Hidden Symmetry, Excitonic Transitions and Two-Dimensional Kane's Exciton in the Quantum Well

Experimental realization of purely excitonic lasing in ZnO microcrystals at room temperature: transition from exciton-exciton to exciton-electron scattering

Since the seminal observation of room-temperature laser emission from ZnO thin films and nanowires, numerous attempts have been carried out for detailed understanding of the lasing mechanism in ZnO. In spite of the extensive efforts performed over the last decades, the origin of optical gain at room temperature is still a matter of considerable discussion,. We show that ZnO microcrystals with a size of a few micrometers exhibit purely excitonic lasing at room temperature without showing any symptoms of electron-hole plasma emission. We then present the distinct experimental evidence that the r…

泵浦激子系统中的时间分辨角分辨光电子能谱：激子场诱导的弗洛凯物理

Time-resolved ARPES in pumped excitonic systems: Floquet physics induced by excitonic fields

研究泵浦激子系统的TR-ARPES，基于DPOA理论框架，考虑库仑相互作用，分析平衡与非平衡状态下的相图及边带情况，证实相关实验观察，确立DPOA为模拟相互作用电子系统超快现象的有效准确方法。

Backscattering of light by a finite two-dimensional plate in the region of excitonic absorption

It is shown that the light scattered by a finite 2D crystal strip in the region of an exciton resonance should display strong backscattering. This phenomenon is related to the exciton reflection from the edge of the strip.

Microscopic measurement of photon echo formation in groups of individual excitonic transitions

The third-order polarization emitted from groups of individual localized excitonic transitions after pulsed optical excitation is measured. We observe the evolution of the nonlinear response from the case of a free polarization decay for a single transition, to that of a photon echo for many transitions. The echo is shown to arise from the mutual rephasing of the emission from individual transitions.