Fig. 1: Excitonic states in n-doped WSe2.
From: Spin/valley pumping of resident electrons in WSe2 and WS2 monolayers
a Sketch of the sample. b PL intensity as a function of electron density. The excitation energy is 1.96 eV. c Imaginary part of the optical susceptibility χ measured using differential reflectivity as a function of electron density. The reflectivity contrast is transformed into Im(χ) using a Kramers-Kronig transform26.
