Dual-frequency unidirectional reflectionlessness in a non-Hermitian quantum system of two different energy-level quantum dots coupled to a plasmonic waveguide

Dual-frequency unidirectional reflectionlessness is investigated in a quantum system consisting of a two-level and a V-type three-level quantum dots coupled to a plasmonic waveguide based on electromagnetically induced transparency-like effect. The results show that the dual-frequency unidirectional reflectionlessness can be obtained by appropriately adjusting the phase shift between two quantum dots, decay rates of quantum dots, and coupling strengths between quantum dots and plasmonic waveguide. Moreover, the dual-frequency low unidirectional reflection can be manipulated in the wide ranges of decay rates and coupling strengths.