首页|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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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 experi-mental 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.

time-and angle-resolved photoemission spectroscopyelectronic structuretopological insulator

黄超之、徐骋洋、朱锋锋、段绍峰、刘见喆、顾凌霄、王石崇、刘浩然、钱冬、罗卫东、张文涛

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Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China

Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China

National Key R&D Program of ChinaNational Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of ShanghaiNatural Science Foundation of ShanghaiChina Postdoctoral Science FoundationNational Key R&D Program of ChinaNational Key R&D Program of ChinaNational Natural Science Foundation of China

2021YFA14002022021YFA 1401800121414041197424322ZR147970023XD14222002022M7221082022YFA14024002021 YFA 140010012074248

2024

10.1088/1674-1056/ad0d9d

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(1)
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