Optics of epitaxial strained strontium titanate films

Tyunina, M.; Nepomniashchaia, N.; Vetokhina, V.; Dejneka, A. (2020-08-24)
 
Avaa tiedosto
Lataukset: 

URL:
https://doi.org/10.1063/5.0021461

Tyunina, M.
Nepomniashchaia, N.
Vetokhina, V.
Dejneka, A.
American Institute of Physics
24.08.2020

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

https://rightsstatements.org/vocab/InC/1.0/
© 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.
https://rightsstatements.org/vocab/InC/1.0/
doi:https://doi.org/10.1063/5.0021461
Näytä kaikki kuvailutiedot
Julkaisun pysyvä osoite on
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.

Kokoelmat