Magnetic Real Chern Insulator in 2D Metal–Organic Frameworks

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2023-08-03 DOI:10.1021/acs.nanolett.3c01723

Xiaoming Zhang*, Tingli He, Ying Liu, Xuefang Dai, Guodong Liu*, Cong Chen, Weikang Wu, Jiaojiao Zhu and Shengyuan A. Yang,

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引用次数: 3

Abstract

Real Chern insulators have attracted great interest, but so far, their material realization is limited to nonmagnetic crystals and systems without spin–orbit coupling. Here, we reveal the magnetic real Chern insulator (MRCI) state in a recently synthesized metal–organic framework material Co₃(HITP)₂. Its ground state with in-plane ferromagnetic ordering hosts a nontrivial real Chern number, enabled by the C_2zT symmetry and robustness against spin–orbit coupling. Distinct from previous nonmagnetic examples, the topological corner zero modes of MRCIs are spin-polarized. Furthermore, under small tensile strains, the material undergoes a topological phase transition from the MRCI to a magnetic double-Weyl semimetal phase, via a pseudospin-1 critical state. Similar physics can also be found in closely related materials Mn₃(HITP)₂ and Fe₃(HITP)₂, which also exist. Possible experimental detections and implications of an emerging magnetic flat band in the system are discussed.

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二维金属-有机骨架中的磁性实陈绝缘子

真正的陈氏绝缘体引起了人们的极大兴趣，但到目前为止，它们的材料实现仅限于非磁性晶体和没有自旋轨道耦合的系统。在这里，我们揭示了最近合成的金属-有机骨架材料Co3(HITP)2中的磁性实陈氏绝缘体(MRCI)状态。由于C2zT对称性和抗自旋轨道耦合的鲁棒性，具有平面内铁磁有序的基态具有非平凡实陈恩数。与以前的非磁性例子不同，核磁共振成像的拓扑角零模式是自旋极化的。此外，在小的拉伸应变下，材料经历了从MRCI到磁性双weyl半金属相的拓扑相变，通过赝自旋-1临界态。类似的物理现象也可以在密切相关的材料Mn3(HITP)2和Fe3(HITP)2中发现，它们也存在。讨论了系统中出现的磁平带的可能的实验检测和意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

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