Second-Order Correlation Function for Asymmetric-to-Symmetric Transitions due to Spectrally Indistinguishable Biexciton Cascade Emission
Second-Order Correlation Function for Asymmetric-to-Symmetric Transitions due to Spectrally Indistinguishable Biexciton Cascade Emission
复制标题
由于光谱不可区分的双激子级联发射导致不对称到对称转变的二阶相关函数
DOI：
10.1088/0256-307x/32/12/124204
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发表时间：
2015
影响因子：
3.5
通讯作者：
Sun Bao-Quan
中科院分区：
文献类型：
--
作者：
Zhu Hai-Jun;Jiang De-Sheng;Zhao Cui-Lan;Sun Bao-Quan
在连续波激发下，利用二阶相关函数g（2）（τ）测量了单量子点中零时延双激子级联发光的光子聚束统计.结果表明，当双激子结合能从0.59 meV变化到接近零时，聚束现象与双激子结合能无关。当激子光子与双激子光子在光谱上不可区分时，光子聚束发生，并且它们中的任何一个都可以触发Hanbury-Brown和Twiss设置中的“开始”。然而，如果激子能量在光谱上可与双激子区分，光子统计将变得不对称，并且可以获得交叉聚束线形。基于三能级速率方程分析模型的理论计算与g（2）（τ）相关函数的测量结果一致。
We report the observed photon bunching statistics of biexciton cascade emission at zero time delay in single quantum dots by second-order correlation function g(2)(τ) measurements under continuous wave excitation. It is found that the bunching phenomenon is independent of the biexciton binding energy when it varies from 0.59 meV to nearly zero. The photon bunching takes place when the exciton photon is not spectrally distinguishable from the biexciton photon, and either of them can trigger the ‘start’ in a Hanbury–Brown and Twiss setup. However, if the exciton energy is spectrally distinguishable from the biexciton, the photon statistics will become asymmetric and a cross-bunching lineshape can be obtained. The theoretical calculations based on a model of three-level rate-equation analysis are consistent with the result of g(2) (τ) correlation function measurements.