Large-scale characterization of Cu2O monocrystals via Rydberg excitons

• URL: http://arxiv.org/abs/2402.02948v1
• Date: Mon, 5 Feb 2024 12:20:42 GMT
• Title: Large-scale characterization of Cu2O monocrystals via Rydberg excitons
• Authors: Kerwan Morin, Delphine Lagarde, Ang\'elique Gillet, Xavier Marie, Thomas Boulier
• Abstract summary: Rydberg states of excitons can reach microns in size and require extremely pure crystals. We introduce an experimental method for the rapid and spatially-resolved characterization of Rydberg excitons in copper oxide (Cu2O) Our approach involves illuminating and imaging the entire sample on a camera to realize a spatially-resolved version of resonant absorption spectroscopy.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Rydberg states of excitons can reach microns in size and require extremely pure crystals. We introduce an experimental method for the rapid and spatially-resolved characterization of Rydberg excitons in copper oxide (Cu2O) with sub-micron resolution over large zones. Our approach involves illuminating and imaging the entire sample on a camera to realize a spatially-resolved version of resonant absorption spectroscopy, without any mobile part. This yields spatial maps of Rydberg exciton properties, including their energy, linewidth and peak absorption, providing a comprehensive quality assessment of the entire sample in a single shot. Furthermore, by imaging the sample photoluminescence over the same zone, we establish a strong relationship between the spectral quality map and the photoluminescence map of charged oxygen vacancies. This results in an independent, luminescence-based quality map that closely matches the results obtained through resonant spectroscopy. Our findings reveal that Rydberg excitons in natural Cu2O crystals are predominantly influenced by optically-active charged oxygen vacancies, which can be easily mapped. Together, these two complementary methods provide valuable insights into Cu2O crystal properties.

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