Fig. 4: Experimental observations in n-WS2.
From: Spin/valley pumping of resident electrons in WSe2 and WS2 monolayers
a Photoluminescence spectra of WS2 for σ+ and σ- detection with σ+ excitation. b Photoluminescence spectra of WS2 with circular excitation and linear excitation. Excitation power is 18 µW.
