由d波亚晶格交错交变磁性诱导的具有可调陈数的量子反常霍尔效应
Quantum anomalous Hall effect with tunable Chern numbers induced by d-wave sublattice-staggered altermagnetism
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中文总结 AI 辅助
研究通过构建含自旋紧束缚模型，利用d波亚晶格交错交变磁性驱动量子反常霍尔效应，实现可调陈数，确定相图，识别能带反转，展示手性边缘态和电导平台，为补偿磁体实现该效应提供简单途径。
中文摘要 AI 辅助
我们在正方形晶格上构建了一个最小的含自旋紧束缚模型，其中d波亚晶格交错交变磁性驱动量子反常霍尔效应。交换场在两个亚晶格之间交错，在由泡利矩阵τ_z描述的A和B上取相反符号。所得绝缘相具有可调陈数C = ±1和C = ±2，由交错交换强度和亚晶格交错势控制。我们确定了完整的相图，识别了布里渊区X和Y点处的谷分辨能带反转，并展示了手性边缘态和量子化的两端电导平台。我们的工作提供了一条通过d波亚晶格交错交变磁性在补偿磁体中实现量子反常霍尔效应的简单途径。
英文摘要
We construct a minimal spinful tight-binding model on a square lattice, where a $d$-wave sublattice-staggered altermagnetism drives the quantum anomalous Hall effect. Here the exchange field is staggered between the two sublattices, where it takes opposite signs on $A$ and $B$ described by the Pauli matrix $τ_z$. The resulting insulating phases host tunable Chern numbers $\mathcal{C}=\pm1$ and $\mathcal{C}=\pm2$, controlled by the staggered exchange strength and the sublattice-staggered potential. We determine the complete phase diagram, identify valley-resolved band inversions at the $X$ and $Y$ points in the Brillouin zone, and demonstrate chiral edge states together with quantized two-terminal conductance plateaus. Our work provides a simple route to realizing the quantum anomalous Hall effect in compensated magnets via a $d$-wave sublattice-staggered altermagnetism.
