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Condensed Matter papers — page 13

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Teaching computers to fold proteins
A new general algorithm for optimization of potential functions for protein folding is introduced. It is based upon gradient optimization of the thermodynamic stability of native folds of a training…
Ole Winther, Anders KroghSep 22, 2003
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Autonomous Energy Transducer: Proposition, Example, Basic Characteristics
We propose a concept of autonomous energy transducer at a molecular scale, where output is produced with small input energy, of the same order of the thermal energy, without restriction of magnitude…
Naoko Nakagawa, Kunihiko KanekoSep 22, 2003
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Steady State and Relaxation Spectrum of the Oslo Rice-pile
We show that the one-dimensional Oslo rice-pile model is a special case of the abelian distributed processors model. The exact steady state of the model is determined. We show that the time evolution…
Deepak DharSep 22, 2003
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Structure of excited vortices with higher angular momentum in Bose-Einstein condensates
The structure of vortices in Bose-Einstein condensed atomic gases is studied taking into account many-body correlation effects. It is shown that for excited vortices the particle density in the…
Jian-Ming TangSep 22, 2003
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The Metal-Insulator Transition of the Magneli phase V4O7: Implications for V2O3
The metal-insulator transition (MIT) of the Magneli phase V4O7 is studied by means of electronic structure calculations using the augmented spherical wave method. The calculations are based on…
U. Schwingenschloegl, V. Eyert, U. EckernSep 21, 2003
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Aspect ratio dependence of charge transport in turbulent electroconvection
We present measurements of the normalized charge transport or Nusselt number Nu as a function of the aspect ratio Γ for turbulent convection in an electrically driven film. In analogy with…
Peichun Tsai, Zahir A. Daya, Stephen W. MorrisSep 19, 2003
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Staggered flux vortices and the superconducting transition in the layered cuprates
We propose an effective model for the superconducting transition in the high-Tc cuprates motivated by the SU(2) gauge theory approach. In addition to variations of the superconducting phase we allow…
Carsten Honerkamp, Patrick A. LeeSep 19, 2003
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A phase-field model of Hele-Shaw flows in the high viscosity contrast regime
A one-sided phase-field model is proposed to study the dynamics of unstable interfaces of Hele-Shaw flows in the high viscosity contrast regime. The corresponding macroscopic equations are obtained…
A. Hernandez-Machado, A. M. Lacasta, E. Mayoral et al.Sep 19, 2003
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Carbon Nanotube Based Bearing for Rotational Motions
We report the fabrication of a nanoelectromechanical system consisting of a plate rotating around a multiwalled nanotube bearing. The motion is possible thanks to the low intershell friction. Indeed,…
B. Bourlon, D. C. Glattli, A. Bachtold et al.Sep 19, 2003
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Fractional Diffusion Equation for a Power-Law-Truncated Levy Process
Truncated Levy flights are stochastic processes which display a crossover from a heavy-tailed Levy behavior to a faster decaying probability distribution function (pdf). Putting less weight on long…
I. M. Sokolov, A. V. Chechkin, J. KlafterSep 19, 2003
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Quantum Dissipative Dynamics of the Magnetic Resonance Force Microscope in the Single-Spin Detection Limit
We study a model of a magnetic resonance force microscope (MRFM) based on the cyclic adiabatic inversion technique as a high-resolution tool to detect single electron spins. We investigate the…
Hanno Gassmann, Mahn-Soo Choi, Hangmo Yi et al.Sep 19, 2003
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Angle Resolved Photemission Experiments to look for Time-reversal Violation in Cuprates
The recent experiments reported by Borisenko et al. (cond-mat/0305179 v2), are examined in light of the conditions to be satisfied in the search for time-reversal violation by circularly polarized…
J. C. Campuzano, A. Kaminski, C. M. VarmaSep 19, 2003
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Nonlinear optics of semiconductors under an intense terahertz field
A theory for nonlinear optics of semiconductors in the presence of an intense terahertz electric field is constructed based on the double-line Feynman diagrams, in which the nonperturbative effect of…
Ren-Bao Liu, Bang-Fen ZhuSep 18, 2003
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Novel Silicon-Carbon Fullerene-Like Cages: A Class of sp3-sp2 Covalent-Ionic Hybridized Nanosystems
A class of highly symmetric silicon carbide fullerene-like cage nanoclusters with carbon atoms inside the Si20 cage and with high stability are presented. The Generalized Gradient Approximation of…
M. N. Huda, A. K. RaySep 18, 2003
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Directed cycles and related structures in random graphs: I- Static properties
We study directed random graphs (random graphs whose edges are directed), and present new results on the so-called strong components of those graphs. We provide analytic and simulation results on two…
Valmir C. Barbosa, Raul Donangelo, Sergio R. SouzaSep 18, 2003
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Propagation in crossed electric and magnetic fields: The quantum source approach
The propagation of electrons in static and uniform electromagnetic fields is a standard topic of classical electrodynamics. The Hamilton function is given by a quadratic polynomial in the positions…
Tobias Kramer, Christian BracherSep 18, 2003
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Electron Exchange Coupling for Single Donor Solid-State Qubits
Inter-valley interference between degenerate conduction band minima has been shown to lead to oscillations in the exchange energy between neighbouring phosphorus donor electron states in silicon…
C. J. Wellard, L. C. L. Hollenberg, F. Parisoli et al.Sep 18, 2003
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Effect of Al substitution on the charge ordered Pr0.5Ca0.5MnO3: Structure, Magnetism and Transport
We report the effect of Mn site substitution of Al on the structural, magnetic and transport properties of charge ordered Pr0.5Ca0.5MnO3. This substitution introduces impurities in the…
Sunil Nair, A. BanerjeeSep 17, 2003
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Magnetic Tunnel Window's Imprint and Beyond
We report results from Monte Carlo simulations of systems of magnetic dipoles that relax through quantum tunneling, much as Fe8 crystals at very low temperature.For short times, a hole develops in…
J. J. Alonso, J. F. FernandezSep 17, 2003
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Quantum Monte Carlo simulation for the conductance of one-dimensional quantum spin systems
Recently, the stochastic series expansion (SSE) has been proposed as a powerful MC-method, which allows simulations at low T for quantum-spin systems. We show that the SSE allows to compute the…
Kim Louis, Claudius GrosSep 16, 2003
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Slow, Steady-State Transport with "Loading" and Bulk Reactions: the Mixed Ionic Conductor La2CuO4+δ
We consider slow, steady transport for the normal state of the superconductor La2CuO4+δ in a one-dimensional geometry, with surface fluxes sufficiently general to permit oxygen to be driven…
Wayne M. SaslowSep 16, 2003
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Magnetization Process of Single Molecule Magnets at Low Temperatures
We show that correlations established before quenching to very low temperatures, later drive the magnetization process of systems of single molecule magnets, after a magnetic field is applied at t=0.…
J. F. Fernandez, J. J. AlonsoSep 16, 2003
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Ultrafast photoinduced reflectivity transients in (Nd0.5Sr0.5)MnO3
The temperature dependence of ultrafast photoinduced reflectivity transients is reported in Nd0.5Sr0.5MnO3 thin film. The photoinduced reflectivity shows a complex response with very…
T. Mertelj, D. Mihailovic, Z. Jagličič et al.Sep 15, 2003
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Ordered (3x4) High Density Phase of Methylthiolate on Au(111)
The formation of ordered phases of dimethyl-disulfide on the Au(111) surface has been investigated by means of Low-Energy Electron Diffraction (LEED), X-ray Photoemission Spectroscopy (XPS), and…
V. De Renzi, D. Marchetto, R. Biagi et al.Sep 15, 2003
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A New Scenario on the Metal-Insulator Transition in VO2
The metal-insulator transition in VO2 was investigated using the three-band Hubbard model, in which the degeneracy of the 3d orbitals, the on-site Coulomb and exchange interactions, and the effects…
Arata TanakaSep 13, 2003
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