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TT: Fachverband Tiefe Temperaturen
TT 9: Transport: Quantum Dots, Quantum Wires, Point Contacts I (organized by TT)
TT 9.4: Vortrag
Montag, 31. März 2014, 10:15–10:30, BEY 81
Non perturbative approach to transport through Anderson quantum dot: the influence of charge fluctuations — •Davide Mantelli and Milena Grifoni — Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Deutschland
Transport through a strongly interacting Anderson quantum dot is analyzed for tunneling couplings Γ comparable or larger than the thermal energy kBT. In this regime the commonly used sequential tunneling approximation, where tunneling rates are calculated to the lowest order in Γ, breaks down. By accounting for charge fluctuations accompanying the transfer of one electron onto the dot, “dressed” tunneling rates and the associated current across the dot can be calculated [1]. The difference between the standard lowest order theory and the “dressed” one is carefully analyzed in the weak (Γ≪ kBT), intermediate (Γ≃ kBT) and strong (Γ≫ kBT) coupling regimes. At low temperatures features typical of the Kondo resonance are recovered.
[1] J. Kern and M. Grifoni, Eur. Phys. J. B 86, (2013) 384