论文标题
Weyl半法中的3D拓扑等离子体
3D Topological Plasmons in Weyl Semimetals
论文作者
论文摘要
我们系统地研究了磁场存在的Weyl半法中散装，表面和边缘等离子体的性质。发现在不同表面上存在具有不同特性的单向等离子体，这与三维（3D）块状等离子体的非平凡拓扑相符。这些新型的等离子具有动量锁定锁，并可能在表面之间传播。异常的霍尔电导率带来了丰富的各向异性等离子体分散体，从线性到抛物线带甚至双曲线带。借助半经典图片，用于形成Weyl Orbits，我们指出，相对表面的Fermi-Arc等离子可以构成另一个独特的3D拓扑等离子体。此外，还有一个无间隙的单向边缘等离子体，该边缘受拓扑保护，其方向和位置可以由外部场控制。因此，我们的工作揭示了Weyl等离子的拓扑特征，Weyl等离子体可能在基于手性/拓扑等离子体学的光电设备中具有重要的应用。
We systematically investigate the properties of bulk, surface and edge plasmons in Weyl semimetals in presence of a magnetic field. It is found that unidirectional plasmons with different properties exist on different surfaces, which is in consistent with the nontrivial topology of the three-dimensional (3D) bulk plasmons. These novel plasmons possess momentum-location lock and may travel between surfaces. The anomalous Hall conductivity brings about abundant anisotropic plasmon dispersions, from linear to parabolic or even hyperbolic bands. With the help of a semiclassical picture for the formation of the Weyl orbits, we point out the Fermi-arc plasmons at opposite surfaces can make up another unique 3D topological plasmon. Furthermore, there is a gapless unidirectional edge plasmon protected by the topology whose direction and position can be controlled by external field. Our work thus uncovers topological features of Weyl plasmons, which may have important applications in photoelectric devices based on chiral/topological plasmonics.
