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Title: Bright exciton fine-structure in two-dimensional lead halide perovskites
Authors: Do, Thi Thu Ha
del Aguila, Andres Granados
Zhang, Dong
Xing, Jun
Liu, Sheng
Prosnikov, M. A.
Gao, Weibo
Chang, Kai
Christianen, Peter C. M.
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2020
Source: Do, T. T. H., del Aguila, A. G., Zhang, D., Xing, J., Liu, S., Prosnikov, M. A., Gao, W., Chang, K., Christianen, P. C. M. & Xiong, Q. (2020). Bright exciton fine-structure in two-dimensional lead halide perovskites. Nano Letters, 20(7), 5141-5148.
Project: MOE2018-T3-1-002
MOE2018- T2-2-068
Journal: Nano Letters
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 g-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.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.0c01364
Rights: © 2020 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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