title: Topological superconductivity in monolayer transition metal dichalcogenides.
abstract: Theoretically, it has been known that breaking spin degeneracy and effectively realizing spinless fermions is a promising path to topological superconductors. Yet, topological superconductors are rare to date. Here we propose to realize spinless fermions by splitting the spin degeneracy in momentum space. Specifically, we identify monolayer hole-doped transition metal dichalcogenide (TMD)s as candidates for topological superconductors out of such momentum-space-split spinless fermions. Although electron-doped TMDs have recently been found superconducting, the observed superconductivity is unlikely topological because of the near spin degeneracy. Meanwhile, hole-doped TMDs with momentum-space-split spinless fermions remain unexplored. Employing a renormalization group analysis, we propose that the unusual spin-valley locking in hole-doped TMDs together with repulsive interactions selectively favours two topological superconducting states: interpocket paired state with Chern number 2 and intrapocket paired state with finite pair momentum. A confirmation of our predictions will open up possibilities for manipulating topological superconductors on the device-friendly platform of monolayer TMDs.
authors.affiliation: Department of Physics, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Yi-Ting
authors.initials: YT
authors.lastname: Hsu
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305-4060, USA.
authors.forename: Abolhassan
authors.initials: A
authors.lastname: Vaezi
authors.affiliation: Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.
authors.forename: Mark H
authors.initials: MH
authors.lastname: Fischer
authors.affiliation: Department of Physics, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Eun-Ah
authors.identifier: 0000-0002-9554-4443
authors.initials: EA
authors.lastname: Kim