Single artificial atom photonic crystal nanocavity laser

本研究的目的是首次使用具有气桥结构的高质量二维光子晶体纳米腔实现单半导体量子点激光器。我们第一次成功地进行了示威。这种单量子点激光器可以称为单人工原子激光器，因为量子点是一个人工原子。真空拉比分裂是光致发光光谱中的一种光谱分裂，当单个量子点中的激子与纳米腔中的单个光子相互作用时，可以观察到真空拉比分裂。在固态材料中，这种强耦合系统中激光的研究尚未见报道。我们首次在这种强耦合系统中实现了激光。真空拉比分裂在激光阈值处持续存在，表明可逆和不可逆物理过程同时存在。这一成果可以说是半导体激光器领域的重要里程碑之一。因此，这篇文章发表在Nature Physics上，影响因子非常高，并被多家报纸报道。从强耦合到激光的跃迁发生在单量子能级。因此，这是迈向具有大量量子的固态腔量子电实验的第一步。

The objective of research is the first demonstration of single semiconductor quantum dot laser using a high quality two-dimensional photonic crystal nanocavity with air-bridge structure.We have succeeded in the demonstration for the first time. This single quantum dot laser can be called as a single artificial atom laser, because a quantum dot is an artificial atom. Vacuum Rabi splitting, which is a spectral splitting in photoluminescence spectrum, can be observed when an exciton in a single quantum dot interacts with single photon in a nanocavity. There was no report on lasing in such a strongly coupled system in solid-state material. We have achieved lasing in this strongly coupled system for the first time. Moreover, the vacuum Rabi splitting is sustained at the laser threshold, which indicates that coexistence of reversible and irreversible physical processes at the same time.This achievement can be said as one of the important mile stones in the field of semiconductor lasers. Therefore, this article was published by Nature Physics, which has a very high impact factor, and was reported by several newspapers. The transition from the strong-coupling to lasing regime occurs with single-quantum-level. Therefore, this is the first step towards solid-state cavity quantum electric experiments with large number of quanta.