标题： Rashba诱导的赝自旋-1晶格中的谷极化量子反常霍尔和拓扑金属相 显示英文标题

标题： Valley-polarized Quantum Anomalous Hall and Topological Metal Phase in Rashba induced pseudospin-1 lattice

摘要： 我们研究了在交错电场和磁化的影响下，Rashba自旋轨道耦合和交换耦合引起的伪自旋-$1$系统Dice晶格的拓扑性质。 该系统的能带结构和拓扑相被研究并与伪自旋-$\frac{1}{2}$系统的蜂窝晶格进行了比较。 在交错电场和磁化单独影响下，系统经历了一个明显的相变：(i) 交错电势使系统从量子反常霍尔$(C_n = 2)$转变为与边缘模式中手性翻转相关的谷极化量子反常霍尔相$(C_n = -1)$；而 (ii) 交错磁化则使系统转变为与非常规反手性边缘带相关的拓扑金属，从拓扑绝缘体转变而来。 这些结果通过陈数、霍尔电导率、锯齿形和扶手椅形边缘态的计算得到了进一步支持。 我们的发现增强了对二维伪自旋-1系统中新拓扑相的理解，并为探索反手性边缘态开辟了一个新平台。 显示英文摘要

摘要： We study the topological properties of Rashba spin-orbit coupling and exchange coupling induced pseudospin-$1$ system Dice lattice under the influence of a staggered electric potential and magnetization. The band structure and topological phases of the system are investigated and compared with pseudospin-$\frac{1}{2}$ system honeycomb lattice. Under individual influence of the staggered electric field and magnetization, the system undergoes a distinct phase transition: (i) a staggered electric potential drives the system from a quantum anomalous Hall $(C_n = 2)$ to a valley polarized quantum anomalous Hall phase $(C_n = -1)$ associated with edge modes with a flip in the chirality; while (ii) a staggered magnetization changes the system to a topological metal associated with unconventional antichiral edge bands, from a topological insulator. These results are further supported by calculations of the Chern numbers, Hall conductance, zigzag, and armchair edge states. Our findings enhance the understanding of new topological phases in the 2D pseudospin-1 system and open up a new platform to explore the anti-chiral edge states.