Determination of interatomic coupling between two-dimensional crystals using angle-resolved photoemission spectroscopy
Journal article, 2020
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.
Author
Joshua Thompson
University of Bath
Chalmers, Physics, Condensed Matter and Materials Theory
D. Pei
University of Oxford
H. Peng
University of Oxford
H. Wang
Chinese Academy of Sciences
N. Channa
University of Bath
The University of Warwick
H. L. Peng
Chinese Academy of Sciences
A. Barinov
Elettra Sincrotrone Trieste
N. B.M. Schröter
Paul Scherrer Institut
University of Oxford
Y. Chen
University of Oxford
M. Mucha-Kruczyński
University of Bath
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 11 1 3582Subject Categories
Atom and Molecular Physics and Optics
Structural Biology
Condensed Matter Physics
DOI
10.1038/s41467-020-17412-0