Evidence of Local Commensurate State with Lattice Match of Graphene on Hexagonal Boron Nitride

Na Yeon Kim, Hu Young Jeong, Jung Hwa Kim, Gwangwoo Kim, Hyeon Suk Shin, Zonghoon Lee

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Transition to a commensurate state changes the local symmetry periodicity on two-dimensional van der Waals superstructures, evoking distinctive properties far beyond individual layers. We investigate the morphology of moiré superstructures of graphene on hexagonal boron nitride (hBN) with a low twist angle (≈0°) through moiré fringe analyses with dark field transmission electron microscopy. The moiré fringes exhibit local variation, suggesting that the interaction between graphene and hBN depends on the stacking configuration and that local transition to the commensurate state occurs through the reduced crystalline mismatch (that is, by lattice stretching and twisting on the graphene lattices). This moiré superstructure analysis suggests an inventive method for studying the interaction between stacked van der Waals layers and for discerning the altered electronic and optical properties of graphene on hBN superstructures with a low twist angle, even at low magnification.

Original languageEnglish
Pages (from-to)7084-7090
Number of pages7
JournalACS Nano
Volume11
Issue number7
DOIs
StatePublished - Jul 25 2017
Externally publishedYes

Funding

This work was supported by the Institute for Basic Science (IBS-R019-D1), a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. 2015R1A2A2A01006992), and the Nano Material Technology Development Program (2012M3A7B4049807).

Keywords

  • boron nitride
  • commensurate
  • dark field transmission electron microscopy
  • graphene
  • moiré

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