P. M. R. Brydon, Andreas P. Schnyder, Carsten Timm. Topologically protected flat zero-energy surface bands in non-centrosymmetric superconductors
Submitted on: Sep 07, 2012, 07:13:14
Natural Sciences / Physics / Condensed Matter Physics
Description: Nodal non-centrosymmetric superconductors (NCS) have recently been shown to be topologically non-trivial. An important consequence is the existence of topologically protected flat zero-energy surface bands, which are related to the topological characteristics of the line nodes of the bulk gap via a bulk-boundary correspondence. In this paper we examine these zero-energy surface bands using a quasiclassical theory. We determine their spectrum and derive a general condition for their existence in terms of the sign change of the gap functions. A key experimental signature of the zero-energy surface bands is a zero-bias peak in the tunneling conductance, which depends strongly on the surface orientation. This can be used as a fingerprint of a topologically non-trivial NCS.
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