Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.51: Poster

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

Fano Resonances in Majorana Bound State - Quantum Dot Systems — •Alexander Schuray, Luzie Weithofer, and Patrik Recher — TU Braunschweig, Institute for Mathematical Physics, Braunschweig

Majorana bound states (MBS) have recieved a lot of attention in the last years and first experiments with nanowires in proximity to a superconductor [1] possibly present first experimental evidence for their existence.

Systems in which MBS are coupled via a quantum dot to normal leads are also gaining interest, as the parameters of the dot provide an interesting handle for transport signatures [2]. In contrast to previous studies, here we consider two MBS with non-zero overlap coupled to a lead on one side and a quantum dot on the other side. Using the Keldysh formalism we derive the cumulant generating function (CGF) for the tunnel currents in the leads [3]. We show that this setup exhibits a Fano-resonance which we interpret as resulting from interference of two different transport channels. Finally, we validate numerically that our result for this simple model is also applicable to a realistic setup of quantum wire and dot.
V. Mourik et al., Science 336, 1003 (2012).
G.-Y. Huang, M. Leijnse, K. Flensberg, H. Q. Xu,

PRB 90, 214507 (2014)
L. Weithofer, P. Recher, T. L. Schmidt, PRB 90, 205416 (2014)