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Hybridization of electronic states in quantum dots through photon emission

机译：通过光子发射使量子点中的电子态杂化

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The self-assembly of semiconductor quantum dots has opened up new opportunities in photonics. Quantum dots are usually described as 'artificial atoms', because electron and hole confinement gives rise to discrete energy levels. This picture can be justified from the shell structure observed as a quantum dot is filled either with excitons (bound electron-hole pairs) or with electrons. The discrete energy levels have been most spectacularly exploited in single photon sources that use a single quantum dot as emitter. At low temperatures, the artificial atom picture is strengthened by the long coherence times of excitons in quantum dots, motivating the application of quantum dots in quantum optics and quantum information processing. In this context, excitons in quantum dots have already been manipulated coherently. We show here that quantum dots can also possess electronic states that go far beyond the artificial atom model. These states are a coherent hybridization of localized quantum dot states and extended continuum states: they have no analogue in atomic physics. The states are generated by the emission of a photon from a quantum dot. We show how a new version of the Anderson model that describes interactions between localized and extended states can account for the observed hybridization.
机译：半导体量子点的自组装为光子学开辟了新的机会。量子点通常被称为“人造原子”，因为电子和空穴的限制会引起离散的能级。当量子点被激子（束缚的电子-空穴对）或电子充满时，从观察到的壳结构可以证明该图片是正确的。在使用单个量子点作为发射器的单光子源中，离散能级得到了最广泛的利用。在低温下，激子在量子点中的长相干时间增强了人工原子的图像，从而激发了量子点在量子光学和量子信息处理中的应用。在这种情况下，量子点中的激子已经被连贯地操纵。我们在这里表明，量子点还可以拥有远远超出人工原子模型的电子状态。这些状态是局部量子点状态和扩展连续体状态的相干杂交：它们在原子物理学中没有类似物。通过从量子点发射光子来生成状态。我们展示了描述本地化状态和扩展状态之间相互作用的新版本的Anderson模型如何解释观察到的杂交。

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