Optical properties and spin manipulation in dynamic quantum nanostructures formed by surface acoustic waves

我们研究了 GaAs/AlAs 量子阱中表面声波 (SAW) 形成的动态量子纳米结构的光学特性。我们阐明了声表面波压电势以及应变引起的带隙调制对空间和时间分辨光致发光强度及其偏振各向异性的影响。我们还构建了一个空间和时间分辨的克尔旋转测量系统，用于检测 100μm 距离传输过程中的电子自旋动力学。该技术使我们能够确定自旋轨道相互作用的强度，这对于半导体中的电自旋操纵至关重要。

We investigated optical properties of dynamic quantum nanostructures formed by surface acoustic waves (SAWs) in GaAs/AlAs quantum wells. We clarified the effects of the SAW piezoelectric potential as well as those of the strain-induced band-gap modulation on spatially- and time-resolved photoluminescence intensity and its polarization anisotropy. We also constructed a spatially- and time-resolved Kerr rotation measurement system to detect electron spin dynamics during transport over a distance of 100μm. The technique enabled us to determine the strength of spin-orbit interaction, which is essential for the electrical spin manipulation in semiconductors.