Analytical model for molecular-scale charge transport

We demonstrate a simple analytical model for elastic charge transport on th e nanometer scale within a single molecule. It is based on the assumptions usually employed for quantum chemical calculations, except that of equilibr ium between the currents flowing in opposite directions. It allows the poss ibility of a nonuniform potential distribution and imbalance between the po pulation of states of opposite momentum. We analyze two implementable confi gurations and find the predictions to be consistent with recent experimenta l results.