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  Prediction of Near-Room-Temperature Quantum Anomalous Hall Effect on Honeycomb Materials

Wu, S.-C., Shan, G., & Yan, B. (2014). Prediction of Near-Room-Temperature Quantum Anomalous Hall Effect on Honeycomb Materials. Physical Review Letters, 113(25): 256401, pp. 1-5. doi:10.1103/PhysRevLett.113.256401.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-9E27-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-8233-F
Genre: Journal Article

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 Creators:
Wu, Shu-Chun1, Author              
Shan, Guangcun1, Author              
Yan, Binghai2, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863427              

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 Abstract: Recently, the long-sough quantum anomalous Hall effect was realized in a magnetic topological insulator. However, the requirement of an extremely low temperature (approximately 30 mK) hinders realistic applications. Based on ab initio band structure calculations, we propose a quantum anomalous Hall platform with a large energy gap of 0.34 and 0.06 eV on honeycomb lattices comprised of Sn and Ge, respectively. The ferromagnetic (FM) order forms in one sublattice of the honeycomb structure by controlling the surface functionalization rather than dilute magnetic doping, which is expected to be visualized by spin polarized STM in experiment. Strong coupling between the inherent quantum spin Hall state and ferromagnetism results in considerable exchange splitting and, consequently, an FM insulator with a large energy gap. The estimated mean-field Curie temperature is 243 and 509 K for Sn and Ge lattices, respectively. The large energy gap and high Curie temperature indicate the feasibility of the quantum anomalous Hall effect in the near-room-temperature and even room-temperature regions.

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Language(s): eng - English
 Dates: 2014-12-15
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 14810098
DOI: 10.1103/PhysRevLett.113.256401
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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 113 (25) Sequence Number: 256401 Start / End Page: 1 - 5 Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1