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Condensed Matter papers — page 36

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Theory of Quantum Optical Control of Single Spin in a Quantum Dot
We present a theory of quantum optical control of an electron spin in a single semiconductor quantum dot via spin-flip Raman transitions. We show how an arbitrary spin rotation may be achieved by…
Pochung Chen, C. Piermarocchi, L. J. Sham et al.Jan 22, 2003
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Rotating Superfluid Turbulence
Almost all studies of vortex states in helium II have been concerned with either ordered vortex lattices or disordered vortex tangles. This work studies numerically what happens in the presence of…
Makoto Tsubota, Tsunehiko Araki, Carlo. F. BarenghiJan 22, 2003
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Tunneling ionization of deep centers in high frequency electric fields
Experimental and theoretical work on the ionization of deep impurity centers in the alternating terahertz field of high-intensity far-infrared laser radiation, with photon energies tens of times…
S. D. Ganichev, I. N. Yassievich, W. PrettlJan 22, 2003
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Debt Subordination and The Pricing of Credit Default Swaps
First passage models, where corporate assets undergo a random walk and default occurs if the assets fall below a threshold, provide an attractive framework for modeling the default process. Recently…
Peter B. Lee, Mark B. Wise, Vineer BhansaliJan 22, 2003
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Zero temperature damping of Bose-Einstein condensate oscillations by vortex-antivortex pair creation
We investigate vortex-antivortex pair creation in a supersonically expanding and contracting quasi-2D Bose-Einstein condensate at zero temperature. For sufficiently large amplitude condensate…
Petr O. Fedichev, Uwe R. Fischer, Alessio RecatiJan 21, 2003
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Hierarchically Organized Minority Games
In this paper a hierarchical extension of the Minority Game is defined and studied. Numerical simulations show a special type of emergent global behavior between separated parts of the hierarchical…
Csaba Foldy, Zoltan Somogyvari, Peter ErdiJan 21, 2003
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Monopolar Optical Orientation of Electronic Spins in Semiconductors
It is shown that absorption of circularly polarized infrared radiation due to intraband (Drude-like) transitions in n-type bulk semiconductors and due to intra-subband or inter-subband transitions in…
S. A. Tarasenko, E. L. Ivchenko, V. V. Bel'kov et al.Jan 21, 2003
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Spin-Galvanic Effect in Quantum Wells
It is shown that a homogeneous non-equlibrium spin-polarization in semiconductor heterostructures results in an electric current. The microscopic origin of the effect is an inherent asymmetry of…
S. D. Ganichev, E. L. Ivchenko, V. V. Bel'kov et al.Jan 21, 2003
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Spin-photocurrent in p-SiGe quantum wells under terahertz laser irradiation
A detailed study of the circular photogalvanic effect (CPGE) in SiGe structures is presented. It is shown that the CPGE becomes possible due to the built-in asymmetry of quantum wells (QWs) in…
V. V. Bel'kov, S. D. Ganichev, Petra Schneider et al.Jan 21, 2003
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Optical Spin Orientation under Inter- and Intra-Subband Transitions in QWs
It is shown that absorption of circularly polarized infrared radiation achieved by inter-subband and intra-subband (Drude-like) transitions results in a monopolar spin orientation of free carriers.…
S. A. Tarasenko, E. L. Ivchenko, V. V. Bel'kov et al.Jan 21, 2003
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A model metal potential exhibiting polytetrahedral clusters
Putative global minima have been located for clusters interacting with an aluminium glue potential for N<190. Virtually all the clusters have polytetrahedral structures, which for larger sizes…
Jonathan P. K. DoyeJan 21, 2003
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Simulation and analysis of in vitro DNA evolution
We study theoretically the in vitro evolution of a DNA sequence by binding to a transcription factor. Using a simple model of protein-DNA binding and available binding constants for the Mnt protein,…
Morten Kloster, Chao TangJan 21, 2003
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Josephson nanocircuit in the presence of linear quantum noise
We derive the effective hamiltonian for a charge-Josephson qubit in a circuit with no use of phenomenological arguments, showing how energy renormalizations induced by the environment appear with no…
E. Paladino, F. Taddei, G. Giaquinta et al.Jan 20, 2003
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Nonlinear dynamics of dimers on periodic substrates
We study the dynamics of a dimer moving on a periodic one-dimensional substrate as a function of the initial kinetic energy at zero temperature. The aim is to describe, in a simplified picture, the…
C. Fusco, A. Fasolino, T. JanssenJan 20, 2003
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Surface Instability of a Multi-Component Condensate and Andreev-Bashkin effect
It is shown that surface of a liquid consisting of several interpenetrating superfluids becomes unstable at some threshold. We demonstrate that the criterion for the onset of the instability changes…
D. A. AbaninJan 20, 2003
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Comment on ``Quasisaddles as relevant points of the potential energy surface in the dynamics of supercooled liquids'' [J. Chem. Phys. 116, 10297 (2002); cond-mat/0203301]
Recently, the properties of supercooled liquids have been studied by mapping instaneous configurations onto minima of the gradient squared. It was originally suggested that this mapping would probe…
Jonathan P. K. Doye, David J. WalesJan 20, 2003
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Local Distributions and Rate Fluctuations in a Unified Scaling Law for Earthquakes
A recently proposed unified scaling law for interoccurrence times of earthquakes [P. Bak et al., Phys. Rev. Lett. 88, 178501 (2002)] is analyzed, both theoretically and with data from Southern…
Alvaro CorralJan 17, 2003
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Polaronic Heat Capacity in The Anderson - Hasegawa Model
An exact treatment of the Anderson - Hasegawa two - site model, incorporating the presence of superexchange and polarons, is used to compute the heat capacity. The calculated results point to the…
Manidipa Mitra, P. A. Sreeram, Sushanta DattaguptaJan 16, 2003
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Relaxation and Metastability in the RandomWalkSAT search procedure
An analysis of the average properties of a local search resolution procedure for the satisfaction of random Boolean constraints is presented. Depending on the ratio alpha of constraints per variable,…
Guilhem Semerjian, Remi MonassonJan 15, 2003
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Chaos and the Quantum Phase Transition in the Dicke Model
We investigate the quantum chaotic properties of the Dicke Hamiltonian; a quantum-optical model which describes a single-mode bosonic field interacting with an ensemble of N two-level atoms. This…
Clive Emary, Tobias BrandesJan 15, 2003
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Tight-binding g-Factor Calculations of CdSe Nanostructures
The Lande g-factors for CdSe quantum dots and rods are investigated within the framework of the semiempirical tight-binding method. We describe methods for treating both the n-doped and neutral…
Joshua Schrier, K. Birgitta WhaleyJan 14, 2003
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Complete identification of alkali sites in ion conducting lithium silicate glasses: a computer study of ion dynamics
The available sites for ions in a typical disordered ionic conductor are determined. For this purpose we devised a straightforward algorithm which via cluster analysis identifies these sites from…
Heiko Lammert, Magnus Kunow, Andreas HeuerJan 14, 2003
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Ferromagnetic/superconducting proximity effect in La0.7Ca0.3MnO3 / YBa2Cu3O7 superlattices
We study the interplay between magnetism and superconductivity in high quality YBa2Cu3O7 (YBCO) / La0.7Ca0.3MnO3(LCMO)superlattices. We find evidence for the YBCO superconductivity depression in…
Z. Sefrioui, D Arias, V. Pena et al.Jan 14, 2003
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Scaling and universality in ontogenetic growth
Recently, West et al. claimed to derive a general quantitative model based on fundamental principles for the allocation of metabolic energy between maintenance of existing tissue and the production…
Jayanth R. Banavar, John Damuth, Amos Maritan et al.Jan 14, 2003
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Non-Fermi liquid behavior of the electrical resistivity at the ferromagnetic quantum critical point
We propose a model for the non-Fermi behavior in the proximity of the quantum phase transition induced by the strong polarization of the electrons due to local magnetic moments. The self - consistent…
D. Bodea, M. Crisan, I. Grosu et al.Jan 14, 2003
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