云纹
扭转
石墨烯
凝聚态物理
零点能量
Dirac(视频压缩格式)
电子能带结构
魔法角
物理
光学
几何学
量子力学
数学
谱线
中微子
作者
Rafi Bistritzer,A. H. MacDonald
标识
DOI:10.1073/pnas.1108174108
摘要
A moiré pattern is formed when two copies of a periodic pattern are overlaid with a relative twist. We address the electronic structure of a twisted two-layer graphene system, showing that in its continuum Dirac model the moiré pattern periodicity leads to moiré Bloch bands. The two layers become more strongly coupled and the Dirac velocity crosses zero several times as the twist angle is reduced. For a discrete set of magic angles the velocity vanishes, the lowest moiré band flattens, and the Dirac-point density-of-states and the counterflow conductivity are strongly enhanced.
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