Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 1: Tutorial: Nonequilibrium Renormalization Group Methods

TT 1.3: Tutorium

Sonntag, 15. März 2015, 17:35–18:15, H 0110

Real-Time RG: Nonequilibrium Properties of Open Quantum Systems — •Herbert Schoeller — Institute for Theory of Statistical Physics, RWTH Aachen, 52056 Aachen, Germany — JARA-Fundamentals of Future Information Technology

A tutorial introduction is presented for the description of nonequilibrium properties of few-level quantum sytems coupled to reservoirs as e.g. realized by quantum dot, spin boson or Kondo models. Within a quantum field theoretical framework in Liouville space it is shown how formally exact kinetic equations can be derived which can be systematically studied in terms of an effective Liouvillian. By using special resummation techniques via self-consistent perturbation theory and renormalization group methods it is shown how the time evolution and the stationary state can be studied in a nonequilibrium set-up. Various applications in the weak and strong coupling limit are presented.