学术讲座
报告题目：探索二维半导体中的强耦合机制
报告时间：2021-11-04 14:30
报 告 人：刘晓泽 教授，武汉大学物理科学与技术学院
报告地点：翔安校区能源材料大楼3号楼会议室3（线下会场）
思明校区卢嘉锡楼202报告厅（同步转播）
摘要：
The strong light-matter coupling is at the core of cavity quantum electrodynamics (CQED), which leads to discoveries of quantum optics in solid-state systems, such as Bose-Einstein condensation¬ and photon blockade. Under the strong coupling regime in semiconductor cavities, the “marriage” of light (i.e., photon) and matter (i.e., exciton) leads to the formation of hybrid quasiparticles called exciton-polaritons with unprecedented physical properties. Two-dimensional (2D) semiconductors, i.e., transition metal dichalcogenides (TMD) monolayers as outstanding excitonic materials, demonstrate great potential to break the limitations of conventional quantum well systems for solid state CQED. In the last few years, exciton polaritons in TMD monolayers have become an emerging research topic since their realization at room temperature1. For large excitonic binding energies, TMD monolayers demonstrate the robustness and tunability of the coherent light-matter coupling in exciton-polaritons from low temperature throughout room temperature2. Moreover, 2D exciton polaritons in TMD monolayers also show unexplored nonlinear optics with quite distinct quantum electrodynamics based on valley excitonic physics, which has been hardly shown in other polaritonic systems3. Furthermore, 2D exciton polaritons could also lead to nonlinear valley phonon scattering4. In a plasmonic cavity strongly coupled with a TMD monolayer, the phonon scattering is equipped with valley degree of freedom and boosted with superlinear enhancement to a stimulated regime, as revealed by Raman spectroscopy and a theoretical model4. The valley polarization is drastically enhanced and sustained throughout the stimulated regime, suggesting a coherent scattering process enabled by the strong coupling of exciton polaritons. These research progresses indicate a great potential for the 2D exciton polariton research in solid state CQED.
报告人简介：
刘晓泽教授，武汉大学物理科学与技术学院博士生导师。主要研究内容是人工微结构中光和低维半导体耦合的腔量子电动力学及其应用。研究的半导体包括二维半导体、低维钙钛矿半导体和有机无机复合半导体等。结合这些半导体，在光场相干调控、非线性光学和玻色子凝聚态等方面的量子光学和光电应用开展了较为系统深入的研究。多次以第一作者在Nature Materials, Nature Photonics, Phys. Rev. Lett., PNAS, Nano Lett.等期刊上发表过研究成果。课题组目前承担国家自然科学基金委、科技部以及中央高校基本科研业务费的科研项目。
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