摘要
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。
Weyl semimetals(WSMs)are novel topological materials with Weyl fermions as quasiparticles,which have excellent physical and optical properties.The dielectric function of the material plays a crucial role in the interaction between light and WSM.Based on the rela-tion between the modified electric displacement vector and the electric field intensity,the change of the dielectric constant of WSM under different Fermi energy levels is compared through the dielectric function tensor.On this basis,a 4×4 magneto-optical matrix is intro-duced to solve Maxwell's equations,to obtain the Fresnel reflection coefficients and to study the dispersion equations of the wave vector.The research results show that the dispersion of WSM has a linear dispersion at the short wavevector and an approximate constant frequency at the longer wavevector limit.As the thickness of the WSM continues to increase,more mode branches can be supported.
作者
王佐宏
钱黎明
郑改革
WANG Zuohong;QIAN Liming;ZHENG Gaige(School of Physics and Optoelectronic Engineering,Nanjing University of Information Science&Technology,Nanjing,Jiangsu 210044;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET),Nanjing University of Information Science&Technology,Nanjing,Jiangsu 210044)
出处
《物理与工程》
2023年第3期52-56,共5页
Physics and Engineering
关键词
外尔半金属
介电函数
色散
光学性质
Weyl semimetal
dielectric function
dispersion
optical propert
