Slow dynamics of water under pressureWe perform lengthy molecular dynamics simulations of the SPC/E model of water to investigate the dynamics under pressure at many temperatures and compare with experimental measurements. We calculate…Francis W. Starr, Stephen Harrington, Francesco Sciortino et al.·Jan 7, 1999SaveLearn
Study of a Nonlocal Density scheme for electronic--structure calculationsAn exchange-correlation energy functional beyond the local density approximation, based on the exchange-correlation kernel of the homogeneous electron gas and originally introduced by Kohn and Sham,…Maurizia Palummo, Giovanni Onida, Rodolfo Del Sole·Jan 7, 1999SaveLearn
``Smoke Rings'' in FerromagnetsIt is shown that bulk ferromagnets support propagating non-linear modes that are analogous to the vortex rings, or ``smoke rings'', of fluid dynamics. These are circular loops of …N. R. Cooper·Jan 6, 1999SaveLearn
Universal Behavior of Quantum Impurity Scattering in Tomonaga-Luttinger LiquidUsing bosonization and path integral methods, we study general low temperature behavior of non-magnetic and magnetic impurity scattering in Tomonaga-Luttinger liquid, and calculate electron Green…Yu-Liang Liu·Jan 6, 1999SaveLearn
Molecular Orbital Models of Benzene, Biphenyl and the OligophenylenesA two state (2-MO) model for the low-lying long axis-polarised excitations of poly(p-phenylene) oligomers and polymers is developed. First we derive such a model from the underlying…R. J. Bursill, W. Barford, H. Daly·Jan 6, 1999SaveLearn
Issues and Observations on Applications of the Constrained-Path Monte Carlo Method to Many-Fermion SystemsWe report several important observations that underscore the distinctions between the constrained-path Monte Carlo method and the continuum and lattice versions of the fixed-node method. The main…J. Carlson, J. E. Gubernatis, G. Ortiz et al.·Jan 6, 1999SaveLearn
Imprints of log-periodic self-similarity in the stock marketDetailed analysis of the log-periodic structures as precursors of the financial crashes is presented. The study is mainly based on the German Stock Index (DAX) variation over the 1998 period which…S. Drozdz, F. Ruf, J. Speth et al.·Jan 5, 1999SaveLearn
A low-temperature dynamic mode scanning force microscope operating in high magnetic fieldsA scanning force microscope was implemented operating at temperatures below 4.2K and in magnetic fields up to 8T. Piezoelectric quartz tuning forks were employed for non optical tip-sample distance…J. Rychen, T. Ihn, P. Studerus et al.·Jan 5, 1999SaveLearn
Noise Stabilization of Self-Organized MemoriesWe investigate a nonlinear dynamical system which ``remembers'' preselected values of a system parameter. The deterministic version of the system can encode many parameter values during a…M. L. Povinelli, S. N. Coppersmith, L. P. Kadanoff et al.·Dec 31, 1998SaveLearn
Local modes, phonons, and mass transport in solid 4HeWe propose a model to treat the local motion of atoms in solid 4He as a local mode. In this model, the solid is assumed to be described by the Self Consistent Harmonic approximation, combined…N. Gov, E. Polturak·Dec 30, 1998SaveLearn
Phase diagram of a Heisenberg spin-Peierls model with quantum phononsUsing a new version of the density-matrix renormalization group we determine the phase diagram of a model of an antiferromagnetic Heisenberg spin chain where the spins interact with quantum phonons.…Robert J. Bursill, Ross H. McKenzie, Chris J. Hamer·Dec 29, 1998SaveLearn
Orientational Phase Transition in Solid C60: A Model ApproachA simple model for the angular dependent interaction between C60 molecules in face centered cubic lattice is proposed and analyzed by use of the rigorous bifurcation approach. The quantitative…T. I. Schelkacheva, E. E. Tareyeva·Dec 29, 1998SaveLearn
On the symmetry of excitations in SU(2) Bethe Ansatz systemsUsing the XXX Heisenberg chain as an example, based on the symmetry properties of the eigenstates with respect to reversing all the spins we argue, that the basic SU(2) symmetry of the model is…F. Woynarovich·Dec 29, 1998SaveLearn
Tunneling into fractional quantum Hall liquidsMotivated by the recent experiment by Grayson et.al., we investigate a non-ohmic current-voltage characteristics for the tunneling into fractional quantum Hall liquids. We give a possible explanation…Ken-ichiro Imura·Dec 27, 1998SaveLearn
Field theory in superfluid 3He: What are the lessons for particle physics, gravity and high-temperature superconductivity?There are several classes of homogeneous Fermi-systems which are characterized by the topology of the energy spectrum of fermionic quasiparticles: (1) Gapless systems with a Fermi-surface; (2)…G. E. Volovik·Dec 23, 1998SaveLearn
Dynamical Correlation Functions using the Density Matrix Renormalization GroupThe density matrix renormalization group (DMRG) method allows for very precise calculations of ground state properties in low-dimensional strongly correlated systems. We investigate two methods to…Till D. Kuehner, Steven R. White·Dec 22, 1998SaveLearn
Phase diagram of quantized vortices in a trapped Bose-Einstein condensed gasWe investigate the thermodynamic stability of quantized vortices in a dilute Bose gas confined by a rotating harmonic trap at finite temperature. Interatomic forces play a crucial role in…S. Stringari·Dec 22, 1998SaveLearn
Successive transitions and intermediate chiral phase in a superfuilid 3He filmSuperfluidity ordering of thin 3He films is studied by Monte Carlo simulations based on a two-dimensional lattice spin model with Z2× U(1)× SO(3) symmetry. Successive phase transitions…Hikaru Kawamura·Dec 22, 1998SaveLearn
On Superconductors,Superfluids and Torsion VorticesThe Meissner effect for superconductors in spacetimes with torsion is revisited. Two new physical interpretations are presented. The first considers the Landau-Ginzburg theory yields a new…L. C. Garcia de Andrade·Dec 22, 1998SaveLearn
Observation of p-wave Threshold Law Using Evaporatively Cooled Fermionic AtomsWe have measured independently both s-wave and p-wave cross-dimensional thermalization rates for ultracold potassium-40 atoms held in a magnetic trap. These measurements reveal that this fermionic…B. DeMarco, J. L. Bohn, J. P. Burke, et al.·Dec 22, 1998SaveLearn
A density matrix renormalisation group algorithm for quantum lattice systems with a large number of states per siteA variant of White's density matrix renormalisation group scheme which is designed to compute low-lying energies of one-dimensional quantum lattice models with a large number of degrees of…R. J. Bursill·Dec 22, 1998SaveLearn
Rheology, and how to stop agingRecent analytical developments in glass theory are equally relevant to the understanding of anomalous rheology, with characteristic features such as the Reynolds dilatancy and the driving-power…Jorge Kurchan·Dec 21, 1998SaveLearn
Lifetimes of impurity states in crossed magnetic and electric fieldsWe study the quantum dynamics of localized impurity states created by a point interaction for an electron moving in two dimensions under the influence of a perpendicular magnetic field and an…Sebastien Gyger, Philippe A. Martin·Dec 21, 1998SaveLearn
New state of the matter between the Fermi glass and the Wigner crystal in two dimensionsSpinless fermions with Coulomb interaction in a square disordered lattice form a new state of the matter which is nor a Fermi glass, neither a Wigner crystal for intermediate Coulomb interaction.…Giuliano Benenti, Xavier Waintal, Jean-Louis Pichard·Dec 21, 1998SaveLearn
Bose-Glass behaviour in Bi2Sr2Ca1-xYxCu2O8 crystals with columnar defects: experimental evidence for variable-range hoppingWe report on vortex transport in Bi2Sr2Ca1-xYxCu2O8 crystals irradiated at different doses of heavy ions. We show evidence of a flux-creep resistivity typical of a variable-range…J. C. Soret, L. Ammor, V. Ta Phuoc et al.·Dec 21, 1998SaveLearn