Journal
PHYSICAL REVIEW B
Volume 84, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.020501
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Nodal noncentrosymmetric superconductors (NCS) have recently been shown to be topologically nontrivial. 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 [A. P. Schnyder and S. Ryu, arXiv:1011.1438]. In this Rapid Communication, 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 nontrivial NCS.
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