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Axion electrodynamics without Witten effect in metamaterials
Artificial media provide a unique playground to test fundamental theories, allowing one to probe the laws of electromagnetism in the presence of hypothetical axions. While some materials are known to realize this physics, here we propose the nonlocal extension of axion electrodynamics. Compared to the usual axion case, the suggested metamaterial features similar optical properties including Kerr and Faraday rotation.
Electromagnetic radiation in chiral matter: The Cherenkov case
Abstract Starting from the modified Maxwell equations in Carroll-Field-Jackiw electrodynamics we study the electromagnetic radiation in chiral matter characterized by an axion coupling θ(x)=bμxμ, with bμ=(0,b), which gives rise to the magnetoelectric effect. Employing the stationary phase approximation we construct the Green’s matrix in the radiation zone which allows the calculation of the corresponding electromagnetic potentials and fields for arbitrary sources.
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