Carrier-transfer dynamics between neutral and charged excitonic states in a single quantum dot probed with second-order photon correlation measurements
Carrier-transfer dynamics between neutral and charged excitonic states in a single quantum dot probed with second-order photon correlation measurements
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通过二阶光子相关测量探测单个量子点中中性和带电激子态之间的载流子转移动力学
DOI：
10.1103/physrevb.88.045324
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发表时间：
2013
影响因子：
3.7
通讯作者：
末宗幾夫
中科院分区：
文献类型：
--
作者：
中島秀朗;熊野英和;飯島仁史;小田島聡;末宗幾夫
我们报告了基于二阶光子相关测量的单InAs量子点（QD）中的载流子转移动力学的全面研究。实验得到的自相关函数和互相关函数以及光致发光强度，在一系列具有共同激发的速率方程和单载流子捕获/逃逸到量子点的速率的基础上得到了成功的解释。这种方法使我们能够理解在不同激发条件下形成的单量子量子点中量子二能级系统稳定性的载流子转移动力学。我们澄清了在准共振激发下，中性和带电激子态之间的跃迁被抑制了一个数量级。
We report a comprehensive investigation of carrier-transfer dynamics in a single InAs quantum dot (QD) based on second-order photon correlation measurements. The experimentally obtained auto and crosscorrelation functions as well as photoluminescence intensities are successfully explained on the basis of a series of rate equations with common excitation and also single-carrier-capture/escape rates to/from a QD. This approach enables us to understand the carrier-transfer dynamics responsible for the stability of a quantum two-level system formed in a single QD under various excitation conditions. We clarify that the transition between neutral and charged excitonic states is suppressed by one order of magnitude under quasiresonant excitation.