Abstract
We present a first-principles study of defect formation and electronic structure of erbium (Er)-doped yttria (Y₂O₃). This is an emerging material for spin-photon interfaces in quantum information science due to the narrow linewidth optical emission from Er dopants at standard telecommunication wavelengths and their potential for quantum memories and transducers. We calculate formation energies of neutral, negatively, and positively charged Er dopants and find the charge neutral configuration to be the most stable, consistent with experiment. Of the two substitutional sites of Er for Y, the C₂ (more relevant for quantum memories) and C_3i (more relevant for quantum transduction), we identify the former as possessing the lowest formation energy. The electronic properties are calculated using the Perdew-Burke-Ernzerhof (PBE) functional along with the Hubbard U parameter and spin-orbit coupling (SOC), which yields a ∼ 6 μ_B orbital and a ∼ 3 μ_B spin magnetic moment, and 11 electrons in the Er 4f shell, confirming the formation of charge-neutral Er³⁺. This standard density functional theory (DFT) approach underestimates the band gap of the host and lacks a first-principles justification for U. To overcome these issues, we performed screened hybrid functional (HSE) calculations, including a negative U for the 4f orbitals, with mixing (α) and screening (w) parameters. These produced robust electronic features with slight modifications in the band gap and the 4f splittings depending on the choice of tuning parameters. We also computed the many-particle electronic excitation energies and compared them with experimental values from photoluminescence.