Topological phase transition in quasi-one-dimensional bismuth iodide Bi4I4

Abstract Quasi-one-dimensional (quasi-1D) bismuth iodide Bi 4 I 4 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 α-Bi 4 I 4 , providing spectroscopic evidence for the HOTI phase. Conversely, the high-temperature β-Bi 4 I 4 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 α-β structural phase transition. Our findings directly evidence a temperature-induced topological phase transition from WTI to HOTI in Bi 4 I 4 , which paves the way to its potential applications at room temperature.

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Publication Details

Journal
npj Quantum Materials
Published
2024-12-20
DOI
https://doi.org/10.1038/s41535-024-00711-w
Citations
5
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
1.69

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article

Topological phase transition in quasi-one-dimensional bismuth iodide Bi4I4

Yingying Hu, Yidian Li, Jian Zhou, Yi Du et al.
5 citations
npj Quantum Materials
Topological Materials and Phenomena
1.69
article

Topological phase transition in quasi-one-dimensional bismuth iodide Bi4I4

Yingying Hu, Yidian Li, Jian Zhou, Yi Du, Zhongkai Liu, Xian Du, Yuan Bo Huang, Yugui Yao, Ming Yang, Wenxuan Zhao, Jincheng Zhuang, Jifeng Han, Lexian Yang, Yulin Chen, K. Y. Zhai
article en
5 citations

Abstract

Abstract Quasi-one-dimensional (quasi-1D) bismuth iodide Bi 4 I 4 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 α-Bi 4 I 4 , providing spectroscopic evidence for the HOTI phase. Conversely, the high-temperature β-Bi 4 I 4 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 α-β structural phase transition. Our findings directly evidence a temperature-induced topological phase transition from WTI to HOTI in Bi 4 I 4 , which paves the way to its potential applications at room temperature.

npj Quantum MaterialsVol. 9(1)
Beijing Institute of Technology (CN), ShanghaiTech University (CN), University of Oxford (GB), Collaborative Innovation Center of Quantum Matter (CN), Beijing Academy of Quantum Information Sciences (CN), Beihang University (CN), Tsinghua University (CN)
National Natural Science Foundation of China
Affordable and clean energy
Openalex Percentile: Top 15%
Topological Materials and Phenomena
1.69
DOIOpen Access PDFOpenAlex
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