Stefan Kirchner, MPI-PKS Dresden
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[4]. The steady-state properties of scale-invariant systems are distinctively different from those of Refs.[1,2]. I'll briefly discuss the far-from-equilibrium properties of a quantum critical system displaying critical Kondo breakdown and the notion of effective temperatures[5,6].
[1] M. Grobis et al., PRL (2008).
[2] G. D. Scott et al., PRB (2009).
[3] H. Hafermann et al., EPL (2009).
[4] E. Munoz, C. Bolech, & S. Kirchner, PRL (2013)
[5] S. Kirchner & Q. Si, PRL (2009)
[6] P. Ribeiro, Q. Si, & S. Kirchner, arXiv:1303.2518 (2013)