Excitonic polarons in molecular crystals

P. M. Chaikin, A. F. Garito, A. J. Heeger

    Research output: Contribution to journalArticlepeer-review


    Band narrowing and band shifts due to excitonic-polaron formation are considered for an electronically polarizable medium. Experimental evidence of such effects in molecular crystals is cited. The central result is that the electron-exciton interaction in the strong-coupling regime leads not only to an indirect attractive electron-electron interaction, but also because of small-polaron formation leads to severe band narrowing. This band narrowing tends to favor the insulating state. The implications of the excitonic polaron for the metal-insulator transition, organic semiconductors, and the question of the possible existence of superconductivity in organic molecular crystals are discussed.

    Original languageEnglish (US)
    Pages (from-to)4966-4969
    Number of pages4
    JournalPhysical Review B
    Issue number12
    StatePublished - 1972

    ASJC Scopus subject areas

    • Condensed Matter Physics


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