  Van der Waals heterostructures show fascinating physics including trapped
moire exciton states, anomalous moire exciton transport, generalized Wigner
crystals, etc. Bilayers of transition metal dichalcogenides (TMDs) are
characterized by long-lived spatially separated interlayer excitons. Provided a
strong interlayer tunneling, hybrid exciton states consisting of interlayer and
intralayer excitons can be formed. Here, electrons and/or holes are in a
superposition of both layers. Although crucial for optics, dynamics, and
transport, hybrid excitons are usually optically inactive and have therefore
not been directly observed yet. Based on a microscopic and material-specific
theory, we show that time- and angle-resolved photoemission spectroscopy
(tr-ARPES) is the ideal technique to directly visualize these hybrid excitons.
Concretely, we predict a characteristic double-peak ARPES signal arising from
the hybridized hole in the MoS$_2$ homobilayer. The relative intensity is
proportional to the quantum mixture of the two hybrid valence bands at the
$\Gamma$ point. Due to the strong hybridization, the peak separation of more
than 0.5 eV can be resolved in ARPES experiments. Our study provides a concrete
recipe of how to directly visualize hybrid excitons and how to distinguish them
from the usually observed regular excitonic signatures.
