Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.3: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Transient dynamics in electron transport through an Anderson impurity: A hierarchical quantum master equation approach — •Jakob Bätge, Sebastian Wenderoth, and Rainer Härtle — Institut für theoretische Physik, Georg-August-Universität Göttingen

We investigate the transport properties of an Anderson impurity under the influence of time-dependent electric fields. This includes the transient dynamics starting from product and correlated initial states and the response to voltage pulses, as they are used, for example, in pump-probe experiments. Our study is based on the quantum master equation methodology, where, in particular, we present an extension of the recently developed hierarchical quantum master equation approach [1] to time-dependent problems. The approach is time-local and numerically exact, as was corroborated recently for a time-independent problem by a direct comparison to quantum Monte Carlo simulations [2]. Thus, we have access to a systematic and controlled protocol to simulate long-lived correlated dynamics [3]. Here, we use this method to calculate the magnetization and the electrical current that is flowing through the impurity as a function of time, elucidating the role of resonant, non-resonant and higher-order processes.
R. Härtle et al., PRB 88, 235426 (2013)
R. Härtle et al., PRB 92, 085430 (2015)
R. Härtle et al., PRB 90, 245426 (2014)