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Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe2
Physical Review Letters ( IF 9.227 ) Pub Date : 
Erfu Liu, Jeremiah van Baren, Ching-Tang Liang, Takashi Taniguchi, Kenji Watanabe, Nathaniel M. Gabor, Yia-Chung Chang, and Chun Hung Lui

Excitons and trions (or exciton-polarons) in transition metal dichalcogenides (TMDs) are known to decay predominantly through intravalley transitions. Electron-hole recombination across different valleys can also play crucial roles in the excitonic dynamics, but intervalley transitions are rarely observed in monolayer TMDs because they violate the conservation of momentum. Here we reveal the intervalley recombination of dark excitons and trions in monolayer WSe2 through more than one decay channels. We observe the intervalley dark excitons, which can recombine by the assistance of defect scattering or chiral-phonon emission. We also reveal that a trion can decay in two distinct paths – through intravalley or intervalley electron-hole recombination – into two different final valley states. Although these two paths are energy-degenerate, we can distinguish them by lifting the valley degeneracy under magnetic field In addition, the intra- and inter-valley trion transitions are coupled to zone-center and zone-corner chiral phonons, respectively, to produce distinct phonon replicas. The observed multipath optical decays of dark excitons and trions provide much insight into the hidden internal structure of trions and the complex excitonic interactions with defects, chiral phonons, and ambient carriers in monolayer valley semiconductors.
更新日期:2020-03-26

 

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