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

  • Author(s): Bian, G;
  • Chung, TF;
  • Chen, C;
  • Liu, C;
  • Chang, TR;
  • Wu, T;
  • Belopolski, I;
  • Zheng, H;
  • Xu, SY;
  • Sanchez, DS;
  • Alidoust, N;
  • Pierce, J;
  • Quilliams, B;
  • Barletta, PP;
  • Lorcy, S;
  • Avila, J;
  • Chang, G;
  • Lin, H;
  • Jeng, HT;
  • Asensio, MC;
  • Chen, YP;
  • Hasan, MZ
  • et al.
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.

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