论文标题
石墨烯中的高阶谐波产生：内部和带间过渡的非线性耦合
High-order harmonic generation in graphene: nonlinear coupling of intra and interband transitions
论文作者
论文摘要
我们使用量子主方程方法研究石墨烯中的高阶谐波产生（HHG）。这些模拟在椭圆极化的光下重现了石墨烯中观察到的HHG的增强[N. Yoshikawa等人，Science 356，736（2017）]。根据发射高阶谐波的显微镜分解，我们发现HHG的增强源于内键和带中的复杂的非线性耦合，这些耦合是由椭圆形光的垂直电场成分所引起的，这些内标和带的频带跃迁分别引起。此外，我们揭示了来自不同激发通道的贡献彼此破坏性干扰。这一发现表明，通过阻止一部分通道并通过带隙或化学潜在的操纵来取消破坏性干扰，从而有可能增强HHG的途径。
We investigate high-order harmonic generation (HHG) in graphene with a quantum master equation approach. The simulations reproduce the observed enhancement in HHG in graphene under elliptically polarized light [N. Yoshikawa et al, Science 356, 736 (2017)]. On the basis of a microscopic decomposition of the emitted high-order harmonics, we find that the enhancement in HHG originates from an intricate nonlinear coupling between the intraband and interband transitions that are respectively induced by perpendicular electric field components of the elliptically polarized light. Furthermore, we reveal that contributions from different excitation channels destructively interfere with each other. This finding suggests a path to potentially enhance the HHG by blocking a part of the channels and canceling the destructive interference through band-gap or chemical potential manipulation.
