We model the newly predicted high-Tc superconducting candidates constructed by corner-shared trigonal bipyramidal complexes with an effective three-orbital tight-banding Hamiltonian and investigate the pairing symmetry of their superconducting states driven by electron-electron interactions. Our combined weak and strong coupling based calculations consistently identify the chiral d+id superconductivity as the leading pairing symmetry in a wide doping range with realistic interaction parameters. This pairing state has nontrivial topological Chern-number and can host gapless chiral edge modes, and the vortex cores under magnetic field can carry Majorana zero modes.
@article{arxiv.1801.02280,
title = {$d+id$ chiral superconductivity in a triangular lattice from trigonal bipyramidal complexes},
author = {Chen Lu and Li-Da Zhang and Xianxin Wu and Fan Yang and Jiangping Hu},
journal= {arXiv preprint arXiv:1801.02280},
year = {2018}
}