Implementing the Keldysh formalism into the ab initio Gaussian Embedded Cluster Method for the calculation of quantum transportWe discuss the key steps that have to be followed to calculate quantum transport out of equilibrium by means of the ab initio Gaussian Embedded Cluster Method recently developed by the authors.…E. Louis, J. A. Verges, J. J. Palacios et al.·Dec 5, 2002SaveLearn
Duality and Effective Conductivity of Two-dimensional Two-phase SystemsThe possible functional forms of the effective conductivity sigmaeff of the randomly inhomogeneous two-phase system at arbitrary values of concentrations are discussed. A new functional equation,…S. A. Bulgadaev·Dec 4, 2002SaveLearn
Exclusion particle models of limit order financial marketsUsing simple particle models of limit order markets, we argue that mid-term over-diffusive price behaviour is inherent to the very nature of these markets. Several rules for rate changes are…Damien Challet, Robin Stinchcombe·Dec 4, 2002SaveLearn
A source of cold atoms for a continuously loaded magnetic guideWe present an intense source of 87Rb atoms that has been set up to produce a continuous, slow and cold beam in a magnetic guide. It consists of a two-dimensional magneto-optical trap whose…C. F. Roos, P. Cren, J. Dalibard et al.·Dec 3, 2002SaveLearn
Time-Dependent Random Walks and the Theory of Complex Adaptive SystemsMotivated by novel results in the theory of complex adaptive systems, we analyze the dynamics of random walks in which the jumping probabilities are time-dependent. We determine the survival…Shahar Hod·Dec 3, 2002SaveLearn
Valency of rare earths in RIn3 and RSn3: Ab initio analysis of electric-field gradientsIn RIn3 and RSn3 the rare earth (R) is trivalent, except for Eu and Yb, which are divalent. This was experimentally determined in 1977 by perturbed angular correlation measurements of the…S. Jalali Asadabadi, S. Cottenier, H. Akbarzadeh et al.·Dec 2, 2002SaveLearn
Exact analytic solution for the generalized Lyapunov exponent of the 2-dimensional Anderson localizationThe Anderson localization problem in one and two dimensions is solved analytically via the calculation of the generalized Lyapunov exponents. This is achieved by making use of signal theory. The…V. N. Kuzovkov, W. von Niessen, V. Kashcheyevs et al.·Dec 2, 2002SaveLearn
Interplay between Quantum and Coherent Effects in OpticsA technique is presented for treating strongly nonstationary and transient processes in optics, permitting one to take into account both types of competing with each other effects, quantum as well as…V. I. Yukalov·Nov 29, 2002SaveLearn
An entangled two photon source using biexciton emission of an asymmetric quantum dot in a cavityA semiconductor based scheme has been proposed for generating entangled photon pairs from the radiative decay of an electrically-pumped biexciton in a quantum dot. Symmetric dots produce polarisation…T. M. Stace, G. J. Milburn, C. H. W. Barnes·Nov 29, 2002SaveLearn
Topological Coherent Modes for Nonlinear Schrödinger EquationNonlinear Schrödinger equation, complemented by a confining potential, possesses a discrete set of stationary solutions. These are called coherent modes, since the nonlinear Schrödinger equation…V. I. Yukalov, E. P. Yukalova·Nov 28, 2002SaveLearn
Solitons on H-bonds in proteinsA model for soliton dynamics on a hydrogen-bond network in helical proteins is proposed. It employs in three dimensions the formalism of fully integrable Toda lattices which admits phonons as well as…Francesco d'Ovidio, Henrik Bohr, Per-Anker Lindgaard·Nov 27, 2002SaveLearn
Theory of magnetic bipolar transistorsThe concept of a magnetic bipolar transistor (MBT) is introduced. The transistor has at least one magnetic region (emitter, base, or collector) characterized by spin-splitting of the carrier bands.…Jaroslav Fabian, Igor Zutic, S. Das Sarma·Nov 27, 2002SaveLearn
Hidden symmetries of two-electron quantum dots in a magnetic fieldUsing a classical and quantum mechanical analysis, we show that the magnetic field gives rise to dynamical symmetries of a three-dimensional axially symmetric two-electron quantum dot with a…N. S. Simonovic, R. G. Nazmitdinov·Nov 27, 2002SaveLearn
Scaling of the magnetic linear response in phase-ordering kineticsThe scaling of the thermoremanent magnetization and of the dissipative part of the non-equilibrium magnetic susceptibility is analysed as a function of the waiting-time s for a simple ferromagnet…Malte Henkel, Matthias Paessens, Michel Pleimling·Nov 26, 2002SaveLearn
Non-Gaussian dynamics from a simulation of a short peptide: Loop closure rates and effective diffusion coefficientsIntrachain contact formation rates, fundamental to the dynamics of biopolymer self-organization such as protein folding, can be monitored in the laboratory through fluorescence quenching…John J. Portman·Nov 26, 2002SaveLearn
Relaxation and Coarsening Dynamics in Superconducting ArraysWe investigate the nonequilibrium coarsening dynamics in two-dimensional overdamped superconducting arrays under zero external current, where ohmic dissipation occurs on junctions between…Gun Sang Jeon, Sung Jong Lee, M. Y. Choi·Nov 26, 2002SaveLearn
Spin dynamics of stripesThe spin dynamics of stripes in high-temperature superconductors and related compounds is studied in the framework of a spin-wave theory for a simple spin-only model. The magnon dispersion relation…Frank Krüger, Stefan Scheidl·Nov 26, 2002SaveLearn
Thermoelectric effects of an Aharonov-Bohm interferometer with an embedded quantum dot in the Kondo regimeThermoelectric effects are studied in an Aharonov-Bohm (AB) interferometer with an embedded quantum dot in the Kondo regime. The AB flux-dependent transmission probability has an asymmetrical shape…Tae-Suk Kim, S. Hershfield·Nov 25, 2002SaveLearn
beta-Cu3V2O8: Magnetic ordering in a spin-1/2 kagome-staircase latticeThe spin-1/2 Cu2+ ions in beta-Cu3V2O8 occupy the sites of a Kagome-staircase lattice, an anisotropic variant of the Kagome net: buckled layers and imbedded plaquettes of three edge-shared CuO4…N. Rogado, M. K. Haas, G. Lawes et al.·Nov 25, 2002SaveLearn
The Kagome-staircase lattice: Magnetic ordering in Ni3V2O8 and Co3V2O8Ni3V2O8 and Co3V2O8 have spin-1 and spin-3/2 magnetic lattices that are a new anisotropic variant of the Kagome net, wherein edge-sharing MO6 octahedra form the rises and rungs of a "Kagome…N. Rogado, G. Lawes, D. A. Huse et al.·Nov 25, 2002SaveLearn
Spatially heterogeneous ages in glassy dynamicsWe construct a framework for the study of fluctuations in the nonequilibrium relaxation of glassy systems with and without quenched disorder. We study two types of two-time local correlators with the…Horacio E. Castillo, Claudio Chamon, Leticia F. Cugliandolo et al.·Nov 25, 2002SaveLearn
Spin-polarized current oscillations in diluted magnetic semiconductor multiple quantum wellsWe study the spin and charge dynamics of electrons in n-doped II--VI semiconductor multiple quantum wells when one or more quantum wells are doped with Mn. The interplay between strongly nonlinear…Manuel Bejar, David Sanchez, Gloria Platero et al.·Nov 25, 2002SaveLearn
Ballistic expansion of a dipolar condensateWe have studied the free expansion of a Bose condensate in which both the usual s-wave contact interaction and the dipole-dipole interaction contribute considerably to the total interaction energy.…Stefano Giovanazzi, Axel Gorlitz, Tilman Pfau·Nov 25, 2002SaveLearn
The 4-loop beta-function in the 2D Non-Abelian Thirring model, and comparison with its conjectured "exact" formRecently, B. Gerganov, A. LeClair and M. Moriconi [Phys. Rev. Lett. 86 (2001) 4753] have proposed an "exact" (all orders) beta-function for 2-dimensional conformal field theories with…Andreas W. W. Ludwig, Kay Joerg Wiese·Nov 25, 2002SaveLearn
Non-adiabatic charge pump: an exact solutionWe derived a general and exact expression of current for quantum parametric charge pumps in the non-adiabatic regime at finite pumping frequency and finite driving amplitude. The non-perturbative…Baigeng Wang, Jian Wang, Hong Guo·Nov 24, 2002SaveLearn