We have investigated indirect excitons in bulk 2H-MoS using transmission electron energy-loss spectroscopy. The electron energy-loss spectra were measured for various momentum transfer values parallel to the [Formula: see text] and [Formula: see text] directions of the Brillouin zone. The results allowed the identification of the indirect excitons between the valence band K and conduction band Λ points, the Γ and K points as well as adjacent K and [Formula: see text] points. The energy-momentum dispersions for the K -Λ, Γ-K and K -[Formula: see text] excitons along the [Formula: see text] line are presented. The former two transitions exhibit a quadratic dispersion which allowed calculating their effective exciton masses based on the effective mass approximation. The K -[Formula: see text] transition follows a more linear dispersion relationship.

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http://dx.doi.org/10.1088/1361-648X/aabd02DOI Listing

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