Experimental observation of two massless Dirac-fermion gases in graphene-topological insulator heterostructure

• Published in: 2d materials Vol. 3; no. 2; p. 21009
• Main Authors: Bian, Guang, Chung, Ting-Fung, Chen, Chaoyu, Liu, Chang, Chang, Tay-Rong, Wu, Tailung, Belopolski, Ilya, Zheng, Hao, Xu, Su-Yang, Sanchez, Daniel S, Alidoust, Nasser, Pierce, Jonathan, Quilliams, Bryson, Barletta, Philip P, Lorcy, Stephane, Avila, José, Chang, Guoqing, Lin, Hsin, Jeng, Horng-Tay, Asensio, Maria-Carmen, Chen, Yong P, Hasan, M Zahid
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.06.2016
• Subjects: ARPES; Drying; Electronics; Fermions; Graphene; heterostructure; Heterostructures; Insulators; Physical properties; proximity effect; topological insulator; Topology
• ISSN: 2053-1583; 2053-1583
• DOI: 10.1088/2053-1583/3/2/021009

Graphene and topological insulators (TI) possess two-dimensional (2D) 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.