Fig. 1
From: Diversity of trion states and substrate effects in the optical properties of an MoS2 monolayer
Exciton and trion spectrum of an MoS2 monolayer. The excitonic contribution to the optical absorption spectrum is shown in red. The trionic contribution (shown in blue, referring to negative trions in a and positive trions in b) exhibits resonant states (close to the A and B exciton) and bound states (red-shifted compared to the corresponding excitons). The A− trion is split into three separate peaks, labeled \({\mathrm{A}}_{(1,2,3)}^ -\). The numerical recursion scheme64 is used to calculate the energetically lowest states. For the spectra above 2.3 eV in a and 2.4 eV in b, the Haydock recursion scheme is applied. An artificial broadening of 0.01 eV is used. Inset: comparison between the real space electron distribution (in arbitraty units) of the A exciton with the electron distribution from the \({\mathrm{A}}_{(1)}^ -\) trion (see Supplementary Fig. 7 for details). For this, the hole is fixed in the center of the panel close to a Mo atom, in which the distribution is shown. For the trion state, the distribution of one electron is shown after complete spacial averaging over the second electron
