Majorana states and devices in magnetic structures

TL;DR

This paper proposes a novel, scalable method for creating Majorana fermion devices using curved semiconductor wires near superconductors and nanomagnets, enabling new device architectures without the need for strong spin-orbit coupling or magnetic fields.

Contribution

It introduces a new fabrication approach for Majorana devices utilizing curved wires and nanomagnets, expanding possibilities beyond traditional straight wire methods.

Findings

Feasible fabrication of Majorana Josephson devices without magnetic fields

Scalable method allowing array creation of Majorana states

Potential for systematic Majorana device engineering

Abstract

The pursuit for Majorana fermions is one of the top priorities in condensed matter physics at the moment. In this work we propose a new method of fabricating Majorana Josephson devices in systems with a weak or no spin-orbit coupling and without external magnetic fields. Our proposal is based on curved semiconductor wires in the proximity of superconducting elements and a small number of nanomagnets. With this method it is possible to fabricate devices that are not feasible by employing straight topological wire segments. The proposed method is naturally scalable and opens up a possibility for a systematic fabrication of arrays of Majorana states where a pair of Majorana states is obtained from a single magnet.