Spin-triplet superconductivity is known to be a rare quantum phenomenon. Here we show that nonsymmorphic crystalline symmetries can dramatically assist spin-triplet superconductivity in the presence of spin-orbit coupling. Even with a weak spin-orbit coupling, the spin-triplet pairing can be the leading pairing instability in a lattice with a nonsymmorphic symmetry. The underlining mechanism is the spin-sublattice-momentum lock on electronic bands that are protected by the nonsymmorphic symmetry. We use the nonsymmorphic space group P4/nmm to demonstrate these results and discuss related experimental observables. Our work paves a new way in searching for spin-triplet superconductivity.
@article{arxiv.2208.09409,
title = {Spin-triplet Superconductivity in Nonsymmorphic crystals},
author = {Shengshan Qin and Chen Fang and Fu-chun Zhang and Jiangping Hu},
journal= {arXiv preprint arXiv:2208.09409},
year = {2022}
}