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TT: Fachverband Tiefe Temperaturen

TT 15: Correlated Electrons: Quantum Impurities, Kondo Physics 1

TT 15.1: Vortrag

Montag, 26. März 2012, 16:45–17:00, BH 334

Two-electron transfer dynamics in a donor-acceptor system coupled to a dissipative bosonic bath — •Christian Kleine and Frithjof B. Anders — Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44221 Dortmund, Germany

We model a donor-acceptor (DA) system coupled to a dissipative bosonic bath which is motivated by electron charge transfer within a DNA base pair. Using the time-dependent numerical renormalization-group (TD-NRG) we study the time-dependent electron dynamics in the DA system where two excess charges are initially localised on the donor. We consider the influence of the coupling strength of the DA system to the bosonic bath on the thermalisation. Additionally we introduce a finite bias between the donor and acceptor level and investigate the crossover between the two different regimes where the charge transfer is dominated by sequential or pairwise electron hopping.