Title
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Many-body large polaron optical conductivity in
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Author
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Abstract
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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. |
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Language
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English
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Source (journal)
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Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
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Publication
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Lancaster, Pa
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2010
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ISSN
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1098-0121
[print]
1550-235X
[online]
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DOI
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10.1103/PHYSREVB.81.125119
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Volume/pages
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81
:12
(2010)
, p. 125119,1-125119,9
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ISI
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000276248900056
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Full text (Publisher's DOI)
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Full text (open access)
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