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arXiv 1107.4159cond-mat.mes-hall
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球形半导体量子点的量子特性

Quantum properties of spherical semiconductor quantum dots

Baptiste Billaud, T. T. Truong

摘要:

纳米级的量子效应已经在许多受限结构中观察到,特别是在半导体量子点(QD)中。在这项工作中,我们提出了一个理论上的改进,所谓的有效质量近似的有效赝势的引入。这有利地允许在很大程度上进行分析计算,并导致与实验数据更好的一致性。我们已经得到了,作为一个功能的量子点半径,在精确的域的有效性,量子点的基态的能量,其斯塔克和兰姆位移。一个可观察到的兰姆位移是值得注意的预测明智地选择半导体和半径。尽管量子点能谱具有固有的非简并性,我们还是提出了一个基于Casimir效应的Gedanken实验来测试其可观测性。最后,还考虑了电磁腔对半导体量子点的影响,并计算了其Purcell因子。这最后的结果提高了具有在可见光范围内发射的QD激光器的可能性。

英文摘要:

Quantum effects at the nanometric level have been observed in many confined structures, and particularly in semiconductor quantum dots (QDs). In this work, we propose a theoretical improvement of the so-called effective mass approximation with the introduction of an effective pseudo-potential. This advantageously allows analytic calculations to a large extent, and leads to a better agreement with experimental data. We have obtained, as a function of the QD radius, in precise domains of validity, the QD ground state energy, its Stark and Lamb shifts. An observable Lamb shift is notably predicted for judiciously chosen semiconductor and radius. Despite the intrinsic non-degeneracy of the QD energy spectrum, we propose a Gedankenexperiment based on the use of the Casimir effect to test its observability. Finally, the effect of an electromagnetic cavity on semiconductor QDs is also considered, and its Purcell factor evaluated. This last result raises the possibility of having a QD-LASER emitting in the range of visible light.

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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