Brightness of CrSBr excitons is a band-coherent interference effect: bright and dark partners are diagonal versus cross superpositions of the same four-band ligand-field transitions across the two Cr sites.
Strinati, Application of the Green’s functions method to the study of the optical properties of semiconductors, La Rivista del Nuovo Cimento11, 1 (1988)
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Bright and Dark Excitons in CrSBr: Local Ligand-Field Character and Band-Coherent Optical Selection Rules
Brightness of CrSBr excitons is a band-coherent interference effect: bright and dark partners are diagonal versus cross superpositions of the same four-band ligand-field transitions across the two Cr sites.