Theory of the ac Hall response of a model with X-ray edge Singularities in infinite dimensionsWe study the ac magnetotransport in a non-Fermi liquid metal, which possesses explicit x-ray edge singularities in d=∞. Specifically, we compute the ac conductivity tensor in a formalism that…Mukul S. Laad, Luis Craco·Jun 5, 1998SaveLearn
Hyper-sparsity of the density matrix in a wavelet representationO(N) methods are based on the decay properties of the density matrix in real space, an effect sometimes refered to as near-sightedness. We show, that in addition to this near-sightedness in real…S. Goedecker, O. V. Ivanov·Jun 5, 1998SaveLearn
A new test for random number generators: Schwinger-Dyson equations for the Ising modelWe use a set of Schwinger-Dyson equations for the Ising Model to check several random number generators. For the model in two and three dimensions, it is shown that the equations are sensitive tests…H. G. Ballesteros, V. Martin-Mayor·Jun 4, 1998SaveLearn
Electrodymanics of Moving Continuous Media with Toroid PolarizationWith regard to the toroid contributions, a modified system of equations of electrodynamics moving continuous media has been obtained. Alternative formalisms to introduce the toroid moment…V. M. Dubovik, B. Saha·Jun 4, 1998SaveLearn
Theory of Bose-Einstein condensation in trapped gasesThe phenomenon of Bose-Einstein condensation of dilute gases in traps is reviewed from a theoretical perspective. Mean-field theory provides a framework to understand the main features of the…F. Dalfovo, S. Giorgini, L. P. Pitaevskii et al.·Jun 3, 1998SaveLearn
Electrodymanics with Toroid PolarizationA modified system of equations of electrodynamics has been obtained. Beside the Lagrangian one an alternative gauge-like formalism has been developed to introduce the toroid moment contributions in…V. M. Dubovik, B. Saha·Jun 3, 1998SaveLearn
Theory and data analysis for excitations in liquid 4He beyond the roton minimumThe hybridization of the single-excitation branch with the two-excitation continuum in the momentum region beyond the roton minimum is reconsidered by including the effect of the interference term…F. Pistolesi·Jun 3, 1998SaveLearn
The Self-Trapping Line of the Holstein Molecular Crystal Model in One DimensionThe ground state of the Holstein molecular crystal model in one dimension is studied using the Global-Local variational method, analyzing in particular the total energy, kinetic energy, phonon…A. H. Romero, David W. Brown, Katja Lindenberg·Jun 2, 1998SaveLearn
Electronic Kinetic Energy in the Polaron Ground State and the Location of the Self-Trapping TransitionIn this paper we discuss the electronic kinetic energy in the ground state of the Holstein Hamiltonian in one space dimension using the Global-Local variational method together with perturbation…A. H. Romero, David W. Brown, Katja Lindenberg·Jun 2, 1998SaveLearn
Lattice Dimerization in the Spin-Peierls Compound CuGeO3The uniaxial pressure dependences of the exchange coupling and the structural distortion in the dimerized phase of CuGeO3 are analyzed. A minimum magnetic dimerization of 3 % is obtained,…B. Büchner, H. Fehske, A. P. Kampf et al.·Jun 2, 1998SaveLearn
Induced Gravity in Superfluid 3HeThe gapless fermionic excitations in superfluid 3He-A have the "relativistic" spectrum close to the gap nodes. This allowed us to model the modern cosmological scenaria of baryogenesis and…G. E. Volovik·Jun 1, 1998SaveLearn
Microscopic description of the surface dipole plasmon in large NaN clusters (950 < N < 12050)Fully microscopic RPA/LDA calculations of the dipole plasmon for very large neutral and charged sodium clusters, NaNZ+, in the size range 950 < N < 12050 are presented for the first time. 60…Constantine Yannouleas·Jun 1, 1998SaveLearn
Probing the Gauge Structure of high-temperature superconductorsWe suggest that a spin-charge separating ansatz, leading to non-Abelian SU(2) US(1) gauge symmetries in doped antiferromagnets, proposed earlier as a way of describing Kosterlitz-Thouless…K. Farakos, G. Koutsoumbas, N. E. Mavromatos·May 29, 1998SaveLearn
Thermodynamics of the (1,1/2) Ferrimagnet in Finite Magnetic FieldsWe investigate the specific heat and magnetisation of a ferrimagnet with gS=1 and S=1/2 spins in a finite magnetic field using the transfer matrix DMRG down to T=0.025J. Ferromagnetic gapless and…K. Maisinger, U. Schollwoeck, S. Brehmer et al.·May 28, 1998SaveLearn
Diffusive and subdiffusive step dynamicsThe dynamics of steps on crystal surfaces is considered. In general, the meandering of the steps obeys a subdiffusive behaviour. The characteristic asymptotic time laws depend on the microscopic…W. Selke, M. Bisani·May 28, 1998SaveLearn
Vortices in Bose-Einstein-Condensed Atomic CloudsThe properties of vortex states in a Bose-Einstein condensed cloud of atoms are considered at zero temperature. Using both analytical and numerical methods we solve the time-dependent…Emil Lundh, C. J. Pethick, H. Smith·May 27, 1998SaveLearn
Charge ordering and long-range interactions in layered transition metal oxidesWe study the competition between long-range and short-range interactions among holes within the spin density wave picture of layered transition metal oxides. We focus on the problem of charge…Branko P. Stojkovic, Z. G. Yu, A. R. Bishop et al.·May 27, 1998SaveLearn
Quantum Skyrmions and the Destruction of Antiferromagnetic Order in High-Temperature SuperconductorsA continuous field theory which describes the process of doping in high-Tc superconductors of the YBCO-type is presented. It is shown that the introduction of dopants produces the creation of…E. C. Marino·May 27, 1998SaveLearn
Unified Treatment of Asymptotic van der Waals ForcesIn a framework for long-range density-functional theory we present a unified full-field treatment of the asymptotic van der Waals interaction for atoms, molecules, surfaces, and other objects. The…Erika Hult, Henrik Rydberg, Bengt I. Lundqvist et al.·May 27, 1998SaveLearn
A hidden symmetry of collisionless sound of Bose condensates in anisotropic trapsWe derive a symmetry property for the Fourier-transform of the collisionless sound modes of Bose condensates in anisotropic traps connected with a somewhat hidden conservation law. We discuss its…Martin Fliesser, Robert Graham·May 26, 1998SaveLearn
Scalar potential effect in an integrable Kondo modelTo study the impurity potential effect to the Kondo problem in a Luttinger liquid, we propose an integrable model of two interacting half-chains coupled with a single magnetic impurity…Yupeng Wang, U. Eckern·May 25, 1998SaveLearn
Spiky Phases of Smooth Membranes. Implications for Smooth StringsWe point out a possible mechanism by which smooth surfaces can become spiky as the constant of curvature stiffness κ falls below certain critical values. This happens either in a single first-order…H. Kleinert·May 25, 1998SaveLearn
Measurements of Relative Phase in Binary Mixtures of Bose-Einstein CondensatesWe have measured the relative phase of two Bose-Einstein condensates (BEC) using a time-domain separated-oscillatory-field condensate interferometer. A single two-photon coupling pulse prepares the…D. S. Hall, M. R. Matthews, C. E. Wieman et al.·May 25, 1998SaveLearn
Inter-Condensate Tunneling in Bose-Einstein Condensates with Feshbach ResonancesRecently, effects of Feshbach resonances in atom-atom interactions were observed by varying the external magnetic field of an atomic Bose-Einstein condensate (BEC). We point out that the quasi-bound…Eddy Timmermans, Paolo Tommasini, Robin Cote et al.·May 25, 1998SaveLearn
Exact Eigenstates of Tight-Binding Hamiltonians on the Penrose TilingWe investigate exact eigenstates of tight-binding models on the planar rhombic Penrose tiling. We consider a vertex model with hopping along the edges and the diagonals of the rhombi. For the wave…Przemyslaw Repetowicz, Uwe Grimm, Michael Schreiber·May 25, 1998SaveLearn