Large-scale characterization of Cu2O monocrystals via Rydberg excitons

This research introduces a novel experimental technique to characterize Rydberg excitons in copper oxide (Cu₂O) crystals with sub-micron resolution. By employing spatially resolved resonant absorption spectroscopy and photoluminescence imaging, the study unveils the influence of optically-active charged oxygen vacancies on Rydberg excitons. This approach yields comprehensive spatial maps of exciton properties, including energy, linewidth, and peak absorption without any mobile part, providing valuable insights into crystal quality. The findings highlight the predominant role of charged oxygen vacancies in influencing Rydberg excitons in Cu₂O and offer a reliable method for assessing crystal quality in view of solid-state Rydberg physics.