Near a magic twist angle, bilayer graphene transforms from a weakly correlated Fermi liquid to a strongly correlated two-dimensional electron system with properties that are extraordinarily sensitive to carrier density and to controllable environmental factors such as the proximity of nearby gates and twist-angle variation. Among other phenomena, magic-angle twisted bilayer graphene hosts superconductivity, interaction-induced insulating states, magnetism, electronic nematicity, linear-in-temperature low-temperature resistivity and quantized anomalous Hall states. We highlight some key research results in this field, point to important questions that remain open and comment on the place of magic-angle twisted bilayer graphene in the strongly correlated quantum matter world.

在接近魔术扭曲角的情况下，双层石墨烯从弱相关的费米液体转变为高度相关的二维电子系统，其性质对载流子密度和可控环境因素（如附近栅极的接近程度和扭曲角度变化）极其敏感。除其他现象外，魔角扭曲的双层石墨烯还具有超导性，相互作用诱导的绝缘态，磁性，电子向列性，温度线性低温电阻率和量化的异常霍尔态。我们重点介绍了该领域的一些关键研究成果，指出了仍悬而未决的重要问题，并评论了在强相关量子物质世界中魔角扭曲双层石墨烯的位置。