Bright Exciton Fine-Structure in Two-Dimensional Lead Halide Perovskites.

Do, T Thu Ha; Granados Del Águila, Andrés; Zhang, Dong; Xing, Jun; Liu, Sheng; Prosnikov, M A; Gao, Weibo; Chang, Kai et al. · Nano Lett · 2020

basic_science · Level V

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Abstract

The fast-growing field of atomically thin semiconductors urges a new understanding of two-dimensional excitons, which entirely determine their optical responses. Here, taking layered lead halide perovskites as an example of unconventional two-dimensional semiconductors, by means of versatile optical spectroscopy measurements, we resolve fine-structure splitting of bright excitons of up to ∼2 meV, which is among the largest values in two-dimensional semiconducting systems. The large fine-structure splitting is attributed to the strong electron-hole exchange interaction in layered perovskites, which is proven by the optical emission in high magnetic fields of up to 30 T. Furthermore, we determine the <i>g</i>-factors for these bright excitons as ∼+1.8. Our findings suggest layered lead halide perovskites are an ideal platform for studying exciton spin-physics in atomically thin semiconductors that will pave the way toward exciton manipulation for novel device applications.