Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 23: Symposium Renormalization and Scaling (SYRS) – Contributed Talks I

DY 23.5: Vortrag

Samstag, 5. März 2005, 15:00–15:15, TU H3010

Monte Carlo simulations of the 3D bond-diluted Potts model — •Wolfhard Janke², Christophe Chatelain¹, Bertrand Berche¹, and Pierre Emmanuel Berche³ — ¹Laboratoire de Physique des Matériaux, Université Henri Poincaré, Nancy 1, France — ²Institut für Theoretische Physik, Universität Leipzig, Germany — ³Groupe de Physique des Matériaux, Université de Rouen, France

Large-scale Monte Carlo simulations of the three-dimensional bond-diluted Ising and 4-state Potts model are presented. The phase diagram and the physical properties at the phase transition are mainly studied using finite-size scaling techniques. In the Potts case, numerical evidences for the existence of a tricritical point dividing a regime where the transition remains of first order and a second regime where the transition is softened to a continuous one by the influence of disorder are briefly summarized. In the former regime, the nature of the transition is essentially clarified through an analysis of the energy probability distribution. In the latter regime critical exponents are estimated. In this talk, the main emphasis is placed on a careful analysis of rare and typical events. Their identification and role is qualitatively discussed in both regimes.