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Condensed Matter papers — page 52

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Anomalous Transport in Conical Granular Piles
Experiments on 2+1-dimensional piles of elongated particles are performed. Comparison with previous experiments in 1+1 dimensions shows that the addition of one extra dimension to the dynamics…
Peter Ahlgren, Mikkel Avlund, Ib Klewe et al.Jul 26, 2002
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Molecular Bose-Einstein condensate as an amplifier of weak interactions
Collisions and chemical reactions of molecules in Bose-Einstein condensates (BECs) are extremely sensitive to weak fields. This sensitivity arises due to the high density of compound resonances and a…
V. V. Flambaum, J. S. M. GingesJul 26, 2002
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Quantum Monte Carlo study of the 3D-1D crossover for a trapped Bose gas
We investigate the cross-over from three to one dimension in a Bose gas confined in highly anisotropic traps. By using Quantum Monte-Carlo techniques, we solve the many-body Schrodinger equation for…
G. E. Astrakharchik, S. GiorginiJul 25, 2002
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Effective resistivity of magnetic multilayers
In heterogeneous system, the correspondence between calculated and measured quantities, such as the conductivity or the resistivity, is not obvious since the former ones are local quantities whereas…
A. Crépieux, P. BrunoJul 25, 2002
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Theory for tailoring sonic devices: Diffraction dominates over Refraction
In the moderately long wavelength propagation regime, acoustic crystaldevices which size is of several wave lengths are studied by using thefinite-difference time domain method. It is shown by the…
N. Garcia, M. Nieto-Vesperinas, E. V. Ponizovskaya et al.Jul 24, 2002
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Light Scattering in Transparent Glass Ceramics
Transparent glass ceramic materials, with microstructures comprised of dispersed nanocrystallites in a residual glass matrix, offer the prospect of nonlinear optical properties. However, good…
Shaun C. HendyJul 24, 2002
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A theoretical study of the structural phases of Group 5B - 6B metals and their transport properties
In order to predict the stable and metastable phases of the bcc metals in the block of the Periodic Table defined by groups 5B to 6B and periods 4 to 6, as well as the structure dependence of their…
N. O. Nnolim, T. A. Tyson, L. AxeJul 24, 2002
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Comment on ``Experimental violations of the second law of thermodynamics for small systems and short timescales''
The experimental verification of the Fluctuation Theorem by Wang et al. is not a violation but even a confirmation of the second law, resulting from their observations in a proper interpretation.
Theo M. Nieuwenhuizen, Armen E. AllahverdyanJul 24, 2002
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Pre-avalanche instabilities in a granular pile
We investigate numerically the transition between static equilibrium and dynamic surface flow of a 2D cohesionless granular system driven by a continuous gravity loading. This transition is…
Lydie Staron, Jean-Pierre Vilotte, Farhang RadjaiJul 24, 2002
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Phase transitions and volunteering in spatial public goods games
Cooperative behavior among unrelated individuals in human and animal societies represents a most intriguing puzzle to scientists in various disciplines. Here we present a simple yet effective…
Gyorgy Szabo, Christoph HauertJul 24, 2002
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Surface-reconstructed Icosahedral Structures for Lead Clusters
We describe a new family of icosahedral structures for lead clusters. In general, structures in this family contain a Mackay icosahedral core with a reconstructed two-shell outer-layer. This family…
Shaun C. Hendy, Jonathan P. K. DoyeJul 23, 2002
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Study of Percolative Transitions with First-Order Characteristics in the Context of CMR Manganites
The unusual magneto-transport properties of manganites are widely believed to be caused by mixed-phase tendencies and concomitant percolative processes. However, dramatic deviations from…
J. Burgy, M. Mayr, E. DagottoJul 23, 2002
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Two spaces that already found their geometer in the thirties
Giorgio Parisi's recent speculations on the concept of continuous dimension (cond-mat/0207334) are compared with Von Neumann's serious work.
Gavriel SegreJul 23, 2002
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Remarks on the monotonicity of default probabilities
The consultative papers for the Basel II Accord require rating systems to provide a ranking of obligors in the sense that the rating categories indicate the creditworthiness in terms of default…
Dirk TascheJul 23, 2002
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System size coherence resonance
We show the existence of a system size coherence resonance effect for an ensemble of globally coupled excitable systems. Namely, we demonstrate numerically that the regularity in the signal emitted…
Raul Toral, Claudio Mirasso, James D. GuntonJul 23, 2002
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Systematic generation of finite-range atomic basis sets for linear-scaling calculations
Basis sets of atomic orbitals are very efficient for density functional calculations but lack a systematic variational convergence. We present a variational method to optimize numerical atomic…
E. Anglada, J. Soler, J. Junquera et al.Jul 23, 2002
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Suppression of the bottleneck in semiconductor microcavities
The relaxation kinetics of cavity polaritons by scattering with thermal acoustic phonons is studied within the rate equation approximation. Numerical results show that a suppression of the bottleneck…
T. D. Doan, D. B. Tran ThoaiJul 23, 2002
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Phase Coherent Precessional Magnetization Reversal in Micro-scopic Spin Valve Elements
We study the precessional switching of the magnetization in microscopic spin valve cells induced by ultra short in-plane hard axis magnetic field pulses. Stable and highly efficient switching is…
H. W. Schumacher, C. Chappert, P. Crozat et al.Jul 23, 2002
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Propagation of waves in metallic photonic crystals at low frequencies and some theoretical aspects of left-handed materials
An analytical theory of low frequency electromagnetic waves in metallic photonic crystals with a small volume fraction of a metal is presented. The evidence of the existence of such waves has been…
A. L. Pokrovsky, A. L. EfrosJul 22, 2002
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Diffraction theory and focusing of light by left-handed materials
A diffraction theory in a system consisting of left-handed and right-handed materials is proposed. The theory is based upon the Huygens's principle and the Kirchhoff's integral and it is…
A. L. Pokrovsky, A. L. EfrosJul 22, 2002
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Roughness of Interfacial Crack Front: Correlated Percolation in the Damage Zone
We show that the roughness exponent zeta of an in-plane crack front slowly propagating along a heterogeneous interface embeded in a elastic body, is in full agreement with a correlated percolation…
Jean Schmittbuhl, Alex Hansen, G. George BatrouniJul 22, 2002
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Ballistic Magnetoresitance over 4000% at Room Temperature in Ni-Ni Electrodeposited Nanocontacts
This paper reports ballistic magnetoresistance values over 4000% measured in electrodeposited Ni-Ni nanocontacts with T geometry previously developed . Over the time, after several magnetic field…
Hai Wang, H. Cheng, N. GarciaJul 22, 2002
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Optimal quantum pump in the presence of a superconducting lead
We investigate the parametric pumping of a hybrid structure consisting of a normal quantum dot, a normal lead and a superconducting lead. Using the time dependent scattering matrix theory, we have…
Baigeng Wang, Jian WangJul 20, 2002
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Cooperative Ring Exchange and Quantum Melting of Vortex Lattices in Atomic Bose-Einstein Condensates
Cooperative ring-exchange is suggested as a mechanism of quantum melting of vortex lattices in a rapidly-rotating quasi two dimensional atomic Bose-Einstein condensate (BEC). Using an approach…
Tarun Kanti Ghosh, G. BaskaranJul 19, 2002
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Comment on ''Electromagnetic Surface Modes at Interfaces with Negative Refractive Index make a Non-Quite Perfect Lens''
Comment on ''Electromagnetic Surface Modes at Interfaces with Negative Refractive Index make a Non-Quite Perfect Lens''
N. Garcia, M. Nieto-VesperinasJul 19, 2002
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