A single photoexcited electron–hole pair within a polar semiconductor nanocrystal (SNC) alters the charge screening and shielding within it. Perturbations of the crystal lattice and of the valence and conduction bands result, and the quantum-confinement states in a SNC shift uniquely with a dependence on the states occupied by the carriers. This shifting is termed quantum-state renormalization (QSR). This Perspective highlights QSR in semiconductor quantum wires and dots identified in time-resolved transient absorption and two-dimensional electronic spectroscopy experiments. Beyond the interest in understanding the principles of QSR and energy-coupling mechanisms, we pose the contributions of QSR in time-resolved spectroscopy data must be accounted for to accurately identify the time scales for intraband relaxation of the carriers within SNCs.

中文翻译：

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半导体纳米粒子中的量子态重整化


极性半导体纳米晶体 （SNC） 中的单个光激发电子-空穴对会改变其内部的电荷屏蔽和屏蔽。晶格以及价带和导带的扰动产生，SNC 中的量子限制态发生独特变化，依赖于载流子所占据的状态。这种偏移称为量子态重整化 （QSR）。此视角突出显示了在时间分辨瞬态吸收和二维电子光谱实验中鉴定的半导体量子线和点中的 QSR。除了对理解 QSR 原理和能量耦合机制的兴趣之外，我们还提出必须考虑 QSR 在时间分辨光谱数据中的贡献，以准确识别 SNC 内载流子带内弛豫的时间尺度。