Optics of epitaxial strained strontium titanate films
Tyunina, M.; Nepomniashchaia, N.; Vetokhina, V.; Dejneka, A. (2020-08-24)
Tyunina, M., Nepomniashchaia, N., Vetokhina, V., & Dejneka, A. (2020). Optics of epitaxial strained strontium titanate films. Applied Physics Letters, 117(8), 082901. https://doi.org/10.1063/5.0021461
© Published under license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Tyunina, M., Nepomniashchaia, N., Vetokhina, V., & Dejneka, A. (2020). Optics of epitaxial strained strontium titanate films. Applied Physics Letters, 117(8), 082901. https://doi.org/10.1063/5.0021461 and may be found at https://doi.org/10.1063/5.0021461.
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https://urn.fi/URN:NBN:fi-fe2020112492779
Tiivistelmä
Abstract
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.
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