Observation of the polaronic character of excitons in a two-dimensional semiconducting magnet CrI3

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dc.creatorJin, Wencan
dc.creatorKim, Hyun Ho
dc.creatorYe, Zhipeng (TTU)
dc.creatorYe, Gaihua (TTU)
dc.creatorRojas, Laura (TTU)
dc.creatorLuo, Xiangpeng
dc.creatorYang, Bowen
dc.creatorYin, Fangzhou
dc.creatorHorng, Jason Shih An
dc.creatorTian, Shangjie
dc.creatorFu, Yang
dc.creatorXu, Gongjun
dc.creatorDeng, Hui
dc.creatorLei, Hechang
dc.creatorTsen, Adam W.
dc.creatorSun, Kai
dc.creatorHe, Rui (TTU)
dc.creatorZhao, Liuyan
dc.date.accessioned2023-04-03T15:50:00Z
dc.date.available2023-04-03T15:50:00Z
dc.date.issued2020
dc.description© 2020, The Author(s). cc-by
dc.description.abstractExciton dynamics can be strongly affected by lattice vibrations through electron-phonon coupling. This is rarely explored in two-dimensional magnetic semiconductors. Focusing on bilayer CrI3, we first show the presence of strong electron-phonon coupling through temperature-dependent photoluminescence and absorption spectroscopy. We then report the observation of periodic broad modes up to the 8th order in Raman spectra, attributed to the polaronic character of excitons. We establish that this polaronic character is dominated by the coupling between the charge-transfer exciton at 1.96 eV and a longitudinal optical phonon at 120.6 cm−1. We further show that the emergence of long-range magnetic order enhances the electron-phonon coupling strength by ~50% and that the transition from layered antiferromagnetic to ferromagnetic order tunes the spectral intensity of the periodic broad modes, suggesting a strong coupling among the lattice, charge and spin in two-dimensional CrI3. Our study opens opportunities for tailoring light-matter interactions in two-dimensional magnetic semiconductors.
dc.identifier.citationJin, W., Kim, H.H., Ye, Z., Ye, G., Rojas, L., Luo, X., Yang, B., Yin, F., Horng, J.S.A., Tian, S., Fu, Y., Xu, G., Deng, H., Lei, H., Tsen, A.W., Sun, K., He, R., & Zhao, L.. 2020. Observation of the polaronic character of excitons in a two-dimensional semiconducting magnet CrI3. Nature Communications, 11(1). https://doi.org/10.1038/s41467-020-18627-x
dc.identifier.urihttps://doi.org/10.1038/s41467-020-18627-x
dc.identifier.urihttps://hdl.handle.net/2346/92431
dc.language.isoeng
dc.titleObservation of the polaronic character of excitons in a two-dimensional semiconducting magnet CrI3
dc.typeArticle

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