Hamiltonian and the dynamical chaos of the…Patrizia Castiglione, Giovanni Jona-Lasinio, Carlo Presilla·Apr 15, 1996SaveLearn