Cavity effect on a biexciton in a CuCl microcavity
Cavity effect on a biexciton in a CuCl microcavity
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CuCl 微腔中双激子的空腔效应
DOI：
10.1103/physrevb.94.115308
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Masaaki Nakayama
中科院分区：
文献类型：
--
作者：
Yasuyoshi Mitsumori;Shimpei Matsuura;Shoichi Uchiyama;Keiichi Edamatsu;and Masaaki Nakayama
研究了平面CuCl微腔中双激子的布居和相干动力学。我们发展了一种时间分辨双光子偏振光谱技术，利用该技术，我们提取了双激子的布居动力学，即使在双激子与下腔极化子光谱重叠的情况下。在弱耦合区观察到的腔双激子寿命远短于无腔的裸CuCL薄膜，这直接证明了腔增强了双激子的辐射衰减率。腔的增强来源于双激子-腔耦合使非束缚双腔极化子态与双激子波函数的杂化。通过比较双激子的布居和相干衰减曲线，我们发现腔双激子的相干性受到辐射布居衰变的限制。
We studied the population and coherence dynamics of a biexciton in a planar CuCl microcavity. We developed a time-resolved two-photon polarization spectroscopy technique, by which we extracted the population dynamics of the biexciton even when the biexciton was spectrally overlapped with the lower cavity polariton. The observed lifetime of the cavity biexciton in the weak-coupling regime was much shorter than that of a bare CuCl thin film without a cavity, which directly demonstrates cavity enhancement of the radiative decay rate of the biexciton. The cavity enhancement originates from the hybridization of the unbound two-cavity-polariton state to the biexciton wave function by the biexciton-cavity coupling. By comparing the population and coherence decay curves of the biexciton, we found that the coherence of the cavity biexciton was limited by the radiative population decay.