Reconstructing Generalized Exponential Laws by Self-Similar Exponential ApproximantsWe apply the technique of self-similar exponential approximants based on successive truncations of continued exponentials to reconstruct functional laws of the quasi-exponential class from the…S. Gluzman, D. Sornette, V. I. Yukalov·Apr 15, 2002SaveLearn
Quantum phases of dipolar bosons in optical latticesThe ground state of dipolar bosons placed in an optical lattice is analyzed. We show that the modification of experimentally accessible parameters can lead to the realization and control of different…K. Goral, L. Santos, M. Lewenstein·Apr 15, 2002SaveLearn
Bose Condensation and Lasing in Optical Microstructures - Part 2The second part of this thesis is concerned with properties of excitons and modelling of excitonic lasing in quasi-one-dimensional quantum wires. I develop a very general numerical method of…M H Szymanska·Apr 14, 2002SaveLearn
Bose Condensation and Lasing in Optical Microstructures - Part 1In the first part of this thesis I study the intermediate regime between ordinary lasing and a BEC of exciton polaritons. I take into account the fermionic structure of polaritons, treating the…M H Szymanska·Apr 13, 2002SaveLearn
The crossover between lasing and polariton condensation in optical microcavitiesWe study a model of a photon mode dipole-coupled to a medium of two-level oscillators in a microcavity in the presence of dephasing processes introduced by coupling to external baths. Decoherence…M. H. Szymanska, P. B. Littlewood·Apr 12, 2002SaveLearn
Atomic Scale Memory at a Silicon SurfaceThe limits of pushing storage density to the atomic scale are explored with a memory that stores a bit by the presence or absence of one silicon atom. These atoms are positioned at lattice sites…R. Bennewitz, J. N. Crain, A. Kirakosian et al.·Apr 11, 2002SaveLearn
Theory of amplification of sound (acoustic phonons) by absorption of laser radiation in quantum wires with parabolic potentialBased on the quantum transport equation for the electron-phonon system, the absorption coefficient of sound (acoustic phonons) by absorption of a laser radiation in quantum wires with parabolic…Nguyen Quoc Hung, Dinh Quoc Vuong, Nguyen Quang Bau·Apr 11, 2002SaveLearn
Saturated Ferromagnetism and Magnetization Deficit in Optimally Annealed (Ga,Mn)As EpilayersWe examine the Mn concentration dependence of the electronic and magnetic properties of optimally annealed Ga1-xMnxAs epilayers for 1.35% < x < 8.3%. The Curie temperature (Tc), conductivity, and…S. J. Potashnik, K. C. Ku, R. Mahendiran et al.·Apr 11, 2002SaveLearn
Nonlinear behavior in the Thermopower of Doped Carbon Nanotubes Due to Strong, Localized StatesThe temperature dependent thermoelectric power (TEP) of boron and nitrogen doped multi-walled carbon nanotube mats has been measured showing that such dopants can be used to modify the majority…Y. -M Choi, D. -S. Lee, R. Czerw et al.·Apr 11, 2002SaveLearn
Two different quasiparticle scattering rates in vortex line liquid phase of layered d-wave superconductorsWe carry out a quantum mechanical analysis of the behavior of nodal quasiparticles in the vortex line liquid phase of planar d-wave superconductors. Applying a novel path integral technique we…D. V. Khveshchenko, A. G. Yashenkin·Apr 10, 2002SaveLearn
Classical-Field Theory of Electron Waves as a Polarized Radiation Probe of Magnetic SurfacesRecently, there has been a revival of interest in mechanisms for changing the spin polarization of an electron beam on transmission through, or reflection from, a magnetic surface. An understanding…D. C. Hatton, J. A. C. Bland·Apr 10, 2002SaveLearn
Invariant Imbedding Equations for Electromagnetic Waves in Stratified Magnetic Media: Applications to One-Dimensional Photonic CrystalsWe derive the invariant imbedding equations for plane electromagnetic waves propagating in stratified magnetic media, where both dielectric and magnetic permeabilities vary in one spatial direction…Kihong Kim, H. Lim, Dong-Hun Lee·Apr 10, 2002SaveLearn
Two types of electronic states in one dimensional crystals of finite lengthExact and general results on the electronic states in one dimensional crystals bounded at tau and tau+L - where L=Na, N is a positive integer and a is the potential period - are presented.…Shang Yuan Ren·Apr 9, 2002SaveLearn
Some recent (and surprising) results on interface and contact line depinning in random mediaI give a brief review of results obtained recently at Ecole Normale on the depinning transition of interfaces and contact lines using a variety of approaches: non-local Monte Carlo algorithms,…Jean Vannimenus·Apr 9, 2002SaveLearn
Stretched exponential dynamics in a chain of coupled chaotic oscillatorsWe measure stretched exponential behavior, exp(- (t/t0)**beta), over many decades in a one-dimensional array of coupled chaotic electronic elements just above a crisis-induced intermittency…E. R. Hunt, P. M. Gade, Normand Mousseau·Apr 8, 2002SaveLearn
Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundlesWe present a study on the kinetics of xenon desorption from single-wall carbon nanotube (SWNT) bundles using thermal desorption spectroscopy (TDS). TD-spectra from SWNT samples show a broad…Hendrik Ulbricht, Jennah Kriebel, Gunnar Moos et al.·Apr 8, 2002SaveLearn
A Marginal Dimension of a Weakly Diluted Quenched m-Vector ModelWe calculate a marginal order parameter dimension mc which in a weakly diluted quenched m-vector model controls the crossover from a universality class of a ``pure'' model (m>mc) to a…Yu. Holovatch, M. Dudka, T. Yavors'kii·Apr 5, 2002SaveLearn
Complex Flow of Granular Material in a Rotating CylinderThe flow of granular material in a rotating cylinder was simulated by molecular dynamics in two dimensions using spherical as well as nonspherical grains. At very low but constant angular velocity we…Thorsten Poeschel, Volkhard Buchholtz·Apr 5, 2002SaveLearn
Nonlinear waves in a cylindrical Bose-Einstein condensateWe present a complete calculation of solitary waves propagating in a steady state with constant velocity v along a cigar-shaped Bose-Einstein trap approximated as infinitely-long cylindrical. For…S. Komineas, N. Papanicolaou·Apr 5, 2002SaveLearn
Particle number fractionization of an atomic Fermi-Dirac gas in an optical latticeWe show that a dilute 2-species gas of Fermi-Dirac alkali-metal atoms in a periodic optical lattice may exhibit fractionization of particle number when the two components are coupled via a coherent…Janne Ruostekoski, Gerald V. Dunne, Juha Javanainen·Apr 5, 2002SaveLearn
Ultrafast Dynamics of Interfacial Electric Fields in Semiconductor Heterostructures Monitored by Pump-Probe Second Harmonic GenerationWe report first measurements of the ultrafast dynamics of interfacial electric fields in semiconductor multilayers using pump-probe second harmonic generation (SHG). A pump beam was tuned to excite…Yu. D. Glinka, T. V. Shahbazyan, I. E. Perakis et al.·Apr 4, 2002SaveLearn
Variational approach to the Coulomb problem on a cylinderWe evaluate, by means of variational calculations, the bound state energy EB of a pair of charges located on the surface of a cylinder, interacting via Coulomb potential - e2 / r . The trial wave…M. K. Kostov, M. W. Cole, G. D. Mahan·Apr 4, 2002SaveLearn
Josephson spectroscopy of a dilute Bose-Einstein condensate in a double-well potentialThe dynamics of a Bose-Einstein condensate in a double-well potential are analysed in terms of transitions between energy eigenstates. By solving the time-dependent and time-independent…E. Sakellari, M. Leadbeater, N. J. Kylstra et al.·Apr 3, 2002SaveLearn
Surface Properties of the Half- and Full-Heusler AlloysUsing a full-potential ab-initio technique I study the electronic and magnetic properties of the (001) surfaces of the half-Heusler alloys, NiMnSb, CoMnSb and PtMnSb and of the full-Heusler…I. Galanakis·Apr 3, 2002SaveLearn
Evolution of percolating force chains in compressed granular mediaThe evolution of effective force chains percolating through a compressed granular system is investigated. We performed experiments by compressing an ensemble of spherical particles in a cylindrical…Raul Cruz Hidalgo, Christian U. Grosse, Ferenc Kun et al.·Apr 3, 2002SaveLearn