2013/03/31 by Yuji Ueno, Ai Yamakage, Yukio Tanaka +1 · 1 citation
Physics and Astronomy · #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.111.087002
published as Phys. Rev. Lett. 111, 087002 (2013) · 6 pages, 2 figures (proper paper)+ 6 pages, 5 figures (supplemental material); final version accepted for publication in PRL
arxiv created 2013/07/26 · arxiv updated 2013/08/22
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.