Nonequilibrium Kondo effect in a magnetic field: Auxiliary master equation approach

    Activity: Talk or presentationOral presentation

    Description

    We solve the single-impurity Anderson model in a magnetic field and out of equilibrium with an auxiliary master equation approach [1,2,3]. Treating the master equation within the framework of matrix product states allows us to generate highly accurate results, especially for the spectral functions. In equilibrium we find a remarkable agreement to spectral functions achieved with NRG, cf. [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. 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 [4,5,6] and draw conclusions about the underlying spectral functions. We find that our results nicely agree with experimental data 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)
    [3] A. Dorda et al., Phys. Rev. B 92, 125145 (2015)
    [4] A. V. Kretinin et al., Phys. Rev. B 84, 245316 (2011)
    [5] A. V. Kretinin et al., Phys. Rev. B 85, 201301(R) (2012)
    [6] M. Ferrier et al., Nat. Phys. 12, 230 (2016)
    Period13 Oct 2016
    Event titleXX Training Course in the Physics of Strongly Correlated Systems
    Event typeCourse
    LocationVietri sul Mare, ItalyShow on map
    Degree of RecognitionInternational