TOPOLOGICAL EXCITATIONS, SPIN WAVES AND THE ORIGIN OF MASS

Abstract

Topological aspects of low energy excitations in the form of spin-waves in ferromagnetic systems are studied here. It is pointed out that the generation of spin-waves in three-dimensional Ising fermions can be visualized through the change in chirality. The characteristic features of spin-waves in both the phases of a continuous symmetric XY model are also studied. It is argued that the mass generation of these low energy excitations has a topological origin.