Rashba Interaction and Local Magnetic Moments in a Graphene-BN Heterostructure Intercalated with Au

We intercalate a van der Waals heterostructure of graphene and hexagonal boron nitride with Au, by encapsulation, and show that the Au at the interface is two dimensional. Charge transfer upon current annealing indicates the redistribution of the Au and induces splitting of the graphene band structu...

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Bibliographic Details
Published in:Physical review letters 2016-08, Vol.117 (7), p.076603-076603, Article 076603
Main Authors: O'Farrell, E C T, Tan, J Y, Yeo, Y, Koon, G K W, Özyilmaz, B, Watanabe, K, Taniguchi, T
Format: Article
Language:English
Subjects:
Boron nitride
Charge transfer
Electric fields
Graphene
Heterostructures
Magnetic fields
Magnetic moment
Splitting
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Summary:We intercalate a van der Waals heterostructure of graphene and hexagonal boron nitride with Au, by encapsulation, and show that the Au at the interface is two dimensional. Charge transfer upon current annealing indicates the redistribution of the Au and induces splitting of the graphene band structure. The effect of an in-plane magnetic field confirms that the splitting is due to spin splitting and that the spin polarization is in the plane, characteristic of a Rashba interaction with a magnitude of approximately 25 meV. Consistent with the presence of an intrinsic interfacial electric field we show that the splitting can be enhanced by an applied displacement field in dual gated samples. A giant negative magnetoresistance, up to 75%, and a field induced anomalous Hall effect at magnetic fields
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.117.076603