Frank Schweiner

Magnetoexcitons Break Antiunitary Symmetries

We show analytically and numerically that the application of an external magnetic field to highly excited Rydberg excitons breaks all antiunitary symmetries in the system. Only by considering the complete valence band structure of a direct-band-gap cubic semiconductor, the Hamiltonian of excitons leads to the statistics of a Gaussian unitary ensemble without the need for interactions with other quasiparticles like phonons. Hence, we give theoretical evidence for a spatially homogeneous system breaking all antiunitary symmetries.

Linewidths in excitonic absorption spectra of cuprous oxide

We present a theoretical calculation of the absorption spectrum of cuprous oxide

Exciton-polaritons in cuprous oxide: Theory and comparison with experiment

\left(\mathrm{Cu_{2}O}\right)

GOE-GUE-Poisson transitions in the nearest-neighbor spacing distribution of magnetoexcitons

based on the general theory developed by Y. Toyozawa. An inclusion not only of acoustic phonons but also of optical phonons and of specific properties of the excitons in

Even exciton series in Cu2O

\mathrm{Cu_{2}O}

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

like the central-cell corrections for the

Classical dynamics and localization of resonances in the high-energy region of the hydrogen atom in crossed fields.

1S

Rydberg systems in parallel electric and magnetic fields: an improved method for finding exceptional points

-exciton allows us to calculate the experimentally observed line widths in experiments by T. Kazimierczuk et al [Nature 514, 343, (2014)] within the same order of magnitude, which demonstrates a clear improvement in comparison to earlier work on this topic. We also discuss a variety of further effects, which explain the still observable discrepancy between theory and experiment but can hardly be included in theoretical calculations.

K -dependent exchange interaction of the 1 S orthoexciton in Cu 2 O

The observation of giant Rydberg excitons in cuprous oxide

Impact of the valence band structure of Cu

\left(\mathrm{Cu_{2}O}\right)