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

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 practica...

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Published in:arXiv.org 2015-11
Main Authors: Bian, Guang, Ting-Fung, Chung, Liu, Chang, Chen, Chaoyu, Tay-Rong, Chang, Wu, Tailung, Belopolski, Ilya, Zheng, Hao, Su-Yang, Xu, Sanchez, Daniel S, Alidoust, Nasser, Pierce, Jonathan, Bryson Quilliams, Barletta, Philip P, Lorcy, Stephane, Avila, Jose, Chang, Guoqing, Lin, Hsin, Horng-Tay Jeng, Maria-Carmen Asensio, Chen, Yong P, M Zahid Hasan
Format: Article
Language:English
Subjects:
Chemical vapor deposition
Fermions
Graphene
Heterostructures
Organic chemistry
Physical properties
Topological insulators
Topology
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Summary: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 {\pi} 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1511.02413