Characterization of elastic scattering near a Feshbach resonance in rubidium 87The s-wave scattering length for elastic collisions between 87Rb atoms in the state |f,mf>=|1,1> is measured in the vicinity of a Feshbach resonance near 1007 G. Experimentally, the scattering…Thomas Volz, Stephan Dürr, Sebastian Ernst et al.·Jun 13, 2003SaveLearn
Split-merge cycle, fragmented collapse, and vortex disintegration in rotating Bose-Einstein condensates with attractive interactionsThe dynamical instabilities and ensuing dynamics of singly- and doubly-quantized vortex states of Bose-Einstein condensates with attractive interactions are investigated using full 3D numerical…Hiroki Saito, Masahito Ueda·Jun 12, 2003SaveLearn
Electromechanical coupling in free-standing AlGaN/GaN planar structuresThe strain and electric fields present in free-standing AlGaN/GaN slabs are examined theoretically within the framework of fully-coupled continuum elastic and dielectric models. Simultaneous…B. Jogai, J. D. Albrecht, E. Pan·Jun 12, 2003SaveLearn
The effect of electromechanical coupling on the strain in AlGaN/GaN heterojunction field effect transistorsThe strain in AlGaN/GaN heterojunction field-effect transistors (HFETs) is examined theoretically in the context of the fully-coupled equation of state for piezoelectric materials. Using a simple…B. Jogai, J. D. Albrecht, E. Pan·Jun 11, 2003SaveLearn
Random Spin Signal in Magnetic Resonance Force MicroscopyWe study a random magnetic resonance force microscopy (MRFM) signal caused by the thermal vibrations of high frequency cantilever modes in the oscillating cantilever-driven adiabatic reversals…G. P. Berman, V. N. Gorshkov, V. I. Tsifrinovich·Jun 11, 2003SaveLearn
Semiclassical theory of matter-wave detectionWe derive a semiclassical theory for the detection of matter-waves. This theory draws on the theories of semiclassical optical detection and fluid mechanics. We observe that the intrinsically…Nicholas K. Whitlock, Stephen M. Barnett, John Jeffers·Jun 11, 2003SaveLearn
Mean-field analysis of the stability of a K-Rb Fermi-Bose mixtureWe compare the experimental stability diagram of a Fermi-Bose mixture of K-40 and Rb-87 atoms with attractive interaction to the predictions of a mean-field theoretical model. We discuss how this…M. Modugno, F. Ferlaino, F. Riboli et al.·Jun 11, 2003SaveLearn
Electron transfer rates for asymmetric reactionsWe use a numerically exact real-time path integral Monte Carlo scheme to compute electron transfer dynamics between two redox sites within a spin-boson approach. The case of asymmetric reactions is…L. Muehlbacher, R. Egger·Jun 11, 2003SaveLearn
Exact asymptotic form of the exchange interactions between shallow centers in doped semiconductorsThe method developed in [L. P. Gor'kov and L. P. Pitaevskii, Sov. Phys. Dokl. 8, 788 (1964); C. Herring and M. Flicker, Phys. Rev. 134, A362 (1964)] to calculate the asymptotic form of exchange…L. P. Gor'kov, P. L. Krotkov·Jun 10, 2003SaveLearn
Charge-based quantum computing using single donors in semiconductorsSolid-state quantum computer architectures with qubits encoded using single atoms are now feasible given recent advances in atomic doping of semiconductors. Here we present a charge qubit consisting…L. C. L. Hollenberg, A. S. Dzurak, C. Wellard et al.·Jun 10, 2003SaveLearn
Improved self-absorption correction for fluorescence measurements of extended x-ray absorption fine-structureExtended x-ray absorption fine-structure (EXAFS) data collected in the fluorescence mode are susceptible to an apparent amplitude reduction due to the self-absorption of the fluorescing photon by the…C. H. Booth, F. Bridges·Jun 10, 2003SaveLearn
Identifying structural patterns in `disordered' metal clustersZinc and cadmium clusters interacting with a Gupta potential have previously been identified as prototypical metallic systems that exhibiting disordered cluster structures. Here, putative global…Jonathan P. K. Doye·Jun 9, 2003SaveLearn
Update statistics in conservative parallel discrete event simulations of asynchronous systemsWe model the performance of an ideal closed chain of L processing elements that work in parallel in an asynchronous manner. Their state updates follow a generic conservative algorithm. The…A. Kolakowska, M. A. Novotny, Per Arne Rikvold·Jun 9, 2003SaveLearn
Transverse Fresnel-Fizeau drag effects in strongly dispersive mediaA light beam normally incident upon an uniformly moving dielectric medium is in general subject to bendings due to a transverse Fresnel-Fizeau light drag effect. In conventional dielectrics, the…Iacopo Carusotto, Maurizio Artoni, Giuseppe La Rocca et al.·Jun 9, 2003SaveLearn
Field-induced charge transport at the surface of pentacene single crystals: a method to study charge dynamics of 2D electron systems in organic crystalsA method has been developed to inject mobile charges at the surface of organic molecular crystals, and the DC transport of field-induced holes has been measured at the surface of pentacene single…J. Takeya, C. Goldmann, S. Haas et al.·Jun 9, 2003SaveLearn
Microscopic Wave Functions of Spin Singlet and Nematic Mott States of Spin-One Bosons in High Dimensional Bipartite LatticesWe present microscopic wave functions of spin singlet Mott insulating states and nematic Mott insulating states. We also investigate quantum phase transitions between the spin singlet Mott phase and…Michiel Snoek, Fei Zhou·Jun 7, 2003SaveLearn
A Kelvin-wave cascade on a vortex in superfluid 4He at a very low temperatureA study by computer simulation is reported of the behaviour of a quantized vortex line at a very low temperature when there is continuous excitation of low-frequency Kelvin waves. There is no…W. F. Vinen, Makoto Tsubota, Akira Mitani·Jun 7, 2003SaveLearn
Time correlations in a confined magnetized free-electron gasThe time-dependent pair correlation functions for a degenerate ideal quantum gas of charged particles in a uniform magnetic field are studied on the basis of equilibrium statistics. In particular,…L. G. Suttorp·Jun 6, 2003SaveLearn
Variational ansatz for the superfluid Mott-insulator transition in optical latticesWe develop a variational wave function for the ground state of a one-dimensional bosonic lattice gas. The variational theory is initally developed for the quantum rotor model and later on extended to…J. J. Garcia-Ripoll, J. I. Cirac, P. Zoller et al.·Jun 6, 2003SaveLearn
Atom trapping and two-dimensional Bose-Einstein condensates in field-induced adiabatic potentialsWe discuss a method to create two-dimensional traps as well as atomic shell, or bubble, states for a Bose-Einstein condensate initially prepared in a conventional magnetic trap. The scheme relies on…O. Zobay, B. M. Garraway·Jun 6, 2003SaveLearn
Intrinsic self-rotation of BEC Bloch wave packetsThe semiclassical theory of Bloch wave packet dynamics predicts a self-rotation angular momentum in asymmetric periodic potentials, which has never been observed. We show how this is manifested in…Roberto B. Diener, Artem M. Dudarev, Ganesh Sundaram et al.·Jun 6, 2003SaveLearn
Non-linear electrical response in a charge/orbital ordered 0.63Ca0.37MnO3 crystal : the charge density wave analogyNon-linear conduction in a charge-ordered manganese oxide Pr0.63Ca0.37MnO3 is reported. To interpret such a feature, it is usually proposed that a breakdown of the charge or orbitally…A. Wahl, S. Mercone, A. Pautrat et al.·Jun 6, 2003SaveLearn
Structural evidence against current-induced destruction of charge-ordering in manganese oxidesHigh-resolution x-ray scattering, in the presence of an applied current, has been used for studying the stability of the charge ordered phase of manganese oxides upon current biasing. We find that…A. Wahl, V. Caignaert, S. Mercone et al.·Jun 6, 2003SaveLearn
Diagnosis and Location of Pinhole Defects in Tunnel Junctions using only Electrical MeasurementsIn the development of the first generation of sensors and memory chips based on spin-dependent tunneling through a thin trilayer, it has become clear that pinhole defects can have a deleterious…Zhongsheng Zhang, David A. Rabson·Jun 6, 2003SaveLearn
Spin-galvanic effect due to optical spin orientationUnder oblique incidence of circularly polarized infrared radiation the spin-galvanic effect has been unambiguously observed in (001)-grown n-type GaAs quantum well (QW) structures in the absence of…S. D. Ganichev, Petra Schneider, V. V. Bel'kov et al.·Jun 6, 2003SaveLearn