Valley Polarization Dynamics of Inter- and Intra-valley Trions in Monolayer WSe_2

摘要

We investigate valley polarization dynamics of trions in WSe_2 in resonant pump-probe experiments. Intra- and inter-valley trions show distinct polarization dynamics, the former exhibits long-lived valley polarization (> 25 ps), the latter a fast decay of ～4 ps.