论文标题
扭曲的双层石墨烯中不可固定的诱导的窄带群
Incommensurability-induced sub-ballistic narrow-band-states in twisted bilayer graphene
论文作者
论文摘要
我们通过数值精确的均值研究了电子中电子的定位特性，用于小角度的小角度。在魔法角度周围的狭窄带区域内发现了次球态。这种状态在动量空间中被定位，并遵循非波斯顿水平的统计数据，与他们发现的弹道对应物相比，这些状态是紧密相称的角度。运输结果证实了这张图：对于足够大的系统，电导随系统尺寸而降低，以在次焊态内进行不相差的角度。我们的结果表明，在窄带制度中，不可通信的效果至关重要。因此，必须考虑到魔术角扭曲的双层石墨烯的准确描述，必须考虑一般扭曲角的不稳定性。
We study the localization properties of electrons in incommensurate twisted bilayer graphene for small angles, encompassing the narrow-band regime, by numerically exact means. Sub-ballistic states are found within the narrow-band region around the magic angle. Such states are delocalized in momentum-space and follow non-Poissonian level statistics, in contrast with their ballistic counterparts found for close commensurate angles. Transport results corroborate this picture: for large enough systems, the conductance decreases with system size for incommensurate angles within the sub-ballistic regime. Our results show that incommensurability effects are of crucial importance in the narrow-band regime. The incommensurate nature of a general twist angle must therefore be taken into account for an accurate description of magic-angle twisted bilayer graphene.
