Fig. 4
From: Negative circular polarization emissions from WSe2/MoSe2 commensurate heterobilayers
Excitation energy dependence of PL intensity and circular polarization of interlayer excitons. a AA stacking. b AB stacking. Top: contour plots for the XI PL spectra using different excitation energies. Middle: the corresponding PLE spectra. The differential reflectance spectra ΔR/R are also shown for comparison. Bottom: the degree of circular polarization PC as a function of excitation energy. \({\mathrm{X}}_{\mathrm{A}}^{{\mathrm{Mo}}}\) and \({\mathrm{X}}_{\mathrm{A}}^{\mathrm{W}}\)(\({\mathrm{X}}_{\mathrm{B}}^{{\mathrm{Mo}}}\) and \({\mathrm{X}}_{\mathrm{B}}^{\mathrm{W}}\)) denote A (B) excitons in MoSe2 and WSe2, respectively. The \({\mathrm{X}}_{\mathrm{A}}^{\mathrm{W}}\) peak measured by PLE and differential reflectance ΔR/R is dominated by trion absorption
