  The last few years have witnessed a surge in interest and research efforts in
the field of twistronics, especially in low-angle twisted bilayers of
transition metal dichalocogenides. These novel material platforms have been
demonstrated to host periodic arrays of excitonic quantum emitters, interlayer
excitons with long lifetimes, and exotic many-body states. While much remains
to be known and understood about these heterostructures, the field of
high-angle, incommensurate bilayers is even less explored. At twist angles
larger than a few degrees, the presence of periodicity in these bilayers
becomes chaotic, making the systems essentially aperiodic and incommensurate in
nature due to the limitations of fabrication techniques. In this work, we
demonstrate the emergence of a brightened dark intralayer exciton in twisted
molybdenum diselenide homobilayer. We show that this dark exciton diffuses
across the excitation spot more efficiently as compared to trions or excitons,
reaching diffusion lengths greater than 4 microns. Temperature-dependent
spectra provide corroborative evidence and reveal a brightened dark trion. Our
results reveal some of the richness of the physics of these high-angle systems.
