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Résumé |
The random field Ising model is a classic of statistical mechanics, which was proposed more than 40 years
ago by Imry and Ma. Because of its simplicity, it is relevant for describing many physical situations, both at
equilibrium and out-of-equilibrium. After describing some of these experimental realizations, I will present
the most striking features that were encountered in the theoretical study of this model (dimensional
reduction and its breaking, static avalanches ...). I will explain what are the minimal ingredients needed to
describe such situations from an analytic perspective. I will finally present the results we obtained in the
last decade, by making use of the functional renormalization group. |
