Topological spin excitations of Heisenberg antiferromagnets in two dimensions

TL;DR

This paper explores vortex-like topological spin excitations in 2D Heisenberg antiferromagnets, revealing Dirac fermion characteristics for half-integer spins and discussing their experimental and theoretical significance.

Contribution

It introduces a Schwinger-boson framework to construct and analyze topological spin excitations, highlighting their Dirac fermion nature for half-integer spins, a novel insight.

Findings

Topological spin excitations are Dirac fermions with a gap for half-integer spins.

The study provides a new perspective on the dynamics of vortex-like excitations.

Implications for experiments and theory are under investigation.

Abstract

In this paper we discuss the construction and the dynamics of vortex-like topological spin excitations in the Schwinger-boson description of Heisenberg antiferromagnets in two dimensions. The topological spin excitations are Dirac fermions (with gap) when spin value $S$ is a half-integer. Experimental and theoretical implications of these excitations are being investigated.