Surface density of states and topological edge states in non-centrosymmetric superconductors

2010/11/09 by Keiji Yada, Masatoshi Sato, Yukio Tanaka +1 · 1 citation
Physics and Astronomy · #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.83.064505

published as Phys. Rev. B 83, 064505 (2011) · 10 pages, 15 figures

arxiv created 2010/11/09 · arxiv updated 2011/07/05

Abstract

We study Andreev bound state (ABS) and surface density of state (SDOS) of non-centrosymmetric superconductor where spin-singlet d-wave pairing mixes with spin-triplet p (or f)-wave one by spin-orbit coupling. For d_xy + p-wave pairing, ABS appears as a zero energy state. The present ABS is a Majorana edge mode preserving the time reversal symmetry. We calculate topological invariant number and discuss the relevance to a single Majorana edge mode. In the presence of the Majorana edge mode, the SDOS depends strongly on the direction of the Zeeman field.

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