Topological phase transition in quasi-one-dimensional bismuth iodide Bi<sub>4</sub>I<sub>4</sub>

doi:10.1038/s41535-024-00711-w

	Topological phase transition in quasi-one-dimensional bismuth iodide Bi₄I₄
	Zhao, W. X.1; Yang, M.2,3; Du, X.1; Li, Y. D.1; Zhai, K. Y.1; Hu, Y. Q.1; Han, J. F.4,5; Huang, Y.4,5; Liu, Z. K.6,7,8 ; Yao, Y. G.4,5; Zhuang, J. C.2,3; Du, Y.2,3; Zhou, J. J.4; Chen, Y. L.6,7,8,9 ; Yang, L. X.1,10,11
	2024-12-20
发表期刊	NPJ QUANTUM MATERIALS (IF:5.4[JCR-2023],5.6[5-Year])
EISSN	2397-4648
卷号	9 期号:1
DOI	10.1038/s41535-024-00711-w
摘要	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 reveal the presence of an energy gap on the (100) surface of the low-temperature alpha-Bi4I4, providing spectroscopic evidence for the HOTI phase. Conversely, the high-temperature beta-Bi4I4 harbors gapless Dirac fermions 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 alpha-beta structural phase transition. Our findings directly evidence a temperature-induced topological phase transition from WTI to HOTI in Bi4I4, which paves the way to its potential applications at room temperature.
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收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (National Science Foundation of China)["92365204","12274251","62275061"] ; National Natural Science Foundation of China["2022YFA1403100","2022YFA1403200"]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Quantum Science & Technology ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:001380740500001
出版者	NATURE PORTFOLIO
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/408361
专题	物质科学与技术学院物质科学与技术学院_PI研究组_柳仲楷组物质科学与技术学院_特聘教授组_陈宇林
通讯作者	Du, Y.; Zhou, J. J.; Chen, Y. L.; Yang, L. X.
作者单位	1.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing, Peoples R China 2.Beihang Univ, Sch Phys, Beijing, Peoples R China 3.Beihang Univ, Int Res Inst Multidisciplinary Sci, Ctr Quantum & Matter Sci, Beijing, Peoples R China 4.Beijing Inst Technol, Ctr Quantum Phys, Sch Phys, Key Lab Adv Optoelect Quantum Architecture & Measu, Beijing, Peoples R China 5.Beijing Inst Technol, Int Ctr Quantum Mat, Zhuhai 519000, Peoples R China 6.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai, Peoples R China 7.Chinese Acad Sci, Shanghai Sci Res Ctr, Shanghai, Peoples R China 8.ShanghaiTech Lab Topol Phys, Shanghai, Peoples R China 9.Univ Oxford, Dept Phys, Clarendon Lab, Oxford, England 10.Frontier Sci Ctr Quantum Informat, Beijing, Peoples R China 11.Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China
通讯作者单位	物质科学与技术学院; 上海科技大学
推荐引用方式 GB/T 7714	Zhao, W. X.,Yang, M.,Du, X.,et al. Topological phase transition in quasi-one-dimensional bismuth iodide Bi₄I₄[J]. NPJ QUANTUM MATERIALS,2024,9(1).
APA	Zhao, W. X..,Yang, M..,Du, X..,Li, Y. D..,Zhai, K. Y..,...&Yang, L. X..(2024).Topological phase transition in quasi-one-dimensional bismuth iodide Bi₄I₄.NPJ QUANTUM MATERIALS,9(1).
MLA	Zhao, W. X.,et al."Topological phase transition in quasi-one-dimensional bismuth iodide Bi₄I₄".NPJ QUANTUM MATERIALS 9.1(2024).