About a decade ago, the discovery of monolayers of transition metal dichalcogenides opened a new frontier in the study of optically excited states in semiconductors. These materials exhibit a plethora of robust excitonic states, such as the optically accessible bright excitons, momentum- and spin-forbidden dark excitons, and hot excitons. In today’s talk, I will discuss studies in my lab of photoexcited two-dimensional semiconductors using time-resolved photoemission spectroscopy.
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