Antiferromagnetic Wess–Zumino term (source code)

= Antiferromagnetic Wess–Zumino term
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In a bipartite antiferromagnet, the smooth staggered contributions to the spin Wess--Zumino terms cancel between sublattices. Their term linear in uniform canting is proportional to $\mathbf m\cdot(\mathbf n\times\partial_t\mathbf n)$.