比克西顿
去相
激发
激子
量子点
激发态
人口
原子物理学
双光子激发显微术
物理
凝聚态物理
光电子学
量子力学
人口学
社会学
作者
Kohei Kawamura,Tomoharu Yoshida,Jun Ishihara,Akira Ishikawa,Kensuke Miyajima
标识
DOI:10.1088/1361-648x/ad636c
摘要
Abstract We studied the threshold temperature of superfluorescence (SF) generation with regard to biexcitons in CuCl quantum dots (QDs) under resonant two-photon excitation of biexcitons and resonant excitation of excitons to demonstrate the influence of initial population densities in the QDs on SF generation. As a result, the threshold temperature under the resonant excitation of excitons was higher than that under the two-photon excitation of biexcitons. This indicates that the high density of excited dots facilitates the rapid establishment of coherence among the dots, overcoming disadvantages of incomplete population inversion and formation process of biexcitons. We performed a theoretical calculation of the time profiles of the biexcitonic emission based on semiconductor luminescence equations. The experimentally obtained temperature dependence of the time profiles was qualitatively reproduced by calculating their dependence on the dephasing rate. In addition, we estimated the temperature dependence of the phase relaxation time of the biexcitons in the CuCl QDs by analyzing the temperature dependence of SF.
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