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

Guang Bian, Ting Fung Chung, Chaoyu Chen, Chang Liu, Tay Rong Chang, Tailung Wu, Ilya Belopolski, Hao Zheng, Su Yang Xu, Daniel S. Sanchez, Nasser Alidoust, Jonathan Pierce, Bryson Quilliams, Philip P. Barletta, Stephane Lorcy, José Avila, Guoqing Chang, Hsin Lin, Horng Tay Jeng, Maria Carmen AsensioYong P. Chen, M. Zahid Hasan

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

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-Sb2Te3heterostructure. 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 Sb2Te3and Dirac 7rbands 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.

Original languageEnglish (US)
Article number021009
Journal2D Materials
Volume3
Issue number2
DOIs
StatePublished - May 11 2016

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • ARPES
  • Graphene
  • Heterostructure
  • Proximity effect
  • Topological insulator

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