Abstract
We realize the unidirectional reflectionless light propagation in metal-insulator-metal plasmonic waveguide side-coupled with two resonators based on bulk Dirac semimetal (BDS). This phenomenon is observed at exceptional points where the parity-time symmetry is broken, and near perfect absorption is obtained. Based on the dynamic tunability of BDS, the ultra-compact structure with adjustable unidirectional reflectionlessness can be achieved due to low scattering loss. Our results show a potential for developing integrated plasmonic devices such as active mid-infrared sensors, diodes, and absorbers.
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