Nonlinear Optical Response from Excitons in Soliton Lattice Systems of Doped Conducting Polymers

Details Nonlinear Optical Response from Excitons in Soliton Lattice Systems of Doped Conducting Polymers Nonlinear Optical Response from Excitons in Soliton Lattice Systems of Doped Conducting Polymers

1996-02-14

arxiv.org/abs/cond-mat/9602079v2

Jap.J.Appl.Phys. 36 (1997) L556-L559

Physics

Condensed Matter

To be published in Jpn. J. Appl. Phys. (Letters)

Scientific paper

10.1143/JJAP.36.L556

Exciton effects on conjugated polymers and the resulting optical nonlinearities are investigated in soliton lattice states. We use the Su-Schrieffer-Heeger model with long-range Coulomb interactions for electrons. The third-harmonic generation (THG) at off-resonant frequencies is calculated as functions of the soliton concentration and the chain length of the polymer. The magnitude of the THG with 10 percent doping increases by the factor of about 10^2 from that of the neutral system. The large increase of the order two is common for several Coulomb interaction strengths, and is seen in open systems as well as in periodic systems.

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