Topological surface states in nodal superconductors

TL;DR

This paper reviews recent theoretical advances in topological surface states of nodal superconductors, focusing on Weyl and noncentrosymmetric types, their properties, candidate materials, and experimental signatures.

Contribution

It provides a comprehensive overview of the topological characteristics and surface states in nodal superconductors, highlighting recent progress and potential experimental observations.

Findings

Identification of topological surface states in Weyl and noncentrosymmetric superconductors

Discussion of experimental signatures of topological surface states

Survey of candidate materials for topological superconductivity

Abstract

Topological superconductors have become a subject of intense research due to their potential use for technical applications in device fabrication and quantum information. Besides fully gapped superconductors, unconventional superconductors with point or line nodes in their order parameter can also exhibit nontrivial topological characteristics. This article reviews recent progress in the theoretical understanding of nodal topological superconductors, with a focus on Weyl and noncentrosymmetric superconductors and their protected surface states. Using selected examples, we review the bulk topological properties of these systems, study different types of topological surface states, and examine their unusual properties. Furthermore, we survey some candidate materials for topological superconductivity and discuss different experimental signatures of topological surface states.