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 Bolech4 — 1Max 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).