A Perturbation Theory of the Heisenberg Antiferromagnet

摘要

This dissertation concerns some physical properties of the ground state of the Helsenberg antlferromagnet. The approach is one of developing approximate series representations for various physical parameters by means of a modified Raylelgh-Schrodlnger perturbation theory.nIn Chapter II, the Heisenberg model is discussed, with emphasis on the problems inherent in treatments of the antlferromagnetlc lowest energy elgenstate. Chapter III involves the derivation of an effective Hamlltonlan, which is subsequently used in a modified perturbation theory. This modified perturbation theory is then proposed.