Topological phase transition in quasi-one-dimensional bismuth iodide Bi 4 I 4
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-re...
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
Nature Research
2024
|
| _version_ | 1824458707172327424 |
|---|---|
| author | Zhao, WX Yang, M Du, X Li, YD Zhai, KY Hu, YQ Han, JF Huang, Y Liu, ZK Yao, YG Zhuang, JC Du, Y Zhou, JJ Chen, YL Yang, LX |
| author_facet | Zhao, WX Yang, M Du, X Li, YD Zhai, KY Hu, YQ Han, JF Huang, Y Liu, ZK Yao, YG Zhuang, JC Du, Y Zhou, JJ Chen, YL Yang, LX |
| author_sort | Zhao, WX |
| collection | OXFORD |
| description | 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 α-Bi4I4, providing spectroscopic evidence for the HOTI phase. Conversely, the high-temperature β-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 α-β 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. |
| first_indexed | 2025-02-19T04:30:10Z |
| format | Journal article |
| id | oxford-uuid:87da21d1-d84f-4a9d-acee-94f4e96d9506 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2025-02-19T04:30:10Z |
| publishDate | 2024 |
| publisher | Nature Research |
| record_format | dspace |
| spelling | oxford-uuid:87da21d1-d84f-4a9d-acee-94f4e96d95062024-12-20T20:08:09ZTopological phase transition in quasi-one-dimensional bismuth iodide Bi 4 I 4Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:87da21d1-d84f-4a9d-acee-94f4e96d9506EnglishJisc Publications RouterNature Research2024Zhao, WXYang, MDu, XLi, YDZhai, KYHu, YQHan, JFHuang, YLiu, ZKYao, YGZhuang, JCDu, YZhou, JJChen, YLYang, LXQuasi-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 α-Bi4I4, providing spectroscopic evidence for the HOTI phase. Conversely, the high-temperature β-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 α-β 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. |
| spellingShingle | Zhao, WX Yang, M Du, X Li, YD Zhai, KY Hu, YQ Han, JF Huang, Y Liu, ZK Yao, YG Zhuang, JC Du, Y Zhou, JJ Chen, YL Yang, LX Topological phase transition in quasi-one-dimensional bismuth iodide Bi 4 I 4 |
| title | Topological phase transition in quasi-one-dimensional bismuth iodide Bi 4 I 4 |
| title_full | Topological phase transition in quasi-one-dimensional bismuth iodide Bi 4 I 4 |
| title_fullStr | Topological phase transition in quasi-one-dimensional bismuth iodide Bi 4 I 4 |
| title_full_unstemmed | Topological phase transition in quasi-one-dimensional bismuth iodide Bi 4 I 4 |
| title_short | Topological phase transition in quasi-one-dimensional bismuth iodide Bi 4 I 4 |
| title_sort | topological phase transition in quasi one dimensional bismuth iodide bi 4 i 4 |
| work_keys_str_mv | AT zhaowx topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT yangm topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT dux topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT liyd topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT zhaiky topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT huyq topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT hanjf topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT huangy topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT liuzk topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT yaoyg topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT zhuangjc topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT duy topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT zhoujj topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT chenyl topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 AT yanglx topologicalphasetransitioninquasionedimensionalbismuthiodidebi4i4 |