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The large surface-to-volume ratio in atomically thin 2D materials allows toefficiently tune their properties through modifications of their environment.Artificial stacking of two monolayers into a bilayer leads to an overlap oflayer-localized wave functions giving rise to a twist angle-dependenthybridization of excitonic states. In this joint theory-experiment study, wedemonstrate the impact of interlayer hybridization on bright and momentum-darkexcitons in twisted WSe$_2$ bilayers. In particular, we show that the stronghybridization of electrons at the $\Lambda$ point leads to a drastic redshiftof the momentum-dark K-$\Lambda$ exciton, accompanied by the emergence of flatmoir\'e exciton bands at small twist angles. We directly compare theoreticallypredicted and experimentally measured optical spectra allowing us to identifyphotoluminescence signals stemming from phonon-assisted recombination oflayer-hybridized dark excitons. Moreover, we predict the emergence ofadditional spectral features resulting from the moir\'e potential of thetwisted bilayer lattice.

Hybridized intervalley moir\'e excitons and flat bands in twisted WSe$_2$ bilayers