Optical transitions, exciton radiative decay, and valley coherence in lead chalcogenide quantum dots

Article

关键词: EXCHANGE INTERACTION;    FINE-STRUCTURE;    PBS;   

DOI  :  10.1103/PhysRevB.106.125301

来源: SCIE

【 摘 要 】

We propose the concept of valley coherence and superradiance in the reciprocal space and show that it leads to an N-fold decrease of the bright exciton radiative lifetime in quantum dots (QDs) of an N-valley semiconductor. Next we explain why, despite this, the exciton radiative lifetimes in PbX (X = S, Se, Te) QDs, measured from the photoluminescence decay are in the microsecond range. We also address peculiarities of the light-matter interaction in nanostructures made of narrow-gap materials with strong interband coupling.

【 授权许可】

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