论文标题
可调纳米线量子点发射器的相关电流和结构研究
Correlated electro-optical and structural study of electrically tunable nanowire quantum dot emitters
论文作者
论文摘要
插入半导体纳米线的量子点是制造单光子设备的有前途的平台。但是，很难完全理解此类量子对象的电光行为，而没有对同一纳米线上结构和光学特性的研究。在这项工作中，我们研究了通过应用外部偏置在gan纳米线中单个量子点排放的光谱可调节性。将纳米线分散并在电子束透明的SI3N4膜上接触，因此可以在同一标本上执行透射电子显微镜观测，光电流和微型发光测量。当外部电场补偿或增强自发性和压电极化产生的内部电场时，单点蓝色或红色的发射会发射。对在327.5 nm和307.5 nm处发射的两个纳米线标本的详细研究分别以20 meV/v的速率显示了光谱变化。理论计算通过建模来促进
Quantum dots inserted in semiconducting nanowires are a promising platform for the fabrication of single photon devices. However, it is difficult to fully comprehend the electro-optical behaviour of such quantum objects without correlated studies of the structural and optical properties on the same nanowire. In this work, we study the spectral tunability of the emission of a single quantum dot in a GaN nanowire by applying external bias. The nanowires are dispersed and contacted on electron beam transparent Si3N4 membranes, so that transmission electron microscopy observations, photocurrent and micro-photoluminescence measurements under bias can be performed on the same specimen. The emission from a single dot blue or red shifts when the external electric field compensates or enhances the internal electric field generated by the spontaneous and piezoelectric polarization. A detailed study of two nanowire specimens emitting at 327.5 nm and 307.5 nm shows spectral shifts at rates of 20 and 12 meV/V, respectively. Theoretical calculations facilitated by the modelling of the
