Shaping exciton polarization dynamics in 2D semiconductors by tailored ultrafast pulses.

ABSTRACT: The ultrafast formation of strongly bound excitons in two-dimensional semiconductors provides a rich platform for studying fundamental physics as well as developing novel optoelectronic technologies. While extensive research has explored the excitonic coherence, many-body interactions, and nonlinear optical properties, the potential to study these phenomena by directly controlling their coherent polarization dynamics has not been fully realized. In this work, we use a sub-10 fs pulse shaper to study how temporal control of coherent exciton polarization affects the generation of four-wave mixing in monolayer WSe2 under ambient conditions. By tailoring multiphoton pathway interference, we tune the nonlinear response from destructive to constructive interference, resulting in a 2.6-fold enhan

SUBMITTER: Meron O 

PROVIDER: S-EPMC11814118 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature