论文标题
扭曲的双层石墨烯中极化控制的瑞利散射中的干扰效应
Interference effects in polarization controlled Rayleigh scattering in twisted bilayer graphene
论文作者
论文摘要
我们根据Bistritzer和MacDonald开发的Continuum Electronic Band模型计算\ TCO {极化} - 控制双层石墨烯（TBLG）的雷利散射响应，同时考虑了其精炼，以解决其结构裂料的效果，掺杂了掺杂，掺杂型Hartree Hartree相互作用和粒子词和粒子词和粒子词的影响。与单层石墨烯（SLG）和AB堆叠的双层石墨烯（AB-BLG）形成鲜明对比的是，瑞利散射过程的主要波载体来自MoiréBrillouin区域（MBZ）的各个区域，在该区域中，主要贡献始终源于$ \ bm {k} $ {k} $ point $ \ bm {k} $ point $ \ bm {k} $ point y lasical lasies and flow yaster and flow the。与SLG相比，对于小扭曲角度（\ emph {e.g。}，以扭曲角$θ= 1.2^{\ circ} $，激光器的集成雷利强度$ e_l = 2〜 \ si {\ si Electronvolt} $ 100 $ 100 $ \ \ tco {polarization}）。对于交叉\ tco {极化}的情况，它表现出明显复杂的\ tco {行为}暗示了由光学矩阵元素介导的强干扰效应。我们发现，在小扭曲角度，\ emph {e.g。}，$θ= 1.05^{\ circ} $，波纹效应强烈增强了比率$ \ bm {r} _a = \ frac {\ frac {\ frac {\ frac {\ frac {\ text {intectated rayleigh interigated {intempationed {parlallate {pallallity for paralled \ tco {polarlention for textigr for textigr}}} {\ pallentife { cross- \ tco {polarization}}}} $ by $ \ sim $ 1300 $ times \ emph {viz a viz} slg或ab-blg。
We calculate the \tco{polarization}-controlled Rayleigh scattering response of twisted bilayer graphene (tBLG) based on the continuum electronic band model developed by Bistritzer and MacDonald while considering its refinements which address the effects of structural corrugation, doping-dependent Hartree interactions and particle-hole asymmetry. The dominant wave vectors for the Rayleigh scattering process emanate from various regions of the Moiré Brillouin zone (MBZ) in contrast to single-layer graphene (SLG) and AB-stacked bilayer graphene (AB-BLG), where the dominant contributions always stem from the vicinity of the $\bm{K}$ point for optical laser energies and below. Compared to SLG, the integrated Rayleigh intensity is strongly enhanced for small twist angles (\emph{e.g.}, at a twist angle $ θ= 1.2^{\circ} $, the integrated Rayleigh intensity at laser energy $ E_l=2~\si{\electronvolt} $ enhances by a factor of $\sim $ 100 for the case of parallel \tco{polarization}). While for the case of cross-\tco{polarization}, it exhibits a markedly complex \tco{behavior} suggestive of strong interference effects mediated by the optical matrix elements. We find that at small twist angles, \emph{e.g.}, $ θ= 1.05^{\circ} $, the corrugation effects strongly enhances the ratio $ \bm{R}_A = \frac{ \text{integrated Rayleigh intensity for parallel \tco{polarization}}}{\text{integrated Rayleigh intensity for cross-\tco{polarization}}} $ by $ \sim $ $ 1300 $ times \emph{viz a viz} SLG or AB-BLG.
