Natural van der Waals heterostructural single crystals with both magnetic and topological properties
Natural van der Waals heterostructural single crystals with both magnetic and topological properties
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DOI：
10.1126/sciadv.aax9989
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发表时间：
2019-05
期刊：
影响因子：
13.6
通讯作者：
Jiazhen Wu;Fucai Liu;M. Sasase;K. Ienaga;Y. Obata;R. Yukawa;K. Horiba;H. Kumigashira;S. Okuma-S.-Ok
中科院分区：
文献类型：
--
作者：
Jiazhen Wu;Fucai Liu;M. Sasase;K. Ienaga;Y. Obata;R. Yukawa;K. Horiba;H. Kumigashira;S. Okuma-S.-Ok
我们报告自然发生的货车德瓦耳斯异质结构的单晶具有内在的磁性拓扑性质。同时具有磁性和拓扑结构的异质结构是实现奇异拓扑量子态的理想材料，但在合成和工程上具有挑战性。在这里，我们报告的自然磁性货车德瓦耳斯异质结构的（MnBi 2 Te 4）m（Bi 2 Te 3）n，表现出可控的磁性，同时保持其拓扑表面状态。随着磁性层间距的增加，层间反铁磁交换耦合逐渐减弱，在低于5K时观察到与磁化强度耦合良好的反常霍尔效应，表现出铁磁磁滞现象。所获得的均匀异质结具有原子级的尖锐界面和内禀磁性，将为研究量子反常霍尔效应、轴子绝缘体态和拓扑磁电效应提供理想的平台。
We report naturally occurring van der Waals heterostructural single crystals with intrinsic magnetic topological properties. Heterostructures having both magnetism and topology are promising materials for the realization of exotic topological quantum states while challenging in synthesis and engineering. Here, we report natural magnetic van der Waals heterostructures of (MnBi2Te4)m(Bi2Te3)n that exhibit controllable magnetic properties while maintaining their topological surface states. The interlayer antiferromagnetic exchange coupling is gradually weakened as the separation of magnetic layers increases, and an anomalous Hall effect that is well coupled with magnetization and shows ferromagnetic hysteresis was observed below 5 K. The obtained homogeneous heterostructure with atomically sharp interface and intrinsic magnetic properties will be an ideal platform for studying the quantum anomalous Hall effect, axion insulator states, and the topological magnetoelectric effect.