# Local spectroscopy of a gate-switchable moiré quantum anomalous Hall insulator https://mdr.nims.go.jp/datasets/81c0451f-c5bd-4ecd-91e1-febc4c6c9dcc ## File - [s41467-023-39110-3.pdf](https://mdr.nims.go.jp/filesets/b77d65ed-4fa7-4c88-9489-6efb989f5d6d/download) ([Detail](https://mdr.nims.go.jp/filesets/b77d65ed-4fa7-4c88-9489-6efb989f5d6d.md)) ## Id 81c0451f-c5bd-4ecd-91e1-febc4c6c9dcc ## Local identifier ## Visibility open_to_public ## State published ## Created at 2025-02-14T08:20:50.067958Z ## Updated at 2025-02-15T03:31:37.265822Z ## Published at 2025-02-15T03:31:37.367880Z ## Doi ## First published url https://doi.org/10.1038/s41467-023-39110-3 ## Date published 2023-06-16 ## Recorded date published ## Resource type journal_article ## Manuscript type vor ## Collection ## Title - title: Local spectroscopy of a gate-switchable moiré quantum anomalous Hall insulator title_type: original lang: en ## Description - description: Twisting and stacking atomically-thin materials provides a versatile platform for investigating emergent quantum phases of matter driven by strong correlation and non-trivial topology. Novel phenomena such as correlated insulating states, unconventional superconductivity, and the quantum anomalous Hall effect have been observed in several twisted moiré systems, but fully understanding the underlying microscopic mechanisms remains challenging. Measurements performed on different samples of the same twisted system often exhibit different low-temperature phase diagrams, suggesting that the ground states of these materials could be susceptible to local structural inhomogeneity that is difficult to capture through macroscopic probes. We have used scanning tunneling microscopy and spectroscopy to demonstrate the interplay between correlation, topology, and local structural parameters in determining the behavior of twisted monolayer-bilayer graphene. We observe local spectroscopic signatures for correlated insulating states having total Chern number Ctot = ±2 at ¾-filling of the conduction moiré mini-band and have characterized their evolution in an out-of-plane magnetic field. We have determined the relationship between topological behavior and local twist angle accompanied by hetero-strain, and show that the sign of Ctot can be controlled via electrostatic gating over a limited range of twist angles under small strain but not as the strain grows larger. The electrical control of Chern number results from a competition between the orbital magnetizations of filled bulk bands and chiral edge states that is sensitive to strain-induced distortion in the moiré superlattice. description_type: abstract lang: und ## Creator - name: Canxun Zhang role: author - name: Tiancong Zhu role: author - name: Tomohiro Soejima role: author - name: Salman Kahn role: author - name: Kenji Watanabe role: author orcid: https://orcid.org/0000-0003-3701-8119 organization: National Institute for Materials Science - name: Takashi Taniguchi role: author orcid: https://orcid.org/0000-0002-1467-3105 organization: National Institute for Materials Science - name: Alex Zettl role: author - name: Feng Wang role: author - name: Michael P. Zaletel role: author - name: Michael F. Crommie role: author ## Contact agent ## Publisher organization: Springer Science and Business Media LLC ## Managing organization ## Keyword - subject: Correlated insulating states schema: not_defined - subject: unconventional superconductivity schema: not_defined - subject: moiré heterostructures2¥ schema: not_defined ## Rights - identifier: https://creativecommons.org/licenses/by/4.0/ ## Other identifier(s) ## Data origin ## Embargo ## Journal - title: Nature Communications issn: '20411723' volume: '14' issue: '1' article_number: '3595' ## Conference ## Related item ## Funding - identifier: Center for Novel Pathways to Quantum Coherence in Materials, an Energy Frontier Research Center funder_name: DOE | SC | Basic Energy Sciences - identifier: KCWF16 funder_name: DOE | SC | Basic Energy Sciences - identifier: Molecular Foundry at LBNL funder_name: DOE | SC | Basic Energy Sciences - identifier: KCWF16 funder_name: DOE | SC | Basic Energy Sciences - identifier: Center for Novel Pathways to Quantum Coherence in Materials, an Energy Frontier Research Center funder_name: DOE | SC | Basic Energy Sciences - identifier: KC2301 funder_name: DOE | SC | Basic Energy Sciences - identifier: KCWF16 funder_name: DOE | SC | Basic Energy Sciences - identifier: Molecular Foundry at LBNL funder_name: DOE | SC | Basic Energy Sciences - identifier: Center for Novel Pathways to Quantum Coherence in Materials, an Energy Frontier Research Center funder_name: DOE | SC | Basic Energy Sciences - identifier: KCWF16 funder_name: DOE | SC | Basic Energy Sciences - identifier: Molecular Foundry at LBNL funder_name: DOE | SC | Basic Energy Sciences - identifier: Center for Novel Pathways to Quantum Coherence in Materials, an Energy Frontier Research Center funder_name: DOE | SC | Basic Energy Sciences - identifier: KCWF16 funder_name: DOE | SC | Basic Energy Sciences - identifier: Molecular Foundry at LBNL funder_name: DOE | SC | Basic Energy Sciences - identifier: KC2301 funder_name: DOE | SC | Basic Energy Sciences - identifier: DMR-2221750 funder_name: National Science Foundation - identifier: DMR-2221750 funder_name: National Science Foundation - identifier: DMR-2221750 funder_name: National Science Foundation - identifier: DMR-2221750 funder_name: National Science Foundation - funder_name: C.Z. acknowledges support from a Kavli ENSI Philomathia Graduate Student Fellowship. - funder_name: T.S. acknowledges fellowship support from the Masason Foundation. - identifier: 20H00354, 21H05233, 23H02052 funder_name: MEXT | Japan Society for the Promotion of Science - identifier: 20H00354, 21H05233, 23H02052 funder_name: MEXT | Japan Society for the Promotion of Science - identifier: World Premier International Research Center Initiative (WPI) funder_name: Ministry of Education, Culture, Sports, Science and Technology - identifier: World Premier International Research Center Initiative (WPI) funder_name: Ministry of Education, Culture, Sports, Science and Technology ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: b77d65ed-4fa7-4c88-9489-6efb989f5d6d filename: s41467-023-39110-3.pdf content_type: application/pdf size: 2800491 md5: 47cd5569caa81eec96e3956703c4addf ## Thumbnail fileset_id: b77d65ed-4fa7-4c88-9489-6efb989f5d6d filename: s41467-023-39110-3.pdf