Experimental demonstration of a unidirectional reflectionless parity-time metamaterial at optical frequencies
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...n critical value. Beyond this critical threshold the spectrum is no longer real, eigenvalues become complex even though PTĤ = ĤPT is still satisfied . PT symmetry has been studied both experimentally [4, 5, 6, 7, 8, 9, 10, 11, 12] and theoretically [13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23] in a variety of physical systems, with experiments performed electronic circuits on 4], nuclear magnetic[ resonance [5], optics [6, 7, 8...
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...[25] Liang Feng, Ye-Long Xu, William S Fegadolli, Ming-Hui Lu, José EB Oliveira, Vilson R Almeida, Yan-Feng Chen, and Axel Scherer, “Experimental demonstration of a unidirectional reflectionless parity-time metamaterial at optical frequencies,” Nature materials 12, 108 (2013)....
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