At 20 K, optically excited excitons in monolayer WS2 are predicted to exhibit transient negative diffusion, with their spatial distribution narrowing for tens of picoseconds due to intervalley exciton-phonon scattering.
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Negative excitonic diffusion in transition metal dichalcogenides
At 20 K, optically excited excitons in monolayer WS2 are predicted to exhibit transient negative diffusion, with their spatial distribution narrowing for tens of picoseconds due to intervalley exciton-phonon scattering.