Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures
Abstract The presence of topological flat minibands in moiré materials provides an opportunity to explore the interplay between topology and correlation. In this work, we study moiré minibands in topological insulator films with two hybridized surface states under a moiré superlattice potential crea...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-03-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-46717-7 |
| _version_ | 1827183702583541760 |
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| author | Kaijie Yang Zian Xu Yanjie Feng Frank Schindler Yuanfeng Xu Zhen Bi B. Andrei Bernevig Peizhe Tang Chao-Xing Liu |
| author_facet | Kaijie Yang Zian Xu Yanjie Feng Frank Schindler Yuanfeng Xu Zhen Bi B. Andrei Bernevig Peizhe Tang Chao-Xing Liu |
| author_sort | Kaijie Yang |
| collection | DOAJ |
| description | Abstract The presence of topological flat minibands in moiré materials provides an opportunity to explore the interplay between topology and correlation. In this work, we study moiré minibands in topological insulator films with two hybridized surface states under a moiré superlattice potential created by two-dimensional insulating materials. We show the lowest conduction (highest valence) Kramers’ pair of minibands can be $${{\mathbb{Z}}}_{2}$$ Z 2 non-trivial when the minima (maxima) of moiré potential approximately form a hexagonal lattice with six-fold rotation symmetry. Coulomb interaction can drive the non-trivial Kramers’ minibands into the quantum anomalous Hall state when they are half-filled, which is further stabilized by applying external gate voltages to break inversion. We propose the monolayer Sb2 on top of Sb2Te3 films as a candidate based on first principles calculations. Our work demonstrates the topological insulator based moiré heterostructure as a potential platform for studying interacting topological phases. |
| first_indexed | 2024-04-24T16:16:42Z |
| format | Article |
| id | doaj.art-951a2733ea3340a78508afda95cbff36 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2025-03-21T06:22:48Z |
| publishDate | 2024-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-951a2733ea3340a78508afda95cbff362024-07-21T11:24:30ZengNature PortfolioNature Communications2041-17232024-03-011511810.1038/s41467-024-46717-7Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructuresKaijie Yang0Zian Xu1Yanjie Feng2Frank Schindler3Yuanfeng Xu4Zhen Bi5B. Andrei Bernevig6Peizhe Tang7Chao-Xing Liu8Department of Physics, the Pennsylvania State UniversitySchool of Materials Science and Engineering, Beihang UniversitySchool of Materials Science and Engineering, Beihang UniversityBlackett Laboratory, Imperial College LondonCenter for Correlated Matter and School of Physics, Zhejiang UniversityDepartment of Physics, the Pennsylvania State UniversityDepartment of Physics, Princeton UniversitySchool of Materials Science and Engineering, Beihang UniversityDepartment of Physics, the Pennsylvania State UniversityAbstract The presence of topological flat minibands in moiré materials provides an opportunity to explore the interplay between topology and correlation. In this work, we study moiré minibands in topological insulator films with two hybridized surface states under a moiré superlattice potential created by two-dimensional insulating materials. We show the lowest conduction (highest valence) Kramers’ pair of minibands can be $${{\mathbb{Z}}}_{2}$$ Z 2 non-trivial when the minima (maxima) of moiré potential approximately form a hexagonal lattice with six-fold rotation symmetry. Coulomb interaction can drive the non-trivial Kramers’ minibands into the quantum anomalous Hall state when they are half-filled, which is further stabilized by applying external gate voltages to break inversion. We propose the monolayer Sb2 on top of Sb2Te3 films as a candidate based on first principles calculations. Our work demonstrates the topological insulator based moiré heterostructure as a potential platform for studying interacting topological phases.https://doi.org/10.1038/s41467-024-46717-7 |
| spellingShingle | Kaijie Yang Zian Xu Yanjie Feng Frank Schindler Yuanfeng Xu Zhen Bi B. Andrei Bernevig Peizhe Tang Chao-Xing Liu Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures Nature Communications |
| title | Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures |
| title_full | Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures |
| title_fullStr | Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures |
| title_full_unstemmed | Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures |
| title_short | Topological minibands and interaction driven quantum anomalous Hall state in topological insulator based moiré heterostructures |
| title_sort | topological minibands and interaction driven quantum anomalous hall state in topological insulator based moire heterostructures |
| url | https://doi.org/10.1038/s41467-024-46717-7 |
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