Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 105: Transport: Majorana fermions (TT with DS/HL/MA/O)

HL 105.8: Talk

Friday, March 20, 2015, 11:30–11:45, H 0104

Topological superconductivity in Rashba semiconductors without a Zeeman field — •Panagiotis Kotetes — Karlsruhe Institute of Technology

I propose new hybrid devices based on multichannel Rashba semiconductors, which harbor Majorana fermions (MFs) without a Zeeman field [1]. In contrast, magnetic fluxes, supercurrents or electric fields can be employed, yielding an enhanced device manipulability. The generic topological phase diagram exhibits features of quantum criticality and a rich interplay of phases with 0, 1 or 2 MFs per edge. The most prominent and experimentally feasible implementation, relies on the already existing platforms of InAs-2DEG on top of a Josephson junction. Appropriate design of the latter device, allows phases with 1 or 2 MFs, both detectable in zero-bias anomaly peaks with a single or double unit of conductance. The absence of the Zeeman field in these devices could be assisting for a Kondo-peak-free interpretation of the expected MF signatures.

[1] P. Kotetes, arXiv:1409.5264.