Computer modeling of point defects, polarons, excitons and surfaces in perovskite ferroelectrics
Autor(en): | Borstel, G. Eglitis, R.I. Kotomin, E.A. Heifets, E. |
Herausgeber: | Krumins, A. Millers, D. Muzikante, I. Sternbergs, A. Zauls, V. |
Stichwörter: | Ab initio methods; ABO3 perovskites; Carrier concentration; Computer simulation; Defect diffusion; Electronic structure; Excitons; F centers; Light absorption; Perovskite; Point defects; Polarons; Potassium compounds; Probability density function; Semiempirical calculations; Strontium compounds; Thin films, Negative charged defects, Ferroelectric materials | Erscheinungsdatum: | 2002 | Journal: | Proceedings of SPIE - The International Society for Optical Engineering | Volumen: | 5122 | Startseite: | 253 | Seitenende: | 263 | Zusammenfassung: | We review results of our recent large-scale computer simulations of point defects, excitons and polarons in ABO3 perovskite crystals, focusing mostly on KNbO3 and KTaO3 as representative examples. We have calculated the atomic and electronic structure of defects, their optical absorption and defect-induced electron density redistribution. The majority of results are obtained using the quantum chemical method of the intermediate neglect of differential overlap (INDO) based on the Hartree-Fock formalism. The main findings are compared with results of ab initio Density Functional Theory (FP-LMTO) first-principles calculations. The results of the electronic structure calculations for different terminations of SrTiO3 (100) thin films are discussed. These calculations are based on the ab initio Hartree-Fock (HF) method and Density Functional Theory (DFT). Results are compared with previous ab initio plane-wave LDA and classical Shell Model (SM) calculations. Calculated considerable increase of the Ti-O chemical bond nearby the surface is confirmed by experimental data. |
Beschreibung: | Conference of PROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Advanced Organic and Inorganic Optical Materials ; Conference Date: 19 August 2002 Through 22 August 2002; Conference Code:61953 |
ISSN: | 0277786X | DOI: | 10.1117/12.515775 | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0344082143&doi=10.1117%2f12.515775&partnerID=40&md5=1bdbc369dd91b1f18186ac1fa0c1e7b7 |
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