Exciton-phonon interaction breaking all antiunitary symmetries in external magnetic fields

Abstract

Recent experimental investigations by M. Aßmann et al. [Nature Mater. 15, 741 (2016)] on the spectrum of magnetoexcitons in cuprous oxide revealed the statistics of a Gaussian unitary ensemble (GUE). The model of F. Schweiner et al. [Phys. Rev. Lett. 118, 046401 (2017)], which includes the complete cubic valence band structure of the solid, can explain the appearance of GUE statistics if the magnetic field is not oriented in one of the symmetry planes of the cubic lattice. However, it cannot explain the experimental observation of GUE statistics for all orientations of the field. In this paper we investigate the effect of quasi-particle interactions or especially the exciton-phonon interaction on the level statistics of magnetoexcitons and show that the motional Stark field induced by the exciton-phonon interaction leads to the occurrence of GUE statistics for arbitrary orientations of the magnetic field in agreement with experimental observations. Importantly, the breaking of all antiunitary symmetries can be explained only by considering both the exciton-phonon interaction and the cubic crystal lattice.

arXiv commentAccepted for publication in Phys. Rev. B. arXiv admin note: text overlap with arXiv:1705.06432 due to recapitulation of basic theory of the physical system. Topics of articles are clearly different

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Cited by in corpus (6)

• Exciton-polaritons in cuprous oxide: Theory and comparison with experiment
• Electro-optical properties of Cu${}_2$O in the regime of Franz-Keldysh oscillations
• Magneto-Stark-effect of yellow excitons in cuprous oxide
• Crossover between the Gaussian orthogonal ensemble, the Gaussian unitary ensemble, and Poissonian statistics
• Thermal effect on magnetoexciton energy spectra in monolayer transition metal dichalcogenides
• Eigenenergies of excitonic giant-dipole states in cuprous oxide