Emergence of Tertiary Dirac Points in Graphene Moiré Superlattices

Guorui Chen, Mengqiao Sui, Duoming Wang, Shuopei Wang, Jeil Jung, Pilkyung Moon, Shaffique Adam, Kenji Watanabe, Takashi Taniguchi, Shuyun Zhou, Mikito Koshino, Guangyu Zhang, Yuanbo Zhang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The electronic structure of a crystalline solid is largely determined by its lattice structure. Recent advances in van der Waals solids, artificial crystals with controlled stacking of two-dimensional (2D) atomic films, have enabled the creation of materials with novel electronic structures. In particular, stacking graphene on hexagonal boron nitride (hBN) introduces a moiré superlattice that fundamentally modifies graphene's band structure and gives rise to secondary Dirac points (SDPs). Here we find that the formation of a moiré superlattice in graphene on hBN yields new, unexpected consequences: A set of tertiary Dirac points (TDPs) emerge, which give rise to additional sets of Landau levels when the sample is subjected to an external magnetic field. Our observations hint at the formation of a hidden Kekulé superstructure on top of the moiré superlattice under appropriate carrier doping and magnetic fields.

Original languageEnglish
Pages (from-to)3576-3581
Number of pages6
JournalNano Letters
Volume17
Issue number6
DOIs
Publication statusPublished - 2017 Jun 14

Keywords

  • Graphene
  • Landau level
  • graphene superlattice
  • moiré pattern
  • tertiary Dirac point

ASJC Scopus subject areas

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

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