title: Majorana fermions in spin-singlet nodal superconductors with coexisting noncollinear magnetic order.
abstract: Realizations of Majorana fermions in solid state materials have attracted great interest recently in connection to topological order and quantum information processing. We propose a novel way to create Majorana fermions in superconductors. We show that an incipient noncollinear magnetic order turns a spin-singlet superconductor with nodes into a topological superconductor with a stable Majorana bound state in the vortex core, at a topologically stable magnetic point defect, and on the edge. We argue that such an exotic non-Abelian phase can be realized in extended t-J models on the triangular and square lattices. It is promising to search for Majorana fermions in correlated electron materials where nodal superconductivity and magnetism are two common caricatures.
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: Yuan-Ming
authors.initials: YM
authors.lastname: Lu
authors.forename: Ziqiang
authors.initials: Z
authors.lastname: Wang