论文标题
自组装的量子点中的孔自旋叉过渡
Hole spin-flip transitions in a self-assembled quantum dot
论文作者
论文摘要
在这项工作中，我们研究了单个自组装/GAAS量子点中的孔自旋转变。我们发现使用8频段$ kp $模型的孔波函数，并计算了地面Zeeman Doublet的声子辅助自旋松弛率。我们系统地研究了各种混合和直接自旋 - 音波机制的重要性，从而导致过渡速率。我们表明，双轴和剪切菌株构成了主要的自旋粘合耦合机制。然后，我们证明，如果量子点被应变层覆盖，则可以增加孔自旋寿命。最后，我们证明自旋松弛可以通过有效的模型来描述。
In this work, we investigate hole spin-flip transitions in a single self-assembled InGaAs/GaAs quantum dot. We find the hole wave functions using the 8-band $kp$ model and calculate phonon-assisted spin relaxation rates for the ground-state Zeeman doublet. We systematically study the importance of various admixture- and direct spin-phonon mechanisms giving rise to the transition rates. We show that the biaxial and shear strain constitute dominant spin-admixture coupling mechanisms. Then, we demonstrate that hole spin lifetime can be increased if a quantum dot is covered by a strain-reducing layer. Finally, we show that the spin relaxation can be described by an effective model.
