Work Function of Alkali-Atom Adsorbed Graphite

Abstract

We propose a simple layer model in which real atomic configurations are simulated by multi-layers with homogeneous electron density on each layer, in order to investigate work function of alkali-atom adsorbed graphite. Charge transfer from an alkali-atom layer to graphite layers is determined within the model by minimizing total energy. The calculated decrease in work function of graphite upon alkali-atom adsorption agrees satisfactorily with the experimental data.