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DY: Dynamik und Statistische Physik

DY 23: Statistical Physics (general) II

DY 23.1: Talk

Tuesday, March 28, 2006, 11:45–12:00, SCH 251

Strong disorder fixed point in the dissipative random transverse field Ising model — •gregory schehr and heiko rieger — Theoretische Physik, Universität Saarbrücken

We study the zero temperature equilibrium properties of the random transverse Ising model (RTFIM) where each spin is coupled to an ohmic bath of harmonic oscillators. We propose a real space renormalization group (RG) procedure that we then study numerically. We determine the phase diagram and the critical exponents, which are foud to be independent of the dissipative strength. In addition we find some indication for a diverging dynamical exponent when approaching the transition, suggesting that the critical behavior is governed by a new infinite randomness fixed point, with No-dqactivatedNo-dq scaling.