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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.34: Poster

Thursday, March 29, 2012, 15:00–19:00, Poster B

Effects of dissipation on the phase transition of the disordered O(2) quantum rotor model — •Nicolas Lorscheid and Heiko Rieger — Universität des Saarlandes

Properties of Josephson arrays are conventionally described using the O(2) quantum rotor Hamiltonian. The properties of the occuring quantum phase transition suggest, that the model belongs to the Kosterlitz-Thouless universality class. In order to study the effects of dissipation on this transition, the system is coupled to a dissipative bath of harmonic oscillators. We study the model using an efficient numerical implementation of the real space renormalization group approach, which makes it possible to treat large systems.