论文标题
有限薄片中高阶谐波产生的拓扑边缘状态贡献
Topological edge-state contributions to high-order harmonic generation in finite flakes
论文作者
论文摘要
边缘状态在拓扑绝缘子的电子动力学中起着重要作用，因为它们是此类材料中唯一的一部分。在这项工作中，我们考虑了2D拓扑绝缘子的Haldane模型，并经历了强烈的激光场。我们将大部分Haldane模型中的数值模拟高谐波生成（HHG）与具有边缘状态的相应有限薄片中的HHG进行了比较，并解释了差异。特别是，在散装带隙以下的能量峰出现在有限薄片的光谱中。这些峰的位置显示出对薄片尺寸的强烈依赖，可以使用边缘状态的分散关系来解释。
Edge states play a major role in the electron dynamics of topological insulators as they are the only conducting part in such materials. In this work, we consider the Haldane model for a 2D topological insulator, subjected to an intense laser field. We compare the numerically simulated high-harmonic generation (HHG) in the bulk of the Haldane model to HHG in corresponding finite flakes with edge states present, and explain the differences. In particular, peaks for energies below the bulk band gap appear in the spectra for the finite flakes. The positions of these peaks show a strong dependence on the size of the flakes, which can be explained using the dispersion relation for the edge states.
