Electronic Structure and Charge Distribution in the C60‐FET

Abstract

We study the charge profile of a C60‐FET (field effect transistor) as used in the experiments of Schon, Kloc and Batlogg. In the first part we consider the charge profile in the interface layers. We find that the induced charge is spread out over several layers at low doping and becomes confined to the first layer at high doping, i.e. the regime where superconductivity is observed. In the second part we refine our model in order to study the charge profile within a single layer. We find that the electric field gives rise to a molecular Stark which leads to a splitting of the energy levels.