Direct measurement of spin dynamics in InAs/GaAs quantum dots using time-resolved resonance fluorescence
Direct measurement of spin dynamics in InAs/GaAs quantum dots using time-resolved resonance fluorescence
复制标题
DOI：
10.1103/physrevb.81.035332
复制
发表时间：
2010-01-01
影响因子：
3.7
通讯作者：
Atatuere, M.
中科院分区：
文献类型：
--
作者：
Lu, C. -Y.;Zhao, Y.;Atatuere, M.
我们暂时解析了限制在单个自组装量子点中的电子自旋的共振荧光，以直接测量自旋的光学初始化和 4 K 下的自然弛豫时间尺度。我们的测量表明，当激光共振驱动量子点跃迁时，自旋初始化发生在法拉第配置中的微秒量级。我们表明，在 0.6 T 外磁场下，介导光致自旋翻转的机制从电子-核相互作用转变为空穴混合相互作用。自旋弛豫测量结果的时间约为毫秒，表明由于自旋轨道耦合，B-5 磁场依赖性一直持续到 2.2 T。
We temporally resolve the resonance fluorescence from an electron spin confined to a single self-assembled quantum dot to measure directly the spin's optical initialization and natural relaxation time scales at 4 K. Our measurements demonstrate that spin initialization occurs on the order of microseconds in the Faraday configuration when a laser resonantly drives the quantum dot transition. We show that the mechanism mediating the optically induced spin-flip changes from electron-nuclei interaction to hole-mixing interaction at 0.6 T external magnetic field. Spin relaxation measurements result in times on the order of milliseconds and suggest that a B-5 magnetic field dependence, due to spin-orbit coupling, is sustained all the way down to 2.2 T.