The interplay between band topology and magnetic order could generate a variety of time-reversal-breaking gapped topological phases with exotic topological quantization phenomena, such as quantum anomalous Hall (QAH) insulators and axion insulators (AxI). Here by combining analytic models and first-principles calculations, we find extremely rich magnetic topological quantum states in a van der Waals layered material ${\mathrm{Mn}}_2{\mathrm{Bi}}_2{\mathrm{Te}}_5$, including a dynamic axion field in the antiferromagnetic bulk, an ideal magnetic Weyl semimetal with a single pair of Weyl points, as well as QAH and AxI phases in thin films. The phase transition between QAH and AxI is tuned by the layer magnetization, which would provide a promising platform for chiral superconducting phases and Majorana fermion. We further present a simple and unified continuum model that captures the magnetic topological features, and is generic for ${\mathrm{Mn}}_2{\mathrm{Bi}}_2{\mathrm{Te}}_5$ and ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$ family materials.

中文翻译：

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层磁化强度调节Mn2Bi2Te5的本征拓扑相

带状拓扑与磁阶之间的相互作用可能会产生各种具有特殊拓扑量化现象的时空逆转的缺口拓扑相，例如量子异常霍尔（QAH）绝缘体和轴突绝缘体（AxI）。在这里，通过结合解析模型和第一性原理计算，我们发现了范德华层状材料中极其丰富的磁拓扑量子态${锰}_2{双}_2{特}_5$包括反铁磁体中的动态轴磁场，具有一对Weyl点的理想磁性Weyl半金属以及薄膜中的QAH和AxI相。QAH和AxI之间的相变通过层磁化来调节，这将为手性超导相和马里亚纳费米子提供有希望的平台。我们进一步提出了一个简单统一的连续谱模型，该模型捕获了磁拓扑特征，并且对于${锰}_2{双}_2{特}_5$ 和 ${\mathrm{锰铋}}_2{特}_4$ 家庭材料。