Unidirectional Invisibility Induced by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">P</mml:mi><mml:mi mathvariant="script">T</mml:mi></mml:math>-Symmetric Periodic Structures
Zin Lin, Hamidreza Ramezani, Toni Eichelkraut, et al.·2011·Physical Review Letters