Prof. Yanjun Fang Profile

Prof. Yanjun Fang

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Proceedings Article | 18 March 2024 Paper

Magneto-optical study of exciton fine structures in 2D HOIP (PEA)2PbI4

Wei Tang, Liting Tao, Yanjun Fang, Linjun Li

Proceedings Volume 13104, 1310428 (2024) https://doi.org/10.1117/12.3022811

KEYWORDS: Excitons, Perovskite, Crystals, Magnetooptics

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(PEA)₂PbI₄ is one of typical two-dimensional hybrid organic–inorganic perovskites (2D HOIP), possessing rich exciton physics because of its asymmetric crystal structure, strong spin-orbit coupling and its natural multiple quantum well structure, which leads to strong quantum and dielectric confinement effect. We performed low temperature magneto-optical experiments under both Faraday and Voigt magnetic field configurations to unravel the exciton fine structure in (PEA)₂PbI₄, and observed four linear polarized peaks without magnetic field, one lower energy and one higher energy peak appear under in-plane magnetic field. The lower energy state dominate the photoluminecence when the magnetic field reaches a few teslas, and gold nanoparticles can strengthen the absorption of the higher energy state, thus we attribute the lowest energy state to the dark exciton state and the highest energy state to the out-of-plane grey exciton state. Our work makes progress in understanding the exciton fine structure splitting in this excellent opto-electronic material(2D HOIP). These spin and polarization splitting states have great utilization potential in advanced quantum devices and spintronics.

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