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Description:

The supermoiré lattice, built by stacking two moiré patterns, provides a platform for creating flat mini-bands and studying electron correlations. An ultimate challenge in assembling a graphene supermoiré lattice is in the deterministic control of its rotational alignment, which is made highly probabilistic due to the random nature of the edge chirality and crystal symmetry of each component layer. In this work, we present an experimental strategy to overcome this challenge and realize the controlled alignment of double-aligned hBN/graphene/hBN supermoiré lattice. Remarkably, we find that the crystallographic edge of neighboring graphite can be used to better guide the stacking alignment, as demonstrated by the controlled production of 20 moiré samples with an accuracy better than ~0.2º. Employing this technique, we are the first to fabricate the perfect double-aligned graphene supermoiré lattice and to observe the sharp resistivity peaks at band filling of 0, -4 and -8 electrons per moiré unit cell. Finally, we extend our technique to other strongly correlated electron systems, such as low-angle twisted bilayer graphene and ABC-stacked trilayer graphene, providing a strategy for flat-band engineering in these moiré materials.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Supermoiré lattice, graphene, rotational alignment

Date published: 2023-07-12

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 14 issue. 1 4142

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-023-39893-5

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Updated at: 2025-02-23 22:48:33 +0900

Published on MDR: 2025-02-23 22:48:33 +0900