Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 37.8: Talk

Friday, February 29, 2008, 12:15–12:30, H 2053

Dephasing rates within nonequilibrium RG: A generic approach — •Frank Reininghaus, Herbert Schoeller, and Thomas Korb — Institut für Theoretische Physik A, RWTH Aachen, 52056 Aachen, Germany

We consider a generic model for a local quantum system coupled to reservoirs and present a general solution to the problem how relaxation and dephasing rates can be implemented within nonequilibrium renormalization group. Generalizing previous RG-methods [1,2] to a specific frequency representation and using a cutoff on the imaginary frequency axis [3], we show that decay rates always cut off the RG flow and find the physical meaning of these rates. We illustrate the method for the nonequilibrium Kondo model.
[1] Herbert Schoeller and Jürgen König, Phys. Rev. Lett. 84, 3686 (2000)
[2] Thomas Korb, Frank Reininghaus, Herbert Schoeller, and Jürgen König, Phys. Rev. B 76, 165316 (2007)
[3] Severin G. Jakobs, Volker Meden, and Herbert Schoeller, Phys. Rev. Lett. 99, 150603 (2007)