Role of small polarons in the metal-insulator transition

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

    Research output: Contribution to journalArticlepeer-review


    An analysis of the effects of small polaron formation on the metal-insulator transition as expressed in terms of the Hubbard model is presented. The system dealt with contains an electronic subsystem and a rigid lattice of polarizable molecules. The electron-excitation coupling is treated by a canonical transformation that leads to reduced Hubbard constants for both the Coulomb interaction and the bandwidth. Polaron formation leads in addition to the creation of a polarization bond in the crystal. This contribution to the total cohesive energy of the solid is shown to be equal in magnitude to the polaron binding energy. The effective antiferromagnetic exchange interaction (via virtual charge transfer) is calculated for both excitonic and phononic polarons. A discussion of the effect of increased polarizability is presented with emphasis on the possibility of stabilizing the metallic phase at low temperatures in real crystals.

    Original languageEnglish (US)
    Pages (from-to)2336-2344
    Number of pages9
    JournalThe Journal of Chemical Physics
    Issue number6
    StatePublished - 1973

    ASJC Scopus subject areas

    • General Physics and Astronomy
    • Physical and Theoretical Chemistry


    Dive into the research topics of 'Role of small polarons in the metal-insulator transition'. Together they form a unique fingerprint.

    Cite this