A holistic view of the dynamics of long-lived valley polarized dark excitonic states in monolayer WS2

Tr-ARPES experiment on 1 L WS₂: Valley-selective excitation

Our sample is an exfoliated WS₂ monolayer, transferred on a thin hBN buffer layer supported by a conducting Si substrate (see Methods). The TR-ARPES experiments (Fig. 1b) were…