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

Abstract

We intercalate a van der Waals heterostructure of graphene and hexagonal Boron Nitride with Au, by encapsulation, and show that Au at the interface is two dimensional. A charge transfer upon current annealing indicates redistribution of Au and induces splitting of the graphene bandstructure. The effect of in plane magnetic field confirms that splitting is due to spin-splitting and that spin polarization is in the plane, characteristic of a Rashba interaction with magnitude approximately 25 meV. Consistent with the presence of intrinsic interfacial electric field we show that the splitting can be enhanced by an applied displacement field in dual gated samples. Giant negative magnetoresistance, up to 75%, and a field induced anomalous Hall effect at magnetic fields < 1 T are observed. These demonstrate that hybridized Au has a magnetic moment and suggests the proximity to formation of a collective magnetic phase. These effects persist close to room temperature.

References in corpus (7)

• Boron nitride substrates for high-quality graphene electronics
• Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation
• Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
• Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects
• Quantum Hall effect and Landau level crossing of Dirac fermions in trilayer graphene
• Formation of a topological non-Fermi liquid in MnSi
• Giant negative magnetoresistance driven by spin-orbit coupling at the LAO/STO interface

Cited by in corpus (4)

• Proximity-induced diversified magnetic states and electrically-controllable spin polarization in bilayer graphene: Towards layered spintronics
• Large Rashba Spin-Orbit Coupling and High-Temperature Quantum Anomalous Hall Effect in Re-Intercalated Graphene/CrI${}_3$ Heterostructure
• Rashba spin splitting based on trilayer graphene systems
• Layered Opposite Rashba Spin-Orbit Coupling in Bilayer Graphene: Loss of Spin Chirality, Symmetry Breaking and Topological Transition