Two-band model description of electroabsorption and third-harmonic generation in 1-D MX linear chains

Z. Shuai*, Jean-Luc Bredas, A. Saxena, J. T. Gammel, A. R. Bishop

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Within a two-band model, we investigate the electroabsorption (EA) and third-harmonic generation (THG) processes in halogen-bridged mixed-valence Pt complexes: PtCl, PtBr and Ptl. For PtCl, the theoretical THG spectrum shows three peaks, corresponding to (i) a three-photon resonance at 0.83 eV originating in a M(etal)-M(etal) transition; (ii) a two-photon resonance at 1.5 eV from an M-M band-edge transition; and (iii) a three-photon resonance at 1.6 eV from an M-X transition. The latter two peaks account well for the twin-peak structure seen experimentally. We show that the twin-peak intensity strongly decreases from PtCl to PtBr and disappears for Ptl. We also discuss the theoretical EA spectra due to localized defects (polarons, bipolarons, kinks, and excitons).

Original languageEnglish (US)
Pages (from-to)1685-1686
Number of pages2
JournalSynthetic Metals
Volume71
Issue number1-3
DOIs
StatePublished - Apr 1 1995

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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