Magnetic Real Chern Insulator in 2D Metal-Organic Frameworks.
basic_science · Level V
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- Record sourced from PubMed, PMID 37535707.
- Also identified by DOI 10.1021/acs.nanolett.3c01723.
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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 Co<sub>3</sub>(HITP)<sub>2</sub>. Its ground state with in-plane ferromagnetic ordering hosts a nontrivial real Chern number, enabled by the <i>C</i><sub>2<i>z</i></sub><i>T</i> 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<sub>3</sub>(HITP)<sub>2</sub> and Fe<sub>3</sub>(HITP)<sub>2</sub>, which also exist. Possible experimental detections and implications of an emerging magnetic flat band in the system are discussed.