Phonon-assisted relaxation kinetics of statistically-degenerate excitons in high-quality quantum wellsAcoustic-phonon-assisted thermalization kinetics of excitons in quantum wells (QWs) is developed for small concentrations of particles, ρ 2D 109 cm-1, when particle-particle…A. V. Soroko, A. L. Ivanov·Oct 25, 2001SaveLearn
Magnetic-field-induced collapse of charge-ordered nanoclusters and the Colossal Magnetoresistance effect in Nd(0.3)Sr(0.3)MnO(3)We report synchrotron x-ray scattering studies of charge/orbitally ordered (COO) nanoclusters in Nd0.7Sr0.3MnO3. We find that the COO nanoclusters are strongly suppressed in an applied…T. Y. Koo, V. Kiryukhin, P. A. Sharma et al.·Oct 25, 2001SaveLearn
Theoretical modeling of prion disease incubationWe present a theory for the laboratory and epidemiological data for incubation times in infectious prion diseases. The central feature of our model is that slow growth of misfolded protein-aggregates…R. V. Kulkarni, A. Slepoy, R. R. P. Singh et al.·Oct 24, 2001SaveLearn
Robustness of the van Hove scenario for high-Tc superconductorsThe pinning of the Fermi level to the van Hove singularity and the formation of flat bands in the two-dimensional t-t' Hubbard model is investigated by the renormalization group technique. The…V. Yu. Irkhin, A. A. Katanin, M. I. Katsnelson·Oct 24, 2001SaveLearn
On Low-Temperature Dephasing by Electron-Electron InteractionThe quantum coherence of electrons can be probed by studying weak localization corrections to the conductivity. Interaction effects lead to dephasing, with electron-electron interactions being the…D. S. Golubev, A. D. Zaikin, Gerd Schön·Oct 24, 2001SaveLearn
Landau-Zener interferometry for qubitsOne may probe intrinsic coherence of a qubit by periodically sweeping its control parameter. The qubit is then excited by Landau-Zener (LZ) mechanism. The interference between multiple LZ transition…A. V. Shytov, D. A. Ivanov, M. V. Feigel'man·Oct 23, 2001SaveLearn
Spatial decay of the single-particle density matrix in insulators: analytic results in two and three dimensionsAnalytic results for the asymptotic decay of the electron density matrix in insulators have been obtained in all three dimensions (D=1 - 3) for a tight-binding model defined on a simple cubic…S. N. Taraskin, D. A. Drabold, S. R. Elliott·Oct 22, 2001SaveLearn
Total Energy Studies for Ferromagnetic Nickel: What is the Optimum Combination of the Multi-band Gutzwiller Method and Density Functional Theory?The multi-band Gutzwiller method, combined with calculations based on density functional theory, is employed to study total energy curves of the ferromagnetic ground state of Ni. A new method is…T. Ohm, S. Weiser, R. Umstätter et al.·Oct 22, 2001SaveLearn
Possibility of Turbulent CrystalsThe possibility for the occurrence in crystals of a phenomenon, resembling turbulence, is discussed. This phenomenon, called heterophase turbulence, is manifested by the fluctuational…V. I. Yukalov, E. P. Yukalova·Oct 22, 2001SaveLearn
Vibrations in glasses and Euclidean Random Matrix theoryWe study numerically and analytically a simple off-lattice model of scalar harmonic vibrations by means of Euclidean random matrix theory. Since the spectrum of this model shares the most puzzling…T. S. Grigera, V. Martin-Mayor, G. Parisi et al.·Oct 21, 2001SaveLearn
Quantum fluctuations in coupled dark solitons in trapped Bose-Einstein condensatesWe show that the quantum fluctuations associated with the Bogoliubov quasiparticle vacuum can be strongly concentrated inside dark solitons in a trapped Bose Einstein condensate. We identify a finite…C. K. Law, P. T. Leung, M. -C. Chu·Oct 20, 2001SaveLearn
Dynamics of adsorbed islands with nanoscale resolutionSurface catalytic processes produce, under certain conditions, small clusters of adsorbed atoms or groups, called islands which, after they have been formed, move as individual entities. Here…N. Kruse, C. Voss, V. Medvedev et al.·Oct 19, 2001SaveLearn
Comment on "Peculiar Scaling of Self-Avoiding Walk Contacts"We demonstrate that the recently proposed Interacting Growth Walk (cond-mat/0108097) does not have the contact-scaling behaviour of Self-Avoiding Walk (M. Baiesi, E. Orlandini and A. L. Stella, Phys.…S. L. Narasimhan, P. S. R. Krishna, K. P. N. Murthy et al.·Oct 19, 2001SaveLearn
Bogoliubov theory of entanglement in a Bose-Einstein condensateWe consider a Bose-Einstein condensate which is illuminated by a short resonant light pulse that coherently couples two internal states of the atoms. We show that the subsequent time evolution…Anders S. Sorensen·Oct 18, 2001SaveLearn
Damping of spin waves and singularity of the longitudinal modes in the dipolar critical regime of the Heisenberg-ferromagnet EuSBy inelastic scattering of polarized neutrons near the (200)-Bragg reflection, the susceptibilities and linewidths of the spin waves and the longitudinal spin fluctuations were determined separately.…P. Boeni, B. Roessli, D. Goerlitz et al.·Oct 18, 2001SaveLearn
The magnetization process in the 2-dimensional J1-J2 modelWe study the alpha = J2/J1-dependence of the magnetization process in the J1-J2 model on a square lattice with frustrating couplings J2 along the diagonals. Perturbation expansions around…A. Fledderjohann, K. -H. Muetter·Oct 17, 2001SaveLearn
Effective nuclear temperature in a fluctuating spin systemWe report on very low temperature (27 mK) Mossbauer absorption spectra on Gd 155 in the Heisenberg frustrated antiferromagnets Gd2 Sn2 O7 (GdSn) and Gd2 Ti2 O7. We show that electronic fluctuations…E. Bertin, J. A. Hodges, J. -P. Bouchaud et al.·Oct 17, 2001SaveLearn
Electronic and magnetic structure of CsV2O5We have studied the electronic structure of the spin-gapped system CsV2O5 by means of an ab initio calculation. Our analysis and a re-examination of the susceptibility data indicate that the…Roser Valenti, T. Saha-Dasgupta·Oct 16, 2001SaveLearn
Quantum computing: a view from the enemy campQuantum computing relies on processing information within a quantum system with many continuous degrees of freedom. The practical implementation of this idea requires complete control over all of the…M. I. Dyakonov·Oct 16, 2001SaveLearn
Single-Electron Measurements with a Micromechanical ResonatorA mechanical electroscope based on a change in the resonant frequency of a cantilever one micron in size in the presence of charge has recently been fabricated. We derive the decoherence rate of a…R. E. S. Polkinghorne, G. J. Milburn·Oct 16, 2001SaveLearn
Mean-Field Approximation to the Master Equation for Sympathetic Cooling of Trapped BosonsWe use the mean-field approximation to simplify the master equation for sympathetic cooling of Bosons. For the mean single-particle occupation numbers, this approach yields the same equations as the…S. J. Wang, M. C. Nemes, A. N. Salgueiro et al.·Oct 15, 2001SaveLearn
Self-similar approach to market analysisA novel approach to analyzing time series generated by complex systems, such as markets, is presented. The basic idea of the approach is the Law of Self-Similar Evolution, according to which…V. I. Yukalov·Oct 15, 2001SaveLearn
Magneto-optics of organic crystalline field effect transistorsOrganic molecular FETs provide an experimental framework for studying the band-filling dependent properties of two-dimensional metals. Here, we propose experiments to investigate the band-filling…A. Ardavan, S. J. Blundell, J. Singleton·Oct 14, 2001SaveLearn
Split vortices in optically coupled Bose-Einstein condensatesWe study a rotating two-component Bose-Einstein condensate in which an optically induced Josephson coupling allows for population transfer between the two species. In a regime where separation of…J. J. Garcia-Ripoll, V. M. Perez-Garcia, F. Sols·Oct 13, 2001SaveLearn
Enhanced tunneling across nanometer-scale metal-semiconductor interfacesWe have measured electrical transport across epitaxial, nanometer-sized metal-semiconductor interfaces by contacting CoSi2-islands grown on Si(111) with an STM-tip. The conductance per unit area was…G. D. J. Smit, S. Rogge, T. M. Klapwijk·Oct 12, 2001SaveLearn