A new publication from Prof. Tony Heinz group with Model IMPULSE from Clark-MXR. Please contact us for more information on Model IMPULSE and Model iNOPA. 

Observation of Rapid Exciton–Exciton Annihilation in Monolayer Molybdenum Disulfide

Dezheng Sun, Yi Rao, Georg A. Reider, Gugang Chen, Yumeng You, Louis Brézin, Avetik R. Harutyunyan, and Tony F. Heinz

Monolayer MoS₂ is a direct-gap two-dimensional semiconductor that exhibits strong electron–hole interactions, leading to the formation of stable excitons and trions. Here we report the existence of efficient exciton–exciton annihilation, a four-body interaction, in this material. Exciton–exciton annihilation was identified experimentally in ultrafast transient absorption measurements through the emergence of a decay channel varying quadratically with exciton density. The rate of exciton–exciton annihilation was determined to be (4.3 ± 1.1) × 10^–2 cm²/s at room temperature.

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