title: Topological Crystalline Superconductivity in Locally Noncentrosymmetric Multilayer Superconductors.
abstract: Topological crystalline superconductivity in locally noncentrosymmetric multilayer superconductors (SCs) is proposed. We study the odd-parity pair-density wave (PDW) state induced by the spin-singlet pairing interaction through the spin-orbit coupling. It is shown that the PDW state is a topological crystalline SC protected by a mirror symmetry, although it is topologically trivial according to the classification based on the standard topological periodic table. The topological property of the mirror subsectors is intuitively explained by adiabatically changing the Bogoliubov-de Gennes Hamiltonian. A subsector of the bilayer PDW state reduces to the two-dimensional noncentrosymmetric SC, while a subsector of the trilayer PDW state is topologically equivalent to the spinless p-wave SC. Chiral Majorana edge modes in trilayers can be realized without Cooper pairs in the spin-triplet channel and chemical potential tuning.
authors.affiliation: Department of Physics, Niigata University, Niigata 950-2181, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Yoshida
authors.affiliation: Theoretische Physik, ETH-Zürich, 8093 Zürich, Switzerland.
authors.forename: Manfred
authors.initials: M
authors.lastname: Sigrist
authors.affiliation: Department of Physics, Niigata University, Niigata 950-2181, Japan.
authors.forename: Youichi
authors.initials: Y
authors.lastname: Yanase