Strain-tunable magnetism and nodal loops in monolayer MnB
Designing two-dimensional materials with magnetic and topological properties has continuously attracted intense interest in fundamental science and potential applications. Here, on the basis of first-principles calculations, we predict the coexistence of antiferromagnetism and Dirac nodal loops (NLs...
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Veröffentlicht in: | Applied physics letters 2020-09, Vol.117 (10) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Designing two-dimensional materials with magnetic and topological properties has continuously attracted intense interest in fundamental science and potential applications. Here, on the basis of first-principles calculations, we predict the coexistence of antiferromagnetism and Dirac nodal loops (NLs) in monolayer MnB, where the band crossing points are very close to the Fermi level. Remarkably, a moderate strain can induce an antiferromagnetic to ferromagnetic phase transition, driving monolayer MnB to a ferromagnetic metal with Weyl NLs. Such a type of topological quantum phase transition has not been observed before. In addition, the symmetry-protected properties of the two types of NLs as well as the magnetic critical temperatures are investigated. The controllable magnetic and topological order in monolayer MnB offers a unique platform for exploring topological quantum phase transitions and realizing nanospintronic devices. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/5.0021056 |