报告题目：High Pressure Ultrafast Dynamics of LaH_10±δ and La₃Ni₂O₇ and Emergent Quantum State in 1T-TaS₂

报 告 人：赵继民 研究员（中国科学院物理研究所）

报告时间：2026年8月13日上午10:30

报告地点：物理楼W105会议室

内容摘要：I will present our recent works on high-pressure ultrafast spectroscopy. We innovated an on-site in situ high pressure pump-probe ultrafast spectroscopy instrument [1,2], which enables precise measurements of both the amplitudes and lifetimes, featuring independent tuning and precise control of pressure and temperature at low and varying temperatures. Using this instrument, we found pressure-induced phonon-bottleneck effect [3]. Further, we have achieved time-resolved low temperature ultrafast spectroscopy of LaH_10±δ under an ultrahigh pressure [4]. This first ultrafast dynamics investigation of superhydrides provides direct experimental evidence that strong EPC is responsible for the near-room-temperature superconductivity in clathrate superhydrides. Significantly, we have experimental detected the ultrafast dynamics of pressurized nickelate superconductor La₃Ni₂O₇, revealing relatively strong EPC and precisely measuring its superconducting gap [5]. Finally, our high-precision ultrafast collective dynamic measurements uncover an emergent quantum state in the CDW material 1T-TaS₂ below 65 K [6].

[1] Y. L. Wu, Jimin Zhao, et al., Rev. Sci. Instrum. 92, 113002 (2021).

[2] Jiazila Hasaien, Jimin Zhao, et al., Rev. Sci. Instrum. 96, 013004 (2025).

[3] Y. L. Wu, Jimin Zhao, et al., Chin. Phys. Lett. (Express Letter) 37, 047801 (2020).

[4] Y. L. Wu, Jimin Zhao, et al., Nat. Commun. 15, 9683 (2024).

[5] Y. N. Zhai, Jimin Zhao, et al., Unpublished (2026).

[6] Jiazila Hasaien, Jimin Zhao, et al., PNAS 122, e2406464122 (2025).

报告人简介：Professor Jimin Zhao, Optica Fellow, serves as full professor and group leader at the Institute of Physics, CAS. He earned his B.S. and M.S. from Tsinghua University and Ph.D. from the University of Michigan (Ann Arbor). His research interest focuses on ultrafast spectroscopy and dynamics of correlated quantum materials. He has innovated on-site in situ high-pressure ultrafast spectroscopy, investigated ultrafast dynamics of superconductors, charge density waves, topological quantum states, etc. He serves on the Academic Committee of Light Scattering, CPS, and as Vice Chair of Optica’s Ultrafast Phenomena Technical Group. He leads major national research programs, including the National Key R&D Program, NSFC Key Project and CAS Interdisciplinary Innovation Team.