拓扑自旋织构中运动电子的高次谐波产生
High harmonic generation from electrons moving in topological spin textures
AI总结：
本研究数值分析时间反演对称性破缺的自旋标量手性态中电子与拓扑自旋织构耦合产生的HHG，揭示低频频场下标量手性通过反常速度调制电子-空穴对轨迹并影响纵向响应。
摘要：
高次谐波产生（HHG）是一种引人注目的现象，反映了电子的超快动力学。近年来，研究已证明HHG不仅可用于重构能带结构，还可用于重构以Berry曲率表征的几何结构。在此，我们数值研究了在时间反演对称性破缺的自旋标量手性态中，与拓扑自旋织构耦合的电子所产生的HHG。在该系统中，标量手性的符号变化会改变Berry曲率的符号，同时保持能带结构不变，这使我们能够讨论几何因素对HHG的纯粹影响。值得注意的是，我们发现当光频率显著低于能隙时，标量手性的符号会显著影响平行于光场的纵向响应，而非横向响应。我们的分析表明，这可归因于电子-空穴对复合所诱导的带间电流，而这些电子-空穴对的实空间轨迹受到反常速度项的调制。
英文摘要：
High harmonic generation (HHG) is a striking phenomenon, which reflects the ultrafast dynamics of electrons. Recently, it has been demonstrated that HHG can be used to reconstruct not only the energy band structure but also the geometric structure characterized by the Berry curvature. Here, we numerically investigate HHG arising from electrons coupled with a topological spin texture in a spin scalar chiral state where time reversal symmetry is broken. In this system, a sign change in scalar chirality alters the sign of the Berry curvature while keeping the energy band structure unchanged, allowing us to discuss purely geometrical effects on HHG. Notably, we found that, when the optical frequency is significantly lower than the energy gap, the sign of scalar chirality largely affects the longitudinal response parallel to the optical field rather than the transverse response. Our analysis suggests that this can be attributed to interband currents induced by the recombination of electron-hole pairs whose real-space trajectories are modulated by the anomalous velocity term.
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