Finite-width axion domain walls generically support a localized normalizable chiral electromagnetic mode with linear gapless dispersion arising from helicity-dependent coupling to the axion gradient.
Axion electrodynamics: Green’s functions, zero-point energy and optical activity,
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Localization of Chiral Electromagnetic Waves on Thick Axion Domain Walls
Finite-width axion domain walls generically support a localized normalizable chiral electromagnetic mode with linear gapless dispersion arising from helicity-dependent coupling to the axion gradient.