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Momentum resolved electron energy-loss spectroscopy was used to measure thedispersions of excitons in a free-standing monolayer of WSe2. Besides theparabolically dispersed valley excitons, a sub-gap dispersive exciton wasobserved at specific q values for the first time. The simultaneous STEM-ADFimaging of the local probed areas suggests that this sub-gap exciton isattributed to the prolific Se vacancies.

Probing exciton dispersions of freestanding monolayer WSe2 by momentum resolved electron energy loss spectroscopy