Zintl Sr $_2X$化合物（$X$ =Pb，Sn）中非平凡拓扑绝缘态的应变驱动起始
Strain driven onset of non-trivial topological insulating states in Zintl Sr$_2X$ compounds ($X$=Pb, Sn)
摘要：
我们利用标准和混合密度泛函理论研究了碱土金属基化合物Sr $_2$ Pb和Sr $_2$ Sn的二元Zintl相的拓扑行为。结果发现，Sr $_2$ Pb位于拓扑不稳定性的边缘，可以通过施加小的单轴膨胀应变（$>$ 3%）进行适当的调整。在Sr $_{2}$ Pb（010）表面上，非平凡的拓扑绝缘态显示出明确的金属态，并研究了其随膜厚的变化.
英文摘要：
We explore the topological behavior of the binary Zintl phase of the alkaline earth metals based compounds Sr$_2$Pb and Sr$_2$Sn using both standard and hybrid density functional theory. It is found that Sr$_2$Pb lies on the verge of a topological instability which can be suitably tuned through the application of a small uniaxial expansion strain ($>$ 3%). The resulting non-trivial topologically insulating state display well-defined metallic states in the Sr$_{2}$Pb(010) surface, whose evolution is studied as a function of the film thickness.
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