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

By Binghai Yan, M. Jansen, Claudia Felser. Nature Physics, 2013

164 citations recorded by the source corpus.

An ab initio study suggests that a known oxide superconductor, BaBiO3, can be doped into a topological insulating state. This would simplify topological insulator–superconductor structures for applications. Topological insulators are a new class of quantum materials that are characterized by robust topological surface states (TSSs) inside the bulk insulating gap1,2, 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 Tc 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 insulators6,7,8. 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 computation9.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/3236a7762d733d114155b9c9fcc483da0ac99c09

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In Atomic and Molecular Physics, and Optics

1. Tanmoy Das
2. Hsin Lin
3. Arun Bansil

In Condensed Matter Physics

1. Hsin Lin
2. Tanmoy Das
3. Arun Bansil

In Materials Chemistry

1. Tanmoy Das
2. Hsin Lin
3. Arun Bansil

Citations in the corpus

• Colloquium : Topological band theory (2016, background): “The band inversion between Bi- and O-p states in YBiO3 upon the inclusion of SOC occurs at TRIM points R, rather than at Γ. (Jin et al. 2013) BaBiO3 is a known superconductor with Tc ~ 30 K, (Sleight, Gillson, and Bierstedt 1975; Cava et al. 1988) which is predicted by DFT to have a large topologica”