Quasiparticle energies and optical response of RbTiOPO4 and KTiOAsO4

S. Neufeld, A. Schindlmayr, W.G. Schmidt, Journal of Physics: Materials 5 (2021).

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Journal Article | Published | English
Abstract
Many-body perturbation theory based on density-functional theory calculations is used to determine the quasiparticle band structures and the dielectric functions of the isomorphic ferroelectrics rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenide (KTiOAsO4). Self-energy corrections of more than 2 eV are found to widen the transport band gaps of both materials considerably to 5.3 and 5.2 eV, respectively. At the same time, both materials are characterized by strong exciton binding energies of 1.4 and 1.5 eV, respectively. The solution of the Bethe-Salpeter equation based on the quasiparticle energies results in onsets of the optical absorption within the range of the measured data.
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Journal Title
Journal of Physics: Materials
Volume
5
Issue
1
Article Number
015002
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Article Processing Charge funded by the Deutsche Forschungsgemeinschaft and the Open Access Publication Fund of LibreCat University.
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Neufeld S, Schindlmayr A, Schmidt WG. Quasiparticle energies and optical response of RbTiOPO4 and KTiOAsO4. Journal of Physics: Materials. 2021;5(1). doi:10.1088/2515-7639/ac3384
Neufeld, S., Schindlmayr, A., & Schmidt, W. G. (2021). Quasiparticle energies and optical response of RbTiOPO4 and KTiOAsO4. Journal of Physics: Materials, 5(1), Article 015002. https://doi.org/10.1088/2515-7639/ac3384
@article{Neufeld_Schindlmayr_Schmidt_2021, title={Quasiparticle energies and optical response of RbTiOPO4 and KTiOAsO4}, volume={5}, DOI={10.1088/2515-7639/ac3384}, number={1015002}, journal={Journal of Physics: Materials}, publisher={IOP Publishing}, author={Neufeld, Sergej and Schindlmayr, Arno and Schmidt, Wolf Gero}, year={2021} }
Neufeld, Sergej, Arno Schindlmayr, and Wolf Gero Schmidt. “Quasiparticle Energies and Optical Response of RbTiOPO4 and KTiOAsO4.” Journal of Physics: Materials 5, no. 1 (2021). https://doi.org/10.1088/2515-7639/ac3384.
S. Neufeld, A. Schindlmayr, and W. G. Schmidt, “Quasiparticle energies and optical response of RbTiOPO4 and KTiOAsO4,” Journal of Physics: Materials, vol. 5, no. 1, Art. no. 015002, 2021, doi: 10.1088/2515-7639/ac3384.
Neufeld, Sergej, et al. “Quasiparticle Energies and Optical Response of RbTiOPO4 and KTiOAsO4.” Journal of Physics: Materials, vol. 5, no. 1, 015002, IOP Publishing, 2021, doi:10.1088/2515-7639/ac3384.
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Quasiparticle energies and optical response of RbTiOPO4 and KTiOAsO4
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