Topological crystalline superconductivity and second-order topological superconductivity in nodal-loop materials
Topological crystalline superconductivity and second-order topological superconductivity in nodal-loop materials
We study the intrinsic fully gapped odd-parity superconducting order in doped nodal-loop materials with a torus-shaped Fermi surface. We show that the mirror symmetry, which protects the nodal loop in the normal state, also protects the superconducting state as a topological crystalline superconductor. As a result, the surfaces preserving the …