2014

Nonlinear polarization waves in a two-component Bose-Einstein condensate – Archive ouverte HAL

A. M. KamchatnovY. V. KartashovP.-É. Larré 1 N. Pavloff A. M. Kamchatnov, Y. V. Kartashov, P.-É. Larré, N. Pavloff. Nonlinear polarization waves in a two-component Bose-Einstein condensate. Physical Review A, American Physical Society, 2014, 89, pp.033618. ⟨10.1103/PhysRevA.89.033618⟩. ⟨hal-03538709⟩ 1. LPTMS – Laboratoire de Physique Théorique et Modèles Statistiques

The fate of quantum wavefunction multifractality under perturbation

Ref. : R. Dubertrand, I. García-Mata, B. Georgeot, O. Giraud, G. Lemarié, and J. Martin, Two scenarios for quantum multifractality breakdown, Phys. Rev. Lett. 112, 234101 (2014). The concept of fractal geometry was introduced by Mandelbrot in the seventies, to describe a range of phenomena characterized by the fact that a certain quantity has a …

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Evolution of a complex electronic system to an ordered hidden state: optical quench in TaS2 – theory versus experiment

Contact: S. Brazovskii, brazov@lptms.u-psud.fr http://lptms.u-psud.fr/membres/brazov/ Femto-second optical techniques addressing pump-induced phase transitions (PIPT) put an ambitious goal to reach “hidden” states of matter – those which are not accessible and not known under equilibrium conditions or more conventional treatments. While there was a case of success in magnetic materials, there has been no success yet …

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New solutions to the Boltzmann equation

D. Guéry-Odelin, J. G. Muga, M.J. Ruiz- Montero and E. Trizac, Exact non-equilibrium solutions of the Boltzmann equation under a time-dependent external force, Physical Review Letters 112, 180602 (2014) In 1872, Boltzmann established a key bridge between microscopic dynamics and macroscopic irreversibility, through the H theorem: a dilute gas thereby evolves towards equilibrium, where it …

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Velocity filtration and temperature inversion in a system with long-range interactions

Lapo Casetti 1, 2 Shamik Gupta 3 6 pages, 9 figures, epj macros. 2014 Temperature inversion due to velocity filtration, a mechanism originally proposed to explain the heating of the solar corona, is demonstrated to occur also in a simple paradigmatic model with long-range interactions, the Hamiltonian mean-field model. Using molecular dynamics simulations, we show …

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Universal statistics of longest lasting records of random walks and Lévy flights

Claude Godreche 1 Satya N. Majumdar 2 Gregory Schehr 2 t14/073. 23 pages, 4 figures, Typos corrected. 2014 We study the record statistics of random walks after $n$ steps, $x_0, x_1,\ldots, x_n$, with arbitrary symmetric and continuous distribution $p(\eta)$ of the jumps $\eta_i = x_i – x_{i-1}$. We consider the age of the records, i.e. …

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Universal properties of branching random walks in confined geometries

Clélia De Mulatier 1, 2 Alain Mazzolo 2 Andrea Zoia 2 Europhysics Letters, EDP Science, 2014, 107, pp.30001 Characterizing the occupation statistics of a radiation flow through confined geometries is key to such technological issues as nuclear reactor design and medical diagnosis. This amounts to assessing the distribution of the travelled length $\ell$ and the …

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Universal Order and Gap Statistics of Critical Branching Brownian Motion

Kabir Ramola 1 Satya N. Majumdar 1 Gregory Schehr 1 Physical Review Letters, American Physical Society, 2014, 112, pp.210602 We study the order statistics of one dimensional branching Brownian motion in which particles either diffuse (with diffusion constant $D$), die (with rate $d$) or split into two particles (with rate $b$). At the critical point …

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