Experimental Observation of Two Massless Dirac-Fermion Gases in Graphene-Topological Insulator Heterostructure

Abstract

Graphene and topological insulators (TI) possess two-dimensional Dirac fermions with distinct physical properties. Integrating these two Dirac materials in a single device creates interesting opportunities for exploring new physics of interacting massless Dirac fermions. Here we report on a practical route to experimental fabrication of graphene-Sb2Te3 heterostructure. The graphene-TI heterostructures are prepared by using a dry transfer of chemical-vapor-deposition grown graphene film. ARPES measurements confirm the coexistence of topological surface states of Sb2Te3 and Dirac π bands of graphene, and identify the twist angle in the graphene-TI heterostructure. The results suggest a potential tunable electronic platform in which two different Dirac low-energy states dominate the transport behavior.

References in corpus (4)

• The electronic properties of graphene
• Chiral tunneling and the Klein paradox in graphene
• First direct observation of Dirac fermions in graphite
• Quantum Anomalous Hall Effect in Graphene Proximity Coupled to an Antiferromagnetic Insulator

Cited by in corpus (8)

• Spin Proximity Effects in Graphene/Topological Insulator Heterostructures
• Emergence of Frohlich polaron from interlayer electron-phonon coupling in van der Waals heterostructure
• Giant Edelstein effect in Topological-Insulator--Graphene heterostructures
• A moiré superlattice on the surface of a topological insulator
• Local and Global Screening Properties of Graphene Revealed through Landau Level Spectroscopy
• Magic angle conditions for twisted 3D topological insulators
• Transmission in graphene-topological insulator heterostructures
• Discovery of magnetic topological crystals