Electron-phonon interaction and optical spectra of metals

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dc.creatorKaufmann, H. J.
dc.creatorMaksimov, E. G.
dc.creatorSalje, E. K. H.
dc.date1998-05-11
dc.date.accessioned2026-07-07T03:10:31Z
dc.date.available2026-07-07T03:10:31Z
dc.descriptionObserved optical reflectivity in the infrared spectral region is compared with theoretical predictions in a strongly coupled electron-phonon system. Starting from a Froehlich Hamiltonian, the spectral functions and their temperature dependence are derived. A full analysis including vertex corrections leads to an expression for the optical conductivity σ(ω) which can be formulated in terms of the well known optical conductivity for a quasi-isotropic system without vertex corrections. A numerical comparison between the full result and the so-called ``extended'' Drude formula, its weak coupling expansion, show little difference over a wide range of coupling constants. Normal state optical spectra for the high-T_c superconductors YBa_2Cu_3O_7 and La_{2-x}Sr_{x}CuO_4 at optimal doping are compared with the results of model calculations. Taking the plasma frequency and ε_\infty from band structure calculations, the model has only one free parameter, the electron-phonon coupling constant λ. In both materials the overall behaviour of the reflectivity can be well accounted for over a wide frequency range. Systematic differences exist only in the mid-infrared region. They become more pronounced with increasing frequency, which indicates that a detailed model for the optical response should include temperature dependent mid-infrared bands.
dc.description20 pages RevTex, 11 PostScript figures, 34 refs
dc.identifierhttps://arxiv.org/abs/cond-mat/9805108
dc.identifierhttp://arxiv.org/abs/cond-mat/9805108
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28262
dc.subjectSuperconductivity
dc.titleElectron-phonon interaction and optical spectra of metals
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