Abstract
We show the possibility of achieving nonreciprocal wave propagation in space-time modulated media and give an asymptotic analysis of the nonreciprocity property in terms of the amplitude of the time modulation. Such modulation causes a folding of the band structure of the material, which may induce degenerate points. By breaking time-reversal symmetry, we show that these degeneracies may open into nonsymmetric, unidirectional band gaps. Finally, we illustrate our results by several numerical simulations.
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