The monolayer FeSe with a thickness of one unit cell grown on a single-crystal SrTiO3 substrate (FeSe/STO) exhibits striking high-temperature superconductivity with transition temperature Tc over 65K reported by recent experimental measurements. In this work, through analyzing the distinctive electronic structure, and providing systematic classification of the pairing symmetry , we find that both s-and p-wave pairing with odd parity give rise to topological superconducting states in monolayer FeSe, and the exotic properties of s-wave topological superconducting states have close relations with the unique non-symmorphic lattice structure which induces the orbital-momentum locking. Our results indicate that the monolayer FeSe could be in the topological nontrivial s-wave superconducting states if the relevant effective pairing interactions are dominant in comparison with other candidates.
@article{arxiv.1506.07345,
title = {Topological superconducting states in monolayer FeSe/SrTiO$_{3}$},
author = {Ningning Hao and Shun-Qing Shen},
journal= {arXiv preprint arXiv:1506.07345},
year = {2015}
}