University of Oulu

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

Optics of epitaxial strained strontium titanate films

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Author: Tyunina, M.1,2; Nepomniashchaia, N.2; Vetokhina, V.2;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P. O. Box 4500, FI-90014 Oulu, Finland
2Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
Format: article
Version: published version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020112492779
Language: English
Published: American Institute of Physics, 2020
Publish Date: 2021-08-24
Description:

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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Series: Applied physics letters
ISSN: 0003-6951
ISSN-E: 0003-6951
ISSN-L: 0003-6951
Volume: 117
Issue: 8
Article number: 082901
DOI: 10.1063/5.0021461
OADOI: https://oadoi.org/10.1063/5.0021461
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: The authors would like to thank T. Kocourek, O. Pacherova, and D. Chvostova for their contributions and advise. The authors acknowledge support from the Czech Science Foundation (Grant No. 19-09671S) and the European Structural and Investment Funds and the Ministry of Education, Youth and Sports of the Czech Republic through Programme “Research, Development and Education” (Project No. SOLID21-CZ.02.1.01/0.0/0.0/16_019/0000760).
Copyright information: © 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.