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Observation of interface superconductivity in a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SnSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> /epitaxial graphene van der Waals heterostructure
A van der Waals heterostructure composed of graphitized SiC(0001) and the semiconductor SnSe${}_{2}$ shows conventional BCS-type superconductivity that is firmly corroborated by the presence of quantized vortices under an external magnetic field. Interface engineering has revealed that the observed superconductivity originates from a two-dimensional electron gas confined to the very …