论文标题
单量子点系统中的第三稳定分支和核自旋极化的三位化性
Third Stable Branch and Tristability of Nuclear Spin Polarization in Single Quantum Dot System
论文作者
论文摘要
半导体量子点通过增强的超精细相互作用提供了电子和核的自旋耦合系统。我们表明，单个量子点中的核自旋极化可以在纵向磁场下具有三个稳定的分支。状态伴随着每个分支边界周围的磁滞循环，并在激发条件下发生了变化。为了解释这些发现，我们将由于核自旋波动引起的电子自旋松弛纳入了先前研究的动态核自旋极化机制。该模型重现了核自旋极化的新特征以及观察到的电子自旋极化中相关的强大降低，并且可以指核自旋极化的可替代性。
Semiconductor quantum dots provide a spin-coupled system of an electron and nuclei via enhanced hyperfine interaction. We showed that the nuclear spin polarization in single quantum dots can have three stable branches under a longitudinal magnetic field. The states were accompanied by hysteresis loops around the boundaries of each branch with a change in the excitation condition. To explain these findings, we incorporated the electron spin relaxation caused by the nuclear spin fluctuation into the previously-studied dynamic nuclear spin polarization mechanism. The model reproduces the new features of nuclear spin polarization and the associated strong reduction in the observed electron spin polarization, and can refer to the tristability of nuclear spin polarization.
