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arXiv · 1701.04320

Giant Non-reciprocity Near Exceptional Point Degeneracies

Roney Thomas·Huanan Li·F. M. Ellis·Tsampikos Kottos
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Abstract

We show that gyrotropic structures with balanced gain and loss that respect anti-linear symmetries exhibit a giant non-reciprocity at the so-called exact phase where the eigenfrequencies of the isolated non-Hermitian set-up are real. The effect occurs in a parameter domain near an exceptional point (EP) degeneracy, where mode-orthogonality collapses. The theoretical predictions are confirmed numerically in the microwave domain, where a non-reciprocal transport above 90dB is demonstrated, and are further verified using lump-circuitry modeling. The analysis allows us to speculate the universal nature of the phenomenon for any wave system where EP and gyrotropy can co-exist.

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Roney Thomas, Huanan Li, F. M. Ellis, Tsampikos Kottos. 2017-01-10. Giant Non-reciprocity Near Exceptional Point Degeneracies. https://doi.org/10.1103/physreva.94.043829

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