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Functionalized bismuth films: Giant gap quantum spin Hall and valley-polarized quantum anomalous Hall states
- Source :
- Physical review / B 91(4), 041303 (2015). doi:10.1103/PhysRevB.91.041303, ResearcherID
- Publication Year :
- 2015
- Publisher :
- APS, 2015.
-
Abstract
- The search for new large band gap quantum spin Hall (QSH) and quantum anomalous Hall (QAH) insulators is critical for their realistic applications at room temperature. Here we predict, based on first principles calculations, that the band gap of QSH and QAH states can be as large as 1.01 eV and 0.35 eV in an H-decorated Bi(111) film. The origin of this giant band gap lies both in the large spin-orbit interaction of Bi and the H-mediated exceptional electronic and structural properties. Moreover, we find that the QAH state also possesses the properties of quantum valley Hall state, thus intrinsically realising the so-called valley-polarized QAH effect. We further investigate the realization of large gap QSH and QAH states in an H-decorated Bi(\={1}10) film and X-decorated (X=F, Cl, Br, and I) Bi(111) films.<br />submitted to Physical Reveiw Letters on 25th of September 2014
- Subjects :
- Physics
Condensed Matter - Materials Science
Condensed matter physics
Condensed Matter - Mesoscale and Nanoscale Physics
Band gap
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
chemistry.chemical_element
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Bismuth
chemistry
Quantum spin Hall effect
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
ddc:530
Quantum
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Physical review / B 91(4), 041303 (2015). doi:10.1103/PhysRevB.91.041303, ResearcherID
- Accession number :
- edsair.doi.dedup.....1d7f86a1e793aa0beb1d4c9dcba28d4a
- Full Text :
- https://doi.org/10.1103/PhysRevB.91.041303