Zhang Xiaoming, He Tingli, Liu Ying, Dai Xuefang, Liu Guodong, Chen Cong, Wu Weikang, Zhu Jiaojiao, Yang Shengyuan A
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China.
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Nano Lett. 2023 Aug 23;23(16):7358-7363. doi: 10.1021/acs.nanolett.3c01723. Epub 2023 Aug 3.
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 Co(HITP). Its ground state with in-plane ferromagnetic ordering hosts a nontrivial real Chern number, enabled by the 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 Mn(HITP) and Fe(HITP), which also exist. Possible experimental detections and implications of an emerging magnetic flat band in the system are discussed.
真正的陈绝缘体引起了极大的关注，但到目前为止，它们的材料实现仅限于无磁性晶体和没有自旋轨道耦合的系统。在这里，我们在最近合成的金属有机框架材料Co(HITP)中揭示了磁性真正陈绝缘体（MRCI）态。其具有面内铁磁有序的基态具有非平凡的实陈数，这是由对称性和对自旋轨道耦合的鲁棒性实现的。与之前的非磁性例子不同，MRCI的拓扑角零模是自旋极化的。此外，在小拉伸应变下，该材料通过一个赝自旋-1临界态从MRCI经历拓扑相变到磁性双外尔半金属相。在密切相关的材料Mn(HITP)和Fe(HITP)中也能发现类似的物理现象，它们也存在。讨论了该系统中新兴磁性平带的可能实验检测及其意义。
