论文标题
观察bismuth表面中Yamaji魔法角度的观察
Observation of Yamaji magic angles in bismuth surfaces
论文作者
论文摘要
二维双层由二维拓扑绝缘子组成，相应地，表面是边缘状态的阵列。此外，拓扑模型（包括二阶拓扑秩序）预测了铰链状态介导的层间电耦合。 Here we report that angle dependent magnetoresistance measurements of small diameter single-crystal bismuth nanowires exhibit the sequence of magnetoresistance (MR) peaks at Yamaji magic angles and a peak for B//bilayer, indicating coherent transport between layers, and showing that the Fermi surface of surface electrons is a warped cylinder. MR峰与磁场诱导的平坦带有关，这些平面带让人联想到双层石墨烯中众所周知的平坦带。拓扑铰链状态在运输期间解释了跨层的连贯运输。
Bismuth consist of bismuth bilayers that are two-dimensional topological insulators and correspondingly, the surface is an array of edge states. Moreover, topological models, including second order topologic order, predict an interlayer electrical coupling mediated by hinge states. Here we report that angle dependent magnetoresistance measurements of small diameter single-crystal bismuth nanowires exhibit the sequence of magnetoresistance (MR) peaks at Yamaji magic angles and a peak for B//bilayer, indicating coherent transport between layers, and showing that the Fermi surface of surface electrons is a warped cylinder. The MR peaks are associated with magnetic field induced flat bands that are reminiscent of the well-known flat bands in bilayer graphene. Coherent transport across layers is interpreted in term of transport by topological hinge states.
