Spatiotemporal imaging of low-energy excitations with exciton spectroscopy I: experiment

Monolayer transition metal dichalcogenide semiconductors combine robust optical transitions with strong electronic interactions in a highly tunable van der Waals geometry, realizing a platform with outstanding potential for discovering novel optoelectronic phenomena. In this talk, we describe experiments combining on-chip terahertz generation with time-resolved optical spectroscopy to examine the response of a monolayer semiconductor’s excitonic transitions to a picosecond-timescale driving field. This approach enables us to image electromagnetic propagation and assess the AC transport properties of the material, thus furnishing a new window into the microscopic dynamics of these fascinating systems.