Electronic state on the surface in the strongly correlated electron systems Original Research Article

In order to clarify the tunneling spectroscopy in high-TcTc cuprates, we study electronic state of the surface in the strongly correlated electron systems. First, we obtain Greenʹs function of strongly correlated normal bulk system using the fluctuation exchange (FLEX) approximation. Next, we insert infinite potential into the bulk system and obtain Greenʹs function of surface. We find that the density of states (DOS) in strongly correlated bulk systems are different from that on the surface, and the difference decreases as the magnitude of Coulomb interaction (U)(U) increases