ELECTRONIC TRANSFER BETWEEN LOW-DIMENSIONAL NANOSYSTEMS

摘要

The irreversible transfer of electrons or holes between zero-dimensional semiconductor nanostructures is considered theoretically. The mechanism can apply to quantum dot samples, molecular crystals, polymer solids, DNA molecule, etc. The transfer mechanism is studied using a model with inter-molecular electron tunneling mechanism and with the coupling of the charge carrier to the intra-molecular or intra-quantum dot atomic vibrations. The electron-phonon interaction is considered in the self-consistent Born approximation to the nonequilibrium Green's function self-energy. The corresponding kinetic equation shows us a specific diffusion mechanism of an electron along e.g. a molecular solid. This mechanism will be compared to the well-known Marcus theory of electronic transfer. With using the above mechanism we are able to explain earlier experimental data on photoconductivity in charge-transfer crystals, and also rather recent data on the electric conduction of DNA molecules.