考虑Rashba效应自组织量子点中极化子性质

在对半导体量子点的研究中考虑自旋一轨道相互作用对极化子基态能量的影响．采用LLP变分的方法研究了电子一声子相互作用．结果表明声子对极化子基态能量起了很重要的作用，而且由于极化子分裂能对极化子基态能量的贡献很大，故在量子点中研究极化子性质时不可忽略极化子分裂能的影响．自旋分裂能随动量增加呈抛物线型增加．随Rashba自旋轨道耦合常数的增加极化子基态能量表现为增加和减少两种截然相反的情况，而两个分裂态中自旋向下的能态更稳定．Rashba效应不可忽略．

Polaron's Properties in Self-organization Quantum Dots by Influenced of Rashba Spin-orbit Interaction

Influence of Rashba spin - orbit interaction in InAs/GaAs self - organization quantum dot is investigated by considering the Rashba spin - orbit interaction with intermediate coupling method. Our numeriaul results show that the Rashba spin - orbit interaction have more effect to polaron＇ s ground state energy. The electron vector dependence of the ratio of spin - orbit interac- tion to the total ground state energy or other energy composition is obvious and the splitting energy has the same magnitude as the contribution of the polaron, so it can not be neglected. One can see that even without any external magnetic field, the ground state energy can be split by the Rashba spin- orbit interaction, and this split is not a single but a complex one. Since the present of the phonons, whose energy gives negative contribution to the polaron＇s, the spin- splitting states of the polaron are more stable than electron＇ s. Rashba interaction can not be neglected.