Atom-by-atom imaging of moiré transformations in 2D transition metal dichalcogenides

Zhang, Yichao; Baek, Ji-Hwan; Lee, Chia-Hao; Jung, Yeonjoon; Hong, Seong Chul; Nolan, Gillian; Watanabe, Kenji; Taniguchi, Takashi; Lee, Gwan-Hyoung; Huang, Pinshane Y.

doi:10.1126/sciadv.adk1874

Title: Atom-by-atom imaging of moiré transformations in 2D transition metal dichalcogenides

Journal Article · 27 March 2024 · Science Advances

DOI: https://doi.org/10.1126/sciadv.adk1874 · OSTI ID:2472276

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University of Illinois at Urbana-Champaign, IL (United States); Univ. of Illinois Urbana-Champaign, IL (United States)
Seoul National University (Korea, Republic of)
University of Illinois at Urbana-Champaign, IL (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)

Understanding the atomic-scale mechanisms that govern the structure of interfaces is critical across materials systems but particularly so for two-dimensional (2D) moiré materials. Here, we image, atom-by-atom, the thermally induced structural evolution of twisted bilayer transition metal dichalcogenides using in situ transmission electron microscopy. We observe low-temperature, local conversion of moiré superlattice into nanoscale aligned domains. Unexpectedly, this process occurs by nucleating a new grain within one monolayer, whose crystal orientation is templated by the other. The aligned domains grow through collective rotation of moiré supercells and hopping of 5|7 defect pairs at moiré boundaries. This provides mechanistic insight into the atomic-scale interactions controlling moiré structures and illustrates the potential to pattern interfacial structure and properties of 2D materials at the nanoscale.

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Research Organization:: University of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Research Foundation of Korea (NRF); Japan Society for the Promotion of Science (JSPS) KAKENHI

Grant/Contract Number:: SC0020190

OSTI ID:: 2472276

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 13 Vol. 10; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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