Strong excitonic interactions in the oxygen K-edge of perovskite oxides
| Autor: | Weine Olovsson, Kota Tomita, Tomohiro Miyata, Teruyasu Mizoguchi |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Condensed matter physics Chemistry Exciton chemistry.chemical_element 02 engineering and technology Electronic structure Electron 021001 nanoscience & nanotechnology 01 natural sciences Oxygen Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science K-edge 0103 physical sciences Physics::Chemical Physics 0210 nano-technology Instrumentation Perovskite (structure) |
| Zdroj: | Ultramicroscopy. 178:105-111 |
| ISSN: | 0304-3991 |
| Popis: | Excitonic interactions of the oxygen K-edge electron energy-loss near-edge structure (ELNES) of perovskite oxides, CaTiO3, SrTiO3, and BaTiO3, together with reference oxides, MgO, CaO, SrO, BaO, and TiO2, were investigated using a first-principles Bethe-Salpeter equation calculation. Although the transition energy of oxygen K-edge is high, strong excitonic interactions were present in the oxygen K-edge ELNES of the perovskite oxides, whereas the excitonic interactions were negligible in the oxygen K-edge ELNES of the reference compounds. Detailed investigation of the electronic structure suggests that the strong excitonic interaction in the oxygen K-edge ELNES of the perovskite oxides is caused by the directionally confined, low-dimensional electronic structure at the Ti-O-Ti bonds. |
| Databáze: | OpenAIRE |
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