4月3日 香港城市大学张哲东教授学术报告：Electronic Coherence of Molecules in Cavities Monitored by Ultrafast Quantum-Light Spectroscopy

报告时间：4月3日下午15：00 

报告地点：唐仲英楼B501

Electronic Coherence of Molecules in Cavities Monitored by Ultrafast Quantum-Light Spectroscopy

Prof. Zhedong Zhang (香港城市大学)

Quantum states of the light, e.g., single photons, entanglement and squeezing, open up a new continent for spectroscopy by utilizing the parameters of quantum optical fields  as novel control knobs and through the variation of photon statistics. With recent advancements of quantum technology and optical cavities, controlling the electron, excitons and phonons in materials can be achieved, towards unprecedented resolution and precision. Polariton condensation, as a new class of matter, has been therefore observed, showing a highly collective and quantum nature emergent from far-from-equilibrium regime. There are two key issues obscured: electron dynamics within mesoscopic scale and strong light-matter interaction. The underlying physics is still an open issue. In this talk, I will present our recent works on multidimensional spectroscopic probes for molecular systems interacting with quantum states of light and microcavities. Several scenarios will be covered: 2D coherent probe, Raman spectra with entangled photons, etc. [1,2]. Microscopic models for molecules using density matrix and Heisenberg-Langevin approach will be discussed, for a unified understanding of the spectroscopic signals as well as polaritons that may demonstrate a phase transition towards condensation [3].

[1] Z. D. Zhang, et al., Phys. Rev. Lett. 130, 103001 (2023).

[2] Z. D. Zhang, et al., Light: Sci. & Appls. 11, 274 (2022).

[3] Z. D. Zhang, et al., Phys. Rev. B 106, L220306 (2022).