Observation of Interface Superconductivity in a SnSe2-Epitaxial Graphene van der Waals Heterostructure

Yi-Min Zhang; Jia-Qi Fan; Wen-Lin Wang; Ding Zhang; Lili Wang; Wei Li; Ke He; Can-Li Song; Xu-Cun Ma; Qi-Kun Xue

doi:10.1103/PhysRevB.98.220508

Observation of Interface Superconductivity in a SnSe2-Epitaxial Graphene van der Waals Heterostructure

Superconductivity 2018-12-26 v1 Materials Science

Authors: Yi-Min Zhang , Jia-Qi Fan , Wen-Lin Wang , Ding Zhang , Lili Wang , Wei Li , Ke He , Can-Li Song , Xu-Cun Ma , Qi-Kun Xue

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Abstract

We report on the direct observation of interface superconductivity in single-unit-cell SnSe2 films grown on graphitized SiC(0001) substrate by means of van der Waals epitaxy. Tunneling spectrum in the superconducting state reveals rather conventional character with a fully gapped order parameter. The occurrence of superconductivity is further confirmed by the presence of vortices under external magnetic field. Through interface engineering, we unravel the mechanism of superconductivity that originates from a two-dimensional electron gas formed at the interface of SnSe2 and graphene. Our finding opens up novel strategies to hunt for and understand interface superconductivity based on van der Waals heterostructures.

Keywords

interface superconductivity snse2 epitaxial graphene van der waals heterostructure two-dimensional electron gas tunneling spectrum

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@article{arxiv.1802.08434,
  title  = {Observation of Interface Superconductivity in a SnSe2-Epitaxial Graphene van der Waals Heterostructure},
  author = {Yi-Min Zhang and Jia-Qi Fan and Wen-Lin Wang and Ding Zhang and Lili Wang and Wei Li and Ke He and Can-Li Song and Xu-Cun Ma and Qi-Kun Xue},
  journal= {arXiv preprint arXiv:1802.08434},
  year   = {2018}
}

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7 pages, 7 figures

Observation of Interface Superconductivity in a SnSe2-Epitaxial Graphene van der Waals Heterostructure

Abstract

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