Trion-to-exciton upconversion dynamics in monolayer WSe2

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

doi:10.1063/5.0012116

Trion-to-exciton upconversion dynamics in monolayer WSe₂

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

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.

Original language	English
Article number	083107
Journal	Applied Physics Letters
Volume	117
Issue number	8
DOIs	https://doi.org/10.1063/5.0012116
Publication status	Published - 24 Aug 2020
Externally published	Yes

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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), Article 083107. https://doi.org/10.1063/5.0012116

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abstract = "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.",

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AU - Lan, Wenze

AU - Wang, Jing

AU - Xin, Ming

AU - Huang, Yuan

AU - Gu, Changzhi

AU - Liu, Baoli

PY - 2020/8/24

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AB - 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.

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JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

Trion-to-exciton upconversion dynamics in monolayer WSe₂

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