Optical Absorption Spectra of A_6C_<60> : Reduction of Effective Coulomb Interactions

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概要

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• We theoretically investigate optical absorption spectra of C^<6->_<60>, and discuss their relations with the optical properties of alkali metal-doped fullerides A_6A_<60>. We use a tight binding model with long-range Coulomb interactions and bond disorder. Frenkel exciton effects are taken into account by the Hartree-Fock approximation and the CI method. We find that the Coulomb interaction parameters relevant to the optical spectra of A_6A_<60> are almost half of those of the neutral C_<60>. This finding is closely related with the experimental result that dielectric constants of fullerides maximally doped with alkali metals become about twice as large as those of the neutral systems.

• 社団法人応用物理学会の論文
• 1994-08-01

著者

• Harigaya Kikuo

  Fundamental Physics Section Physical Science Division Electrotechnical Laboratory

• Harigaya Kikuo

  Fundamental Physics Section Electrotechnical Laboratory

関連論文

• Dispersion of the Third-Order Nonlinear Optical Susceptibility in C_60 Calculated with a Tight-Binding Model
• Polaron Excitations in Fullerenes : Theory as π-Conjugated Systems
• Optical Absorption Spectra of A_6C_ : Reduction of Effective Coulomb Interactions
• Optical Absorption in Higher Fullerenes : Effects of Symmetry Reduction
• Lattice and Electronic Structures of Undoped and Doped C_ Molecules by the Extended Su-Schrieffer-Heeger Model

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