Magnetism-mediated transition between crystalline and higher-order topological phases in NpSb
Mao N, Hu X, Wang H, Dai Y, Huang B, Mokrousov Y, Niu C (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 103
Article Number: 195152
Journal Issue: 19
DOI: 10.1103/PhysRevB.103.195152
Abstract
Merging the fields of topology and magnetism expands the scope of fundamental quantum phenomena with novel functionalities for topological spintronics enormously. Here, we theoretically demonstrate that ferromagnetism provides an efficient means to achieve a topological switching between crystalline and higher-order topological insulator phases in two dimensions. Using a tight-binding model and first-principles calculations, we identify layered NpSb as a long-awaited two-dimensional topological crystalline insulator with intrinsic ferromagnetic order with a band gap which is as large as 220 meV. We show that when Mz symmetry is preserved for the out of plane magnetization of this material, it exhibits a pair of gapless edge states along all boundaries and carries a nonzero mirror Chern number CM=1. Remarkably, when rotating the magnetization into the plane a higher-order topological insulator phase with a parity-based invariant ν2D=1 is achieved, and in-gap topological corner states emerge. Our results pave the way to understanding and engineering topological insulating states in two-dimensional ferromagnets.
Involved external institutions
Shandong-University (SDU)
China (CN)
Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Germany (DE)
China (CN)
Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Germany (DE)
How to cite
APA:
Mao, N., Hu, X., Wang, H., Dai, Y., Huang, B., Mokrousov, Y., & Niu, C. (2021). Magnetism-mediated transition between crystalline and higher-order topological phases in NpSb. Physical Review B, 103(19). https://doi.org/10.1103/PhysRevB.103.195152
MLA:
Mao, Ning, et al. "Magnetism-mediated transition between crystalline and higher-order topological phases in NpSb." Physical Review B 103.19 (2021).
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