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  Resonant impurity states in chemically disordered half-Heusler Dirac semimetals

Chadova, K., Ködderitzsch, D., Minar, J., Ebert, H., Kiss, J., D'Souza, S. W., et al. (2016). Resonant impurity states in chemically disordered half-Heusler Dirac semimetals. Physical Review B, 93(19): 195102, pp. 1-7. doi:10.1103/PhysRevB.93.195102.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-C56D-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-69D8-6
Genre: Journal Article

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 Creators:
Chadova, K.1, Author
Ködderitzsch, D.1, Author
Minar, J.1, Author
Ebert, H.1, Author
Kiss, J.2, Author              
D'Souza, S. W.2, Author              
Wollmann, L.2, Author              
Felser, C.3, Author              
Chadov, S.4, Author              
Affiliations:
1External Organizations, escidoc:persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863429              
4Stanislav Chadov, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863440              

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 Abstract: We address the electron transport characteristics in bulk half-Heusler alloys with their compositions tuned to the borderline between topologically nontrivial semimetallic and trivial semiconducting phases. Accurate first-principles calculations based on the coherent potential approximation (CPA) reveal that all the studied systems exhibit sets of dispersionless impurity-like resonant levels, with one of them being located at the Dirac point. By means of the Kubo-Bastin formalism we reveal that the residual conductivity of these alloys is strongly suppressed by impurity scattering, whereas the spin Hall conductivity exhibits a rather complex behavior induced by the resonant states. In particular for LaPt0.5Pd0.5Bi we find that the total spin Hall conductivity is strongly suppressed by two large and opposite contributions: the negative Fermi-surface contribution produced by the resonant impurity and the positive Fermi-sea term stemming from the occupied states. At the same time, we identify no conductivity contributions from the conical states.

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Language(s): eng - English
 Dates: 2016-05-022016-05-02
 Publication Status: Published in print
 Pages: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 93 (19) Sequence Number: 195102 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925225008