Model expressions for the spin-orbit interaction and phonon-mediated spin dynamics in quantum dots
Model expressions for the spin-orbit interaction and phonon-mediated spin dynamics in quantum dots
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DOI：
10.1088/1361-6641/aa995d
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发表时间：
2018-07
影响因子：
1.9
通讯作者：
M. Vaughan;J. Rorison
中科院分区：
文献类型：
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作者：
M. Vaughan;J. Rorison
给出了量子点中自旋-轨道相互作用的模型表达式。由此得到的形式没有忽略三次项，并允许广义的结构反转不对称。我们还得到了电子-声子相互作用态之间耦合的解析表达式，并利用这些解析表达式导出了自旋弛豫率，它在性质上与文献中其他地方得到的结果相似。我们发现，由于包含三次项，对于球点，Dresselhaus对基态自旋弛豫的贡献消失了。与前人的理论和已有的实验结果进行了比较，结果吻合较好，从而为今后的发展提供了一个清晰的分析形式。给出了潜在材料的对比计算。
Model expressions for the spin-orbit interaction in a quantum dot are obtained. The resulting form does not neglect cubic terms and allows for a generalized structural inversion asymmetry. We also obtain analytical expressions for the coupling between states for the electron–phonon interaction and use these to derive spin-relaxation rates, which are found to be qualitatively similar to those derived elsewhere in the literature. We find that, due to the inclusion of cubic terms, the Dresselhaus contribution to the ground state spin relaxation disappears for spherical dots. A comparison with previous theory and existing experimental results shows good agreement thereby presenting a clear analytical formalism for future developments. Comparative calculations for potential materials are presented.