Abstract:
This thesis presents an experimental study on excitons in TMD heterostructures in two extreme cases. First, strongly localized excitons at artificially created defects in atomically thin MoS2. We demonstrate that site-selective helium ion irradiation is a scalable approach to create single-photon emitters. Second, interlayer excitons (IXs) in MoSe2-WSe2 heterostructures. We explore the phase diagram of photogenerated IX ensembles and report on signatures of a degenerate many-body state.