Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 75: Poster Session: Transport 1

TT 75.6: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-EG

Switching the electrical conductance of double quantum dot and quantum dot spin valve systems exploiting exchange interactions — •Sebastian Wenderoth and Rainer Härtle — Institut für Theoretische Physik, Georg-August-Universität Göttingen, Germany

Recently, sharp peaks in the conductance of double quantum dot and quantum dot spin valve systems have been reported [1,2,3]. Their origin has been traced back to the effect of interaction-induced renormalization [1,3] and coupling effects [2]. In this contribution, we investigate the possible use of the underlying phenomena to realize switching processes in electronic device applications by simple gate voltage operations. This includes a discussion of switching times, switching efficiencies, the underlying physical mechanisms and parameter dependencies. To this end, we employ the hierarchical quantum master equation approach, which allows us to obtain numerically converged, exact results as well as approximate results in terms of a hybridization expansion [1,3]. In particular, its time-local formulation allows us to study the switching behavior to all relevant time scales. We find that many-body interactions enhance the switching efficiency but also the switching times by an order of magnitude.

[1] Härtle et al., PRB 88, 235426 (2013)

[2] Hell et al., PRB 91, 195404 (2015)

[3] Wenderoth et al., PRB 94, 121303R (2016)