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Title: Chiral topological superconductor and half-integer conductance plateau from quantum anomalous Hall plateau transition

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [2];  [1]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Stanford Univ., Stanford, CA (United States)

Here, we propose to realize a two-dimensional chiral topological superconducting (TSC) state from the quantum anomalous Hall plateau transition in a magnetic topological insulator thin film through the proximity effect to a conventional s -wave superconductor. This state has a full pairing gap in the bulk and a single chiral Majorana mode at the edge. The optimal condition for realizing such chiral TSC is to have inequivalent superconducting pairing amplitudes on top and bottom surfaces of the doped magnetic topological insulator. We further propose several transport experiments to detect the chiral TSC. One unique signature is that the conductance will be quantized into a half-integer plateau at the coercive field in this hybrid system. In particular, with the point contact formed by a superconducting junction, the conductance oscillates between e2 /2h and e2 /h with the frequency determined by the voltage across the junction. We close by discussing the feasibility of these experimental proposals.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1326857
Alternate ID(s):
OSTI ID: 1213610
Report Number(s):
SLAC-PUB-16713; PRBMDO
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 6; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 132 works
Citation information provided by
Web of Science

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Cited By (23)

Superconductivity in Doped Quantum Anomalous Hall Insulators journal September 2018
Topological states of condensed matter journal October 2017
Pressure-induced superconductivity in topological semimetal NbAs2 journal November 2018
Platform of chiral Majorana edge modes and its quantum transport phenomena journal November 2019
Magnetic topological insulators journal January 2019
Magnetic orbital motion and 0.5 e 2 / h conductance of quantum-anomalous-Hall hybrid strips journal April 2019
Topological quantum computation based on chiral Majorana fermions journal October 2018
Visualization of an axion insulating state at the transition between 2 chiral quantum anomalous Hall states journal July 2019
Spectroscopic fingerprint of chiral Majorana modes at the edge of a quantum anomalous Hall insulator/superconductor heterostructure journal December 2019
Spin dependence of crossed Andreev reflection and electron tunneling induced by Majorana fermions journal November 2018
In-plane magnetic-field-induced quantum anomalous Hall plateau transition journal October 2019
Protected gap closing in Josephson trijunctions constructed on Bi 2 Te 3 journal November 2019
Electrically tunable chiral Majorana edge modes in quantum anomalous Hall insulator–topological superconductor systems journal December 2019
Majorana zero modes in regular B-form single-stranded DNA proximity-coupled to an s -wave superconductor journal June 2019
Exact solution to the Haldane-BCS-Hubbard model along the symmetric lines: Interaction-induced topological phase transition journal June 2019
Topological π Junctions from Crossed Andreev Reflection in the Quantum Hall Regime journal March 2018
Splitting the Hinge Mode of Higher-Order Topological Insulators journal July 2019
Chiral Majorana fermion modes in a quantum anomalous Hall insulator–superconductor structure journal July 2017
Absence of evidence for chiral Majorana modes in quantum anomalous Hall-superconductor devices journal January 2020
Complex band-structure analysis and topological physics of Majorana nanowires journal May 2019
Circular dichroism of chiral Majorana states journal January 2018
Multiple types of topological fermions in transition metal silicides text January 2017
Spectroscopic Fingerprint of Chiral Majorana Modes at the Edge of a Quantum Anomalous Hall Insulator / Superconductor Heterostructure text January 2018

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