Monitoring surface charge movement in single elongated semiconductor nanocrystals -: art. no. 167402
Monitoring surface charge movement in single elongated semiconductor nanocrystals -: art. no. 167402
复制标题
DOI：
10.1103/physrevlett.93.167402
复制
发表时间：
2004-10-15
影响因子：
8.6
通讯作者：
Weller, H
中科院分区：
文献类型：
--
作者：
Müller, J;Lupton, JM;Weller, H
我们证明了从单个细长胶体量子点观察到的光谱抖动中激子跃迁的光谱线宽和位置之间的普遍相关性。打破电子和空穴限制的对称性，以及表面电荷扩散的空间方向，使我们能够在微观上跟踪曲折的表面电荷，提供了一种新的探针的粒子的纳米环境。光谱扩散表现出只有一个弱的温度依赖性，这使我们能够揭示在室温下的单粒子均匀线宽为50毫电子伏。
We demonstrate a universal correlation between the spectral linewidth and position of the excitonic transition in the spectral jitter observed from single elongated colloidal quantum dots. Breaking the symmetry of electron and hole confinement as well as of the spatial directions for surface charge diffusion enables us to microscopically track meandering surface charges, providing a novel probe of the particle's nanoenvironment. Spectral diffusion exhibits only a weak temperature dependence, which allows us to uncover the single particle homogeneous linewidth of 50 meV at room temperature.