Electron-hole hybridization in bilayer graphene

Siqi Wang, Mervin Zhao, Changjian Zhang, Sui Yang, Yuan Wang, Kenji Watanabe, Takashi Taniguchi, James Hone, Xiang Zhang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Band structure determines the motion of electrons in a solid, giving rise to exotic phenomena when properly engineered. Drawing an analogy between electrons and photons, artificially designed optical lattices indicate the possibility of a similar band modulation effect in graphene systems. Yet due to the fermionic nature of electrons, modulated electronic systems promise far richer categories of behaviors than those found in optical lattices. Here, we uncovered a strong modulation of electronic states in bilayer graphene subject to periodic potentials. We observed for the first time the hybridization of electron and hole sub-bands, resulting in local band gaps at both primary and secondary charge neutrality points. Such hybridization leads to the formation of flat bands, enabling the study of correlated effects in graphene systems. This work may provide a novel way to manipulate electronic states in layered systems, which is important to both fundamental research and application.

Original languageEnglish (US)
Pages (from-to)248-253
Number of pages6
JournalNational Science Review
Volume7
Issue number2
DOIs
StatePublished - Feb 1 2020
Externally publishedYes

Keywords

  • band modulation
  • bilayer graphene
  • periodic potential

ASJC Scopus subject areas

  • General

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