Topological flat bands in a family of multilayer graphene moiré lattices

Waters, Dacen; Su, Ruiheng; Thompson, Ellis; Okounkova, Anna; Arreguin-Martinez, Esmeralda; He, Minhao; Hinds, Katherine; Watanabe, Kenji; Taniguchi, Takashi; Xu, Xiaodong; Zhang, Ya-Hui; Folk, Joshua; Yankowitz, Matthew

doi:10.1038/s41467-024-55001-7

Topological flat bands in a family of multilayer graphene moiré lattices

Journal Article · Wed Dec 04 04:00:00 EST 2024 · Nature Communications

DOI:https://doi.org/10.1038/s41467-024-55001-7· OSTI ID:2913342

^[1]; ^[2]; Thompson, Ellis ^[1]; ^[1]; Arreguin-Martinez, Esmeralda ^[1]; ^[3]; Hinds, Katherine ^[1]; ^[4]; ^[4]; Xu, Xiaodong ^[1]; Zhang, Ya-Hui ^[5]; ^[2]; ^[1]

University of Washington, Seattle, WA (United States)
University of British Columbia, Vancouver, BC (Canada)
University of Washington, Seattle, WA (United States); Princeton University, NJ (United States)
National Institute for Materials Science, Tsukuba (Japan)
Johns Hopkins University, Baltimore, MD (United States)

Moiré materials host a wealth of intertwined correlated and topological states of matter, all arising from flat electronic bands with nontrivial quantum geometry. A prominent example is the family of alternating-twist magic-angle graphene stacks, which exhibit symmetry-broken states at rational fillings of the moiré band and superconductivity close to half filling. Here, we introduce a second family of twisted graphene multilayers made up of twisted sheets of M- and N-layer Bernal-stacked graphene flakes. Calculations indicate that applying an electric displacement field isolates a flat and topological moiré conduction band that is primarily localized to a single graphene sheet below the moiré interface. Phenomenologically, the result is a striking similarity in the hierarchies of symmetry-broken phases across this family of twisted graphene multilayers. Our results show that this family of structures offers promising new opportunities for the discovery of exotic new correlated and topological phenomena, enabled by using the layer number to fine tune the flat moiré band and its screening environment.

View Accepted Manuscript (DOE)

Research Organization:: University of Washington, Seattle, WA (United States)

Sponsoring Organization:: National Science Foundation (NSF) CAREER; USDOE Office of Science (SC), Basic Energy Sciences (BES); JSPS KAKENHI

Grant/Contract Number:: SC0023062

OSTI ID:: 2913342

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Springer Science and Business Media LLCCopyright Statement

Country of Publication:: United States

Language:: English

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