Generalization of Gutzwiller ApproximationWe derive expressions required in generalizing the Gutzwiller approximation to models comprising arbitrarily degenerate localized orbitals.Takuya Okabe·Apr 22, 1997SaveLearn
Far-infrared edge modes in quantum dotsWe have investigated edge modes of different multipolarity sustained by quantum dots submitted to external magnetic fields. We present a microscopic description based on a variational solution of the…E. Lipparini, N. Barberan, M. Barranco et al.·Apr 17, 1997SaveLearn
Random matrix models with log-singular level confinement: method of fictitious fermionsJoint distribution function of N eigenvalues of U(N) invariant random-matrix ensemble can be interpreted as a probability density to find N fictitious non-interacting fermions to be confined in a…E. Kanzieper, V. Freilikher·Apr 17, 1997SaveLearn
Low-Temperature Series for the Square Lattice Potts Model by the Improved Finite-Lattice MethodThe low-temperature series are calculated for the free energy, magnetization and susceptibility in the Q-state Potts model on the square lattice, using the improved algorithm of the finite lattice…H. Arisue, K. Tabata·Apr 17, 1997SaveLearn
Fluctuations around Nash Equilibria in Game TheoryWe investigate the fluctuations induced by irrationality in simple games with a large number of competing players. We show that Nash equilibria in such games are ``weakly'' stable:…M. Marsili, Y. -C. Zhang·Apr 16, 1997SaveLearn
One-Electron Spectral Functions of the Attractive Hubbard Model for Intermediate CouplingWe calculate the one-electron spectral function of the attractive (negative-U) Hubbard model. We work in the intermediate coupling and low density regime and obtain the self-energy in an…Maxim Yu. Kagan, Raymond Frésard, Massimiliano Capezzali et al.·Apr 16, 1997SaveLearn
Large financial crashesWe propose that large stock market crashes are analogous to critical points studied in statistical physics with log-periodic correction to scaling. We extend our previous renormalization group model…Didier Sornette, Anders Johansen·Apr 15, 1997SaveLearn
Character of electron reflection at a normal metal-Peierls semiconductor boundaryThe reflection of electrons incident from a normal metal on the boundary of the metal with a quasi-one-dimensional conductor containing a charge-density wave (CDW) is investigated theoretically. It…S. N. Artemenko, S. V. Remizov·Apr 15, 1997SaveLearn
The Microscopic Model of Composite Fermion Type Excitations for ν=1/m Edge StatesWe derive a microscopic theory of the composite fermion type quasiparticles describing the low-lying edge excitations in the fractional quantum Hall liquid with ν=1/m. Using the composite fermion…Yue Yu, Zongyuan Zhu·Apr 15, 1997SaveLearn
Spin Gap and Superconductivity in the Interlayer Pair Tunneling ModelA simple interlayer pair tunneling is solved exactly. We find that in the normal state spin-1/2 particle and hole excitations are gapped. But the state is an unusual metal, characterized by novel…Sanjoy K. Sarker, Philip W. Anderson·Apr 14, 1997SaveLearn
Weak Chaos in a Quantum Kepler ProblemTransition from regular to chaotic dynamics in a crystal made of singular scatterers U(r)=λ|r|-σ can be reached by varying either sigma or lambda. We map the problem to a localization problem,…B. L. Altshuler, L. S. Levitov·Apr 14, 1997SaveLearn
The phase plane of moving discrete breathersWe study anharmonic localization in a periodic five atom chain with quadratic-quartic spring potential. We use discrete symmetries to eliminate the degeneracies of the harmonic chain and easily find…Paul A. Houle·Apr 14, 1997SaveLearn
Temperature Dependent Resistivity of Single Wall Carbon NanotubesNonchiral single wall carbon nanotubes with an "armchair" wrapping are theoretically predicted to be conducting, and high purity samples consisting predominantly of these tubes exhibit…C. L. Kane, E. J. Mele, R. S. Lee et al.·Apr 14, 1997SaveLearn
Cluster Heat Bath Algorithm in Monte Carlo Simulations of Ising ModelsWe have proposed a cluster heat bath method in Monte Carlo simulations of Ising models in which one of the possible spin configurations of a cluster is selected in accordance with its Boltzmann…F. Matsubara, A. Sato, O. Koseki et al.·Apr 14, 1997SaveLearn
Permutation symmetry and magic numbers of few-electron systemsThis paper has been withdrawn by Wenji Deng (e-mail: phwjdeng@scut.edu.cn) for further modification at Oct. 12, 1998. PACS: 03.75.Fi, 05.30.Jp.64.60.-i, 32.80.PjWenji Deng, P. M. Hui·Apr 13, 1997SaveLearn
Localization in Highly Anisotropic SystemsThe localization behavior of the Anderson model with anisotropic hopping integral t for weakly coupled planes and weakly coupled chains is investigated both numerically with the transfer matrix…Qiming Li, C. M. Soukoulis, I. Zambetaki et al.·Apr 13, 1997SaveLearn
Lattice Color Groups of QuasicrystalsLattice color groups are introduced and used to study the partitioning of a periodically- or quasiperiodically-ordered set of points into N symmetry-related subsets. Applications range from magnetic…Ron Lifshitz·Apr 12, 1997SaveLearn
Bose-Einstein condensation of finite number of confined particlesThe partition function and specific heat of a system consisting of a finite number of bosons confined in an external potential are calculated in canonical ensemble. Using the grand partition function…Wenji Deng, P. M. Hui·Apr 12, 1997SaveLearn
Scaling Properties in Highly Anisotropic SystemsScaling of the conductances and the finite-size localization lengths is generalized to anisotropic systems and tested in two dimensional systems. Scaling functions of isotropic systems are recovered…Qiming Li, C. M. Soukoulis, S. Katsoprinakis et al.·Apr 11, 1997SaveLearn
Understanding High Temperature Superconductors: Progress and ProspectsI review progress in measurements of the dynamic spin susceptibility in the normal state which yield a new phase diagram and discuss microscopic calculations which yield qualitative, and in many…David Pines·Apr 11, 1997SaveLearn
Excitation Spectrum and Superexchange Pathways in the Spin Dimer VODPO4 . 1/2 D2OMagnetic excitations have been investigated in the spin dimer material VODPO4 · 1/2 D2O using inelastic neutron scattering. A dispersionless magnetic mode was observed at an energy of 7.81(4)…D. A. Tennant, S. E. Nagler, A. W. Garrett et al.·Apr 10, 1997SaveLearn
Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)2P2O7Magnetic excitations in an array of (VO)2P2O7 single crystals have been measured using inelastic neutron scattering. Until now, (VO)2P2O7 has been thought of as a two-leg antiferromagnetic…A. W. Garrett, S. E. Nagler, D. A. Tennant et al.·Apr 10, 1997SaveLearn
The 3-d Random Field Ising Model at zero temperatureWe study numerically the zero temperature Random Field Ising Model on cubic lattices of various linear sizes L in three dimensions. For each random field configuration we vary the ferromagnetic…J. -C. Anglès d'Auriac, N. Sourlas·Apr 10, 1997SaveLearn
Non ergodic quantum behaviour in classically chaotic 3D billiardsWe study, analytically and numerically, the classical and quantum properties of a nearly spherical 3D billiard. In particular we show the appearence of quantum non ergodic behaviour and of the…Giulio Casati, Tomaz Prosen·Apr 10, 1997SaveLearn
Normal-state magnetic susceptibility in a bilayer cuprateThe magnetic susceptibility of high-Tc superconductors is investigated in the normal state using a coupled bilayer model. While this model describes in a natural way the normal-state pseudogaps seen…W. C. Wu, B. W. Statt, Ya-Wei Hsueh et al.·Apr 9, 1997SaveLearn