Coherent Spectroscopy of Multiple Excitons in Colloidal Nanocrystal Quantum Dots

Coherent Spectroscopy of Multiple Excitons in Colloidal Nanocrystal Quantum Dots
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胶体纳米晶量子点中多激子的相干光谱

DOI:
10.1002/cnma.201900218
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发表时间:
2019
期刊:
影响因子:
3.8
通讯作者:
H. Tahara and Y. Kanemitsu
H. Tahara and Y. Kanemitsu
中科院分区:
材料科学4区
文献类型:
--
作者:
山川大路;宮本辰也;岡本博;H. Tahara and Y. Kanemitsu

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对胶体半导体量子点(QD)的深入研究已经过去了三十多年,即使在今天,QD系统中的众多物理效应仍然令人着迷。特别是,多激子及其相干性的使用是一个热门的话题进行调查。我们探索了胶体量子点在下一代光电应用中的潜力。在这里,我们总结了我们最近的研究多激子谐波量子相干在PbS量子点。多重激子相干性可以用我们新开发的瞬态吸收信号锁相干涉检测系统观察到。我们发现,多激子表现出偶极振荡与激子共振频率的整数倍。这种多激子的谐波量子相干性的一个重要的实际特征是它有助于光吸收过程。因此,谐波量子相干是实现先进光电应用的关键。
Over three decades of intense research on colloidal semiconductor nanocrystal quantum dots (QDs) have passed, and the multitude of physical effects in QD systems still makes fascinating discoveries even today. In particular, the use of multiple excitons and their coherence is a hot topic to be investigated. We explore the potential of colloidal QDs for next‐generation optoelectronic applications. Here, we summarize our recent studies on the multiple‐exciton harmonic quantum coherence in PbS QDs. The multiple excitonic coherence can be observed with our newly developed system for phase‐locked interference detection of transient absorption signals. We found that multiple excitons exhibit dipole oscillations with integer multiples of the exciton resonance frequency. An important practical feature of this harmonic quantum coherence of multiple excitons is that it assists photoabsorption processes. Therefore, harmonic quantum coherence is a key to realize advanced optoelectronic applications.
激发引起的位移在半导体相干光学响应中的作用
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