Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Poster Session Transport & Matter at Low Temperature

TT 58.47: Poster

Donnerstag, 14. März 2013, 15:00–19:00, Poster D

Majorana single-charge transistor — •Roland Hützen¹, Alex Zazunov¹, Bernd Braunecker², Alfredo Levy Yeyati², and Reinhold Egger¹ — ¹Institut für Theoretische Physik, Heinrich-Heine-Universität, D-40225 Düsseldorf, Germany — ²Departamento de Física Teórica de la Materia Condensada C-V and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain

We study transport through a Coulomb blockaded topologically nontrivial superconducting wire (with Majorana end states) contacted by metallic leads. An exact formula for the current through this interacting Majorana single-charge transistor is derived in terms of wire spectral functions. A comprehensive picture follows from three different approaches. We find Coulomb oscillations with universal halving of the finite-temperature peak conductance under strong blockade conditions, where the valley conductance mainly comes from elastic cotunneling. The nonlinear conductance exhibits finite-voltage sidebands due to anomalous tunneling involving Cooper pair splitting.