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Paper detail

Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation

We studied multi-exciton dynamics in monolayer WSe2 using nonlinear photoluminescence (PL) spectroscopy and Monte Carlo simulations. We observed strong nonlinear saturation behavior of exciton PL with increasing excitation power density, and long-distance exciton diffusion reaching several micrometers. We demonstrated that the diffusion-assisted exciton-exciton annihilation model accounts for the observed nonlinear PL behavior. The long-distance exciton diffusion and subsequent efficient exciton-exciton annihilation process determined the unusual multi-exciton dynamics in atomically thin layered transition metal dichalcogenides.

preprint2014arXivOpen access
Shinichiro MouriYuhei MiyauchiMinglin TohWeijie ZhaoGoki EdaKazunari Matsuda
cond-mat.mes-hall
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Shinichiro MouriYuhei MiyauchiMinglin TohWeijie ZhaoGoki EdaKazunari Matsuda

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