  Artificial media provide 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. However, the external sources
in this structure do not induce dyon charges eliminating well-celebrated Witten
effect. We put forward the design of such nonreciprocal non-local metamaterial
and discuss its potential applications.
