Interacting Fermion Theory of the Commensurate-Incommensurate System

Abstract

The free Fermion theory for an assembly of physisorbed atoms on an anisotropic rectangular lattice contains an unphysical process; an exchange of two adjacent domain walls. To remove such exchange, we develop here a revised approach which may be called the “interacting Fermion approach”. The revised model is analyzed by means of RPA. It is shown that the IC₂ phase found in our previous report based upon the free Fermion model is retained in the revised model.