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arXiv 1401.6099cond-mat.mes-hallphysics.comp-ph
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[110]-倾斜InAs/GaAs量子点堆的电子和光学性质

Electronic and Optical Properties of [110]-Tilted InAs/GaAs Quantum Dot Stacks

Muhammad Usman

摘要:

利用数百万个原子的模拟研究了[110]倾斜量子点叠层的应变分布、电子结构和偏振分辨光学模式随叠层角的变化。我们的计算揭示了高度不对称的双轴应变分布的倾斜量子点,强烈影响孔波函数的限制,从而控制偏振响应。偏振度的计算值与现有的实验数据很好地吻合,预测了倾斜量子点的独特性质,即各向同性偏振响应可以从[110]和[-110]劈裂边缘$-$实现,这是传统[001]-量子点无法实现的特征。对极坐标图的详细研究进一步证实,倾斜量子点提供了一个额外的旋钮来微调它们的偏振特性。

英文摘要:

Multi-million atom simulations are performed to study stacking-angle ($θ$) dependent strain profiles, electronic structure, and polarization-resolved optical modes from [110]-tilted quantum dot stacks (QDSs). Our calculations reveal highly asymmetrical biaxial strain distributions for the tilted QDSs that strongly influence the confinements of hole wave functions and thereby control the polarization response. The calculated values of degree of polarizations, in good agreement with the available experimental data, predict a unique property of the tilted QDSs that the isotropic polarization response can be realized from both [110] and [-110] cleaved-edges $-$ a feature inaccessible from the conventional [001]-QDSs. Detailed investigations of polar plots further establish that tilting the QDSs provides an additional knob to fine tune their polarization properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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