Controllable Majorana fermions on domain walls of a magnetic topological insulator

TL;DR

This paper proposes a method to realize controllable Majorana zero modes at magnetic domain walls in topological insulators coupled with superconductors, enabling reconfigurable quantum states for topological quantum computing.

Contribution

It introduces a novel approach to create and manipulate Majorana zero modes at magnetic domain walls in topological insulators with superconducting proximity effect.

Findings

Majorana zero modes can be localized at magnetic domain walls.

Reconfigurable control of Majorana modes via magnetic domain writing.

Potential extension to other topological superconducting systems.

Abstract

We propose to realize a one-dimensional chiral topological superconducting state at the magnetic domain walls stripe of a magnetic topological insulator coupled with a conventional $s$-wave superconductor. The localized Majorana zero modes can be constructed in a reconfigurable manner through magnetic domain writing by magnetic force microscopy. This proposal could be further extended to the Majorana zero modes at domain walls on superconducting spin-helical Dirac surface states, and may be applicable to the two-dimensional time-reversal invariant topological superconductor on FeTe$_{0.5}$Se$_{0.5}$ surface.