High-temperature surface superconductivity in topological flat-band systems

N.B. Kopnin; T.T. Heikkilä; G.E. Volovik

doi:10.1103/PhysRevB.83.220503

High-temperature surface superconductivity in topological flat-band systems

N.B. Kopnin, T.T. Heikkilä, G.E. Volovik

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Abstract

We show that the topologically protected flat band emerging on a surface of a nodal fermionic system promotes the surface superconductivity due to an infinitely large density of states associated with the flat band. The critical temperature depends linearly on the pairing interaction and can be thus considerably higher than the exponentially small bulk critical temperature. We discuss an example of surface superconductivity in multilayered graphene with rhombohedral stacking.

Original language	English
Article number	220503
Pages (from-to)	1-4
Journal	Physical Review B
Volume	83
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.83.220503
Publication status	Published - 2011
MoE publication type	A1 Journal article-refereed

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PhysRevB.83.220503Final published version, 218 KB

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abstract = "We show that the topologically protected flat band emerging on a surface of a nodal fermionic system promotes the surface superconductivity due to an infinitely large density of states associated with the flat band. The critical temperature depends linearly on the pairing interaction and can be thus considerably higher than the exponentially small bulk critical temperature. We discuss an example of surface superconductivity in multilayered graphene with rhombohedral stacking.",

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AB - We show that the topologically protected flat band emerging on a surface of a nodal fermionic system promotes the surface superconductivity due to an infinitely large density of states associated with the flat band. The critical temperature depends linearly on the pairing interaction and can be thus considerably higher than the exponentially small bulk critical temperature. We discuss an example of surface superconductivity in multilayered graphene with rhombohedral stacking.

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DO - 10.1103/PhysRevB.83.220503

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High-temperature surface superconductivity in topological flat-band systems

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