Possible chiral topological superconductivity in CrO2 bilayers
Xu Dou, Kangjun Seo, Bruno Uchoa
DOI 10.1103/PhysRevB.99.104503 · Physical Review B
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Abstract
We address the possible emergence of spin triplet superconductivity in CrO2 bilayers, which are half-metals with fully spin-polarized conducting bands. Starting from a lattice model, we show that chiral p+ip states compete with nonchiral p-wave ones. At large doping, the p+ip channel has a sequence of topological phase transitions that can be tuned by gating effects and interaction strength. Among several phases, we find chiral topological phases having a single Majorana mode at the edge. We show that different topological superconducting phases could spontaneously emerge in the vicinity of the van Hove singularities of the band.
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