论文标题
磁化拓扑绝缘子多层
Magnetized Topological Insulator Multilayers
论文作者
论文摘要
我们讨论通过堆叠固有的磁化拓扑绝缘子（例如Mn（sb $ _ {x} $ _ {x} $ $ $ $ _ {1-x x} $ _ 2 $ _ 2 $ x $ x $ _ 4 $ te $ te $ _2 $ _2）绝缘子五重奏层按任意顺序进行。我们的分析利用了一个简化的模型，该模型仅保留在每个隔隔层或五重奏层的两个表面上的狄拉克锥自由度。我们通过与{\ it ab intio}密度功能理论（DFT）计算进行比较来证明该模型的适用性并估算其参数。然后，我们采用耦合的狄拉克锥模型来解释薄膜特性的依赖性，尤其是量子异常霍尔效应的存在或不存在，对膜厚度，磁性构型和堆叠布置以及对Weyl Superlattices的设计进行评论。
We discuss the magnetic and topological properties of bulk crystals and quasi-two-dimensional thin films formed by stacking intrinsic magnetized topological insulator ( for example Mn(Sb$_{x}$Bi$_{1-x}$)$_2$X$_4$ with X = Se,Te, including MnBi$_2$Te$_4$) septuple layers and topological insulator quintuple layers in arbitrary order. Our analysis makes use of a simplified model that retains only Dirac-cone degrees of freedom on both surfaces of each septuple or quintuple layer. We demonstrate the model's applicability and estimate its parameters by comparing with {\it ab initio } density-functional-theory(DFT) calculations. We then employ the coupled Dirac cone model to provide an explanation for the dependence of thin-film properties, particularly the presence or absence of the quantum anomalous Hall effect, on film thickness, magnetic configuration, and stacking arrangement, and to comment on the design of Weyl superlattices.
