Speaker: Keshav Dani, OIST
Program Description:
Two-dimensional semiconductors, such as the transition metal dichalcogenides, exhibit a rich variety of robust excitonic states, including bright excitons at the K & K’ valleys, and momentum- and spin-forbidden dark excitons. Optics experiments have revealed much about the bright excitonic states, but they remain largely unable to access the dark excitons and their momentum- and energy-resolved decay channels. Angle-Resolved Photoemission Spectroscopy (ARPES) based techniques would be ideal for this. I will discuss the challenges (and progress made) in using them to study 2D semiconductors. Time permitting – we will end with an entertaining peek into the ‘quantum psychology of dark excitons’!
