Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Poster Session: Transport

TT 99.29: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Influence of the spin-polarized charge transport on the waiting time distribution in ferromagnet-quantum dot-superconductor systems — •Kacper Bocian and Ireneusz Weymann — Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

Based on the Markovian quantum master equation for the reduced density matrix we investigate the waiting time distribution of a single-level quantum dot (QD) system tunnel-coupled to the ferromagnetic (F) and/or superconducting (S) leads. Waiting times describe the delay times between the consecutive tunnelling events and carry the information about their dynamics. We compare the distributions of waiting times in different setups: F-QD-F, F-QD-S, and in the Cooper pair splitter geometry with two F and one S leads. By changing the spin-polarization of the ferromagnetic leads, the transition probabilities, and hence the waiting times, become modified. In the limiting case of the half-metallic leads all transitions can be blocked. We discuss the influence of presence of the superconductor on the waiting times and indicate the features of Cooper pair tunnelling. Furthermore, we analyze the impact of asymmetry of the couplings between the quantum dot and the external leads.

This work is supported by the National Science Centre in Poland as the Project No. DEC-2013/10/E/ST3/00213.