Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4
Abstract The notion of topological insulators (TIs), characterized by an insulating bulk and conducting topological surface states, can be extended to higher-order topological insulators (HOTIs) hosting gapless modes localized at the boundaries of two or more dimensions lower than the insulating bul...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-12-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-43882-z |
| _version_ | 1797397887721668608 |
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| author | Wenxuan Zhao Ming Yang Runzhe Xu Xian Du Yidian Li Kaiyi Zhai Cheng Peng Ding Pei Han Gao Yiwei Li Lixuan Xu Junfeng Han Yuan Huang Zhongkai Liu Yugui Yao Jincheng Zhuang Yi Du Jinjian Zhou Yulin Chen Lexian Yang |
| author_facet | Wenxuan Zhao Ming Yang Runzhe Xu Xian Du Yidian Li Kaiyi Zhai Cheng Peng Ding Pei Han Gao Yiwei Li Lixuan Xu Junfeng Han Yuan Huang Zhongkai Liu Yugui Yao Jincheng Zhuang Yi Du Jinjian Zhou Yulin Chen Lexian Yang |
| author_sort | Wenxuan Zhao |
| collection | DOAJ |
| description | Abstract The notion of topological insulators (TIs), characterized by an insulating bulk and conducting topological surface states, can be extended to higher-order topological insulators (HOTIs) hosting gapless modes localized at the boundaries of two or more dimensions lower than the insulating bulk. In this work, by performing high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements with submicron spatial and spin resolution, we systematically investigate the electronic structure and spin texture of quasi-one-dimensional (1D) HOTI candidate Bi4Br4. In contrast to the bulk-state-dominant spectra on the (001) surface, we observe gapped surface states on the (100) surface, whose dispersion and spin-polarization agree well with our ab-initio calculations. Moreover, we reveal in-gap states connecting the surface valence and conduction bands, which is a signature of the hinge states inside the (100) surface gap. Our findings provide compelling evidence for the HOTI phase of Bi4Br4. The identification of the higher-order topological phase promises applications based on 1D spin-momentum locked current in electronic and spintronic devices. |
| first_indexed | 2024-03-09T01:16:42Z |
| format | Article |
| id | doaj.art-90a412a156124673b0df7a530ac01762 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-09T01:16:42Z |
| publishDate | 2023-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-90a412a156124673b0df7a530ac017622023-12-10T12:24:44ZengNature PortfolioNature Communications2041-17232023-12-011411710.1038/s41467-023-43882-zTopological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4Wenxuan Zhao0Ming Yang1Runzhe Xu2Xian Du3Yidian Li4Kaiyi Zhai5Cheng Peng6Ding Pei7Han Gao8Yiwei Li9Lixuan Xu10Junfeng Han11Yuan Huang12Zhongkai Liu13Yugui Yao14Jincheng Zhuang15Yi Du16Jinjian Zhou17Yulin Chen18Lexian Yang19State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua UniversitySchool of Physics, Beihang UniversityState Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua UniversityState Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua UniversityState Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua UniversityState Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua UniversityDepartment of Physics, Clarendon Laboratory, University of OxfordDepartment of Physics, Clarendon Laboratory, University of OxfordSchool of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research CenterSchool of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research CenterState Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua UniversityCentre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of TechnologyCentre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of TechnologySchool of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research CenterCentre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of TechnologySchool of Physics, Beihang UniversitySchool of Physics, Beihang UniversityCentre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of TechnologyDepartment of Physics, Clarendon Laboratory, University of OxfordState Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua UniversityAbstract The notion of topological insulators (TIs), characterized by an insulating bulk and conducting topological surface states, can be extended to higher-order topological insulators (HOTIs) hosting gapless modes localized at the boundaries of two or more dimensions lower than the insulating bulk. In this work, by performing high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements with submicron spatial and spin resolution, we systematically investigate the electronic structure and spin texture of quasi-one-dimensional (1D) HOTI candidate Bi4Br4. In contrast to the bulk-state-dominant spectra on the (001) surface, we observe gapped surface states on the (100) surface, whose dispersion and spin-polarization agree well with our ab-initio calculations. Moreover, we reveal in-gap states connecting the surface valence and conduction bands, which is a signature of the hinge states inside the (100) surface gap. Our findings provide compelling evidence for the HOTI phase of Bi4Br4. The identification of the higher-order topological phase promises applications based on 1D spin-momentum locked current in electronic and spintronic devices.https://doi.org/10.1038/s41467-023-43882-z |
| spellingShingle | Wenxuan Zhao Ming Yang Runzhe Xu Xian Du Yidian Li Kaiyi Zhai Cheng Peng Ding Pei Han Gao Yiwei Li Lixuan Xu Junfeng Han Yuan Huang Zhongkai Liu Yugui Yao Jincheng Zhuang Yi Du Jinjian Zhou Yulin Chen Lexian Yang Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4 Nature Communications |
| title | Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4 |
| title_full | Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4 |
| title_fullStr | Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4 |
| title_full_unstemmed | Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4 |
| title_short | Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4 |
| title_sort | topological electronic structure and spin texture of quasi one dimensional higher order topological insulator bi4br4 |
| url | https://doi.org/10.1038/s41467-023-43882-z |
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