期刊
PHYSICAL REVIEW B
卷 87, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.140503
关键词
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资金
- Academy of Finland through its Centre of Excellence Program [250280, 251748]
- European Research Council [240362-Heattronics]
Surface superconductivity in rhombohedral graphite is a robust phenomenon which can exist even when higher order hoppings between the layers lift the topological protection of the surface flat band and introduce a quadratic dispersion of electrons with a heavy effective mass. We show that for weak pairing interaction, the flat-band character of the surface superconductivity transforms into a BCS-like relation with high critical temperature characterized by a higher coupling constant due to a much larger density of states than in the bulk. Our results offer an explanation for the recent findings of graphite superconductivity with an unusually high transition temperature. DOI: 10.1103/PhysRevB.87.140503
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