Determination of interatomic coupling between two-dimensional crystals using angle-resolved photoemission spectroscopy

J. J. P. Thompson, D. Pei, H. Peng, H. Wang, N. Channa, H. L. Peng, A. Barinov, N. B. M. Schröter, Y. Chen and M. Mucha-Kruczyński ()
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J. J. P. Thompson: University of Bath
D. Pei: Department of Physics, University of Oxford
H. Peng: Department of Physics, University of Oxford
H. Wang: Beijing National Laboratory for Molecular Sciences, Peking University
N. Channa: University of Bath
H. L. Peng: Beijing National Laboratory for Molecular Sciences, Peking University
A. Barinov: Elettra-Sincrotrone Trieste ScPA
N. B. M. Schröter: Department of Physics, University of Oxford
Y. Chen: Department of Physics, University of Oxford
M. Mucha-Kruczyński: University of Bath

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Lack of directional bonding between two-dimensional crystals like graphene or monolayer transition metal dichalcogenides provides unusual freedom in the selection of components for vertical van der Waals heterostructures. However, even for identical layers, their stacking, in particular the relative angle between their crystallographic directions, modifies properties of the structure. We demonstrate that the interatomic coupling between two two-dimensional crystals can be determined from angle-resolved photoemission spectra of a trilayer structure with one aligned and one twisted interface. Each of the interfaces provides complementary information and together they enable self-consistent determination of the coupling. We parametrise interatomic coupling for carbon atoms by studying twisted trilayer graphene and show that the result can be applied to structures with different twists and number of layers. Our approach demonstrates how to extract fundamental information about interlayer coupling in a stack of two-dimensional crystals and can be applied to many other van der Waals interfaces.

Date: 2020
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DOI: 10.1038/s41467-020-17412-0

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