Experimentally feasible CrBr3 monolayer: Electronic and magnonic topological states correlated with rotation symmetry
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PUBLIC SUMMARY
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The nontrivial fermions and bosons emerge in the 2D CrBr3 and TiBr3 monolayer.
The second-order topological insulator is characterized by w2=1 and the nontrivial corner states.
The topological magnon insulator demonstrates the magnon edge state and thermal Hall effect.
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ABSTRACT
Topological magnets have been the focus of recent interest with both the nontrivial fermions and bosons extensively explored. However, their emergence within one realistic material remains largely unexplored. Here, we demonstrate the emergence of electronic and magnonic topological states, i.e., second-order topological insulator (SOTI) and topological magnon insulator (TMI), in the experimentally feasible 2D CrBr3 monolayer. For which the electronic SOTI is characterized by the second Stiefel-Whitney number w2=1 and the emergence of well-localized corner states arising from the rotation symmetry C3. Moreover, to achieve the TMI phase, we show that C3 serves as a key factor for obtaining the nonzero next-nearest-neighbor Dzyaloshinskii-Moriya interaction that is essential to open the magnon band gap and induce the nontrivial magnon band topology. The calculated Chern number for TMI is C=1, and one chiral magnon edge state is indeed obtained. These explored phenomena and insights not only considerably bridge the topological aspect of fermions and bosons but also enable innovative applications in topotronics devices. -
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REFERENCES
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Zou X., Bai Y., Dai Y., et al. (2025). Experimentally feasible CrBr3 monolayer: Electronic and magnonic topological states correlated with rotation symmetry. The Innovation Materials 3:100109. https://doi.org/10.59717/j.xinn-mater.2024.100109
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Zou X., Bai Y., Dai Y., et al. (2025). Experimentally feasible CrBr3 monolayer: Electronic and magnonic topological states correlated with rotation symmetry. The Innovation Materials 3:100109. https://doi.org/10.59717/j.xinn-mater.2024.100109
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Figure 1.
Crystalline structure of CrBr3 monolayer
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Figure 2.
The electronic properties of CrBr3 monolayer
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Figure 3.
The magnonic properties of CrBr3 monolayer
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Figure 4.
The electronic and magnonic properties of TiBr3 monolayer
