论文标题
扭曲双层石墨烯的高阶非线性光学响应
High-order nonlinear optical response of a twisted bilayer graphene
论文作者
论文摘要
为了关注最小相称结构的扭角，我们在激光场下进行了扭曲的双层石墨烯（TBG）中电子动力学的非扰动计算。我们表明，TBG表现出丰富的高谐波一代，而单层或传统的双层中不可能发生。我们通过分析动力对称性，动量分辨动力学以及层间耦合的作用来阐明这些非线性响应的机制。我们的结果暗示非线性“ optotwistronics”或通过人造曲折控制分层材料的光学性质。
Focusing on the twist angle for the minimal commensurate structure, we perform nonperturbative calculations of electron dynamics in the twisted bilayer graphene (TBG) under intense laser fields. We show that the TBG exhibits enriched high-harmonic generation that cannot occur in monolayer or conventional bilayers. We elucidate the mechanism of these nonlinear responses by analyzing dynamical symmetries, momentum-resolved dynamics, and roles of interlayer coupling. Our results imply nonlinear "optotwistronics," or controlling optical properties of layered materials by artificial twists.
