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By considering a correlated two-electron transport process (TET) and using adiagrammatic analysis within the Keldysh nonequilibrium Green's functionformalism, we discuss a novel charge pump by which carriers are pumped from acontact with low chemical potential to another contact with a higher potential.The TET process involves two correlated incident electrons scattering andexchanging energy with each other. The process can significantly affect chargecurrent density and it involves high empty states and/or low filled states ofthe Fermi liquid of the leads.Comment: 4 pages, 4 figures, revte

Correlated two-electron transport: A principle for a charge pump