Symmetry and topology are fundamental properties of systems. In particular, the space inversion parity often plays an essential role for emergent phenomena in quantum phases. Historically, superconductors have been classified based on the space inversion parity, as spin-singlet (spin-triplet) Cooper pairs lead to the even-parity (odd-parity) superconductivity in the usual setup. The parity gives rise to a strong constraint on the topology, and odd-parity superconductors are promising candidates for the topological superconductivity. In the talk, I will present our studies on recently discovered superconductors UTe2 and CeRh2As2. Parity violation in UTe2 is shown by the analysis of an effective 24 band model, and parity transition in the superconducting phases of CeRh2As2 is discussed with focusing on the locally noncentrosymmetric crystal structure. Topological superconductivity is predicted in both UTe2 and CeRh2As2 based on first-principles band calculations.

Chair: Masaki Oshikawa

This event is jointly organized by the Korea Institute for Advanced Study and the University of Tokyo. “Correlated Electrons Virtual International Seminars (CEVIS)”　https://sites.google.com/view/cevis2020/home