论文标题
在磁性拓扑绝缘子的域壁上第二次谐波生成的宽带增强
Broadband enhancement of second harmonic generation at the domain walls of magnetic topological insulators
论文作者
论文摘要
我们表明，在较大频率范围内的手性一维电子电流中，第二次谐波生成（SHG）得到了增强。增强的起源是双重的：首先，电流的线性分散和相关的等离子模式以及等离子体 - 波利顿的准线性色散导致相匹配条件的提升。此外，强场定位导致结构中SHG的进一步增加。结果表明，位于磁性拓扑绝缘子域壁上的手性电流可以是Terahertz频率范围内第二次谐波信号的有效来源。
We show that the second harmonic generation (SHG) is enhanced in the chiral one-dimensional electron currents in a broad frequency range. The origin of the enhancement is two-fold: first, the linear dispersion of the current and the associated plasmonic mode as well as the quasi-linear dispersion of plasmon-polariton result in the lift of the phase matching condition. Moreover, the strong field localization leads to the further increase of the SHG in the structure. The results suggest that the chiral currents localized at the domain walls of magnetic topological insulators can be an efficient source of second harmonic signal in the terahertz frequency range.
