Low-coverage alkali metal adsorption on the Ge(0 0 1)-p(1×2) surface

Alkali metals adsorbed on Ge(0 0 1)-p(1×2) exhibit a variety of atomic arrangements depending on the coverage. We present theoretical investigation of a quasi-isolated alkali atom adsorption on the Ge(0 0 1)-p(1×2) surface, with and without a missing-dimer defect. Stable adsorption sites are found and the corresponding adsorption energies are compared. For completeness, STM images are simulated for the energetically most favourable atomic configurations.