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  A large-energy-gap oxide topological insulator based on the superconductor BaBiO3

Yan, B. H., Jansen, M., & Felser, C. (2013). A large-energy-gap oxide topological insulator based on the superconductor BaBiO3. Nature Physics, 9(11), 709-711. doi:10.1038/NPHYS2762.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1E26-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-5177-5
Genre: Journal Article

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 Creators:
Yan, B. H.1, Author              
Jansen, M.2, Author              
Felser, C.3, Author              
Affiliations:
1Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863427              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Topological insulators are a new class of quantum materials that are characterized by robust topological surface states (TSSs) inside the bulk insulating gap(1,2), which hold great potential for applications in quantum information and spintronics as well as thermoelectrics. One major obstacle is the relatively small size of the bulk bandgap, which is typically around 0.3 eV for the known topological insulator materials (ref. 3 and references therein). Here we demonstrate through ab initio calculations that a known superconductor BaBiO3 (BBO) with a T-c of nearly 30 K (refs 4,5) emerges as a topological insulator in the electron-doped region. BBO exhibits a large topological energy gap of 0.7 eV, inside which a Dirac type of TSSs exists. As the first oxide topological insulator, BBO is naturally stable against surface oxidization and degradation, distinct from chalcogenide topological insulators(6-8). An extra advantage of BBO lies in its ability to serve as an interface between TSSs and superconductors to realize Majorana fermions for future applications in quantum computation(9).

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Language(s): eng - English
 Dates: 2013-11-08
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: eDoc: 671362
ISI: 000326685000011
DOI: 10.1038/NPHYS2762
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Title: Nature Physics
Source Genre: Journal
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Pages: - Volume / Issue: 9 (11) Sequence Number: - Start / End Page: 709 - 711 Identifier: ISSN: 1745-2473