Journal
RSC ADVANCES
Volume 5, Issue 13, Pages 9875-9880Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra15861j
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Funding
- National Basic Research Program of China [2012CB932302]
- National Natural Science Foundation of China [91221101, 21433006]
- 111 project [B13209]
- Taishan Scholar Program of Shandong
- National Super Computing Centre in Jinan
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A quantum anomalous Hall effect (QAHE) has been realized in the Cr-doped magnetic topological insulator at an extremely low temperature (similar to 30 mK). From first-principles, we predict that QAHE can also be achieved in a well-designed graphene nanomesh without the requirement of transition metal doping. The ferromagnetic ordering arises mainly from the in-plane p(xy) orbitals, leading to a Curie temperature of 830 K. The bulk band gap due to the intrinsic spin-orbital coupling (SOC) of the p(xy) orbitals is about 3.7 meV, corresponding to an operating temperature of 43 K. This work reveals a viable approach for realizing QAHE in metal-free graphene nanostructures.
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