论文标题
高阶谐波世代倾斜的Weyl半法
High-order harmonic generations in tilted Weyl semimetals
论文作者
论文摘要
我们研究了两种类型的Weyl锥的比较，研究了高阶谐波世代（HHGS）。由于倍或电子袋的结构，在单个II型WEYL点附近观察到高阶的强核代相对世代，尤其是在频率零时。事实证明，这种显着的直流信号在光谱分解后具有映射过渡具有归因。在弱脉冲电场下，非倾斜Weyl锥的线性光学响应与Kubo理论一致。通过更多的数值模拟，我们得出结论，非零化学势可以增强偶数世代相传，从稍微倾斜的系统到倾斜的系统。考虑到动态对称性，I型和-II Weyl锥在圆形极化的光下也显示出不同的选择性响应。最后，使用包含两个Weyl点的更真实的模型，我们证明了具有相反手性的配对的Weyl点可以抑制整体均匀的世代。
We investigate high-order harmonic generations (HHGs) under the comparison of Weyl cones in two types. Due to the hyperboloidal electron pocket structure, strong noncentrosymmetrical generations in high orders are observed around a single type-II Weyl point, especially at frequency zero. Such remarkable DC signal is proved to have attributions from the intraband transition after spectral decomposition. Under weak pulse electric field , the linear optical response of a non-tilted Weyl cone is consistent with the Kubo theory. With more numerical simulations, we conclude the non-zero chemical potential can enhance the even-order generations, from the slightly tilted system to the over-tilted systems. In consideration of dynamical symmetries, type-I and -II Weyl cones also show different selective responses under the circularly polarized light. Finally, using a more realistic model containing two pairs of Weyl points, we demonstrate the paired Weyl points with opposite chirality could suppress the overall even-order generations.
