Interseries dipole transitions from yellow to green excitons in cuprous oxide

Abstract

We study dipole interseries transitions between the yellow and green exciton series in cuprous oxide including the complex valence-band structure. To this end, we extend previous studies of the spectrum of complex green exciton resonances [P. Rommel, P. Zielinski, and J. Main, Phys. Rev. B 101, 075208 (2020)] to optical transitions between different exciton states in addition to transitions from the crystal ground state. This allows us to augment the calculations on interseries transitions using a hydrogenlike model [S. O. Kr\"uger and S. Scheel, Phys. Rev. B 100, 085201 (2019)] by a more comprehensive treatment of the valence-band structure.