标题： 量子点中电离杂质束缚激子的精细结构分裂减小 显示英文标题

标题： Fine-structure splitting reduction of ionized impurity bound exciton in quantum dot

摘要： 离子化浅施主杂质激子复合体在量子点中的基态能量和精细结构分裂被研究。 发现由于激子包络函数的各向异性形状显著改变，中心偏移的离子化杂质可以大大减少精细结构分裂。 讨论了由于离子化杂质产生的局部电场导致的基态能量的异常斯塔克位移以及通过外部电场对精细结构分裂的有效调节。 该方案可能有助于基于量子点的纠缠光子源的设计。 显示英文摘要

摘要： The ground-state energy and fine-structure splitting of ionized shallow donor impurity-exciton complex in quantum dots are investigated. It is found that fine-structure splitting could be largely reduced by the off-center ionized impurities since the anisotropic shape of exciton envelope function is significantly changed. Anomalous Stark shifts of the ground-state energy and efficient tuning of the fine-structure splitting by the external electric field due to the local electric field produced by the ionized impurities are discussed. The scheme may be useful for the design of the quantum dots-based entangled-photon source.