Translationally invariant polarons in conjugated conducting polymers

Hsin-Fei Meng, Chih Ming Lai

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A simple effective Hamiltonian for the electron-phonon coupling in the conjugated polymers is derived from the Su-Schrieffer-Heeger model with quantized lattice motions. Phonons correspond to lattice quantum fluctuations around the dimerized positions. Both acoustic and optical modes are considered. The energy-momentum relation for the polaron is calculated variationally, with the aid of Lee-Low-Pines transformation. The discrete translational invariance of an ideal conjugated polymer is explicitly enforced. Analytical expression for the polaron effective mass (Formula presented) is obtained. (Formula presented) turns out to be, in general, much larger than the conduction-band effective mass.

Original languageEnglish
Pages (from-to)13611-13617
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number20
StatePublished - 1 Jan 1997

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