论文标题
双层石墨烯纳米替伯苯中边缘磁化的异常振荡和电气开关
Anomalous Bloch oscillation and electrical switching of edge magnetization in bilayer graphene nanoribbon
论文作者
论文摘要
石墨烯具有拓扑边缘频段，可根据边缘配置（锯齿形或胡须）连接一对狄拉克点的两端。由于其平坦的色散，可以自发的边缘磁性磁性引起的库仑相互作用引起了极大的兴趣。我们在这种边缘带上发现异常的Bloch振荡，其中平坦的色散沿田间方向冻结了电子运动，而频段通过散装的拓扑连接导致电子振荡，在侧层/层相对层/层的毛线丝带的不同构型之间的边缘之间的横向振荡。我们的Hubbard模型平均场计算表明，可以利用这种现象来用于边缘磁化构型的电开关。
Graphene features topological edge bands that connect the pair of Dirac points through either sectors of the 1D Brillouin zone depending on edge configurations (zigzag or bearded). Because of their flat dispersion, spontaneous edge magnetisation can arise from Coulomb interaction in graphene nanoribbons, which has caught remarkable interest. We find an anomalous Bloch oscillation in such edge bands, in which the flat dispersion freezes electron motion along the field direction, while the topological connection of the bands through the bulk leads to electron oscillation in the transverse direction between edges of different configurations on opposite sides/layers of a bilayer ribbon. Our Hubbard-model mean-field calculation shows that this phenomenon can be exploited for electrical switching of edge magnetisation configurations.
