Fakultät für Physik Physikalisches Kolloquium Prof. Leticia Cugliandolo Universite Pierre et Marie Curie - Paris 6 Phase ordering kinetics in two dimensions A system taken across a second order phase transition from its disordered into its symmetry-broken phase undergoes a phase ordering process. It is commonly accepted that after the quench the system enters a dynamic scaling regime. The celebrated classical two-dimensional Ising model with non-conserved order parameter dynamics (used to model magnetic systems) is a typical example in this class of systems. We recently revisited this problem from a geometric perspective finding a number of surprising features that were not appreciated before and that I will discuss in this talk. In particular, we showed that the dynamics after an instantaneous quench actually proceeds in two steps: in a first regime the dynamics approaches critical percolation, while in a subsequent regimes the system phase orders in the expected way. This phenomenon also exists in other two dimensional models with different microscopic dynamics. It opens the way to intriguing connections between coarsening and percolation theory. Montag, 09.05.2016, 16:15 Uhr Ort: Hörsaal 6
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