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arXiv · 1110.0358

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

Ai Yamakage·Yukio Tanaka·Naoto Nagaosa
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Abstract

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

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Ai Yamakage, Yukio Tanaka, Naoto Nagaosa. 2012-01-07. Evolution of Edge States and Critical Phenomena in the Rashba Superconductor with Magnetization. https://doi.org/10.1103/physrevlett.108.087003

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