Network Transitivity and Matrix ModelsThis paper is a step towards a systematic theory of the transitivity (clustering) phenomenon in random networks. A static framework is used, with adjacency matrix playing the role of the dynamical…Z. Burda, J. Jurkiewicz, A. Krzywicki·Oct 10, 2003SaveLearn
Origin of non-exponential relaxation in a crystalline ionic conductor: a multi-dimensional 109Ag NMR studyThe origin of the non-exponential relaxation of silver ions in the crystalline ion conductor Ag7P3S11 is analyzed by comparing appropriate two-time and three-time 109Ag NMR correlation functions. The…M. Vogel, C. Brinkmann, H. Eckert et al.·Oct 10, 2003SaveLearn
Photoemission and the Electronic Structure of PuCoGa5The electronic structure of the first Pu based superconductor PuCoGa5 is explored using photoelectron spectroscopy and a novel theoretical scheme. Exceptional agreement between calculation and…J. J. Joyce, J. M. Wills, T. Durakiewicz et al.·Oct 9, 2003SaveLearn
Conditional dynamics driving financial marketsWe report empirical evidences on the existence of a conditional dynamics driving the evolution of financial assets which is found in several markets around the world and for different historical…M. Boguna, J. Masoliver·Oct 9, 2003SaveLearn
Long-Term Clustering, Scaling, and Universality in the Temporal Occurrence of EarthquakesScaling analysis reveals striking regularities in earthquake occurrence. The time between any one earthquake and that following it is random, but it is described by the same universal-probability…Alvaro Corral·Oct 9, 2003SaveLearn
Processing Issues in Top-Down Approaches to Quantum Computer Development in SiliconWe describe critical processing issues in our development of single atom devices for solid-state quantum information processing. Integration of single 31P atoms with control gates and single electron…S. -J. Park, A. Persaud, J. A. Liddle et al.·Oct 9, 2003SaveLearn
Soft modes in the easy plane pyrochlore antiferromagnetThermal fluctuations lift the high ground state degeneracy of the classical nearest neighbour pyrochlore antiferromagnet, with easy plane anisotropy, giving a first order phase transition to a long…J D M Champion, P C W Holdsworth·Oct 8, 2003SaveLearn
Electrons and Phonons on the Square Fibonacci TilingWe study the Schroedinger equation for an off-diagonal tight-binding hamiltonian, as well as the equations of motion for out-of-plane vibrations, on the separable square Fibonacci quasicrystal. We…Roni Ilan, Edo Liberty, Shahar Even-Dar Mandel et al.·Oct 8, 2003SaveLearn
Spin flip from dark to bright states in InP quantum dotsWe report measurements of the time for spin flip from dark (non-light emitting) exciton states in quantum dots to bright (light emitting) exciton states in InP quantum dots. Dark excitons are created…D. W. Snoke, J. Huebner, W. W. Ruehle et al.·Oct 8, 2003SaveLearn
Regular and Random Magnetic Resonance Force Microscopy Signal with a Cantilever Oscillating Parallel to a Sample SurfaceWe study theoretically the magnetic resonance force microscopy (MRFM) in oscillating cantilever-driven adiabatic reversals (OSCAR) technique, for the case when the cantilever tip oscillates parallel…G. P. Berman, V. N. Gorshkov, V. I. Tsifrinovich·Oct 8, 2003SaveLearn
Resonant nucleation of spatio-temporal order via parametric modal amplificationWe investigate, analytically and numerically, the emergence of spatio-temporal order in nonequilibrium scalar field theories. The onset of order is triggered by destabilizing interactions (DIs),…Marcelo Gleiser, Rafael C. Howell·Oct 7, 2003SaveLearn
Topological Excitation in an Antiferromagnetic Bose-Einstein CondensateTwo kinds of topological excitations, skyrmions and monopoles, are studied. It is revealed that these two types of excitations originate from different order parameter fields that reflect different…Yi-shi Duan, Jun-ping Wang, Xin Liu et al.·Oct 7, 2003SaveLearn
Dynamics of the spin-boson model with a structured environmentWe investigate the dynamics of the spin-boson model when the spectral density of the boson bath shows a resonance at a characteristic frequency Ω but behaves Ohmically at small frequencies. The…M. Thorwart, E. Paladino, M. Grifoni·Oct 7, 2003SaveLearn
Control of an atom laser using feedbackA generalised method of using feedback to control Bose-Einstein condensates is introduced. The condensates are modelled by the Gross-Pitaevskii equation, so only semiclassical fluctations can be…S. A. Haine, A. J. Ferris, J. D. Close et al.·Oct 7, 2003SaveLearn
Ultrafast Dynamic Control of Spin and Charge Density Oscillations in a GaAs Quantum WellWe use subpicosecond laser pulses to generate and monitor in real time collective oscillations of electrons in a modulation-doped GaAs quantum well. The observed frequencies match those of…J. M. Bao, L. N. Pfeiffer, K. W. West et al.·Oct 6, 2003SaveLearn
Nonlocal potentials for short-range electronic correlation in atoms, molecules, and solidsExtending density functional theory (DFT) to an ab initio orbital functional theory (OFT) requires new methodology for nonlocal exchange and correlation potentials. This paper describes such…R. K. Nesbet·Oct 6, 2003SaveLearn
Brownian motion approach to the ideal gas of relativistic particlesThe relativistic generalization of a free Brownian motion theory is presented. The global characteristics of the relaxation are explicitly found for the velocity and momentum (stochastic)…Ryszard Zygadło·Oct 6, 2003SaveLearn
Markovian diffusion approach to the relativistic ideal gas systemIt is shown that the usual identification of certain averages with the relativistic thermodynamical functions is not possible in the moving reference frame description. The Brownian motion approach…Ryszard Zygadło·Oct 6, 2003SaveLearn
Residual Resistance in a 2DES: A Phenomenological ApproachWe consider a simple phenomenological model of a semiconductor with absolute negative conductance in a magnetic field. We find the form of the domains of the electric field and current which arise as…A. F. Volkov, V. V. Pavlovskii·Oct 6, 2003SaveLearn
Effects of electrostatic fields and Casimir force on cantilever vibrationsThe effect of an external bias voltage and fluctuating electromagnetic fields on both the fundamental frequency and damping of cantilever vibrations is considered. An external voltage induces surface…A. A. Chumak, P. W. Milonni, G. P. Berman·Oct 3, 2003SaveLearn
Phase Diagrams of the Spin-1 Blume-Capel Film With an Alternating Crystal FieldThe spin-1 ferromagnetic Blume-Capel film with an alternating crystal field Δ=Δ1 on the odd layers and Δ=Δ2 on the even ones is considered in the mean field approximation. The ground state…Hamid Ez-Zahraouy, Ahmed Kassou-Ou-Ali·Oct 3, 2003SaveLearn
Phase Diagram of the BCC S=1/2 Heisenberg Antiferromagnet with First and Second Neighbor ExchangeWe use linked-cluster series expansions, both at T=0 and high temperature, to analyse the phase structure of the spin- Heisenberg antiferromagnet with competing first and second-neighbor…Jaan Oitmaa, Weihong Zheng·Oct 3, 2003SaveLearn
Computationally efficient phase-field models with interface kineticsWe present a new phase-field model of solidification which allows efficient computations in the regime when interface kinetic effects dominate over capillary effects. The asymptotic analysis required…Kalin Vetsigian, Nigel Goldenfeld·Oct 3, 2003SaveLearn
Spin relaxations in semiconductor quantum dotsThe spin relaxation time due to the electron-acoustic phonon scattering in GaAs quantum dots is studied after the exact diagonalization of the electron Hamiltonian with the spin-orbit coupling.…J. L. Cheng, M. W. Wu, C. Lü·Oct 2, 2003SaveLearn
Macroscopic evidence of quantum coherent oscillations of the total spin in the Mn-[3x3] molecular nanomagnetMolecular nanomagnets, besides promising to open new frontiers in technology, have attracted huge interest in the scientific community because they can exhibit the phenomenon known as quantum…S. Carretta, P. Santini, E. Liviotti et al.·Oct 2, 2003SaveLearn