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- Publisher Website: 10.1038/s41467-021-25438-1
- Scopus: eid_2-s2.0-85115227647
- PMID: 34531383
- WOS: WOS:000696625100022
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Article: Realization of topological Mott insulator in a twisted bilayer graphene lattice model
Title | Realization of topological Mott insulator in a twisted bilayer graphene lattice model |
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Authors | |
Issue Date | 2021 |
Publisher | Nature Research: Fully open access journals. The Journal's web site is located at http://www.nature.com/ncomms/index.html |
Citation | Nature Communications, 2021, v. 12 n. 1, p. article no. 5480 How to Cite? |
Abstract | Magic-angle twisted bilayer graphene has recently become a thriving material platform realizing correlated electron phenomena taking place within its topological flat bands. Several numerical and analytical methods have been applied to understand the correlated phases therein, revealing some similarity with the quantum Hall physics. In this work, we provide a Mott-Hubbard perspective for the TBG system. Employing the large-scale density matrix renormalization group on the lattice model containing the projected Coulomb interactions only, we identify a first-order quantum phase transition between the insulating stripe phase and the quantum anomalous Hall state with the Chern number of ±1. Our results not only shed light on the mechanism of the quantum anomalous Hall state discovered at three-quarters filling, but also provide an example of the topological Mott insulator, i.e., the quantum anomalous Hall state in the strong coupling limit. |
Persistent Identifier | http://hdl.handle.net/10722/305026 |
ISSN | 2021 Impact Factor: 17.694 2020 SCImago Journal Rankings: 5.559 |
PubMed Central ID | |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Chen, B | - |
dc.contributor.author | Liao, YD | - |
dc.contributor.author | Chen, ZY | - |
dc.contributor.author | Vafek, O | - |
dc.contributor.author | Kang, J | - |
dc.contributor.author | Li, W | - |
dc.contributor.author | Meng, ZY | - |
dc.date.accessioned | 2021-10-05T02:38:42Z | - |
dc.date.available | 2021-10-05T02:38:42Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Nature Communications, 2021, v. 12 n. 1, p. article no. 5480 | - |
dc.identifier.issn | 2041-1723 | - |
dc.identifier.uri | http://hdl.handle.net/10722/305026 | - |
dc.description.abstract | Magic-angle twisted bilayer graphene has recently become a thriving material platform realizing correlated electron phenomena taking place within its topological flat bands. Several numerical and analytical methods have been applied to understand the correlated phases therein, revealing some similarity with the quantum Hall physics. In this work, we provide a Mott-Hubbard perspective for the TBG system. Employing the large-scale density matrix renormalization group on the lattice model containing the projected Coulomb interactions only, we identify a first-order quantum phase transition between the insulating stripe phase and the quantum anomalous Hall state with the Chern number of ±1. Our results not only shed light on the mechanism of the quantum anomalous Hall state discovered at three-quarters filling, but also provide an example of the topological Mott insulator, i.e., the quantum anomalous Hall state in the strong coupling limit. | - |
dc.language | eng | - |
dc.publisher | Nature Research: Fully open access journals. The Journal's web site is located at http://www.nature.com/ncomms/index.html | - |
dc.relation.ispartof | Nature Communications | - |
dc.rights | Nature Communications. Copyright © Nature Research: Fully open access journals. | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.title | Realization of topological Mott insulator in a twisted bilayer graphene lattice model | - |
dc.type | Article | - |
dc.identifier.email | Chen, B: bchenhku@hku.hk | - |
dc.identifier.email | Meng, ZY: zymeng@hku.hk | - |
dc.identifier.authority | Meng, ZY=rp02524 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1038/s41467-021-25438-1 | - |
dc.identifier.pmid | 34531383 | - |
dc.identifier.pmcid | PMC8446059 | - |
dc.identifier.scopus | eid_2-s2.0-85115227647 | - |
dc.identifier.hkuros | 325741 | - |
dc.identifier.volume | 12 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | article no. 5480 | - |
dc.identifier.epage | article no. 5480 | - |
dc.identifier.isi | WOS:000696625100022 | - |
dc.publisher.place | United Kingdom | - |