期刊
PHYSICAL REVIEW B
卷 92, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.201303
关键词
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资金
- National Natural Science Foundation of China [51371010]
- Fundamental Research Funds for the Central Universities
- NSF-PREM [DMR-1205734]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1205734] Funding Source: National Science Foundation
Using first-principles calculations, we predict a Chern insulating phase in thin films of the ferromagnetic semimetal GdN. In contrast to previously proposed Chern insulator candidates, which mostly rely on honeycomb lattices, this system affords a great chance to realize the quantum anomalous Hall effect on a square lattice without either a magnetic substrate or transition metal doping, making synthesis easier. The band inversion between the 5d orbitals of Gd and 2p orbitals of N is verified by first-principles calculations based on density functional theory, and the band gap can be as large as 100 meV within the GdN trilayer. With a further increase of film thickness, the band gap tends to close and the metallic bulk property becomes obvious.
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