Topological D+p-wave superconductivity in Rashba systems
Abstract
We show two-dimensional "strong" topological superconductivity in d-wave superconductors (SCs). Although the topological invariant of the bulk wave function cannot be defined in d_{x^2-y^2}-wave and d_{xy}-wave SCs because of nodal excitations, the bulk energy spectrum of d-wave SCs on a substrate is fully gapped in a magnetic field. Then the superconducting state is specified by a nontrivial Chern number, and hence topologically nontrivial properties are robust against disorders and interactions. We discuss high-temperature topological superconductivity in cuprate SCs recently fabricated on a substrate. Furthermore, we show that the three-dimensional noncentrosymmetric d-wave SC is a Weyl SC hosting topologically protected Weyl nodes. Noncentrosymmetric heavy-fermion SCs, such as CeRhSi_3 and CeIrSi_3, are candidates for Weyl SCs.
Keywords
Cite
@article{arxiv.1602.05340,
title = {Topological D+p-wave superconductivity in Rashba systems},
author = {Tomohiro Yoshida and Youichi Yanase},
journal= {arXiv preprint arXiv:1602.05340},
year = {2016}
}