Excitation Spectrum of the Holstein ModelIn this paper the polaron problem for the Holstein model is studied in the weak coupling limit. We use second order perturbation theory to construct renormalized electron and phonons. Eigenstates of…J. M. Robin·Sep 11, 1998SaveLearn
Novel non-equilibrium critical behavior in unidirectionally coupled stochastic processesPhase transitions from an active into an absorbing, inactive state are generically described by the critical exponents of directed percolation (DP), with upper critical dimension dc = 4. In the…Y. Y. Goldschmidt, H. Hinrichsen, M. Howard et al.·Sep 10, 1998SaveLearn
Magnon splitting induced by charge ordering in NaV2O5We consider the effects of charge ordering in NaV2O5 (below TSP) on the exchange constants and on the magnon dispersion. We show that the experimentally observed splitting of the magnon branches…Cladius Gros, Roser Valenti·Sep 10, 1998SaveLearn
Improved Peierls Argument for High Dimensional Ising ModelsWe consider the low temperature expansion for the Ising model on d, d 2, with ferromagnetic nearest neighbor interactions in terms of Peierls contours. We prove that the expansion…J. L. Lebowitz, A. Mazel·Sep 10, 1998SaveLearn
Ground state energy of the f=1 spinor Bose-Einstein condensatesWe calculate, in the standard Bogoliubov approximation, the ground state energy of the spinor BEC with hyperfine spin f=1 where the two-body repulsive hard-core and spin exchange interactions are…W. -J. Huang, S. -C. Gou·Sep 10, 1998SaveLearn
Generalized stacking fault energetics and dislocation properties: compact vs. spread unit dislocation structures in TiAl and CuAuWe present a general scheme for analyzing the structure and mobility of dislocations based on solutions of the Peierls-Nabarro model with a two component displacement field and restoring forces…Oleg N. Mryasov, Yu. N. Gornostyrev, A. J. Freeman·Sep 10, 1998SaveLearn
Exact exchange-correlation potential for a time-dependent two electron systemWe obtain an exact solution of the time-dependent Schroedinger equation for a two-electron system confined to a plane by an isotropic parabolic potential whose curvature is periodically modulated in…Irene D'Amico, Giovanni Vignale·Sep 9, 1998SaveLearn
Liquid-Vapor Phase Transitions for Systems with Finite Range InteractionsWe consider particles in d, d ≥ 2 interacting via attractive pair and repulsive four-body potentials of the Kac type. Perturbing about mean field theory, valid when the interaction range…J. L. Lebowitz, A. Mazel, E. Presutti·Sep 9, 1998SaveLearn
Rigorous Proof of a Liquid-Vapor Phase Transition in a Continuum Particle SystemWe consider particles in Rd, d ≥ 2, interacting via attractive pair and repulsive four-body potentials of the Kac type. Perturbing about mean field theory, valid when the interaction…J. L. Lebowitz, A. E. Mazel, E. Presutti·Sep 9, 1998SaveLearn
Analysis of a Population Genetics Model with Mutation, Selection, and PleiotropyWe investigate the behavior of a population genetics model introduced by Waxman and Peck incorporating mutation, selection, and pleiotropy. The population is infinite and continuous variation of…S. N. Coppersmith, Robert D. Blank, Leo P. Kadanoff·Sep 9, 1998SaveLearn
Closed timelike curves in superfluid 3HeIt is shown that the curved spacetime induced in a thin film of superfluid 3He-A by the presence of symmetric vortices with the unbroken symmetry phase, admits the existence of closed timelike…Pedro F. Gonzalez-Diaz, Carmen L. Siguenza·Sep 9, 1998SaveLearn
Fractionated crystallisation in a polydisperse mixture of hard spheresWe consider the nature of the fluid-solid phase transition in a polydisperse mixture of hard spheres. For a sufficiently polydisperse mixture crystallisation occurs with simultaneous fractionation.…P. Bartlett·Sep 8, 1998SaveLearn
Non perturbative renormalization group approach to surface growthWe present a recently introduced real space renormalization group (RG) approach to the study of surface growth. The method permits us to obtain the properties of the KPZ strong coupling fixed point,…M. A. Muñoz, G. Bianconi, C. Castellano et al.·Sep 8, 1998SaveLearn
Cannon for Neutral ParticlesDynamics of spin-polarized neutral particles, such as neutrons or neutral atoms and molecules, in magnetic fields is studied. A new regime of motion is found where particles move mainly in one…V. I. Yukalov, E. P. Yukalova·Sep 7, 1998SaveLearn
Exact Results on Sinai's DiffusionWe study the continuum version of Sinai's problem of a random walker in a random force field in one dimension. A method of stochastic representations is used to represent various probability…Alain Comtet, David S. Dean·Sep 7, 1998SaveLearn
Metallic temperature dependence of resistivity in perchlorate doped polyacetyleneWe have measured the electrical resistivity (ρ) and the thermoelectric power (TEP) of the perchlorate (ClO4-) doped stretch oriented polyacetylene (PA) film. For the highly conducting samples…Y. W. Park, E. S. Choi, D. S. Suh·Sep 7, 1998SaveLearn
Multifractal dimension spectra in polymer physicsWe study the multifractal properties of diffusion in the presence of an absorbing polymer and report the numerical values of the multifractal dimension spectra for the case of an absorbing self…Christian von Ferber, Yurij Holovatch·Sep 7, 1998SaveLearn
Symmetry Structure of the Elser-Sloane QuasicrystalThe 4D quasicrystal of Elser and Sloane, obtained from the root lattice E8 by the cut-and-project method, can be parametrized by the points of an 8D torus. This allows for an explicit analysis of its…Michael Baake, Franz Gähler·Sep 5, 1998SaveLearn
Interacting hard-core bosons and surface prerougheningThe theory of the preroughening transition of an unreconstructed surface, and the ensuing disordered flat (DOF) phase, is formulated in terms of interacting steps. Finite terraces play a crucial role…Alessandro Laio, Giuseppe Santoro, Erio Tosatti·Sep 4, 1998SaveLearn
Spectral function of the spiral spin state in the trestle and ladder Hubbard modelEder and Ohta have found a violation of the Luttinger rule in the spectral function for the t-t'-J model, which was interpreted as a possible breakdown of the Tomonaga-Luttinger(TL) description…Ryotaro Arita, Koichi Kusakabe, Kazuhiko Kuroki et al.·Sep 4, 1998SaveLearn
Microscopic Theory of High Temperature SuperconductivityIt is argued that the BCS many-body theory, which is outstandingly successful for conventional superconductors, does not apply to the high temperature superconductors and that a realistic theory must…V. J. Emery, S. A. Kivelson·Sep 4, 1998SaveLearn
Fractional Calculus as a Macroscopic Manifestation of RandomnessWe generalize the method of Van Hove so as to deal with the case of non-ordinary statistical mechanics, that being phenomena with no time-scale separation. We show that in the case of ordinary…P. Grigolini, A. Rocco, B. J. West·Sep 3, 1998SaveLearn
Stripe Liquid, Crystal, and Glass Phases of Doped AntiferromagnetsA largely descriptive survey is given of the ordered phases of doped antiferromagnets, and of the long wavelength properties that can be derived from an order-parameter theory. In particular, we show…S. A. Kivelson, V. J. Emery·Sep 3, 1998SaveLearn
End-Chain Spin Effects in Haldane Gap MaterialsThis paper overviews the behavior of the end-chain spins of linear chain systems possessing a Haldane gap. The physical properties of the end-chain spins are described by reviewing the results…Mark W. Meisel·Sep 3, 1998SaveLearn
Correlations in the impenetrable electron gasWe consider non-relativistic electrons in one dimension with infinitely strong repulsive delta function interaction. We calculate the long-time, large-distance asymptotics of field-field correlators…F. Göhmann, A. R. Its, V. E. Korepin·Sep 3, 1998SaveLearn