论文标题
移动的准中心电荷密度波中的新兴边缘模式
Emergent Edge Modes in Shifted Quasi-One-Dimensional Charge Density Waves
论文作者
论文摘要
我们提出并研究了移动电荷密度波（CDW）的二维（2D）相，该相是由一系列弱耦合的1D CDW电线构建的，其相位从一根电线转移到另一座电线。我们表明，完全损失的大量CDW具有拓扑特性，其特征是非零的Chern数，这意味着散装间隙内的边缘模式。值得注意的是，这些边缘模式表现出光谱伪流的函数，沿边缘\ emph {位置}的函数，因此在\ emph {Momentum}空间中以其光谱流动到Chern绝缘子的手性边缘模式。此外，我们表明CDW边缘模式在与线际耦合相对的情况下是稳定的。我们的预测可以在准1D CDW化合物中进行实验测试，例如ta $ _2 $ se $ _8 $ i。
We propose and study a two-dimensional (2D) phase of shifted charge density waves (CDW), which is constructed from an array of weakly coupled 1D CDW wires whose phases shift from one wire to the next. We show that the fully gapped bulk CDW has topological properties, characterized by a nonzero Chern number, that imply edge modes within the bulk gap. Remarkably, these edge modes exhibit spectral pseudo-flow as a function of \emph{position} along the edge, and are thus dual to the chiral edge modes of Chern insulators with their spectral flow in \emph{momentum} space. Furthermore, we show that the CDW edge modes are stable against inter-wire coupling. Our predictions can be tested experimentally in quasi-1D CDW compounds such as Ta$_2$Se$_8$I.
