Topological superconductivity in Rashba semiconductors without a Zeeman field

Panagiotis Kotetes

Published 2014-09-18Version 1

In this manuscript I present new hybrid devices based on multi-wire/channel Rashba semiconductors, which harbor Majorana fermions (MFs) without a Zeeman field. In contrast, magnetic fluxes, supercurrents or electric fields can be employed, yielding an enhanced device manipulability. The generic topological phase diagram for two-nanowire/channel systems, 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.