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Symmetry, Maximally Localized Wannier States, and a Low-Energy Model for Twisted Bilayer Graphene Narrow Bands

机译:对称性,最大局部化的梵语状态,以及扭曲双层石墨烯窄带的低能量模型

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We build symmetry-adapted maximally localized Wannier states and construct the low-energy tight-binding model for the four narrow bands of twisted bilayer graphene. We do so when the twist angle is commensurate near the “magic” value and the narrow bands are separated from the rest of the bands by energy gaps. On each layer and sublattice, every Wannier state has three peaks near the triangular moiré lattice sites. However, each Wannier state is localized and centered around a site of the honeycomb lattice that is dual to the triangular moiré lattice. The space group and the time-reversal symmetries are realized locally. The corresponding tight-binding model provides a starting point for studying the correlated many-body phases.
机译:我们构建对称性适应的最大局部的若明威策略,并为扭曲双层石墨烯的四个窄带构建低能量紧密粘合模型。我们这样做,当扭曲角度在“魔法”值附近相称时,窄带通过能量间隙与其余条带分开。在每层和子分离术上,每个Wannier状态都有三个峰,在三角形莫尔格子网站附近。然而,每个翼型状态都是局部的,并以蜂窝格子的部位为中心,这是双向三角形莫尔格子的。空间组和时间逆转对称在本地实现。相应的紧密结合模型提供了研究相关的多体阶段的起点。

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