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We intercalate a van der Waals heterostructure of graphene and hexagonalBoron Nitride with Au, by encapsulation, and show that Au at the interface istwo dimensional. A charge transfer upon current annealing indicatesredistribution of Au and induces splitting of the graphene bandstructure. Theeffect of in plane magnetic field confirms that splitting is due tospin-splitting and that spin polarization is in the plane, characteristic of aRashba interaction with magnitude approximately 25 meV. Consistent with thepresence of intrinsic interfacial electric field we show that the splitting canbe enhanced by an applied displacement field in dual gated samples. Giantnegative magnetoresistance, up to 75%, and a field induced anomalous Halleffect at magnetic fields < 1 T are observed. These demonstrate that hybridizedAu has a magnetic moment and suggests the proximity to formation of acollective magnetic phase. These effects persist close to room temperature.

Rashba interaction and local magnetic moments in a graphene-Boron Nitride heterostructure by intercalation with Au