Collective enhancement of quantum coherence in coupled quantum dot films
Collective enhancement of quantum coherence in coupled quantum dot films
复制标题
耦合量子点薄膜中量子相干性的集体增强
DOI：
10.1103/physrevb.104.l241405
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发表时间：
2021
影响因子：
3.7
通讯作者：
and Y. Kanemitsu
中科院分区：
文献类型：
--
作者：
H. Tahara;M. Sakamoto;T. Teranishi;and Y. Kanemitsu
胶体半导体量子点（QDs）是一种在强量子限制系统中提供独特的多电子-空穴对（多激子）光物理特性的有吸引力的材料。多激子现象，如有效俄歇复合，已被深入研究相对于个别量子点。然而，量子点的协同性质，特别是在多激子相干性方面，迄今尚未得到阐明。在这里，我们报告了在耦合QD薄膜中量子相干性的集体增强的观察。利用光电流量子干涉技术，我们发现耦合量子点中的多激子量子相干性比孤立量子点明显增加。这种协同效应是由量子点之间的相干电子耦合引起的。我们的研究结果阐明了耦合量子系统的增强机制，并为先进的光电应用（如相干放大器和频率上变频器）打开了大门。
Colloidal semiconductor quantum dots (QDs) are attractive materials that provide unique photophysics of multiple electron-hole pairs (multiexcitons) in strongly quantum confined systems. Multiexciton phenomena such as efficient Auger recombination have been intensively investigated with respect to individual QDs. However, the cooperative nature of QDs, especially in terms of multiexciton coherence, has not been elucidated thus far. Here, we report the observation of the collective enhancement of quantum coherence in coupled QD films. Using a photocurrent quantum interference technique, we find that the multiexciton quantum coherence in coupled QDs is significantly increased compared to the case of isolated QDs. This cooperative effect is induced by the coherent electronic coupling between QDs. Our results clarify the enhancement mechanism in coupled quantum systems and open the door to advanced optoelectronic applications such as coherent amplifiers and frequency upconverters.
影响因子：
56.9
作者：
Semonin, Octavi E.;Luther, Joseph M.;Beard, Matthew C.
通讯作者：
Beard, Matthew C.
影响因子：
41.2
作者：
Chen O;Zhao J;Chauhan VP;Cui J;Wong C;Harris DK;Wei H;Han HS;Fukumura D;Jain RK;Bawendi MG
通讯作者：
Bawendi MG