Fig. 6: Spectral weight analysis in the band basis for the excitons in bulk CrCl3, CrBr3, CrI3.
From: Real- and momentum-space description of the excitons in bulk and monolayer chromium tri-halides
The spectral weight analysis for the deepest lying exciton ex1 in each case; (a, d) for CrCl3, (b, e) for CrBr3 and (c, f) for CrI3. The spectral weight is raised to the fourth power to identify variations in the band contribution to the spectral weight. In the direction of Cl → Br → I the number of bands that contribute to the spectral weight of ex1 decreases. Also the exciton spectral weight becomes more localized in band basis for X = I, compared to X = Cl, Br.
