Excitons in atomically thin materials flow faster than they fly – Nature Nanotechnology

Monolayer transition metal dichalcogenides are renowned for hosting excitons, electron–hole pairs bound together by Coulombic attraction. Being analogues of atoms, they feature sharp lines in optical spectra¹. Excitons can propagate in the monolayer plane. Typically, they diffuse out of the spot where they have been generated, propagating by fractions of micrometres during their lifetime². Writing in Nature Nanotechnology³, Andrés Granados del Águila and co-workers now report on the experimental realization of a very different exciton propagation scenario in monolayer MoS₂: a fluid-like flow of excitons by several tens of micrometres at a speed of about 2 × 10⁷ m s^–1.

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• Source: https://www.nature.com/articles/s41565-023-01448-6