Title
Many-body large polaron optical conductivity in <tex>$SrTi_{1-x}Nb_{x}O_{3}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Volume/pages
81(2010) :12 , p. 125119,1-125119,9
ISSN
1098-0121
ISI
000276248900056
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Recent experimental data on the optical conductivity of niobium-doped SrTiO3 are interpreted in terms of a gas of large polarons with effective coupling constant αeff≈2. The theoretical approach takes into account many-body effects, the electron-phonon interaction with multiple LO-phonon branches, and the degeneracy and the anisotropy of the Ti t2g conduction band. Based on the Fröhlich interaction, the many-body large polaron theory provides an interpretation for the essential characteristics, exceptinterestinglyfor the unexpectedly large intensity of a peak at ∼130 meV, of the observed optical conductivity spectra of SrTi1−xNbxO3 without any adjustment of material parameters.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/266b38/7b04642b.pdf
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