外尔半金属薄膜的介电张量及色散性质研究DIELECTRIC TENSOR AND DISPERSION PROPERTIES OF WEYL SEMIMETAL THIN FILMS
王佐宏,钱黎明,郑改革
摘要(Abstract)：
外尔半金属(WSM)是一种以外尔费米子为准粒子的新型拓扑材料，具有优异的物理和光学特性。在光与WSM相互作用的过程中，材料的介电函数起到十分关键的作用。从修正的电位移矢量和电场强度关系出发，通过介电函数张量比较了不同费米能级情况下WSM介电常数的变化。在此基础上，引入4×4的磁光矩阵来求解麦克斯韦方程组，得到菲涅尔反射系数，研究波矢的色散方程。研究结果表明，WSM的色散在短波矢处具有线性色散，而在长波矢极限近似具有恒定频率。当WSM厚度的持续增大时，能够支持更多的模式分支。
关键词(KeyWords)： 外尔半金属;介电函数;色散;光学性质
基金项目(Foundation):
作者(Author): 王佐宏,钱黎明,郑改革
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