Trion-to-exciton upconversion dynamics in monolayer WSe2

Wenze Lan, Jing Wang, Ming Xin, Yuan Huang, Changzhi Gu, Baoli Liu*

*此作品的通讯作者

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摘要

We investigate the trion-to-exciton upconversion dynamics in a large-scale mechanically exfoliated tungsten diselenide (WSe2) monolayer covered by poly(methyl methacrylate) using two-color ultrafast pump-probe spectroscopy. With resonantly pumping the trion and probing the exciton transitions, we find a fast trion-to-exciton upconversion process with the upconversion time about ∼2 ps. Combined with the temperature-dependent transient reflection and helicity-resolved Raman measurements, we further demonstrate that the upconversion is indeed a phonon-mediated process in our sample.

源语言英语
文章编号083107
期刊Applied Physics Letters
117
8
DOI
出版状态已出版 - 24 8月 2020
已对外发布

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Lan, W., Wang, J., Xin, M., Huang, Y., Gu, C., & Liu, B. (2020). Trion-to-exciton upconversion dynamics in monolayer WSe2. Applied Physics Letters, 117(8), 文章 083107. https://doi.org/10.1063/5.0012116