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 journalArticlepeer-review

8 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 languageEnglish
Article number083107
JournalApplied Physics Letters
Volume117
Issue number8
DOIs
Publication statusPublished - 24 Aug 2020
Externally publishedYes

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