Evidence of Local Commensurate State with Lattice Match of Graphene on Hexagonal Boron Nitride
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- Evidence of Local Commensurate State with Lattice Match of Graphene on Hexagonal Boron Nitride
- Kim, Na Yeon; Jeong, Hu Young; Kim, Jung Hwa; Kim, Gwangwoo; Shin, Hyeon Suk; Lee, Zonghoon
- boron nitride; commensurate; dark field transmission electron microscopy; graphene; moiré
- Issue Date
- AMER CHEMICAL SOC
- ACS NANO, v.11, no.7, pp.7084 - 7090
- 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 moire superstructures of graphene on hexagonal boron nitride (hBN) with a low twist angle (approximate to 0 degrees) through moire fringe analyses with dark field transmission electron microscopy. The moire 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 moire 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.
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