Composite super-moiré lattices in double aligned graphene heterostructures

Zihao Wang, Yi Bo Wang, Jun Yin, Endre Tovari, Y. Yang, L. Lin, Matthew Holwill, John Birkbeck, David Perello, S. Xu, Johanna Zultak, Roman Gorbachev, Andrey Kretinin, T. Taniguchi, K Watanabe, Sergey Morozov, M Andelkovic, S. Milovanovic, L. Covaci, F. M. PeetersArtem Mishchenko, Andre Geim, Konstantin Novoselov, Vladimir Fal'ko, Angelika Knothe, Colin Woods

Research output: Contribution to journalArticlepeer-review

Abstract

When two-dimensional atomic crystals are brought into close proximity to form a van der Waals heterostructure, neighbouring crystals can start influencing each other’s electronic properties. Of particular interest is the situation when the periodicity of the two crystals closely match and a moiré pattern forms, which results in specific electron scattering, reconstruction of electronic and excitonic spectra, crystal reconstruction, and many other effects. Thus, formation of moiré patterns is a viable tool of controlling the electronic properties of 2D materials. At the same time, the difference in the interatomic distances for the two crystals combined, determines the range in which the electronic spectrum is reconstructed, and thus is a barrier to the low energy regime. Here we present a way which allows spectrum reconstruction at all energies. By using graphene which is aligned simultaneously to two hexagonal boron nitride layers, one can make electrons scatter in the differential moiré pattern, which can have arbitrarily small wavevector and, thus results in spectrum reconstruction at arbitrarily low energies. We demonstrate that the strength of such a potential relies crucially on the atomic reconstruction of graphene within the differential moiré super-cell.
Original languageEnglish
Article numbereaay8897
Pages (from-to)1-7
Number of pages7
JournalScience Advances
Volume5
Early online date20 Dec 2019
DOIs
Publication statusPublished - 2020

Research Beacons, Institutes and Platforms

  • National Graphene Institute

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