Figure 1: Intervalley electron-electron scattering process.
From: Dark trions and biexcitons in WS2 and WSe2 made bright by e-e scattering
Schematics of the band structures of WX2 near the K, K′ points of the BZ, and the intervalley scattering process that mixes dark and bright states of trions (T) and biexcitons (B). Eg is the band gap and ΔSO stands for the conduction band spin splitting. Due to the large spin-orbit splitting in the valence band, the valence band is shown only for the higher-energy spin-polarised states.
