Year: 2016
Type: article
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 ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$-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 ${\mathrm{CeRhSi}}_{3}$ and ${\mathrm{CeIrSi}}_{3}$, are candidates for Weyl SCs.
Authors: Tomohiro Yoshida, Youichi Yanase
Institutions: Gakushuin University, Kyoto University
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: 局所的な空間反転対称性が破れた系における新奇量子相の探索, G2369834278, Magnetism, multipole order, and superconductivity in locally noncentrosymmetric crystals, Understanding of the Mechanism of Superconductivity and Search for a Novel Superconducting State in Uranium Heavy-Fermion Compounds, Study of exotic superconductivity by combining microscopic theory and phenomenological theory
OpenAlex ID: W2503478712