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Condensed Matter papers — page 12

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Theory of non-Markovian Stochastic Resonance
We consider a two-state model of non-Markovian stochastic resonance (SR) within the framework of the theory of renewal processes. Residence time intervals are assumed to be mutually independent and…
Igor Goychuk, Peter HanggiSep 26, 2003
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Explicit and Hidden Symmetries in Quantum Dots and Quantum Ladders
The concept of dynamical hidden symmetries in the physics of electron tunneling through composite quantum dots (CQD) and quantum ladders (QL) is developed and elucidated. Quite generally, dynamical…
K. Kikoin, Y. Avishai, M. KiselevSep 26, 2003
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From Chaos to Disorder in Quasi-1D Billiards with Corrugated Surfaces
We study chaotic properties of eigenstates depending on the degree of complexity in boundaries of a 2D periodic billiard. Main attention is paid to the situation when the motion of a classical…
J. A. Méndez-Bermúdez, G. A. Luna-Acosta, F. M. IzrailevSep 25, 2003
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Self-Doping of Gold Chains on Silicon: A New Structural Model for Si(111)5x2-Au
A new structural model for the Si(111)5x2-Au reconstruction is proposed and analyzed using first-principles calculations. The basic model consists of a "double honeycomb chain" decorated by…
Steven C. ErwinSep 25, 2003
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Echo spectroscopy of bulk Bogoliubov excitations in trapped Bose-Einstein condensates
We propose and demonstrate an echo method to reduce the inhomogeneous linewidth of Bogoliubov excitations, in a harmonically-trapped Bose-Einstein condensate. Our proposal includes the transfer of…
E. Gershnabel, N. Katz, R. Ozeri et al.Sep 25, 2003
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The Network Topology of the Interbank Market
We provide an empirical analysis of the network structure of the Austrian interbank market based on a unique data set of the Oesterreichische Nationalbank (OeNB). We show that the contract size…
Michael Boss, Helmut Elsinger, Martin Summer et al.Sep 25, 2003
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Risk trading, network topology, and banking regulation
In the context of understanding the nature of the risk transformation process of the financial system we propose an iterative risk-trading game between several agents who build their trading…
Stefan Thurner, Rudolf Hanel, Stefan PichlerSep 25, 2003
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Dynamics of quantized vortices in superfluid helium and rotating Bose-Einstein condensates
In this article, we review the research on the dynamics of quantized vortices in superfluid helium and rotating Bose-Einstein condensates. First, after briefly reviewing the earlier research and…
Makoto Tsubota, Kenichi Kasamatsu, Tsunehiko ArakiSep 25, 2003
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Anomalous behavior of spin wave resonances in Ga1-xMnxAs thin films
We report ferromagnetic and spin wave resonance absorption measurements on high quality epitaxially grown Ga1-xMnxAs thin films. We find that these films exhibit robust ferromagnetic long-range…
T. G. Rappoport, P. Redlinski, X. Liu et al.Sep 24, 2003
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Statistical Physics of Unzipping DNA
The denaturation of double-stranded DNA as function of force and temperature is discussed. At room temperature, sequence heterogeneity dominates the physics of single molecule force-extension curves…
David R. NelsonSep 24, 2003
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Investigation of the spectra of coupled polaritons on the periodically modulated metallic layer and the narrow regions of anomalous transparency
The paper deals with the theoretical investigation of plane, normally incident electromagnetic wave transmission through the flat metal film whose dielectric constant has small periodical sinusoidal…
A. V. Kats, Y. V. BludovSep 24, 2003
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Density Fluctuation Mediated Superconductivity
We conpare predictions of the mean-field theory of supercnductivity for metallic systems on the border of a density instability for cubic and tetragonal lattices. The calculations are based on a…
P. Monthoux, G. G. LonzarichSep 24, 2003
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Non equivalent adsorption sites on the ZGB catalytic reaction model
We studied in this work a modified version of the Ziff, Gulari and Barshad (ZGB) model in which the adsorption probabilities of CO and O2 are site dependent. We employed Monte Carlo simulations to…
R. R. Fulco, B. C. S. GrandiSep 24, 2003
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Quadrupole-scissors modes and nonlinear mode coupling in trapped two-component Bose-Einstein condensates
We theoretically investigate quadrupolar collective excitations in two-component Bose-Einstein condensates and their nonlinear dynamics associated with harmonic generation and mode coupling. Under…
Kenichi Kasamatsu, Makoto Tsubota, Masahito UedaSep 24, 2003
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Stochastic gauge: a new technique for quantum simulations
We review progress towards direct simulation of quantum dynamics in many-body systems, using recently developed stochastic gauge techniques. We consider master equations, canonical ensemble…
P. D. Drummond, P. Deuar, J. F. Corney et al.Sep 23, 2003
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Strain, size and composition of InAs Quantum Sticks, embedded in InP, by means of Grazing Incidence X-ray Anomalous Diffraction
We have used x-ray anomalous diffraction to extract the x-ray structure factor of InAs quantum stick-like islands, embedded in InP. The average height of the quantum sticks (QSs), as deduced from the…
A. Letoublon, V. Favre-Nicolin, H. Renevier et al.Sep 23, 2003
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Phase-sensitive quantum effects in Andreev conductance of the SNS system of metals with macroscopic phase breaking length
The dissipative component of electron transport through the doubly connected SNS Andreev interferometer indium (S)-aluminium (N)-indium (S) has been studied. Within helium temperature range, the…
Yu. N. Chiang, O. G. ShevchenkoSep 23, 2003
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Fano interference and cross-section fluctuations in molecular photodissociation
We derive an expression for the total photodissociation cross section of a molecule incorporating both indirect processes that proceed through excited resonances, and direct processes. We show that…
Y. Alhassid, Y. V. Fyodorov, T. Gorin et al.Sep 23, 2003
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Short-range spin- and pair-correlations: a variational wave-function
A many-body wavefuction is postulated, which is sufficiently general to describe superconducting pair-correlations, and/or spin-correlations, which can occur either as long-range order or as…
D. van der MarelSep 23, 2003
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Slow Spin Relaxation in Two-Dimensional Electron Systems with Antidots
We report a Monte Carlo investigation of the effect of a lattice of antidots on spin relaxation in twodimensional electron systems. The spin relaxation time is calculated as a function of geometrical…
Yuriy V. Pershin, Vladimir PrivmanSep 22, 2003
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Spin textures in slowly rotating Bose-Einstein Condensates
Slowly rotating spin-1 Bose-Einstein condensates are studied through a variational approach based upon lowest Landau level calculus. The author finds that in a gas with ferromagnetic interactions,…
Erich J. MuellerSep 22, 2003
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First-principles investigation of the assumptions underlying Model-Hamiltonian approaches to ferromagnetism of 3d impurities in III-V semiconductors
We use first-principle calculations for transition metal impurities V, Cr, Mn, Fe, Co and Ni in GaAs as well as Cr and Mn in GaN, GaP and GaSb to identify the basic features of the electronic…
Priya Mahadevan, Alex ZungerSep 22, 2003
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Ferromagnetism in Mn doped GaAs due to substitutional-interstitial complexes
While most calculations on the properties of the ferromagnetic semiconductor GaAs:Mn have focussed on isolated Mn substituting the Ga site (MnGa), we investigate here whether alternate lattice…
Priya Mahadevan, Alex ZungerSep 22, 2003
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Relaxation of twisted vortices in the Faddeev-Skyrme model
We study vortex knotting in the Faddeev-Skyrme model. Starting with a straight vortex line twisted around its axis we follow its evolution under dissipative energy minimization dynamics. With low…
Jarmo Hietarinta, Juha Jäykkä, Petri SaloSep 22, 2003
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A quantum version of free energy - irreversible work relations
We give a quantum version of the Jarzynski relation between the distribution of work done over a certain time-interval on a system and the difference of equilibrium free energies. The main new…
Wojciech De Roeck, Christian MaesSep 22, 2003
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