Evolution of Edge States and Critical Phenomena in the Rashba Superconductor with Magnetization

Ai Yamakage, Yukio Tanaka, and Naoto Nagaosa
Phys. Rev. Lett. 108, 087003 – Published 23 February 2012

Abstract

We study Andreev bound states (ABS) and the resulting charge transport of a Rashba superconductor (RSC) where two-dimensional semiconductor (2DSM) heterostructures are sandwiched by spin-singlet s-wave superconductor and ferromagnet insulator. ABS becomes a chiral Majorana edge mode in the topological phase (TP). We clarify two types of quantum criticality about the topological change of ABS near a quantum critical point (QCP), whether or not ABS exists at QCP. In the former type, ABS has an energy gap and does not cross at zero energy in the nontopological phase. These complex properties can be detected by tunneling conductance between normal metal-RSC junctions.

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  • Received 3 October 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.087003

© 2012 American Physical Society

Authors & Affiliations

Ai Yamakage1, Yukio Tanaka1, and Naoto Nagaosa2,3

  • 1Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan
  • 2Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 3Cross Correlated Materials Research Group (CMRG), ASI, RIKEN, WAKO 351-0198, Japan

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Issue

Vol. 108, Iss. 8 — 24 February 2012

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