摘要
High-resolution time-and angle-resolved photoemission measurements were conducted on the topological insulator ZrTe_(5).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 ZrTe_(5),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 ZrTe_(5).
作者
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
Chaozhi Huang;Chengyang Xu;Fengfeng Zhu;Shaofeng Duan;Jianzhe Liu;Lingxiao Gu;Shichong Wang;Haoran Liu;Dong Qian;Weidong Luo;Wentao Zhang(Key Laboratory of Artificial Structures and Quantum Control,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)
基金
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)
the Natural Science Foundation of Shanghai(Grant Nos.22ZR1479700 and 23XD1422200)
support from the China Postdoctoral Science Foundation(Grant No.2022M722108)
support from the National Key R&D Program of China(Grant Nos.2022YFA1402400 and 2021YFA1400100)
the National Natural Science Foundation of China(Grant No.12074248)。
