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

Fugger, D. M. (Speaker), Frauke Schwarz (Contributor), Antonius Dorda (Contributor), Jan von Delft (Contributor), von der Linden, W. (Contributor), Arrigoni, E. (Contributor)

Activity: Talk or presentationTalk at conference or symposiumScience to science

Description

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)
Period21 Mar 2017
Held atVerhandlungen der Deutschen Physikalischen Gesellschaft 2017
Event typeConference
LocationDresden, Germany

Keywords

  • Physics and Astronomy(all)
  • Advanced Materials Science