Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Quantum Dots, Quantum Wires, Point Contacts

TT 22.10: Vortrag

Dienstag, 17. März 2020, 12:00–12:15, HSZ 201

Waiting time distribution and current cross-correlations in triple quantum dot-based Cooper pair splitters — •Kacper Wrześniewski and Ireneusz Weymann — Faculty of Physics, Adam Mickiewicz University in Poznań, Poland

We study the spin-resolved subgap transport in a triple quantum-dot system coupled to one superconducting and two ferromagnetic leads. The Andreev processes are examined in the parallel and antiparallel alignments of ferromagnets' magnetic moments in both linear and nonlinear response regimes. The emphasis is put on the analysis of the electron waiting time distributions and cross-correlations between the currents flowing through the left and right arms of the device. In particular, we consider various detuning schemes of the quantum dots' energy levels and find the optimal parameters for the efficient splitting and maximized Andreev current. We predict short waiting times for electrons tunneling through the distinct ferromagnetic contacts indicating fast splitting of emitted Cooper pairs and strong positive cross-correlations associated with the presence of tunneling processes enhancing the Cooper pair splitting efficiency.