Laboratory of Physics of Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
Phys Rev Lett. 2011 Jun 3;106(22):227402. doi: 10.1103/PhysRevLett.106.227402. Epub 2011 Jun 1.
We demonstrate that the emission characteristics of site-controlled InGaAs/GaAs single quantum dots embedded in photonic crystal slab cavities correspond to single confined excitons coupled to cavity modes, unlike previous reports of similar systems based on self-assembled quantum dots. By using polarization-resolved photoluminescence spectroscopy at different temperatures and a theoretical model, we show that the exciton-cavity interaction range is limited to the phonon sidebands. Photon-correlation and pump-power dependence experiments under nonresonant excitation conditions further establish that the cavity is fed only by a single exciton.
我们证明了嵌入在光子晶体平板腔中的局域化 InGaAs/GaAs 单量子点的发射特性对应于与腔模耦合的单个受限激子，这与以前基于自组装量子点的类似系统的报告不同。通过在不同温度下使用偏振分辨光致发光光谱和理论模型，我们表明激子-腔相互作用范围限于声子边带。在非共振激发条件下的光子相关和泵浦功率依赖实验进一步证实，腔仅由单个激子提供。
