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

Jing Wang, Quan Zhou, Biao Lian, Shou Cheng Zhang

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82 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number064520
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number6
DOIs
StatePublished - Aug 31 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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