Barrier resonances in Bose-Einstein condensationWe study the dynamics of the mean field model of a Bose-Einstein condensed atom cloud in a parametrically forced trap by using analytical and numerical techniques. The dynamics is related to a…J. J. Garcia-Ripoll, V. M. Perez-Garcia·Nov 18, 1998SaveLearn
Density-functional theory calculations of hopping rates of surface diffusionUsing density-functional theory we compute the energy barriers and attempt frequencies for surface diffusion of Ag on Ag(111) with different lattice constants, and on an Ag adsorbate monolayer on…C. Ratsch, M. Scheffler·Nov 17, 1998SaveLearn
Highly site-specific H2 adsorption on vicinal Si(001) surfacesExperimental and theoretical results for the dissociative adsorption of H2 on vicinal Si(001) surfaces are presented. Using optical second-harmonic generation, sticking probabilities at the step…P. Kratzer, E. Pehlke, M. Scheffler et al.·Nov 17, 1998SaveLearn
Corrections to the RPA Dielectric Function Induced by Fluctuations in the Momentum DistributionIn this article, we introduce a new dielectric function that is different even from the generalised RPA, first introduced in cond-mat/9810043, in that it pays attention to fluctuations in the…Girish S. Setlur, Yia-Chung Chang·Nov 17, 1998SaveLearn
Selftrapping and Quantum Fluctuations in the Discrete Nonlinear Schrodinger EquationWe study the robustness of the selftrapping phenomenon exhibited by the Discrete Nonlinear Schrodinger (DNLS) equation against the effects of nonadiabaticity and quantum fluctuations in a two-site…C. A. Bustamante, M. I. Molina·Nov 17, 1998SaveLearn
Dynamical Anomalies and Intermittency in Burgers TurbulenceWe analyze the field theory of fully developed Burgers turbulence. Its key elements are shock fields, which characterize the singularity statistics of the velocity field. The shock fields enter an…M. Lassig·Nov 16, 1998SaveLearn
The Elasticity of an Electron LiquidThe zero temperature response of an interacting electron liquid to a time-dependent vector potential of wave vector q and frequency w such that q << qF, qvF<< w << EF/hbar (where qF, vF and EF…S. Conti, G. Vignale·Nov 16, 1998SaveLearn
Crowd effects and volatility in a competitive marketWe present analytic and numerical results for two models, namely the minority model and the bar-attendance model, which offer simple paradigms for a competitive marketplace. Both models feature…Neil F. Johnson, Michael Hart, Pak Ming Hui·Nov 16, 1998SaveLearn
Optimizing Smith-Waterman alignmentsMutual correlation between segments of DNA or protein sequences can be detected by Smith-Waterman local alignments. We present a statistical analysis of alignment of such sequences, based on a recent…Rolf Olsen, Terence Hwa, Michael Lassig·Nov 16, 1998SaveLearn
Spatio-selection in Expanding Bacterial ColoniesSegregation of populations is a key question in evolution theory. One important aspect is the relation between spatial organization and the population's composition. Here we study a specific…Ido Golding, Inon Cohen, Eshel Ben-Jacob·Nov 15, 1998SaveLearn
Magnetic irreversibility and relaxation in assembly of ferromagnetic nanoparticlesMeasurements of the magnetic irreversibility line and time-logarithmic decay of the magnetization are described for three Fe2O3 samples composed of regular amorphous, acicular amorphous and…R. Prozorov, Y. Yeshurun, T. Prozorov et al.·Nov 14, 1998SaveLearn
Critical Properties in Photoemmision Spectra for One Dimensional Orbitally Degenerate Mott InsulatorCritical properties in photoemission spectra for the one-dimensional Mott insulator with orbital degeneracy are studied by exploiting the integrable t-J model, which is a supersymmetric…T. Fujii, Y. Tsukamoto, N. Kawakami·Nov 13, 1998SaveLearn
Reply to a Comment on "Quantum Decoherence in Disordered Mesoscopic Systems" (cond-mat/9808078, cond-mat/9808053)We reply to the critique of our results raised by Aleiner, Altshuler and Gershenzon (AAG) in cond-mat/9808078 and cond-mat/9808053. We demonstrate that our path integral analysis fully reproduces the…Dmitrii S. Golubev, Andrei D. Zaikin·Nov 13, 1998SaveLearn
Quantum Theory of Atomic Four-Wave Mixing in Bose-Einstein CondensatesWe present an exact quantum mechanical analysis of collinear four-wave mixing in a multicomponent Bose-Einstein condensate consisting of sodium atoms in the F=1 ground state. Technically, this is…Elena V. Goldstein, Pierre Meystre·Nov 12, 1998SaveLearn
Strong coupling resistivity in the Kondo modelBy applying methods of integrable quantum field theory to the Kondo problem, we develop a systematic perturbation expansion near the IR (strong coupling) fixed point. This requires the knowledge of…F. Lesage, H. Saleur·Nov 12, 1998SaveLearn
Observation of metastable states in spinor Bose-Einstein condensatesBose-Einstein condensates have been prepared in long-lived metastable excited states. Two complementary types of metastable states were observed. The first is due to the immiscibility of multiple…H. -J. Miesner, D. M. Stamper-Kurn, J. Stenger et al.·Nov 11, 1998SaveLearn
Instabilities of wave function monopoles in Bose-Einstein condensatesWe present analytic and numerical results for a class of monopole solutions to the two-component Gross-Pitaevski equation for a two-species Bose condensate in an effectively two-dimensional trap. We…Th. Busch, J. R. Anglin·Nov 11, 1998SaveLearn
Imaging Microwave Electric Fields Using a Near-Field Scanning Microwave MicroscopeBy scanning a fine open-ended coaxial probe above an operating microwave device, we image local electric fields generated by the device at microwave frequencies. The probe is sensitive to the…S. K. Dutta, C. P. Vlahacos, D. E. Steinhauer et al.·Nov 10, 1998SaveLearn
Field Theory of the Random Flux ModelThe long-range properties of the random flux model (lattice fermions hopping under the influence of maximally random link disorder) are shown to be described by a supersymmetric field theory of…Alexander Altland, B D Simons·Nov 10, 1998SaveLearn
Self-consistent effects of continuous wave output coupling of atoms from a Bose-Einstein condensateWe present a self-consistent mean field model of the extraction of atoms from a Bose-Einstein condensate to form a CW atom laser. The model is based upon the Hartree-Fock Bogoliubov equations within…D. A. W. Hutchinson·Nov 10, 1998SaveLearn
Fast and slow dynamics of hydrogen bonds in liquid waterWe study hydrogen-bond dynamics in liquid water at low temperatures using molecular dynamics simulations. We find that bond lifetime (``fast dynamics'') has Arrhenius temperature dependence.…Francis W. Starr, Johannes K. Nielsen, H. Eugene Stanley·Nov 9, 1998SaveLearn
Structural evidence for the continuity of liquid and glassy waterAn open question is whether the liquid and glassy phases of water are thermodynamically distinct or continuous. Here we address this question using molecular dynamics simulations in comparison with…Francis W. Starr, Marie-Claire Bellissent-Funel, H. Eugene Stanley·Nov 9, 1998SaveLearn
Exact Thermodynamics of Disordered Impurities in Quantum Spin ChainsExact results for the thermodynamic properties of ensembles of magnetic impurities with randomly distributed host-impurity couplings in the quantum antiferromagnetic Heisenberg model are presented.…A. Klümper, A. A. Zvyagin·Nov 9, 1998SaveLearn
Application of Renormalization Group Techniques to a Homogeneous Bose Gas at Finite TemperatureA homogeneous Bose gas is investigated at finite temperature using renormalization group techniques. A non--perturbative flow equation for the effective potential is derived using sharp and smooth…Jens O. Andersen, Michael Strickland·Nov 6, 1998SaveLearn
Quasicondensation in 2D Interacting Bose Gas: Quantum Monte Carlo StudyWe present a detailed Monte Carlo study of correlations in an interacting two-dimensional Bose gas. The data for one-particle density matrix in coordinate representation are compared to the results…Yu. Kagan, V. A. Kashurnikov, A. V. Krasavin et al.·Nov 6, 1998SaveLearn