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Accessible phases via wave impedance engineering with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="italic">PT</mml:mi></mml:mrow></mml:math> -symmetric metamaterials
Optical systems that respect parity-time ($\mathit{PT}$) symmetry can be realized with proper incorporation of gain/loss materials. However, due to the absence of magnetic response at optical frequencies, the wave impedance is defined entirely by their permittivity and, hence, the $\mathit{PT}$-symmetric character is controlled solely via their refractive index. Here, we …