Geometric phases and the magnetization process in quantum antiferromagnets
arXiv:0712.4316 · doi:10.1103/PhysRevB.79.064412
Abstract
The physics underlying the magnetization process of quantum antiferromagnets is revisited from the viewpoint of geometric phases. A continuum variant of the Lieb-Schultz-Mattis-type approach to the problem is put forth, where the commensurability condition of Oshikawa {\it et al} derives from a Berry connection formulation of the system's crystal momentum. %, similar to that developed by Haldane for ferromagnets. %Building on the physical picture which arises, We then go on to formulate an effective field theory which can deal with higher dimensional cases as well. We find that a topological term, whose principle function is to assign Berry phase factors to space-time vortex objects, ultimately controls the magnetic behavior of the system. We further show how our effective action maps into a gauge theory under certain conditions, which in turn allows for the occurrence of a fractionalized phase with topological order.
Substantial enhancement from previous submission; added new section on fractionalized phases
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