【摘 要】
：
Non-Hermitian topological systems,by combining the advantages of topological robustness and sensitivity induced by non-Hermiticity,have recently emerged and attracted much research interest.Here,we propose a device based on the topological coupler in elas
【机 构】
：
Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China;Department of Phys
【出 处】
：
中国科学：物理学 力学 天文学（英文版）
论文部分内容阅读
Non-Hermitian topological systems,by combining the advantages of topological robustness and sensitivity induced by non-Hermiticity,have recently emerged and attracted much research interest.Here,we propose a device based on the topological coupler in elastic waves with non-Hermiticity,which contains two topological domain walls and four ports.In this device,topological robustness routes the transmission of waves,while non-Hermiticity controls the gain or loss of waves as they propagate.These mechanisms result in continuous and quantitative control of the energy distribution ratio of each port.A non-Hermitian Hamiltonian is introduced to reveal the coupling mechanism of the topological coupler,and a scattering matrix is proposed to predict the energy distribution ratio of each port.The proposed topological coupler,which provides a new paradigm for the non-Hermitian topological systems,can be employed as a sensitive beam splitter or a coupler switch.Moreover,the topological coupler has potential applications in information processing and logic operation in elastic circuits or networks,and the paradigm also applies to other classical systems.
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