Capacitive coupling in hybrid Graphene-GaAs nanostructures
arXiv:1503.07100 · doi:10.1063/1.4926855
Abstract
Coupled hybrid nanostructures are demonstrated using the combination of lithographically patterned graphene on top of a two-dimensional electron gas (2DEG) buried in a GaAs/AlGaAs heterostructure. The graphene forms Schottky barriers at the surface of the heterostructure and therefore allows tuning the electronic density of the 2DEG. Conversely, the 2DEG potential can tune the graphene Fermi energy. Graphene-defined quantum point contacts in the 2DEG show half-plateaus of quantized conductance in finite bias spectroscopy and display the 0.7 anomaly for a large range of densities in the constriction, testifying to their good electronic properties. Finally, we demonstrate that the GaAs nanostructure can detect charges in the vicinity of the heterostructure's surface. This confirms the strong coupling of the hybrid device: localized states in the graphene ribbon could in principle be probed by the underlying confined channel. The present hybrid graphene/GaAs nanostructures are promising for the investigation of strong interactions and coherent coupling between the two fundamentally different materials.
References in corpus (14)
- The Raman Fingerprint of Graphene
- Boron nitride substrates for high-quality graphene electronics
- Energy Band Gap Engineering of Graphene Nanoribbons
- Graphene-on-Sapphire and Graphene-on-Glass: Raman Spectroscopy Study
- Quantum dot behavior in graphene nanoconstrictions
- Charge Detection in Graphene Quantum Dots
- Electron-hole pairing in graphene-GaAs heterostructures
- Characterizing wave functions in graphene nanodevices: electronic transport through ultrashort graphene constrictions on a boron nitride substrate
- Precision quantization of Hall resistance in transferred graphene
- Phase Coherent Transport in Graphene Nanoribbons and Graphene Nanoribbon Arrays
- Large contrast enhancement of graphene monolayers by angle detection
- Graphene on Gallium Arsenide: Engineering the visibility
- Graphene nanoribbons: relevance of etching process
- Capacitive coupling in hybrid Graphene-GaAs nanostructures