THEOREMS TO DEMOSTRATE THE PRESENCE OF ANTIFERROMAGNETISM IN THE PERIODIC ANDERSON MODEL.

Abstract

Anderson model is an important model in the theory of strongly correlated electron system. In this contribution, we introduce this model and the concept of electron correlation by bipartite lattice and prove rigorously theorems leading to the presence of spin singlet in the model. By using the results of Ueda et al (1992) and Tian (1994), we show theoretically that the ground state of the symmetric periodic Anderson model has a short – range order.