论文标题
Chern隔离式双层石墨烯的域墙竞争
Domain wall competition in the Chern insulating regime of twisted bilayer graphene
论文作者
论文摘要
我们考虑填充$ν=+3 $时，我们考虑了魔法角扭曲的双层石墨烯（TBG），其中实验观察到了强大的量化异常霍尔效应。这归因于山谷和自旋偏振的切恩绝缘基态的形成，该基态会自发打破时间转换对称性，并通过六角形硝化硼（HBN）底物稳定。我们确定了三种不同类型的域壁，并通过理论论证和Hartree-fock计算来研究其特性和能量选择机制，该计算适用于处理不均匀的Moiré系统。我们评论这些结果对运输和扫描探测实验的含义。
We consider magic-angle twisted bilayer graphene (TBG) at filling $ν=+3$, where experiments have observed a robust quantized anomalous Hall effect. This has been attributed to the formation of a valley- and spin-polarized Chern insulating ground state that spontaneously breaks time-reversal symmetry, and is stabilized by a hexagonal boron nitride (hBN) substrate. We identify three different types of domain wall, and study their properties and energetic selection mechanisms via theoretical arguments and Hartree-Fock calculations adapted to deal with inhomogeneous moiré systems. We comment on the implications of these results for transport and scanning probe experiments.
