Non Metallic Transport in Molecular Solids versus Dimensionality

Abstract

Path integral techniques and Green functions formalism are applied to study the (time) temperature dependent scattering of a polaronic quasiparticle by a local anharmonic potential in a bath of diatomic molecules. The electrical resistivity has been computed in any molecular lattice dimensionality for different values of electron-phonon coupling and intermolecular forces. A broad resistivity peak with non metallic behavior at temperatures larger than $\simeq 100K$ is predicted by the model for sufficiently strong polaron-local potential coupling strengths. This peculiar behavior, ascribed to purely structural effects, is favoured in low dimensionality.

Keywords: Path Integrals, Polarons, Anharmonicity PACS: 31.15.Kb, 63.20.Ry, 66.35.+a

References in corpus (6)

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