Thickness-Dependent Terahertz Permittivity of Epitaxially Grown PbTe Thin Films

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dc.citation.articleNumber1855en_US
dc.citation.issueNumber11en_US
dc.citation.journalTitleCoatingsen_US
dc.citation.volumeNumber13en_US
dc.contributor.authorKawahala, Nicolas M.en_US
dc.contributor.authorMatos, Daniel A.en_US
dc.contributor.authorRappl, Paulo H. O.en_US
dc.contributor.authorAbramof, Eduardoen_US
dc.contributor.authorBaydin, Andreyen_US
dc.contributor.authorKono, Junichiroen_US
dc.contributor.authorHernandez, Felix G. G.en_US
dc.contributor.orgSmalley-Curl Instituteen_US
dc.date.accessioned2024-05-08T18:56:13Zen_US
dc.date.available2024-05-08T18:56:13Zen_US
dc.date.issued2023en_US
dc.description.abstractThe exceptional thermoelectric properties of PbTe are believed to be associated with the incipient ferroelectricity of this material, which is caused by strong electron–phonon coupling that connects phononic and electronic dynamics. Here, we have used terahertz time-domain spectroscopy measurements to generate complex permittivity spectra for a set of epitaxially grown PbTe thin films with thicknesses between 100 nm and 500 nm at temperatures from 10 K to 300 K. Using a Drude–Lorentz model, we retrieved the physical parameters of both the phononic and electronic contributions to the THz permittivity. We observed a strong decrease, or softening, of the transverse optical phonon mode frequency with decreasing temperature, determining a thickness-independent negative ferroelectric-transition critical temperature, while we found a thickness-dependent anharmonic phonon decay lifetime. The electronic contribution to the permittivity was larger in thinner films, and both the carrier density and mobility increased with decreasing temperature in all films. Finally, we detected a thickness-dependent longitudinal optical phonon mode frequency, indicating the presence of plasmon–phonon coupling.en_US
dc.identifier.citationKawahala, N. M., Matos, D. A., Rappl, P. H. O., Abramof, E., Baydin, A., Kono, J., & Hernandez, F. G. G. (2023). Thickness-Dependent Terahertz Permittivity of Epitaxially Grown PbTe Thin Films. Coatings, 13(11), Article 11. https://doi.org/10.3390/coatings13111855en_US
dc.identifier.digitalcoatings-13-01855-v3en_US
dc.identifier.doihttps://doi.org/10.3390/coatings13111855en_US
dc.identifier.urihttps://hdl.handle.net/1911/115696en_US
dc.language.isoengen_US
dc.publisherMDPIen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleThickness-Dependent Terahertz Permittivity of Epitaxially Grown PbTe Thin Filmsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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