Theoretical study of photon emission from molecular wiresWe explore theoretically the principles that govern photon emission from single-molecule conductors carrying electric currents between metallic contacts. The molecule and contacts are represented by…John Buker, George Kirczenow·Nov 18, 2002SaveLearn
Anisotropic Bose-Einstein condensates and completely integrable dynamical systemsA Gaussian ansatz for the wave function of two-dimensional harmonically trapped anisotropic Bose-Einstein condensates is shown to lead, via a variational procedure, to a coupled system of two…F. Haas·Nov 17, 2002SaveLearn
Exact-exchange density-functional theory for quasi-two-dimensional electron gasesA simple exact-exchange density-functional method for a quasi-two-dimensional electron gas with variable density is presented. An analytical expression for the exact-exchange potential with only one…F. A. Reboredo, C. R. Proetto·Nov 16, 2002SaveLearn
Anisotropic dissipation of superfluid flow in a periodically-dressed Bose-Einstein condensateThe introduction of a steady-state spatially-periodic Raman coupling between two components of an ultracold atomic gas produces a dressed-state gas with an anisotropic and tunable dispersion…Dan M. Stamper-Kurn·Nov 16, 2002SaveLearn
Giant Clusters in Random Ad Hoc NetworksThe present paper introduces ad hoc communication networks as examples of large scale real networks that can be prospected by statistical means. A description of giant cluster formation based on the…G. Nemeth, G. Vattay·Nov 15, 2002SaveLearn
Stark effect upon the effective mass and radius in a tight-binding exciton modelWith a Green's function formalism we obtain the eigenvalue spectrum of a tight-binding one-dimensional exciton model characterized by a contact interaction, a Coulombic electron and hole…Jean El-khoury, Jean-Pierre Gallinar·Nov 15, 2002SaveLearn
Self-Similar Approximations for a Trapped Bose-Einstein CondensateAn approximate solution to the Gross-Pitaevskii equation for Bose-Einstein condensate in a spherical harmonic trap is suggested, which is valid in the whole interval of the coupling parameter,…V. I. Yukalov, E. P. Yukalova, V. S. Bagnato·Nov 15, 2002SaveLearn
Existence of Long-Range Order for Trapped Interacting BosonsWe derive an inequality governing ``long range'' order for a localized Bose-condensed state, relating the condensate fraction at a given temperature with effective curvature radius of the…Uwe R. Fischer·Nov 15, 2002SaveLearn
Percolation-dependent Reaction Rates in the Etching of Disordered SolidsA prototype statistical model for the etching of a random solid is investigated in order to assess the influence of disorder and temperature on the dissolution kinetics. At low temperature, the…K. M. Kolwankar, M. Plapp, B. Sapoval·Nov 14, 2002SaveLearn
Thermally Enhanced Neutralization in Hyperthermal Energy Ion ScatteringNeutralization probabilities are presented for hyperthermal energy Na+ ions scattered from a Cu(001) crystal as a function of surface temperature and scattered velocity. A large enhancement in…C. E. Sosolik, J. R. Hampton, A. C. Lavery et al.·Nov 14, 2002SaveLearn
Photo-emission properties of quasi-one-dimensional conductorsWe calculate the self-energy of one-dimensional electron band with the three-dimensional long range Coulomb interaction within the random phase approximation, paying particular attention to the…Z. Agic, P. Zupanovic, A. Bjelis·Nov 14, 2002SaveLearn
Ferromagnetism of a graphite nodule from the Canyon Diablo meteoriteThere have recently been various reports of weak ferromagnetism in graphite (1,2) and synthetic carbon materials (3) such as rhombohedral C60 (4), as well as a theoretical prediction of a…J. M. D. Coey, M. Venkatesan, C. B. Fitzgerald et al.·Nov 14, 2002SaveLearn
Preparation and structural properties of thin films and multilayers of the Heusler compounds Cu2MnAl, Co2MnSn, Co2MnSi and Co2MnGeWe report on the preparation of thin films and multilayers of the intermetallic Heusler compound CuMnAl, Co2MnSn, Co2MnSi and Co2MnGe by rf-sputtering on MgO and Al2O3 substrates. Cu2MnAl can be…U. Geiersbach, A. Bergmann, K. Westerholt·Nov 14, 2002SaveLearn
Interaction induced phase fluctuations in a guided atom laserIn this paper, we determine the magnitude of phase fluctuations caused by atom-atom interaction in a one-dimensional beam of bosonic atoms. We imagine that the beam is created with a large coherence…Isabelle Bouchoule, Klaus Moelmer·Nov 12, 2002SaveLearn
Magneto-Optical Kerr Effect of Iron Thin Films on Paramagnetic SubstratesFirst principles calculations of the magnetic properties and the magneto-optical Kerr effect (MOKE) of iron thin films epitaxially grown on the [001] surface of paramagnetic metals: copper, silver,…A. Debernardi, I. Galanakis, M. Alouani et al.·Nov 12, 2002SaveLearn
Quantum superpositions of clockwise and counterclockwise supercurrent states in the dynamics of a rf-SQUID exposed to a quantized electromagnetic fieldThe dynamical behavior of a superconducting quantum interference device (a rf-SQUID) irradiated by a single mode quantized electromagnetic field is theoretically investigated. Treating the SQUID as a…R. Migliore, A. Messina·Nov 11, 2002SaveLearn
V-V Bond-Length Fluctuations in VoxWe report a significantly stronger suppression of the phonon contribution to the thermal conductivity in VOx than can be accounted for by disorder of the 16 % atomic vacancies present in VO. Since…J. B. Goodenough, F. Rivadulla, E. Winkler et al.·Nov 11, 2002SaveLearn
Calculation of excited polaron states in the Holstein modelAn exact diagonalization technique is used to investigate the low-lying excited polaron states in the Holstein model for the infinite one-dimensional lattice. For moderate values of the adiabatic…Osor S. Barisic·Nov 10, 2002SaveLearn
Processing Information by Punctuated Spin SuperradianceThe possibility of realizing the regime of punctuated spin superradiance is advanced. In this regime, the number of superradiant pulses and the temporal intervals between them can be regulated. This…V. I. Yukalov, E. P. Yukalova·Nov 10, 2002SaveLearn
Waveguide containing a backward-wave slabWe have considered theoretically the waveguide properties of a plane two-layered waveguide, whose one layer is a usual magnetodielectric (forward-wave medium), but another one is a slab of so-called…I. S. Nefedov, S. A. Tretyakov·Nov 10, 2002SaveLearn
Spin Motion in Electron Transmission through Ultrathin Ferromagnetic Films Accessed by Photoelectron SpectroscopyAb initio and model calculations demonstrate that the spin motion of electrons transmitted through ferromagnetic films can be analyzed in detail by means of angle- and spin-resolved core-level…J. Henk, P. Bose, Th. Michael et al.·Nov 8, 2002SaveLearn
Interference effects in resonant magneto-transportWe study non-equilibrium magneto-transport through a single electron transistor or an impurity. We find that due to spin-flip transitions, generated by the spin-orbit interaction, the spectral…D. Mozyrsky, L. Fedichkin, S. A. Gurvitz et al.·Nov 8, 2002SaveLearn
Comments on: "Universal Features of Time Dynamics in a Left-Handed Perfect Lens" by G.Gomez-SantosRecently, we have shown the impossibility of perfect lensing with left-handed material slabs, gue to the divergence of the wavefield norm, and hence to the infinite enegy that would accumulate the…N. Garcia, M. Nieto-Vesperinas·Nov 7, 2002SaveLearn
Finite one dimensional impenetrable Bose systems: Occupation numbersBosons in the form of ultra cold alkali atoms can be confined to a one dimensional (1d) domain by the use of harmonic traps. This motivates the study of the ground state occupations λi of…P. J. Forrester, N. E. Frankel, T. M. Garoni et al.·Nov 7, 2002SaveLearn
Using ion production to monitor the birth and death of a metastable helium Bose-Einstein condensateWe discuss observations of the ion flux from a cloud of trapped metastable helium atoms. Both Bose-Einstein condensates and thermal clouds were investigated. The ion flux is compared to…S. Seidelin, O. Sirjean, J. Viana Gomes et al.·Nov 6, 2002SaveLearn