Casimir energy of dielectric systemsA new formula for the Casimir energy of a dispersive dilute dielectric ball is discussed. The formula for the Casimir energy of a polarizable particle situated in a perfectly conducting wedge-shaped…Valery N. Marachevsky·Feb 4, 2002SaveLearn
Stern-Gerlach Entanglement in Spinor Bose-Einstein CondensatesEntanglement of spin and position variables produced by spatially inhomogeneous magnetic fields of Stern-Gerlach type acting on spinor Bose-Einstein condensates may lead to interference effects at…S. Cruz-Barrios, M. C. Nemes, A. F. R. de Toledo Piza·Feb 4, 2002SaveLearn
Metal-Insulator Transition and Ferromagnetism in Diluted Magnetic SemiconductorsWe have investigated the interplay between the metal-insulator transition and ferromagnetism in ( III1-x, Mnx) V ferromagnetic semiconductors. Our study is based on a model in…S. -R. Eric Yang, A. H. MacDonald·Feb 1, 2002SaveLearn
The stochastic Gross-Pitaevskii equationWe show how to adapt the ideas of local energy and momentum conservation in order to derive modifications to the Gross-Pitaevskii equation which can be used phenomenologically to describe…C. W. Gardiner J. R. Anglin, T. I. A. Fudge·Feb 1, 2002SaveLearn
Directional `superradiant' collisions: bosonic amplification of atom pairs emitted from an elongated Bose-Einstein condensateWe study spontaneous directionality in the bosonic amplification of atom pairs emitted from an elongated Bose-Einstein condensate (BEC), an effect analogous to `superradiant' emission of…A. Vardi, M. G. Moore·Jan 31, 2002SaveLearn
Simulations of thermal Bose fields in the classical limitWe demonstrate that the time-dependent projected Gross-Pitaevskii equation derived earlier [Davis, et al., J. Phys. B 34, 4487 (2001)] can represent the highly occupied modes of a homogeneous,…M. J. Davis, S. A. Morgan, K. Burnett·Jan 31, 2002SaveLearn
Mechanistic approach to generalized technical analysis of share prices and stock market indicesClassical technical analysis methods of stock evolution are recalled, i.e. the notion of moving averages and momentum indicators. The moving averages lead to define death and gold crosses, resistance…M. Ausloos, K. Ivanova·Jan 31, 2002SaveLearn
Single Ion Implantation for Solid State Quantum Computer DevelopmentSeveral solid state quantum computer schemes are based on the manipulation of electron and nuclear spins of single donor atoms in a solid matrix. The fabrication of qubit arrays requires the…T. Schenkel, J. P. Holder, J. W. McDonald et al.·Jan 30, 2002SaveLearn
Parametric spectral correlations in disordered and chaotic structuresWe explore the influence of external perturbations on the energy levels of a Hamiltonian drawn at random from the Gaussian unitary distribution of Hermitian matrices. By deriving the joint…I. E. Smolyarenko, F. M. Marchetti, B. D. Simons·Jan 29, 2002SaveLearn
Microwave properties of Nd0.5Sr0.5MnO3: a key role of the (x2-y2)-orbital effectsTransmittance of the colossal magnetoresistive compound Nd0.5Sr0.5MnO3 showing metal-insulator phase transition has been studied by means of the submm- and mm-wavelength band spectroscopy. An…S. Zvyagin, A. Angerhofer, K. V. Kamenev et al.·Jan 29, 2002SaveLearn
Spin-drift transport and its applicationsWe study the generation of non-equilibrium spin currents in systems with spatially-inhomogeneous magnetic potentials. For sufficiently high current densities, the spin polarization can be transported…Ivar Martin·Jan 25, 2002SaveLearn
Bose-Einstein Condensation at a Helium SurfacePath Integral Monte Carlo was used to calculate the Bose-Einstein condensate fraction at the surface of a helium film at T=0.77 K, as a function of density. Moving from the center of the slab to…E. W. Draeger, D. M. Ceperley·Jan 25, 2002SaveLearn
Optimization and Parallelization of a force field for silicon using OpenMPThe force field by Lenosky and coworkers is the latest force field for silicon which is one of the most studied materials. It has turned out to be highly accurate in a large range of test cases. The…Stefan Goedecker·Jan 25, 2002SaveLearn
Scroll waves in isotropic excitable media : linear instabilities, bifurcations and restabilized statesScroll waves are three-dimensional analogs of spiral waves. The linear stability spectrum of untwisted and twisted scroll waves is computed for a two-variable reaction-diffusion model of an excitable…Herve Henry, Vincent Hakim·Jan 25, 2002SaveLearn
Hartree-Fock Model of a Self-Avoiding Flexible PolymerRecent measurements of the force versus extension curves in stretched single stranded DNA, under conditions where the hydrogen bonding between complementary bases is inhibited, provide a new handle…C. Bouchiat·Jan 24, 2002SaveLearn
The network topology of a potential energy landscape: A static scale-free networkHere we analyze the topology of the network formed by the minima and transition states on the potential energy landscape of small clusters. We find that this network has both a small-world and…Jonathan P. K. Doye·Jan 23, 2002SaveLearn
Towards quantum well hot hole lasersIt should be possible to improve hot-hole laser performance by moving from bulk materials to a quantum well structure. The extra design parameters enable us to alter the band structure by changing…P. Kinsler, W. Th. Wenckebach·Jan 22, 2002SaveLearn
Macroscopic dynamics of a trapped Bose-Einstein condensate in the presence of 1D and 2D optical latticesThe hydrodynamic equations of superfluids for a weakly interacting Bose gas are generalized to include the effects of periodic optical potentials produced by stationary laser beams. The new equations…M. Kraemer, L. Pitaevskii, S. Stringari·Jan 22, 2002SaveLearn
Rigidity transitions and constraint counting in amorphous networks: beyond the mean-field approachSubj-class: Disordered Systems and Neural NetworksMatthieu Micoulaut·Jan 21, 2002SaveLearn
Critical Effects in Population Dynamics of Trapped Bose-Einstein CondensatesThe population dynamics of a trapped Bose-Einstein condensate, subject to the action of an external field, is studied. This field produces a spatio-temporal modulation of the trapping potential with…V. I. Yukalov, E. P. Yukalova, V. S. Bagnato·Jan 20, 2002SaveLearn
A New General Theory of SuperconductivityA general theory of superconductivity based on the pairing of electrons that belong to different electronic bands is presented. These electronic bands arise because of a symmetry breaking at the…R. Riera, J. L. Marin, R. Betancourt-Riera·Jan 18, 2002SaveLearn
Dimension dependence of the conductance distribution in the non-metallic regimesWe study numerically the form of the conductance distribution in the non-metallic regime for (1) weakly disordered systems which become insulating due to increase of the system length and (2) cubic…Peter Markos·Jan 18, 2002SaveLearn
Universal Equation for Efimov StatesEfimov states are a sequence of shallow 3-body bound states that arise when the 2-body scattering length is large. Efimov showed that the binding energies of these states can be calculated in terms…Eric Braaten, H. -W. Hammer, M. Kusunoki·Jan 16, 2002SaveLearn
Aubry transition studied by direct evaluation of the modulation functions of infinite incommensurate systemsIncommensurate structures can be described by the Frenkel Kontorova model. Aubry has shown that, at a critical value Kc of the coupling of the harmonic chain to an incommensurate periodic potential,…Titus S. van Erp, Annalisa Fasolino·Jan 16, 2002SaveLearn
A non extensive approach for DNA breaking by ionizing radiationTsallis entropy and a maximum entropy principle allows to reproduce experimental data of DNA double strand breaking by electron and neutron radiation. Analytic results for the probability of finding…O. Sotolongo-Costa, F. Guzman, J. C. Antoranz et al.·Jan 16, 2002SaveLearn