Hikami boxes and the Sinai billiardDiagram, known in theory of the Anderson localization as the Hikami box, is computed for the Sinai billiard. This interference effect is mostly important for trajectories tangent to the opening of…Daniel L. Miller·Dec 21, 1998SaveLearn
Numerical diagonalization analysis of the ground-state superfluid-localization transition in two dimensionsGround state of the two-dimensional hard-core-boson system in the presence of the quenched random chemical potential is investigated by means of the exact-diagonalization method for the system sizes…Yoshihiro Nishiyama·Dec 20, 1998SaveLearn
Two-fluid dynamics for a Bose-Einstein condensate out of local equilibrium with the non-condensateWe extend our recent work on the two-fluid hydrodynamics of a Bose-condensed gas by including collisions involving both condensate and non-condensate atoms. These collisions are essential for…T. Nikuni, E. Zaremba, A. Griffin·Dec 18, 1998SaveLearn
Operator method in solving non-linear equations of the Hartree-Fock typeThe operator method is used to construct the solutions of the problem of the polaron in the strong coupling limit and of the helium atom on the basis of the Hartree-Fock equation.…Le Anh Thu, L I Komarov·Dec 18, 1998SaveLearn
Nonequilibrium effects in the tunneling conductance spectra of small metallic particlesThe tunneling spectra of small metallic grains shows an unusual structure of the differential conductance peaks. Namely, resonance peaks appear in clusters, or develop substructure as the the gate…Oded Agam·Dec 18, 1998SaveLearn
Coupled Hartree-Fock-Bogoliubov kinetic equations for a trapped Bose gasUsing the Kadanoff-Baym non-equilibrium Green's function formalism, we derive the self-consistent Hartree-Fock-Bogoliubov (HFB) collisionless kinetic equations and the associated equation of…Milena Imamovic-Tomasovic, Allan Griffin·Dec 16, 1998SaveLearn
Backflow and dissipation during the quantum decay of a metastable Fermi liquidThe particle current in a metastable Fermi liquid against a first-order phase transition is calculated at zero temperature. During fluctuations of a droplet of the stable phase, in accordance with…Kei Iida·Dec 16, 1998SaveLearn
First and second order transitions in dilute O(n) modelsWe explore the phase diagram of an O(n) model on the honeycomb lattice with vacancies, using finite-size scaling and transfer-matrix methods. We make use of the loop representation of the O(n) model,…Wenan Guo, Henk W. J. Bloete, Bernard Nienhuis·Dec 16, 1998SaveLearn
Phase Diagram of a Loop on the Square LatticeThe phase diagram of the O(n) model, in particular the special case n=0, is studied by means of transfer-matrix calculations on the loop representation of the O(n) model. The model is defined on…Wenan Guo, Henk W. J. Bloete, Bernard Nienhuis·Dec 16, 1998SaveLearn
On Superconductors and Torsion VorticesThe Meissner effect for superconductors in spacetimes with torsion is revisited.Two new physical interpretaions are presented.The first considers the Landau-Ginzburg theory yields a new…L. C. Garcia de Andrade·Dec 16, 1998SaveLearn
Statistics of photodissociation spectra: nonuniversal propertiesWe consider the two-point correlation function of the photodissociation cross section in molecules where the fragmentation process is indirect, passing through resonances above the dissociation…Oded Agam·Dec 15, 1998SaveLearn
An Atom Laser with a cw Output CouplerWe demonstrate a continuous output coupler for magnetically trapped atoms. Over a period of up to 100 ms a collimated and monoenergetic beam of atoms is continuously extracted from a Bose- Einstein…Immanuel Bloch, Theodor W. Haensch, Tilman Esslinger·Dec 15, 1998SaveLearn
U(1)XSU(2) Gauge theory of underdoped high Tc cuprates via Chern-Simons bosonizationWe outline the basic ideas involved in a recently proposed derivation of a gauge theory for underdoped cuprates in the "spin-gap phase", performed essentially step by step starting from the…P. A. Marchetti·Dec 15, 1998SaveLearn
The peculiarities of phase transitions in layered ferroelectrics-semiconductors TlIn1-xFexS2The results of differential-thermal analysis of various samples as well as dielectric measurements of solid solutions TlIn1-xFex56,57S2 are presented. It has been established that phase…R. M. Sardarli, A. P. Abdullayev, O. A. Samedov et al.·Dec 15, 1998SaveLearn
Theory and Data Analysis for the High Momentum End of 4He spectrumThe hybridization of the single-excitation branch with the two-excitation continuum is reconsidered from the theoretical point of view by including the effect of the interference term between one and…F. Pistolesi·Dec 15, 1998SaveLearn
Mean-field theory of temperature cycling experiments in spin-glassesWe study analytically the effect of temperature cyclings in mean-field spin-glasses. In accordance with real experiments, we obtain a strong reinitialization of the dynamics on decreasing the…Leticia F. Cugliandolo, Jorge Kurchan·Dec 14, 1998SaveLearn
Continuous phase transition in a spin-glass model without time-reversal symmetryWe investigate the phase transition in a strongly disordered short-range three-spin interaction model characterized by the absence of time reversal symmetry in the Hamiltonian. In the mean-field…G. Parisi, M. Picco, F. Ritort·Dec 14, 1998SaveLearn
Optical excitations in a non-ideal Bose gasOptical excitations in a Bose gas are demonstrated to be very sensitive to many-body effects. At low temperature the momentum relaxation is provided by momentum exchange collisions, rather than by…M. O. Oktel, L. S. Levitov·Dec 14, 1998SaveLearn
Recent results on multiplicative noiseRecent developments in the analysis of Langevin equations with multiplicative noise (MN) are reported. In particular, we: (i) present numerical simulations in three dimensions showing that the MN…W. Genovese, Miguel A. Munoz·Dec 11, 1998SaveLearn
Weak force detection using a double Bose-Einstein condensateA Bose-Einstein condensate may be used to make precise measurements of weak forces, utilizing the macroscopic occupation of a single quantum state. We present a scheme which uses a condensate in a…J. F. Corney, G. J. Milburn, Weiping Zhang·Dec 11, 1998SaveLearn
Band-Structure Effects in the Spin Relaxation of Conduction ElectronsSpin relaxation of conduction electrons in metals is significantly influenced by the Fermi surface topology. Electrons near Brillouin zone boundaries, special symmetry points, or accidental…J. Fabian, S. Das Sarma·Dec 11, 1998SaveLearn
Crystal stability and optical properties of organic chain compoundsThe solution to the long standing problem of the cohesion of organic chain compounds is proposed. We consider the tight-binding dielectric matrix with two electronic bands per chain, determine the…P. Zupanovic, A. Bjelis, S. Barisic·Dec 11, 1998SaveLearn
A first principle computation of the thermodynamics of glassesWe propose a first principle computation of the equilibrium thermodynamics of simple fragile glasses starting from the two body interatomic potential. A replica formulation translates this problem…Marc Mezard, Giorgio Parisi·Dec 10, 1998SaveLearn
Mesoscopic phenomena in Bose-Einstein systems: Persistent currents, population oscillations and quantal phasesMesoscopic phenomena - including population oscillations and persistent currents driven by quantal phases - are explored theoretically in the context of multiply-connected Bose-Einstein systems…Yuli Lyanda-Geller, Paul M. Goldbart·Dec 9, 1998SaveLearn
The structure of large 3He-4He mixed drops around a dopant moleculeWe have investigated how helium atoms are distributed within a mixed 3HeN3-4HeN4 large drop with N3 N4. For drops doped with a SF6 molecule or a Xe atom, we have found…Marti Pi, Ricardo Mayol, Manuel Barranco·Dec 9, 1998SaveLearn