In magnetically doped thin-film topological insulators, aligning the magnetic moments generates a quantum anomalous Hall phase supporting a single chiral edge state. We show that as the system de-magnetizes, disorder from randomly oriented magnetic moments can produce a `quantum anomalous parity Hall' phase with \emph{helical} edge modes protected by a unitary reflection symmetry. We further show that introducing superconductivity, combined with selective breaking of reflection symmetry by a gate, allows for creation and manipulation of Majorana zero modes via purely electrical means and at zero applied magnetic field.
@article{arxiv.1903.05089,
title = {Quantum Anomalous Parity Hall Effect in Magnetically Disordered Topological Insulator Films},
author = {Arbel Haim and Roni Ilan and Jason Alicea},
journal= {arXiv preprint arXiv:1903.05089},
year = {2019}
}
Comments
Published version, 5 pages + Supplemental Material