Optical manipulation of the topological phase in ZrTe5 revealed by time- and angle-resolved photoemission

doi:10.1088/1674-1056/ad0d9d

中国物理B ›› 2024, Vol. 33 ›› Issue (1): 17901-17901.doi: 10.1088/1674-1056/ad0d9d

所属专题： SPECIAL TOPIC — States and new effects in nonequilibrium

Optical manipulation of the topological phase in ZrTe₅ revealed by time- and angle-resolved photoemission

Chaozhi Huang(黄超之)^1,†, Chengyang Xu(徐骋洋)^1,†, Fengfeng Zhu(朱锋锋)¹, Shaofeng Duan(段绍峰)¹, Jianzhe Liu(刘见喆)¹, Lingxiao Gu(顾凌霄)¹, Shichong Wang(王石崇)¹, Haoran Liu(刘浩然)¹, Dong Qian(钱冬)^1,2,3,‡, Weidong Luo(罗卫东)^1,2,§, and Wentao Zhang(张文涛)^1,2,¶

1 Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
2 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;
3 Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China

收稿日期:2023-10-15 修回日期:2023-11-16 接受日期:2023-11-17 出版日期:2023-12-13 发布日期:2023-12-29
通讯作者: Dong Qian, Weidong Luo, Wentao Zhang E-mail:dqian@sjtu.edu.cn;wdluo@sjtu.edu.cn;wentaozhang@sjtu.edu.cn
基金资助:
W. T. Z. acknowledges support from the National Key R&D Program of China (Grant Nos. 2021YFA1400202 and 2021YFA1401800), the National Natural Science Foundation of China (Grant Nos. 12141404 and 11974243), and the Natural Science Foundation of Shanghai (Grant Nos. 22ZR1479700 and 23XD1422200). S. F. D. acknowledges support from the China Postdoctoral Science Foundation (Grant No. 2022M722108). D.Q. acknowledges support from the National Key R&D Program of China (Grant Nos. 2022YFA1402400 and 2021YFA1400100) and the National Natural Science Foundation of China (Grant No. 12074248).

Optical manipulation of the topological phase in ZrTe₅ revealed by time- and angle-resolved photoemission

1 Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
2 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;
3 Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2023-10-15 Revised:2023-11-16 Accepted:2023-11-17 Online:2023-12-13 Published:2023-12-29
Contact: Dong Qian, Weidong Luo, Wentao Zhang E-mail:dqian@sjtu.edu.cn;wdluo@sjtu.edu.cn;wentaozhang@sjtu.edu.cn
Supported by:
W. T. Z. acknowledges support from the National Key R&D Program of China (Grant Nos. 2021YFA1400202 and 2021YFA1401800), the National Natural Science Foundation of China (Grant Nos. 12141404 and 11974243), and the Natural Science Foundation of Shanghai (Grant Nos. 22ZR1479700 and 23XD1422200). S. F. D. acknowledges support from the China Postdoctoral Science Foundation (Grant No. 2022M722108). D.Q. acknowledges support from the National Key R&D Program of China (Grant Nos. 2022YFA1402400 and 2021YFA1400100) and the National Natural Science Foundation of China (Grant No. 12074248).

1. 附件.pdf(1351KB)

摘要/Abstract

摘要： High-resolution time- and angle-resolved photoemission measurements were conducted on the topological insulator ZrTe₅. With strong femtosecond photoexcitation, a possible ultrafast phase transition from a weak to a strong topological insulating phase was experimentally realized by recovering the energy gap inversion in a time scale that was shorter than 0.15 ps. This photoinduced transient strong topological phase can last longer than 2 ps at the highest excitation fluence studied, and it cannot be attributed to the photoinduced heating of electrons or modification of the conduction band filling. Additionally, the measured unoccupied electronic states are consistent with the first-principles calculation based on experimental crystal lattice constants, which favor a strong topological insulating phase. These findings provide new insights into the longstanding controversy about the strong and weak topological properties in ZrTe₅, and they suggest that many-body effects including electron—electron interactions must be taken into account to understand the equilibrium weak topological insulating phase in ZrTe₅.

关键词: time- and angle-resolved photoemission spectroscopy, electronic structure, topological insulator

Abstract: High-resolution time- and angle-resolved photoemission measurements were conducted on the topological insulator ZrTe₅. With strong femtosecond photoexcitation, a possible ultrafast phase transition from a weak to a strong topological insulating phase was experimentally realized by recovering the energy gap inversion in a time scale that was shorter than 0.15 ps. This photoinduced transient strong topological phase can last longer than 2 ps at the highest excitation fluence studied, and it cannot be attributed to the photoinduced heating of electrons or modification of the conduction band filling. Additionally, the measured unoccupied electronic states are consistent with the first-principles calculation based on experimental crystal lattice constants, which favor a strong topological insulating phase. These findings provide new insights into the longstanding controversy about the strong and weak topological properties in ZrTe₅, and they suggest that many-body effects including electron—electron interactions must be taken into account to understand the equilibrium weak topological insulating phase in ZrTe₅.

Key words: time- and angle-resolved photoemission spectroscopy, electronic structure, topological insulator

中图分类号: (Photoemission and photoelectron spectra)

79.60.-i

74.25.Jb (Electronic structure (photoemission, etc.)) 73.20.At (Surface states, band structure, electron density of states) 78.47.J- (Ultrafast spectroscopy (<1 psec))

Chaozhi Huang(黄超之), Chengyang Xu(徐骋洋), Fengfeng Zhu(朱锋锋), Shaofeng Duan(段绍峰), Jianzhe Liu(刘见喆), Lingxiao Gu(顾凌霄), Shichong Wang(王石崇), Haoran Liu(刘浩然), Dong Qian(钱冬), Weidong Luo(罗卫东), and Wentao Zhang(张文涛). Optical manipulation of the topological phase in ZrTe₅ revealed by time- and angle-resolved photoemission[J]. 中国物理B, 2024, 33(1): 17901-17901.

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Optical manipulation of the topological phase in ZrTe₅ revealed by time- and angle-resolved photoemission

Optical manipulation of the topological phase in ZrTe₅ revealed by time- and angle-resolved photoemission

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