在 ZnO 中，激子-杂质-声子组态相互作用导致激子和 Fano 共振的形成动力学和时间行为。
Formation dynamics of excitons and temporal behaviors of Fano resonance due to the exciton-impurity-phonon configuration interaction in ZnO.
机构信息
Department of Physics and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
出版信息
J Phys Chem A. 2012 Jan 12;116(1):381-5. doi: 10.1021/jp209919n. Epub 2011 Dec 23.
Formation dynamics of free and neutral donor bound excitons (FX and D(0)X) in a high quality ZnO single crystal are studied by means of time-resolved photoluminescence (TRPL) at various temperatures. At low-temperatures, FX and D(0)X formation times are determined to be ~5 and ~10 ps, respectively, by fitting the rise process with the Boltzmann sigmoidal function. Temporal information of FX- and D(0)X-longitudinal optical (LO) phonon coupling is also acquired by measuring TRPL spectra of the first-order LO phonon-assisted FX and D(0)X transitions. In particular, interesting time evolution of luminescence intensity in the Fano resonance region due to the configuration interaction of exciton-impurity-phonon is explored.
通过在不同温度下进行时间分辨光致发光（TRPL），研究了高质量 ZnO 单晶中自由和中性施主束缚激子（FX 和 D(0)X）的形成动力学。在低温下，通过用玻尔兹曼 sigmoidal 函数拟合上升过程，确定 FX 和 D(0)X 的形成时间分别约为 5 和 10 ps。还通过测量一阶 LO 声子辅助 FX 和 D(0)X 跃迁的 TRPL 光谱，获得了 FX 和 D(0)X-纵光学（LO）声子耦合的时间信息。特别地，由于激子-杂质-声子的组态相互作用，探索了由于 Fano 共振区域的发光强度的有趣时间演化。
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