2004

A. Andreanov, Francesca Barbieri, Olivier C. Martin 1 European Physical Journal B 41 (2004) 365 The ground-state energy E_0 of a spin glass is an example of an extreme statistic. We consider the large deviations of this energy for a variety of models when the number of spins N goes to infinity. In most cases, the behavior can be understood […]

Satya Majumdar 1, 2, Dibyendu Das 3, Jane’ Kondev 4, Bulbul Chakraborty 4 Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 70 (2004) 060501 An exact solution of a Landau model of an order-disorder transition with activated critical dynamics is presented. The model describes a funnel-shaped topography of the order parameter space in which the number of energy lowering trajectories rapidly diminishes as

Denis Ullmo 1, 2, Hong Jiang 2, 3, Weitao Yang 3, Harold U. Baranger 2 Physical Review B 70 (2004) 205309 We analyze the ground state energy and spin of quantum dots obtained from spin density functional theory (SDFT) calculations. First, we introduce a Strutinsky-type approximation, in which quantum interference is treated as a correction to a smooth Thomas-Fermi description. For large irregular dots, we find

Campi, X., Krivine, H. Europhysics Letters 66 (2004) 527-530

Markus Muller 1, Marc Mézard 1, Andrea Montanari 2 Journal of Chemical Physics 120 (2004) 11233 We develop a new analytic approach for the study of lattice heteropolymers, and apply it to copolymers with correlated Markovian sequences. According to our analysis, heteropolymers present three different dense phases depending upon the temperature, the nature of the monomer interactions, and the sequence correlations:

Olivier Rivoire 1, Giulio Biroli 2, Olivier C. Martin 1, Marc Mézard 1 European Physical Journal B 37 (2004) 55-78 We consider « lattice glass models » in which each site can be occupied by at most one particle, and any particle may have at most l occupied nearest neighbors. Using the cavity method for locally tree-like lattices, we derive the phase diagram, with a particular

Barrat, A., Trizac, E. Bulletin de la Société Française de Physique 146 (2004) 28

Sergio Caracciolo 1, Jesper-Lykke Jacobsen 2, Hubert Saleur 3, 4, Alan D. Sokal 5, Andrea Sportiello 1 Physical Review Letters 93 (2004) 080601 We prove a generalization of Kirchhoff’s matrix-tree theorem in which a large class of combinatorial objects are represented by non-Gaussian Grassmann integrals. As a special case, we show that unrooted spanning forests, which arise as a q \to 0 limit of the Potts model,

Martina Hentschel 1, Denis Ullmo 1, 2, Harold U. Baranger 1 Physical Review Letters 93 (2004) 176807 We study the x-ray edge problem for a chaotic quantum dot or nanoparticle displaying mesoscopic fluctuations. In the bulk, x-ray physics is known to produce deviations from the naively expected photoabsorption cross section in the form of a peaked or rounded edge. For a coherent system

A. C. Bertuola 1, O. Bohigas 2, M. P. Pato 1 Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 70 (2004) 065102 Using the Generalized Maximium Entropy Principle based on the nonextensive q entropy a new family of random matrix ensembles is generated. This family unifies previous extensions of Random Matrix Theory and gives rise to an orthogonal invariant stable