Topological Phase Transition in Quasi-One-Dimensional Bismuth Iodide Bi4I4
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Zhao, W. X. Yang, M. Du, X. Li, Y. D. Zhai, K. Y. Hu, Y. Q. Han, J. F. Huang, Y. Liu, Z. K. Yao, Y. G. Zhuang, J. C. Du, Y. Zhou, J. J. Chen, Y. L. Yang, L. X. |
| author_facet | Zhao, W. X. Yang, M. Du, X. Li, Y. D. Zhai, K. Y. Hu, Y. Q. Han, J. F. Huang, Y. Liu, Z. K. Yao, Y. G. Zhuang, J. C. Du, Y. Zhou, J. J. Chen, Y. L. Yang, L. X. |
| contents | The exploration of topological quantum materials and topological phase transitions is at the forefront of modern condensed matter physics. Quasi-one-dimensional (quasi-1D) bismuth iodide Bi4I4 exhibits versatile topological phases of matter including weak topological insulator (WTI) and higher-order topological insulator (HOTI) phases with high tunability in response to external parameters. In this work, performing laser-based angle-resolved photoemission spectroscopy with submicron spatial resolution (micro-ARPES), we comprehensively investigate the fine electronic structure and topological phase transition of Bi4I4. Our examination of the low-temperature α-phase reveals the presence of an energy gap on the (100) surface, providing spectroscopic evidence for the HOTI phase. Conversely, the high-temperature β-Bi4I4 harbors a gapless Dirac fermion on the (100) surface alongside gapped states on the (001) surface, thereby establishing a WTI phase. By tracking the temperature evolution of the (100) surface states, we unveil a thermal hysteresis of the surface gap in line with the α-β structural phase transition. Our findings elucidate the topological properties of Bi4I4 and directly evidence a temperature-induced topological phase transition from WTI to HOTI, which paves the way to potential applications based on the room-temperature topological phase transition in the quasi-1D topological quantum material. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_19375 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Topological Phase Transition in Quasi-One-Dimensional Bismuth Iodide Bi4I4 Zhao, W. X. Yang, M. Du, X. Li, Y. D. Zhai, K. Y. Hu, Y. Q. Han, J. F. Huang, Y. Liu, Z. K. Yao, Y. G. Zhuang, J. C. Du, Y. Zhou, J. J. Chen, Y. L. Yang, L. X. Materials Science Mesoscale and Nanoscale Physics The exploration of topological quantum materials and topological phase transitions is at the forefront of modern condensed matter physics. Quasi-one-dimensional (quasi-1D) bismuth iodide Bi4I4 exhibits versatile topological phases of matter including weak topological insulator (WTI) and higher-order topological insulator (HOTI) phases with high tunability in response to external parameters. In this work, performing laser-based angle-resolved photoemission spectroscopy with submicron spatial resolution (micro-ARPES), we comprehensively investigate the fine electronic structure and topological phase transition of Bi4I4. Our examination of the low-temperature α-phase reveals the presence of an energy gap on the (100) surface, providing spectroscopic evidence for the HOTI phase. Conversely, the high-temperature β-Bi4I4 harbors a gapless Dirac fermion on the (100) surface alongside gapped states on the (001) surface, thereby establishing a WTI phase. By tracking the temperature evolution of the (100) surface states, we unveil a thermal hysteresis of the surface gap in line with the α-β structural phase transition. Our findings elucidate the topological properties of Bi4I4 and directly evidence a temperature-induced topological phase transition from WTI to HOTI, which paves the way to potential applications based on the room-temperature topological phase transition in the quasi-1D topological quantum material. |
| title | Topological Phase Transition in Quasi-One-Dimensional Bismuth Iodide Bi4I4 |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2407.19375 |