Research on Electronic Structure of Alkali overlayer on Semiconductors and Metals

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The aim of this project is to give a general method for calculation of the electronic structure of the adatom-surface system.The process and results are as follows;(1986/4-1987/3)First a formulation for the electronic structure of a surface random system was tried in the central-site-coherent-potential approximation.It was found that the approximation gives a foundamental difficulty.Second the boundary-site-CPA was adopted and rather reasonable results were obrained.(1987/4-1988/3)Above approximation has a limitation that it can be adopted only the system with a nearest neighbor hopping.The present system has more distant hopping.To include this effect,the Cell-CPA is adopted and the numerical results for alkali on Si(100)explain the characteristic feature of the coverage dependence of the eotk function and the electronic structure.