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arXiv 2005.14418cond-mat.mes-hall
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应变Weyl半金属中的表面等离子体激元

Surface plasmon polaritons in strained Weyl semimetals

O. V. Bugaiko, E. V. Gorbar, P. O. Sukhachov

摘要:

研究了具有时间反演对称性破缺的外尔半金属应变平板中的表面等离子体激元。结果发现,应变诱导的轴向规范场降低了这些集体模式的波矢的中间值的频率。依赖于动量空间中Weyl节点分离的相对取向、表面法线和传播方向,表面等离子体激元的色散关系即使在薄板中也可以是非互易的。此外,应变诱导的轴向规范场会显著影响集体模的局域化特性。这些效应允许在原位控制外尔半金属中表面等离子体激元的传播,并可能用于创建非互易器件。

英文摘要:

Surface plasmon polaritons in a strained slab of a Weyl semimetal with broken time-reversal symmetry are investigated. It is found that the strain-induced axial gauge field reduces frequencies of these collective modes for intermediate values of the wave vector. Depending on the relative orientation of the separation of Weyl nodes in momentum space, the surface normal, and the direction of propagation, the dispersion relation of surface plasmon polaritons could be nonreciprocal even in a thin slab. In addition, strain-induced axial gauge fields can significantly affect the localization properties of the collective modes. These effects allow for an in situ control of the propagation of surface plasmon polaritons in Weyl semimetals and might be useful for creating nonreciprocal devices.

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