Dependence of high-harmonic generation in twisted bilayer graphene on laser pulse ellipticity,Physical Review B

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Dependence of high-harmonic generation in twisted bilayer graphene on laser pulse ellipticity
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-10 , DOI: 10.1103/physrevb.110.115415
M. S. Mrudul ₁

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The ellipticity of a laser pulse offers a control knob to tune the efficiency and polarization of emitted higher-order harmonics. In this paper, we systematically investigate the ellipticity dependence of high-harmonic generation in various bilayer graphene systems, such as AA-stacked, AB-stacked, and twisted bilayer graphene. We demonstrate how the underlying symmetries and electronic band structures of different bilayer systems distinctly contribute to the characteristics of ellipticity dependence, such as elliptical enhancement and elliptical dichroism. Additionally, we showcase a unique applicability of high-harmonic spectroscopy as a tool for identifying stacking faults in bilayer graphene systems. Our findings offer valuable insights into the nonlinear optical interactions of twisted bilayer graphene with different twist angles.

中文翻译：

扭曲双层石墨烯中高次谐波的产生对激光脉冲椭圆率的依赖性

激光脉冲的椭圆率提供了一个控制旋钮来调节发射的高阶谐波的效率和偏振。在本文中，我们系统地研究了各种双层石墨烯系统（例如AA堆叠、AB堆叠和扭曲双层石墨烯）中高次谐波产生的椭圆率依赖性。我们展示了不同双层系统的基本对称性和电子能带结构如何明显影响椭圆度依赖性的特征，例如椭圆增强和椭圆二色性。此外，我们还展示了高次谐波光谱作为识别双层石墨烯系统中堆垛层错的工具的独特适用性。我们的研究结果为具有不同扭转角度的扭转双层石墨烯的非线性光学相互作用提供了有价值的见解。

更新日期：2024-09-10

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