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TT: Fachverband Tiefe Temperaturen

TT 30: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 30.4: Vortrag

Dienstag, 21. März 2017, 14:45–15:00, HSZ 03

Nonequilibrium Kondo effect in a magnetic field: Auxiliary master equation approach — •Delia Fugger¹, Frauke Schwarz², Antonius Dorda¹, Jan von Delft², Wolfgang von der Linden¹, and Enrico Arrigoni¹ — ¹Institute of Theoretical and Computational Physics, TU Graz, Austria — ²Faculty of Physics, LMU Munich, Germany

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, especially 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 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 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 spectral 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)