Kondo effect in the single-impurity Anderson model out of equilibrium
Delia Fugger
Institute of Theoretical and Computational Physics
15:50 - 16:30 Friday 10 May 2019 KFU HS 05.12

The single-impurity Anderson model can be used to describe the Coulomb blockade and Kondo effect in quantum dots and nanostructures. We solve this model in as well as out of equilibrium and in an additional magnetic field with an auxiliary master equation approach [1,2,3]. This approach allows us to generate highly accurate results, especially for the spectral functions. In equilibrium, we find a remarkable agreement with spectral functions obtained with NRG, cf. [2,3]. The application of a bias voltage V and a magnetic field B both individually result in a splitting of the Kondo resonance around the Kondo temperature. With our method we can resolve a four-peak structure in the spectral function for nonzero B and V, due to both effects [3]. This four-peak structure manifests itself in the differential conductance, which is very well accessible by experiments. We finally compare our results to recent experiments [4] and find a nice agreement also outside the Kondo regime.

[1] E. Arrigoni et al., Phys. Rev. Lett. 110, 086403 (2013)
[2] A. Dorda et al., Phys. Rev. B 89, 165105 (2014); Phys. Rev. B 92, 125145 (2015)
[3] D. M. Fugger et al., N. J. Phys. 20, 013030 (2018)
[4] A. V. Kretinin et al., Phys. Rev. B 84, 245316 (2011); Phys. Rev. B 85, 201301(R) (2012)