Spinor-dominated magnetoresistance in β-Ag2Se
Abstract A topological insulator is a quantum material which possesses conducting surfaces and an insulating bulk. Despite extensive researches on the properties of Dirac surface states, the characteristics of bulk states have remained largely unexplored. Here we report the observation of spinor-dom...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-12-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-024-01872-7 |
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| author | Cheng-Long Zhang Yilin Zhao Yiyuan Chen Ziquan Lin Sen Shao Zhen-Hao Gong Junfeng Wang Hai-Zhou Lu Guoqing Chang Shuang Jia |
| author_facet | Cheng-Long Zhang Yilin Zhao Yiyuan Chen Ziquan Lin Sen Shao Zhen-Hao Gong Junfeng Wang Hai-Zhou Lu Guoqing Chang Shuang Jia |
| author_sort | Cheng-Long Zhang |
| collection | DOAJ |
| description | Abstract A topological insulator is a quantum material which possesses conducting surfaces and an insulating bulk. Despite extensive researches on the properties of Dirac surface states, the characteristics of bulk states have remained largely unexplored. Here we report the observation of spinor-dominated magnetoresistance anomalies in β-Ag2Se, induced by a magnetic-field-driven band topological phase transition. These anomalies are caused by intrinsic orthogonality in the wave-function spinors of the last Landau bands of the bulk states, in which backscattering is strictly forbidden during a band topological phase transition. This new type of longitudinal magnetoresistance, purely controlled by the wave-function spinors of the last Landau bands, highlights a unique signature of electrical transport around the band topological phase transition. With further reducing the quantum limit and gap size in β-Ag2Se, our results may also suggest possible device applications based on this spinor-dominated mechanism and signify a rare case where topology enters the realm of magnetoresistance control. |
| format | Article |
| id | doaj-art-0b9edef125964e4e9d8fb24d98690c03 |
| institution | OA Journals |
| issn | 2399-3650 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj-art-0b9edef125964e4e9d8fb24d98690c032025-08-20T02:20:48ZengNature PortfolioCommunications Physics2399-36502024-12-01711610.1038/s42005-024-01872-7Spinor-dominated magnetoresistance in β-Ag2SeCheng-Long Zhang0Yilin Zhao1Yiyuan Chen2Ziquan Lin3Sen Shao4Zhen-Hao Gong5Junfeng Wang6Hai-Zhou Lu7Guoqing Chang8Shuang Jia9Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of SciencesDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological UniversityDepartment of Physics and Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and TechnologyWuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and TechnologyDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological UniversityDepartment of Physics and Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and TechnologyWuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and TechnologyDepartment of Physics and Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and TechnologyDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological UniversityInternational Center for Quantum Materials, School of Physics, Peking UniversityAbstract A topological insulator is a quantum material which possesses conducting surfaces and an insulating bulk. Despite extensive researches on the properties of Dirac surface states, the characteristics of bulk states have remained largely unexplored. Here we report the observation of spinor-dominated magnetoresistance anomalies in β-Ag2Se, induced by a magnetic-field-driven band topological phase transition. These anomalies are caused by intrinsic orthogonality in the wave-function spinors of the last Landau bands of the bulk states, in which backscattering is strictly forbidden during a band topological phase transition. This new type of longitudinal magnetoresistance, purely controlled by the wave-function spinors of the last Landau bands, highlights a unique signature of electrical transport around the band topological phase transition. With further reducing the quantum limit and gap size in β-Ag2Se, our results may also suggest possible device applications based on this spinor-dominated mechanism and signify a rare case where topology enters the realm of magnetoresistance control.https://doi.org/10.1038/s42005-024-01872-7 |
| spellingShingle | Cheng-Long Zhang Yilin Zhao Yiyuan Chen Ziquan Lin Sen Shao Zhen-Hao Gong Junfeng Wang Hai-Zhou Lu Guoqing Chang Shuang Jia Spinor-dominated magnetoresistance in β-Ag2Se Communications Physics |
| title | Spinor-dominated magnetoresistance in β-Ag2Se |
| title_full | Spinor-dominated magnetoresistance in β-Ag2Se |
| title_fullStr | Spinor-dominated magnetoresistance in β-Ag2Se |
| title_full_unstemmed | Spinor-dominated magnetoresistance in β-Ag2Se |
| title_short | Spinor-dominated magnetoresistance in β-Ag2Se |
| title_sort | spinor dominated magnetoresistance in β ag2se |
| url | https://doi.org/10.1038/s42005-024-01872-7 |
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