title: Symmetry-protected Majorana fermions in topological crystalline superconductors: theory and application to Sr2RuO4.
abstract: Crystal point group symmetry is shown to protect Majorana fermions (MFs) in spinfull superconductors (SCs). We elucidate the condition necessary to obtain MFs protected by the point group symmetry. We argue that superconductivity in Sr2RuO4 hosts a topological phase transition to a topological crystalline SC, which accompanies a d-vector rotation under a magnetic field along the c axis. Taking all three bands and spin-orbit interactions into account, symmetry-protected MFs in the topological crystalline SC are identified. Detection of such MFs provides evidence of the d-vector rotation in Sr2RuO4 expected from Knight shift measurements but not yet verified.
authors.affiliation: Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ueno
authors.forename: Ai
authors.initials: A
authors.lastname: Yamakage
authors.forename: Yukio
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Sato