论文标题
磁轴绝缘子中表面异常大厅效应的光谱特征
Spectral signatures of the surface anomalous Hall effect in magnetic axion insulators
论文作者
论文摘要
磁性拓扑系统的拓扑表面状态，例如Weyl半含量和轴突绝缘子，与非常规的运输特性（例如非零或半量化的表面异常霍尔效应）有关。在这里，我们使用模型汉密尔顿和第一原理计算研究表面异常霍尔效应及其在不同磁性拓扑阶段的光谱特征。我们证明，通过调整磁化和层间电子跳跃，可以建立富三维拓扑相图，包括三种由Weyl Semimetals桥接的拓扑上不同的绝缘阶段，可以直接映射到逼真的材料，例如MNBI2TE4/（BI2TE3）N系统。其中，我们发现，根据磁同质性，轴突压形器相的表面异常霍尔电导率是在E2/2H附近饱和或在E2/2H附近振荡的量良好的量。我们还讨论了嵌入在侧面带内的手性铰链模式，作为传输测量的潜在实验特征。我们的研究是迈向直接实现现实材料系统中长期轴承绝缘子的重要一步。
The topological surface states of magnetic topological systems, such as Weyl semimetals and axion insulators, are associated with unconventional transport properties such as nonzero or half-quantized surface anomalous Hall effect. Here we study the surface anomalous Hall effect and its spectral signatures in different magnetic topological phases using both model Hamiltonian and first-principles calculations. We demonstrate that by tailoring the magnetization and interlayer electron hopping, a rich three-dimensional topological phase diagram can be established, including three types of topologically distinct insulating phases bridged by Weyl semimetals, and can be directly mapped to realistic materials such as MnBi2Te4/(Bi2Te3)n systems. Among them, we find that the surface anomalous Hall conductivity in the axion-insulator phase is a well-localized quantity either saturated at or oscillating around e2/2h, depending on the magnetic homogeneity. We also discuss the resultant chiral hinge modes embedded inside the side surface bands as the potential experimental signatures for transport measurements. Our study is a significant step forward towards the direct realization of long-sought axion insulators in realistic material systems.
