Quantum anomalous parity Hall effect in magnetically disordered topological insulator films

Creators: Haim, Arbel; Ilan, Roni; Alicea, Jason

Abstract

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 demagnetizes, disorder from randomly oriented magnetic moments can produce a "quantum anomalous parity Hall" phase with 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.

Additional Information

© 2019 American Physical Society. Received 21 March 2019; published 22 July 2019. We thank A. Thomson for her insightful comments. We acknowledge support from the Army Research Office under Grant Award No. W911NF-17-1-0323 (J. A.), the NSF through Grant No. DMR-1723367 (J. A.), the Caltech Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant No. GBMF1250 (J. A.), and the Walter Burke Institute for Theoretical Physics at Caltech (J. A. and A. H.).

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Published - PhysRevLett.123.046801.pdf

Submitted - 1903.05089.pdf

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