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【摘要】

High-resolution angle-resolved photoemission spectroscopy (HR-ARPES) and time-resolved ARPES (Tr-ARPES) are powerful tools for studying quantum materials, providing insights into their static and dynamic electronic structures. This seminar will include an overview of the construction and optimization of Tr-ARPES systems, featuring a high-power setup that integrates high-harmonic generation (HHG) and femtosecond lasers, enabling femtosecond temporal resolution and high photon flux for ultrafast electronic dynamics studies.

Applications of HR-ARPES and Tr-ARPES will also be presented, including investigations into interlayer-coupling-driven three-dimensional charge density wave behavior in CuTe, nonthermal electron dynamics in single-crystal graphite, and orbital-dependent interactions in 1T-TiSe₂. The study on TiSe₂ reveals the interplay of electron-phonon coupling and excitonic condensation in stabilizing its charge density wave phase, providing real-time insights into quantum phase transitions and many-body interactions.

By integrating the high precision of HR-ARPES with the ultrafast capabilities of Tr-ARPES, these systems bridge equilibrium and non-equilibrium studies, contributing to a deeper understanding of quantum materials and enabling new approaches in condensed matter research.

References
[1] Ping-Hui Lin, et al, Synchrotron Radiation News, 1–6. (2024)
[2] Hao-Hsiang Jia, et al, Rev. Sci. Instrum. 94, 055106 (2023)
[3] Nguyen Nhat Quyen, et al, Nat. Comm. 15, 2386 (2024)