带有韦尔半金属缺陷层的复合结构中的非互易传输

Xin Chen, Guanxia Yu, Haodong Wang
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引用次数: 0

摘要

设计了一种带有 WSMs 缺陷层的双单元对称复合结构。基于传递矩阵理论研究了其能带和传输特性。由于 WSMs 具有时间反向断裂的特性,对称复合结构的界面上激发了正向和反向入射的非互易 Tamm 态。数值结果表明,随着 WSM 厚度的增加,Tamm 态的非互易性增强。通过选择适当的介电层几何参数,可以在双带间隙中获得两对非互易色散曲线。本方案可应用于一些领域,如光隔离器和多通道非互易传输设备。
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Nonreciprocal transmission in composite structure with Weyl semimetal defect layer
A two-unit symmetrical composite structure with the WSMs defect layer was designed. The energy band and transmission properties are studied based on the transfer matrix theory. Due to the WSMs with the property of time-reversal breaking, the nonreciprocal Tamm states for forward and backward incidence are excited in the interface of the symmetrical composite structure. The numerical results show that the nonreciprocity of the Tamm states is enhanced with an increase in the WSMs thickness. By choosing the appropriate geometric parameters of dielectric layers, two pairs of nonreciprocal dispersive curves are obtained in the two-band gap. The present scenario can be applied in some areas, such as optical isolators and multi-channel nonreciprocal transmission devices.
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