publications

Xavier Campi 1, Hubert Krivine 1, Nicolas Sator 1, Eric Plagnol 2 European Physical Journal D 11 (2000) 233-238 We show that the size distributions of fragments created by high energy nuclear collisions are remarkably well reproduced within the framework of a parameter free percolation model. We discuss two possible scenarios to explain this agreement and suggest that percolation could be an universal […]

Eugene Bogomolny 1 Nonlinearity 13 (2000) 947-972 In many problems of quantum chaos the calculation of sums of products of periodic orbit contributions is required. A general method of computation of these sums is proposed for generic integrable models where the summation over periodic orbits is reduced to the summation over integer vectors uniquely associated with periodic

Jérôme Houdayer 1, Olivier C. Martin 1 Europhysics Letters (EPL) 49 (2000) 794-800 A controversial issue in spin glass theory is whether mean field correctly describes 3-dimensional spin glasses. If it does, how can replica symmetry breaking arise in terms of spin clusters in Euclidean space? Here we argue that there exist system-size low energy excitations that are sponge-like, generating

Martin, T., Ouvry, S. Physical Review Letters 85 (2000) 223

S. Rouziere 1, S. Ravy 2, S. Brazovskii 3, J. -P. Pouget 2 Journal de Physique IV Colloque 9 (1999) Pr10-23 We present an x-ray study of doped charge density waves systems. When a 2k_f-charge density wave is strongly pinned to impurities, an interference effect gives rise to an asymmetry between the intensities of the +2k_f and -2k_f satellite reflections. Moreover, profile asymmetry

E. Akkermans 1, K. Mallick 1 Journal of Physics A 32 (1999) 7133-7143 We present an analysis of the Ginzburg-Landau equations for the description of a two-dimensional superconductor in a bounded domain. Using the properties of a special integrability point of these equations which allows vortex solutions, we obtain a closed expression for the energy of the superconductor. The

Christophe Texier 1, Alain Comtet 1 Physical Review Letters 82 (1999) 4220-4223 We show that the distribution of the time delay for one-dimensional random potentials is universal in the high energy or weak disorder limit. Our analytical results are in excellent agreement with extensive numerical simulations carried out on samples whose sizes are large compared to the localisation length

P. Leboeuf 1, M. Sieber 1, 2 Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 60 (1999) 3969-3972 We investigate the universality of correlation functions of chaotic and disordered quantum systems as an external parameter is varied. A new, general scaling procedure is introduced which makes the theory invariant under reparametrizations. Under certain general conditions we show that this

S. Brazovski 1, N. Kirova 1 Journal de Physique IV Colloque 9 (1999) Pr10-121 The rich order parameter of Spin Density Waves allows for an unusual object of a complex topological nature: a half-integer dislocation combined with a semi-vortex of the staggered magnetization. It becomes energetically preferable to ordinary dislocation due to enhanced Coulomb interactions in the semiconducting regime.

S. Brazovski 1, N. Kirova 1 Journal de Physique IV Colloque 9 (1999) Pr10-143 We suggest a theoretical picture for distributions of plastic deformations experienced by a sliding Charge Density Wave in the course of the conversion from the normal current at the contact to the collective one in the bulk. Several mechanisms of phase slips via creation and