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arXiv · 1612.07396

Bright-exciton fine structures splittings in single perovskite nanocrystals

Chunyang Yin·Liyang Chen·Yan Lv·Fengrui Hu·Chun Sun·William W. Yu·Chunfeng Zhang·Xiaoyong Wang·Yu Zhang·Min Xiao
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Abstract

Although both epitaxial quantum dots (QDs) and colloidal nanocrystals (NCs) are quantum-confined semiconductor nanostructures, so far they have demonstrated dramatically-different exciton fine structure splittings (FSSs) at the cryogenic temperature. The single-QD photoluminescence (PL) is dominated by the bright-exciton FSS, while it is the energy separation between bright and dark excitons that is often referred to as the FSS in a single NC. Here we show that, in single perovskite CsPbI3 NCs synthesized from a colloidal approach, a bright-exciton FSS as large as hundreds of {\mu}eV can be resolved with two orthogonally- and linearly-polarized PL peaks. This PL doublet could switch to a single peak when a single CsPbI3 NC is photo-charged to eliminate the electron-hole exchange interaction. The above findings have prepared an efficient platform suitable for probing exciton and spin dynamics of semiconductor nanostructures at the visible-wavelength range, from which a variety of practical applications such as in entangled photon-pair source and quantum information processing can be envisioned.

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Chunyang Yin, Liyang Chen, Yan Lv, Fengrui Hu, Chun Sun, William W. Yu, Chunfeng Zhang, Xiaoyong Wang, Yu Zhang, Min Xiao. 2016-12-22. Bright-exciton fine structures splittings in single perovskite nanocrystals. https://doi.org/10.1103/physrevlett.119.026401

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