Li Rui, Liu Zhi-Hai, Wu Yidong, Liu C S
Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao, 066004, China.
Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center, Beijing, 100193, China.
Sci Rep. 2018 May 9;8(1):7400. doi: 10.1038/s41598-018-25692-2.
For a nanowire quantum dot with the confining potential modeled by both the infinite and the finite square wells, we obtain exactly the energy spectrum and the wave functions in the strong spin-orbit coupling regime. We find that regardless of how small the well height is, there are at least two bound states in the finite square well: one has the σ [Formula: see text] = -1 symmetry and the other has the σ [Formula: see text] = 1 symmetry. When the well height is slowly tuned from large to small, the position of the maximal probability density of the first excited state moves from the center to x ≠ 0, while the position of the maximal probability density of the ground state is always at the center. A strong enhancement of the spin-orbit effect is demonstrated by tuning the well height. In particular, there exists a critical height [Formula: see text], at which the spin-orbit effect is enhanced to maximal.
对于由无限深方阱和有限深方阱模拟限制势的纳米线量子点，我们精确地得到了强自旋 - 轨道耦合 regime 下的能谱和波函数。我们发现，无论阱高有多小，有限深方阱中至少存在两个束缚态：一个具有σ [公式：见正文] = -1对称性，另一个具有σ [公式：见正文] = 1对称性。当阱高从大到小缓慢调谐时，第一激发态的最大概率密度位置从中心移动到x ≠ 0处，而基态的最大概率密度位置始终在中心。通过调谐阱高证明了自旋 - 轨道效应的强烈增强。特别地，存在一个临界高度 [公式：见正文]，在该高度自旋 - 轨道效应增强到最大。
