Engineering high quality graphene superlattices via ion milled ultra-thin etching masks

David Barcons Ruiz, Hanan Herzig Sheinfux, Rebecca Hoffmann, Iacopo Torre, Hitesh Agarwal, Roshan Krishna Kumar, Lorenzo Vistoli, Takashi Taniguchi, Kenji Watanabe, Adrian Bachtold and Frank H. L. Koppens ()
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David Barcons Ruiz: The Barcelona Institute of Science and Technology
Hanan Herzig Sheinfux: The Barcelona Institute of Science and Technology
Rebecca Hoffmann: The Barcelona Institute of Science and Technology
Iacopo Torre: The Barcelona Institute of Science and Technology
Hitesh Agarwal: The Barcelona Institute of Science and Technology
Roshan Krishna Kumar: The Barcelona Institute of Science and Technology
Lorenzo Vistoli: The Barcelona Institute of Science and Technology
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Adrian Bachtold: The Barcelona Institute of Science and Technology
Frank H. L. Koppens: The Barcelona Institute of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Nanofabrication research pursues the miniaturization of patterned feature size. In the current state of the art, micron scale areas can be patterned with features down to ~30 nm pitch using electron beam lithography. Here, we demonstrate a nanofabrication technique which allows patterning periodic structures with a pitch down to 16 nm. It is based on focused ion beam milling of suspended membranes, with minimal proximity effects typical to standard electron beam lithography. The membranes are then transferred and used as hard etching masks. We benchmark our technique by electrostatically inducing a superlattice potential in graphene and observe bandstructure modification in electronic transport. Our technique opens the path towards the realization of very short period superlattices in 2D materials, but with the ability to control lattice symmetries and strength. This can pave the way for a versatile solid-state quantum simulator platform and the study of correlated electron phases.

Date: 2022
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DOI: 10.1038/s41467-022-34734-3

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