期刊
PHYSICAL REVIEW B
卷 92, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.174503
关键词
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资金
- NSFC [11374175, 11174171, 11474175, 11174337, 11225418, 11274041, 11334012]
- National Thousand-Young-Talent Program of China
- MOST Project of China [2014CB920903]
- NCET program [NCET-12-0038]
We theoretically study exotic superconducting phases in graphene-like single-sheet material BC3 doped to its type-II van Hove singularity whose saddle-point momenta are not time-reversal invariant. From combined renormalization group analysis and random-phase approximation calculations, we show that the dominant superconducting instability induced by weak repulsive interactions is in the time-reversal-invariant p + ip pairing channel because of the interplay among dominant ferromagnetic fluctuations, subleading spin fluctuations at finite momentum, and spin-orbit coupling. Such time-reversal-invariant p + ip superconductivity has nontrivial Z(2) topological invariant. Our results show that doped BC3 provides a promising route to realizing a genuine two-dimensional helical p + ip superconductor.
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