A condensed-matter spin model with antiferromagnetic coupling is predicted to exhibit an emergent dual axion field in its effective electromagnetic response.
Al` u, First-principles homogenization theory for pe- riodic metamaterials, Physical Review B84, 075153 (2011)
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Emergence of dual axion response in condensed matter
A condensed-matter spin model with antiferromagnetic coupling is predicted to exhibit an emergent dual axion field in its effective electromagnetic response.