Heavy Dirac fermions in a graphene/topological insulator hetero-junction

Wendong Cao, Rui Xing Zhang, Peizhe Tang, Gang Yang, Jorge Sofo, Wenhui Duan, Chao Xing Liu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The lowenergy physics of both graphene and surface states of three-dimensional topological insulators (TIs) is described by gapless Dirac fermions with linear dispersion. In this work,we predict the emergence of a 'heavy' Dirac fermion in a graphene/TI hetero-junction, where the linear term almost vanishes and the corresponding energy dispersion becomes highly nonlinear. By combining ab initio calculations and an effective low-energymodel, we showexplicitly howstrong hybridization between Dirac fermions in graphene and the surface states of TIs can reduce the Fermi velocity of Dirac fermions.Due to the negligible linear term, interaction effectswill be greatly enhanced and can drive 'heavy' Dirac fermion states into the half quantum Hall state with non-zero Hall conductance.

Original languageEnglish (US)
Article number034006
Journal2D Materials
Volume3
Issue number3
DOIs
StatePublished - Sep 14 2016

All Science Journal Classification (ASJC) codes

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

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