A Model for the Thermodynamics of Globular ProteinsComments: 6 pages RevTeX, 6 Postscript figures. We review a statistical mechanics treatment of the stability of globular proteins based on a simple model Hamiltonian taking into account protein self…Alex Hansen, Mogens H. Jensen, Kim Sneppen et al.·May 25, 1999SaveLearn
A new method for detection of exciton Bose condensation using stimulated two-photon emissionStimulated two-photon emission by Bose-condensed excitons accompanied by a coherent two-exciton recombination, i.e., by simultaneous recombination of two excitons with opposite momenta leaving…Yu. E. Lozovik, A. V. Poushnov·May 24, 1999SaveLearn
Ab initio Hartree-Fock computation of electronic static structure factor of crystalline insulators: benchmark results on LiFIn this paper we present a fully ab initio Hartree-Fock approach aimed at calculating the static structure factor of crystalline insulators at arbitrary values of momentum transfer. In particular, we…Alok Shukla·May 24, 1999SaveLearn
Fragmented and Single Condensate Ground States of Spin-1 Bose GasWe show that the ground state of a spin-1 Bose gas with an antiferro- magnetic interaction is a fragmented condensate in uniform magnetic fields. The number fluctuations in each spin component change…Tin-Lun Ho, Sung Kit Yip·May 24, 1999SaveLearn
Topological Gauge Theory Of General Weitzenbock Manifolds Of Dislocations In CrystalsGeneral Weitzenbock material manifolds of dislocations in crystals Are proposed, the reference, idealized and deformation states of the bodies in general case are generally described by the general…Y. C. Huang, B. L. Lin, S. Li et al.·May 23, 1999SaveLearn
Thermodynamical Properties of a Spin 1/2 Heisenberg Chain Coupled to PhononsWe performed a finite-temperature quantum Monte Carlo simulation of the one-dimensional spin-1/2 Heisenberg model with nearest-neighbor interaction coupled to Einstein phonons. Our method allows to…Rainer W. Kühne, Ute Löw·May 22, 1999SaveLearn
Defect formation in inhomogeneous 2-nd order phase transition: theory and experimentThe status quo in our understanding of defect formation during a rapid transition into the broken symmetry state in condensed matter and cosmology is discussed. An observation of vortex nucleation in…G. E. Volovik·May 21, 1999SaveLearn
Wavefunction-based correlated ab initio calculations on crystalline solidsWe present a wavefunction-based approach to correlated ab initio calculations on crystalline insulators of infinite extent. It uses the representation of the occupied and the unoccupied (virtual)…Alok Shukla, Michael Dolg, Peter Fulde et al.·May 21, 1999SaveLearn
Dynamics of ripple formation in sputter erosion: nonlinear phenomenaMany morphological features of sputter eroded surfaces are determined by the balance between ion induced linear instability and surface diffusion. However, the impact of the nonlinear terms on the…S. Park, B. Kahng, H. Jeong et al.·May 21, 1999SaveLearn
Structure and Dynamics of Liquid Iron under Earth's Core ConditionsFirst-principles molecular dynamics simulations based on density-functional theory and the projector augmented wave (PAW) technique have been used to study the structural and dynamical properties of…D. Alfe`, G. Kresse, M. J. Gillan·May 21, 1999SaveLearn
Relativistic Quantum Thermodynamics of Ideal Gases in 2 DimensionsIn this work we study the behavior of relativistic ideal Bose and Fermi gases in two space dimensions. Making use of polylogarithm functions we derive a closed and unified expression for their…H. Blas, B. M. Pimentel, J. L. Tomazelli·May 20, 1999SaveLearn
Observation of breathers in Josephson laddersWe report on the observation of spatially-localized excitations in a ladder of small Josephson junctions. The excitations are whirling states which persist under a spatially-homogeneous force due to…P. Binder, D. Abraimov, A. V. Ustinov et al.·May 19, 1999SaveLearn
Tunneling singularities in the open Hubbard chainWe study singularities in the I-V characteristics for sequential tunneling from resonant localized levels (e.g. a quantum dot) into a one dimensional electron system described by a Hubbard model.…Holger Frahm, Gerald Bedürftig·May 19, 1999SaveLearn
Solitons in SO(5) SuperconductivityA model unifying superconductivity and antiferromagnetism using an underlying approximate SO(5) symmetry has injected energy into the field of high-temperature superconductivity. This model might…R. MacKenzie, J. M. Cline·May 19, 1999SaveLearn
Transverse ordering of an antiferromagnet in a field with oblique angle to the easy axisMotivated by the recent experimental observations [Phys Rev B 57 R11051 (1998)] of transverse spin ordering in FeBr2 induced by a magnetic field with oblique angle to the easy axis of the system, we…M. Acharyya, U. Nowak, K. D. Usadel·May 19, 1999SaveLearn
Thick surface flows of granular materials: The effect of the velocity profile on the avalanche amplitudeA few years ago, Bouchaud al. introduced a phenomenological model to describe surface flows of granular materials [J. Phys. Fr. I, 4, 1383 (1994)]. According to this model, one can distinguish…Achod Aradian, Elie Raphael, Pierre-Gilles de Gennes·May 19, 1999SaveLearn
Infrared and Raman studies of the Verwey transition in magnetiteWe present infrared and Raman measurements of magnetite (Fe3O4). This material is known to undergo a metal-insulator and a structural transition (Verwey transition) at TV=120K. At temperatures…L. V. Gasparov, D. B. Tanner, D. B. Romero et al.·May 19, 1999SaveLearn
Hydrodynamic Excitations of Trapped Fermi GasesWe discuss collective excitations of a trapped dilute Fermi gas within a hydrodynamic approximation. Analytical results are derived for both high- and low-temperature limits and are applied to…Georg M. Bruun, Charles W. Clark·May 18, 1999SaveLearn
Quantum Return Probability for Substitution PotentialsWe propose an effective exponent ruling the algebraic decay of the average quantum return probability for discrete Schrodinger operators. We compute it for some non-periodic substitution potentials…Cesar R. de Oliveira, Giancarlo Q. Pellegrino·May 18, 1999SaveLearn
High-Temperature Series Analysis of the Free Energy and Susceptibility of the 2D Random-Bond Ising ModelWe derive high-temperature series expansions for the free energy and susceptibility of the two-dimensional random-bond Ising model with a symmetric bimodal distribution of two positive coupling…Alexandra Roder, Joan Adler, Wolfhard Janke·May 18, 1999SaveLearn
Valence band photoemission from the GaN(0001) surfaceA detailed investigation by one-step photoemission calculations of the GaN(0001)-(1x1) surface in comparison with recent experiments is presented in order to clarify its structural properties and…T. Strasser, C. Solterbeck, F. Starrost et al.·May 18, 1999SaveLearn
Quantum Statistical Mechanics of Nonrelativistic Membranes: Crumpling Transition at Finite TemperatureThe effect of quantum fluctuations on a nearly flat, nonrelativistic two-dimensional membrane with extrinsic curvature stiffness and tension is investigated. The renormalization group analysis is…M. E. S. Borelli, H. Kleinert, Adriaan M. J. Schakel·May 17, 1999SaveLearn
Two electron view on metal-insulator transition in two dimensionsThe model of two electrons with Coulomb interaction on a two-dimensional (2D) disordered lattice is considered. It is shown that the interaction can give a sharp transition to delocalized states in a…D. L. Shepelyansky·May 17, 1999SaveLearn
String Picture of Bose-Einstein CondensationA nonrelativistic Bose gas is represented as a grand-canonical ensemble of fluctuating closed spacetime strings of arbitrary shape and length. The loops are characterized by their string tension and…S. Bund, Adriaan M. J. Schakel·May 14, 1999SaveLearn
Symmetric patterns of dislocations in Thomson's problemDetermination of the classical ground state arrangement of N charges on the surface of a sphere (Thomson's problem) is a challenging numerical task. For special values of N we have obtained…A. Perez-Garrido, M. A. Moore·May 14, 1999SaveLearn