Hole-hole and electron-hole exchange interactions in single InAs/GaAs quantum dots
Hole-hole and electron-hole exchange interactions in single InAs/GaAs quantum dots
复制标题
单 InAs/GaAs 量子点中的空穴-空穴和电子-空穴交换相互作用
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
D. Bimberg
中科院分区：
文献类型：
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作者：
T. Warming;E. Siebert;A. Schliwa;E. Stock;R. Zimmermann;D. Bimberg
对同一单个量子点(QD)的微光致发光($EnsureMath{Mu}Ext{Pl}$)和微光致发光激发($EnsureMath{Mu}Ext{PLE}$)光谱的联合分析使我们能够明确地识别在正三子跃迁$({h}_{0}Ensureath{0})上检测到的激发光谱中的四个尖锐共振
Ightarrow}{e}_{0}{h}_{0}{h}_{1})$，揭示了热三中子的完整精细结构。观察到纯自旋态之间的光学跃迁通常被(自旋)选择规则所禁止的跃迁。所有三重态的分裂都是大的(高达3 meV)、不对称的，并且依赖于量子点的大小和形状。在八能带理论和组态相互作用方法的框架下，实验数据与理论计算符合得很好。为了解释导致观测到的精细结构分裂的物理效应，连续省略了复杂模型的部分内容。这种方法确定了各向异性空穴-空穴交换相互作用以及主导观测到的热三子精细结构分裂的关联效应。
A combined analysis of microphotoluminescence ($ensuremath{mu} ext{PL}$) and microphotoluminescence excitation ($ensuremath{mu} ext{PLE}$) spectra of the same single quantum dot (QD) enables an unambiguous identification of four sharp resonances in the excitation spectrum detected on the positive trion transition $({h}_{0}ensuremath{
ightarrow}{e}_{0}{h}_{0}{h}_{1})$ and reveals the complete fine structure of the hot trion. Transitions into states normally forbidden by (spin) selection rules for optical transitions between pure spin states are observed. The splittings of all triplet states are found to be large (up to 3 meV), asymmetric, and QD size and shape dependent. The experimental data are in excellent agreement with theoretical calculations in the framework of eight-band $mathbf{k}ensuremath{cdot}mathbf{p}$ theory and the configuration-interaction method. To account for the physical effects which lead to the observed fine-structure splitting, parts of the complex model are successively omitted. This approach identifies the anisotropic hole-hole exchange interaction as well as correlation effects dominating the observed fine-structure splitting of the hot trion.