# Dresden 2006 – wissenschaftliches Programm

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# DY: Dynamik und Statistische Physik

## DY 14: Statistical Physics far from Thermal Eqilibrium

### DY 14.4: Vortrag

### Montag, 27. März 2006, 15:30–15:45, H\"UL 186

**Reentrance during nonequilibrium relaxation** — •Michel Pleimling^{1}, László Környei^{2}, and Ferenc Iglói^{2,3} — ^{1}Institut für Theoretische Physik I, Universität Erlangen-Nürnberg, Germany — ^{2}Institute for Theoretical Physics, Szeged University, Hungary — ^{3}Research Institute for Solid State Physics and Optics Budapest, Hungary

In nonequilibrium critical dynamics the system under consideration is prepared in some initial state from which it is quenched to the critical temperature and then let to evolve in time according to the given dynamical rules. Generally one is interested in the relaxation of the magnetization and in the behavior of the autocorrelation function. In most of the studied cases the initial state is of two kinds: it is either the (completely) ordered one or the (completely) disordered one. In this talk we show that an intriguing reentrance in time is encountered in critical relaxation measurements which start from a non-trivial initial state given by a ground state of the random field Ising model. Competition between two different mechanisms, the dissolution of the compact cells forming the initial state and the usual domain growth, is responsible for this novel feature in nonequilibrium critical dynamics.

[1] L. Környei, M. Pleimling, and F. Iglói, cond-mat/0509372