论文标题
强烈各向异性交换相互作用引起的拓扑边缘传导
Topological Edge Conduction Induced by Strong Anisotropic Exchange Interactions
论文作者
论文摘要
我们预测，当各向异性相互作用至少是各向同性相互作用的强度的两倍时，蜂窝晶格结构中各向同性和各向异性交换之间的相互作用可能会导致拓扑边缘传导。对于Na $ _2 $ IRO $ _3 $之类的材料，这种强烈的各向异性交换交互同时引起了一种锯齿形类型的反铁磁秩序，它破坏了拓扑边缘导体的时间反向对称性。我们表明，当费米能量位于特定能量范围内时，此类拓扑导体中的电子传输将表现出量化的霍尔电导，而无需任何外部磁场。
We predict that an interplay between isotropic and anisotropic exchange interactions in a honeycomb lattice structure can lead to topological edge conduction when the anisotropic interaction is at least twice the strength of the isotropic interaction. For materials like Na$_2$IrO$_3$, such a strong anisotropic exchange interaction simultaneously induces a zigzag type of antiferromagnetic order that breaks the time-reversal symmetry of the topological edge conductor. We show that the electronic transport in such topological conductors will exhibit a quantized Hall conductance without any external magnetic field when the Fermi energy lies within a particular energy range.
