论文标题
薄手/扭曲材料和陀螺磁效果的光学旋转
Optical rotation in thin chiral/twisted materials and the gyrotropic magnetic effect
论文作者
论文摘要
通过非磁性物质的光的极化平面的旋转称为天然光学活性或光学陀螺术。这种效果在薄手性导体中的行为具有当前感兴趣。例如，手性3D晶体（称为旋转磁效应（GME））中的陀螺疗法的低频极限受电子的轨道磁矩控制，该轨道磁矩已被提议与扭曲的双层石墨烯中电流诱导的切换相关。我们表明，GME不仅限于散装材料，而且出现在第三方向融合的准2D系统中。从多频段库博公式开始，我们在低频光引起的准2D材料中得出了GME电流的通用表达，并提供了Feynman-Diaiagiamationation解释。还讨论了2D有限分层公式与3D散装公式之间的关系。
The rotation of the plane of polarization of light passing through a non-magnetic material is known as natural optical activity or optical gyrotropy. The behavior of this effect in thin chiral conductors is of current interest. For example, the low frequency limit of gyrotropy in chiral 3D crystals, known as the gyrotropic magnetic effect (GME), is controlled by the orbital magnetic moment of electrons, which has been proposed to be relevant to current-induced switching in twisted bilayer graphene. We show that the GME is not limited to bulk materials but also appears for quasi-2d systems with minimal structure incorporated in the third direction. Starting from multi-band Kubo formula, we derive a generic expression for GME current in quasi-2d materials induced by low-frequency light, and provide a Feynman-diagrammatic interpretation. The relations between the 2d finite layered formula and 3d bulk formula are also discussed.
