The ultrafast B-exciton bleaching after A-exciton pumping in monolayer TMDCs is explained by phonon-assisted formation of momentum-indirect excitons coupled across valleys by Coulomb exchange, with no B-exciton population.
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Ultrafast dynamics in monolayer TMDCs: the interplay of dark excitons, phonons and intervalley Coulomb exchange
The ultrafast B-exciton bleaching after A-exciton pumping in monolayer TMDCs is explained by phonon-assisted formation of momentum-indirect excitons coupled across valleys by Coulomb exchange, with no B-exciton population.