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(a) Details of the superexchange model. Small red and blue triangles are non-magnetic ions of two different types mediate superexchange of strengths J △ = J(1 + ∆)/2 and J ▽ = J(1 − ∆)/2. (b) The resulting spin model has exchange interactions of strengths J in the bulk (black solid lines), J(1+ ∆)/2 on red dotted external edges, and J(1 − ∆)/2 on blue dashed external edges.
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We investigate the emergence of helical edge modes in a Heisenberg antiferromagnet on a triangular lattice, driven by a topological mechanism similar to that proposed by Dong et al. [Phys. Rev. Lett. 130, 206701 (2023)] for chiral spin waves in ferromagnets. The spin-frame field theory of a three-sublattice antiferromagnet allows for a topological...
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