laboratoire de physique statistique
 
 
laboratoire de physique statistique

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COMPTES RENDUS PHYSIQUE 


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2013
Wetting by solid helium, a model system - Balibar, Sebastien
COMPTES RENDUS PHYSIQUE 14531-541 (2013)

Abstract : This is a review of the wetting properties of solid helium on various solid substrates. Due to its extreme purity and to its very fast growth dynamics, solid helium 4 is often considered as a model system in materials science. Several wetting phenomena have been studied with helium 4 crystals, namely contact angles on solid substrates with variable roughness, wetting on graphite where epitaxial growth takes place, the roughening transition as a function of film thickness, the wetting of grain boundaries by the liquid phase. (C) 2013 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
 
2012
Gross-Pitaevskii description of superfluid dynamics at finite temperature: A short review of recent results - Brachet, Marc
COMPTES RENDUS PHYSIQUE 13954-965 (2012)

Abstract : The Gross-Pitaevskii equation (GPE) describes the dynamics of superflows and Bose-Einstein Condensates (BEC) at very low temperature. When a truncation of Fourier modes is performed, the resulting truncated GPE (TGPE) can also describe the correct thermal behavior of a Bose gas, as long as all relevant modes are highly occupied [M.J. Davis, S.A. Morgan, K. Burnett, Simulations of Bose fields at finite temperature, Phys. Rev. Lett. 87 (16) (2001) 160402]. We review some of our group's recent GPE- and TGPE-based numerical studies of superfluid dynamics and BEC stability. The relations with experiments are discussed. (C) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
 
2008
The VKS experiment: turbulent dynamical dynamos - Aumaitre, Sebastien and BerhanU, Michael and Bourgoin, Mickael and Chiffaudel, Arnaud and Daviaud, Francois and Dubrulle, Berengere and Fauve, Stephan and Marie, Louis and Monchaux, Romain and Mordant, Nicolas and Odier, Philippe and Petrelis, Francois and Pinton, Jean-Francois and Plihon, Nicolas and Ravelet, Florent and Volk, Romain
COMPTES RENDUS PHYSIQUE 9689-701 (2008)

Abstract : The VKS experiment studies dynamo action in the flow generated inside a cylinder filled with liquid sodium by the rotation of coaxial impellers (the von Karman geometry). We report observations related to the self-generation of a stationary dynamo when the flow forcing is symmetric, i.e. when the impellers rotate in opposite directions at equal angular velocities. The bifurcation is found to be supercritical, with a neutral mode whose geometry is predominantly axisymmetric. We then report the different dynamical dynamo regimes observed when the flow forcing is asymmetric, including magnetic field reversals. We finally show that these dynamics display characteristic features of low dimensional dynamical systems despite the high degree of turbulence in the flow.
 
2007
Scaling laws of turbulent dynamos - Fauve, Stephan and Petrelis, Francois
COMPTES RENDUS PHYSIQUE 887-92 (2007)

Abstract : We consider magnetic fields generated by homogeneous isotropic and parity invariant turbulent flows. We show that simple scaling laws for the dynamo threshold, magnetic energy and Ohmic dissipation can be obtained depending on the value of the magnetic Prandtl number.
Cumulants and large deviations of the current through non-equilibrium steady states - Bodineau, Thierry and Derrida, Bernard
COMPTES RENDUS PHYSIQUE 8540-555 (2007)

Abstract : Using a generallisation of detailed balance for systems maintained out of equilibrium by contact with 2 reservoirs at unequal temperatures or at unequal densities, one can recover the fluctuation theorem for the large deviation function of the current. For large diffusive systems, we show how the large deviation function of the current can be computed using a simple additivity principle. The validity of this additivity principle and the occurrence of phase transitions are discussed in the framework of the macroscopic fluctuation theory.
Work, dissipation, and fluctuations in nonequilibrium physics - Foreword - Derrida, Bernard and Gaspard, Pierre and Van den Broeck, Christian
COMPTES RENDUS PHYSIQUE 8483-485 (2007)

Abstract : We introduce and present the proceedings of the conference ``Work, dissipation, and fluctuations in nonequilibrium physics'' held in Brussels, 22-25 March 2006 under the auspices of the International Solvay Institutes for Physics and Chemistry and organized by the Center for Nonlinear Phenomena and Complex Systems of the Universite Libre de Bruxelles.