Fig. 2

Quasiparticle band structure of an MoS₂ monolayer. The figure focuses on the vicinity of the K⁺ and K⁻ points. a–c For all three negative trion excitations \({\mathrm{A}}_{(1,2,3)}^ -\) the band-resolved k-dependent contributions (square of the wave functions) are attached to the respective bands (black for the VB and dark (light) green for the CB (CB+1)). For the \({\mathrm{A}}_{(1,2)}^ -\) trions the electrons are located in different valleys, while for \({\mathrm{A}}_{(3)}^ -\) only one valley contributes. The initial one-electron state resides at K⁺ in the CB. d Contribution of the A⁺ trion, the initial hole resides at K⁺. We note that in addition to these trions with total momentum K⁺ the same set of trions with exchanged K⁺ ↔ K⁻ occurs for K = K⁻