平板波导的拓扑截止频率：拓扑绝缘体壁的穿透长度
Topological cutoff frequency in a slab waveguide: Penetration length in topological insulator walls
摘要：
研究了电磁波在三维拓扑绝缘体（3D TI）平板波导中的传播。结果表明，具有拓扑稳定性的截止频率限制了沿波导传播的频谱，并与实验观察一致。我们的方法也提供了一种方法来测量在3D TI的表面金属状态的渗透长度。
英文摘要：
We study the propagation of electromagnetic (EM) waves in a slab-type waveguide which walls consist of three-dimensional topological insulator (3D TI). The results show that a cutoff frequency with topological stability limits the spectrum that propagates along the waveguide and are in agreement with experimental observations. Our approach also provides a way to measure the penetration length of surface metallic states in 3D TI.
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