Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Topology: Poster Session

TT 20.11: Poster

Mittwoch, 7. September 2022, 15:00–18:00, P1

Full counting statistics of electron transport through a Majorana single-charge transistor — •Eric Kleinherbers, Alexander Schünemann, and Jürgen König — Faculty of Physics and CENIDE, University Duisburg-Essen, 47057 Duisburg, Germany

We study full counting statistics of electron transport through a Majorana single-charge transistor (MSCT) [1]. The MSCT can host both Majorana bound states and Cooper pairs. In addition, the system is coupled to a superconducting and a metallic lead. A current through the system is realized by means of the Josephson-Majorana cycle [2], where sequential tunneling (normal and anomalous) of two electrons into the system is followed by the transfer of a Cooper pair into the superconductor. We find a highly correlated electron transfer which can be indicated by a sign violation of factorial cumulants. Moreover, when the superconductor is only weakly coupled to the MSCT, we find for large bias voltages a strong suppression of the electron current. This effect is explained by the excitation of a dark state that effectively decouples from the leads.

[1] A. Zazunov et al., Phys. Rev. B 84, 165440 (2011)

[2] N. Didier et al., Phys. Rev. B 88, 024512 (2013)