论文标题
xybi2te5中的内在且可调的量子异常霍尔效应和磁性拓扑阶段
Intrinsic and tunable quantum anomalous Hall effect and magnetic topological phases in XYBi2Te5
论文作者
论文摘要
通过第一原理计算，我们研究了xybi2te5-fomily（x，y = mn，ni，v，eu）化合物的磁性和拓扑特性。强耦合的双磁原子层可以显着提高磁有序温度，同时保持拓扑上的非平凡性能。特别是，Nivbi2Te5被发现是散装中的磁性Weyl半含量，在薄膜中具有Curie温度（〜150 K）的薄膜中的Chern绝缘子，并且全间隙均高于77 K. Ni2bi2te5，Mnnibi2te5，Mnnibi2te5，NIVBI2TE5，NIVBI2TE5和NIEUBI2TE5和NIEUBI2TE5均表现出内在的动力轴承式替代性轴突状态。其中，MNNIBI2TE5的尿素温度超过200 K，Ni2bi2te5甚至显示出在室温高于室温的抗铁磁序列。这些结果表明一种方法是实现高温量子异常霍尔效应和其他拓扑量子效应。
By first-principles calculations, we study the magnetic and topological properties of XYBi2Te5-family (X, Y = Mn, Ni, V, Eu) compounds. The strongly coupled double magnetic atom-layers can significantly enhance the magnetic ordering temperature while keeping the topologically nontrivial properties. Particularly, NiVBi2Te5 is found to be a magnetic Weyl semimetal in bulk and a Chern insulator in thin film with both the Curie temperature (~150 K) and full gap well above 77 K. Ni2Bi2Te5, MnNiBi2Te5, NiVBi2Te5 and NiEuBi2Te5 exhibits intrinsic dynamic axion state. Among them, MnNiBi2Te5 has a Neel temperature over 200 K and Ni2Bi2Te5 even demonstrates antiferromagnetic order above room temperature. These results indicate an approach to realize high temperature quantum anomalous Hall effect and other topological quantum effects for practical applications.
