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Optical manipulation of the topological phase in ZrTe_(5) revealed by time-and angle-resolved photoemission
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作者 黄超之 徐骋洋 +8 位作者 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 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第1期170-175,共6页
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 st... 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). 展开更多
关键词 time-and angle-resolved photoemission spectroscopy electronic structure topological insulator
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