Half-metallic Surface States and Topological Superconductivity in NaCoO$_2$ from first principles

Details Half-metallic Surface States and Topological Superconductivity in NaCoO$_2$ from first principles Half-metallic Surface States and Topological Superconductivity in NaCoO$_2$ from first principles

2011-03-10

arxiv.org/abs/1103.1930v2

Phys. Rev. B 84, 060408(R) (2011)

Physics

Condensed Matter

Materials Science

Published as Rapid Communications in Phys. Rev. B 84, 060408(R) (2011) [4 pages]

Scientific paper

10.1103/PhysRevB.84.060408

Based on first-principles calculations, we predict a half-metallic surface state in layered bulk insulator NaCoO2, with tunable surface hole concentration. The half-metallic surface has a single Fermi surface with a helical spin texture, similar to the surface state of topological insulators, but with the key difference of time-reversal symmetry breaking in the present case. We propose the realization of topological superconductivity and Majorana fermions when the half-metallic surface states are in proximity contact with a conventional superconductor.

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