论文标题
各向异性狄拉克系统中的等离子体
Plasmons in anisotropic Dirac systems
论文作者
论文摘要
我们考虑各向异性二维狄拉克系统中的等离子体激发，无论是各向异性石墨烯还是拓扑绝缘子的表面。概括确切的密度密度响应函数一个人发现了已经处于最低频率的各向异性的等离子体分散体。在此制度中获得分散体获得渐近表达。我们表明，各向异性狄拉克系统的完整材料类别的等离子体特性仅以二小无材料参数为特征。强大的各向异性可用于引导等离子体模式，从而将新功能引入狄拉克等化性领域。
We consider the plasmon excitations in anisotropic two-dimensional Dirac systems, be it either anisotropic graphene or surfaces of topological insulators. Generalizing the exact density-density response function one finds a plasmon dispersion that is anisotropic already at the lowest frequencies. Asymptotic expressions are obtained for the dispersion in this regime. We show that the plasmon properties of the complete material class of anisotropic Dirac systems are characterized by just two dimensionless material parameters. The strong anisotropy can be used to guide the plasmon modes, introducing new functionalities to the field of Dirac plasmonics.
