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

    Aktivität: Präsentation oder VortragVortrag


    We solve the single-impurity Anderson model in a magnetic field and
    out of equilibrium with an auxiliary master equation approach [1,2].
    Employing Matrix Product States techniques to solve the many-body
    Lindblad equation allows us to generate highly accurate results, espe-
    cially for the spectral functions. In equilibrium we find a remarkable
    agreement with spectral functions obtained with NRG, cf. [2].
    The application of a bias voltage V and a magnetic field B both indi-
    vidually 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 conduc-
    tance, which is very well accessible by experiments.
    We investigate the stationary properties of the system as well as its
    dynamics after a quantum quench. We finally compare our results to
    recent experiments [3] and draw conclusions about the underlying spec-
    tral functions. We find that our results nicely agree with experimental
    data also outside the Kondo regime.

    [1] E. Arrigoni et al., PRL 110, 086403 (2013)
    [2] A. Dorda et al., PRB 92, 125145 (2015)
    [3] A. V. Kretinin et al., PRB 84, 245316 (2011)
    Zeitraum21 März 2017
    EreignistitelVerhandlungen der Deutschen Physikalischen Gesellschaft 2017
    OrtDresden, DeutschlandAuf Karte anzeigen