Abstract
We examine the behaviour of 2 electrons on a 2 x 2 square lattice sites. The Hubbard model was used to model the system and was diagonalized using the configuration interaction method which is a variational method. The variations of the ground state energy ground state double occupied sites D, and the ground state kinetic energy with the interaction strength (u 0) were examined. The functions and were found to be parabolic functions of. This suggests that superconductivity is driven by both electron and hole doping. Key words: Hubbard model, Superconductivity, Configuration interaction and Electron correlation.
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