Path integral techniques and the Green’s function formalism are applied to study the time- and temperature-dependent scattering of a polaronic quasiparticle using a local anharmonic potential in a bath of diatomic molecules. The electrical resistivity has been computed for any molecular lattice dimensionality for different values of the electron–phonon coupling and intermolecular forces. Abroad resistivity peak with non-metallic behaviour at temperatures larger than 100Kis predicted by the model for sufficiently strong polaron–local potential coupling strengths. This peculiar behaviour, ascribed to purely structural effects, is favoured for low dimensionality.
Non Metallic Transport in Molecular Solids versus Dimensionality
ZOLI, Marco
2001-01-01
Abstract
Path integral techniques and the Green’s function formalism are applied to study the time- and temperature-dependent scattering of a polaronic quasiparticle using a local anharmonic potential in a bath of diatomic molecules. The electrical resistivity has been computed for any molecular lattice dimensionality for different values of the electron–phonon coupling and intermolecular forces. Abroad resistivity peak with non-metallic behaviour at temperatures larger than 100Kis predicted by the model for sufficiently strong polaron–local potential coupling strengths. This peculiar behaviour, ascribed to purely structural effects, is favoured for low dimensionality.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
