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

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arxiv 1909.06033 v1 pith:F4VP6FRS submitted 2019-09-13 cond-mat.mtrl-sci cond-mat.mes-hall

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

Jinhua Hong , Ryosuke Senga , Thomas Pichler , Kazu Suenaga This is my paper
classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords excitondispersionselectronexcitonsmomentummonolayerresolvedspectroscopy
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Momentum resolved electron energy-loss spectroscopy was used to measure the dispersions of excitons in a free-standing monolayer of WSe2. Besides the parabolically dispersed valley excitons, a sub-gap dispersive exciton was observed at specific q values for the first time. The simultaneous STEM-ADF imaging of the local probed areas suggests that this sub-gap exciton is attributed to the prolific Se vacancies.

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