2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/210246We develop a theoretical approach to quantum transport through single conjugated organic molecules that accurately accounts for all molecular excited and ground states via a semi-empirical many-body molecular Hamiltonian. We then calculate the linear and non-linear transport properties of a benzenedithiol molecule covalently bonded to two gold electrodes at room temperature, eliminating all free parameters by comparing the calculated thermopower and linear-conductance with experiment. The resulting `molecular diamond' structure exhibits experimentally observed many-body effects inaccessible to mean-field approaches.A revised and significantly expanded treatment is given in arXiv:0812.0867Materials ScienceMesoscale and Nanoscale Physicstext