| Autor: |
Qi, Shifei, Gao, Ruiling, Chang, Maozhi, Hou, Tao, Han, Yulei, Qiao, Zhenhua |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 102, 085419 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.102.085419 |
| Popis: |
Quantum anomalous Hall effect (QAHE) has been experimentally observed in magnetically doped topological insulators. However, ultra-low temperature (usually below 300 mK), which is mainly attributed to inhomogeneous magnetic doping, becomes a daunting challenge for potential applications. Here, a \textit{nonmagnetic}-doping strategy is proposed to produce ferromagnetism and realize QAHE in topological insulators. We numerically demonstrated that magnetic moments can be induced by nitrogen or carbon substitution in Bi$_2$Se$_3$, Bi$_2$Te$_3$, and Sb$_2$Te$_3$, but only nitrogen-doped Sb$_2$Te$_3$ exhibits long-range ferromagnetism and preserve large bulk band gap. We further show that its corresponding thin-film can harbor QAHE at temperatures of 17-29 Kelvin, which is two orders of magnitude higher than the typical temperatures in similar systems. Our proposed \textit{nonmagnetic} doping scheme may shed new light in experimental realization of high-temperature QAHE in topological insulators. |
| Databáze: |
arXiv |
| Externí odkaz: |
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