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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: Correlated Electrons: Quantum Impurities, Kondo Physics 2

TT 18.11: Talk

Tuesday, March 27, 2012, 12:15–12:30, H 3005

Universal out-of-equilibrium transport in Kondo-correlated quantum dots: a renormalized superperturbation theory on the Keldysh contour — •Stefan Kirchner1,2, Enrique Munoz3, and Carlos Bolech41Max Planck Institute for the Physics of Complex Systems — 2Max Planck Institute for Chemical Physics of Solids — 3Pontificia Universidad Catolica de Valparaiso, Chile — 4University of Cincinnati, US

The non-linear conductance of semiconductor heterostructures and single molecule devices exhibiting Kondo physics has recently attracted attention[1,2]. We address the observed sample-dependence across various systems by considering additional electronic contributions present in the effective low-energy model underlying these experiments. To this end we develop a novel version of the superperturbation theory [3] in terms of dual fermions on the Keldysh contour. We analyze the role of particle hole asymmetry on the transport coefficients. Our approach systematically extends the work of Yamada and Yosida and others to the particle-hole asymmetric Anderson model and reproduce the exactly solvable resonant level model and the special case considered in [4]. It correctly describes the strong coupling physics and is free of internal inconsistencies that would lead to a breakdown of current conservation.
M. Grobis et al., Phys. Rev. Lett. 100, 246601 (2008).
G. D. Scott et al., Phys. Rev. B 79, 165413 (2009).
H. Hafermann et al., EPL 85, 27007 (2009).
K. Yamada, Prog. Theo. Phys. 62, 354 (1979).

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