Optics of epitaxial strained strontium titanate films

0538767 - FZÚ 2021 RIV US eng J - Článek v odborném periodiku
Tyunina, Marina - Nepomniashchaia, Natalia - Vetokhina, Volha - Dejneka, Alexandr
Optics of epitaxial strained strontium titanate films.
Applied Physics Letters. Roč. 117, č. 8 (2020), s. 1-5, č. článku 082901. ISSN 0003-6951. E-ISSN 1077-3118
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA19-09671S
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: strontium titanate films * strained * epitaxial * optics
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.791, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1063/5.0021461

Diverse effects of lattice strain on the optical properties in the near-infrared to vacuum ultraviolet spectral range are experimentally revealed in cube-on-cube-type epitaxial perovskite SrTiO3 films grown on compressive substrate. Compared to the reference crystal, the tetragonal antiferrodistortive film exhibits spectral blueshifts, which are consistent with the theoretically predicted bandgap widening. In addition to this strain-induced interband effect, the peculiar near-edge absorption and smearing of interband transitions are found. It is shown that Fröhlich-type electron–phonon coupling can be enhanced by strain and lead to this behavior. It is suggested that electron–phonon interactions can play an important role in optical properties of ferroelectric films and deserve further studies.
Trvalý link: http://hdl.handle.net/11104/0316498