论文标题
工程磁性拓扑绝缘子在欧盟$ _5M_2X_6 $ ZINTLS
Engineering magnetic topological insulators in Eu$_5M_2X_6$ Zintls
论文作者
论文摘要
磁性绝缘体为量子异常的霍尔物理和轴支电动力学提供了突出的材料平台。然而，缺乏材料实现，而宽大的表面却阻碍了这些异国情调量子现象的技术利用。在这里，使用ZINTL概念和非晶状体空间组的性质，我们在计算上进行了磁性拓扑拓扑制度。具体而言，我们探索欧盟$ _5M_2X_6 $（$ M $ =金属，$ x $ = pnictide）Zintl化合物，发现欧盟$ _5 $ _5 $ ga $ _2 $ _2 $ _6 $ _6 $，eu $ _5 $ _5 $ _5 $ _5 $ tl $ _2 $ _2 $ _6 $ _6 $ _5 $ _5美元$ \ mathbb {z} _2 $ indices。我们还表明，外延和单轴应变可用于控制$ \ mathbb {z} _2 $索引和散装能量差距。最后，我们讨论了朝着合成所提出的候选物的实验进展，并提供可用于寻找ZINTL化合物中强大的磁性绝缘体的见解。
Magnetic topological insulator provide a prominent material platform for quantum anomalous Hall physics and axion electrodynamics. However, the lack of material realizations with cleanly gapped surfaces hinders technological utilization of these exotic quantum phenomena. Here, using the Zintl concept and the properties of non-symmorphic space groups, we computationally engineer magnetic topological insulators. Specifically, we explore Eu$_5M_2X_6$ ($M$=metal, $X$=pnictide) Zintl compounds and find that Eu$_5$Ga$_2$Sb$_6$, Eu$_5$Tl$_2$Sb$_6$ and Eu$_5$In$_2$Bi$_6$ form stable structures with non-trivial $\mathbb{Z}_2$ indices. We also show that epitaxial and uniaxial strain can be used to control the $\mathbb{Z}_2$ index and the bulk energy gap. Finally, we discuss experimental progress towards the synthesis of the proposed candidates and provide insights that can be used in the search for robust magnetic topological insulators in Zintl compounds.
