2023/11/06 by Julian Heckötter, Binodbihari Panda, Heckötter, Julian +5
Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics of Superconductivity and Magnetism #Spectroscopy and Quantum Chemical Studies #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.2311.03170
openalex publication_date 2023/11/06 · openalex created_date 2023/11/08 · openalex updated_date 2026/07/28
We investigate the neutralization of charged defects in a Cu2O crystal experimentally with a cw two-color pump-probe setup. We demonstrate that the excitation of high-lying Rydberg excitons at low densities generates an enhancement of exciton absorption up to a factor of 3. The result is an overall improvement of the absorption spectrum's quality in terms of increased oscillator strengths and narrower linewidths, referred to as purification. The reduction of the amount of charged impurities in the crystal is further verified by a thorough analysis of impurity photoluminescence signals.