Presentation Information
[3C08]Ultrafast exciton dynamics of 2D semiconductor probed by THz-STM
*Shoji Yoshida1, Yusuke Arashida1, Hiroyuki Mogi1, Osamu Takeuchi1, Hidemi Shigekawa1 (1. University of Tsukuba)
We investigated local exciton dynamics in monolayer TMDCs using THz-STM, which enables nanoscale spatial and sub-picosecond temporal resolution. In a MoS2/WSe2 hetero-bilayer, THz-induced tunneling current showed a sharp rise followed by exponential decay after optical excitation, reflecting exciton dissociation and carrier tunneling. The decay constant reveals local exciton lifetimes. Real-space imaging of exciton dynamics will also be discussed.