Resonant impurity states in chemically disordered half-Heusler Dirac semimetals
Chadova K, Koedderitzsch D, Minar J, Ebert H, Kiss J, D'Souza SW, Wollmann L, Felser C, Chadov S (2016)
Publication Type: Journal article
Publication year: 2016
Journal
Book Volume: 93
Journal Issue: 19
DOI: 10.1103/PhysRevB.93.195102
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.
Involved external institutions
Ludwig-Maximilians-Universität (LMU)
Germany (DE)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Germany (DE)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
How to cite
APA:
Chadova, K., Koedderitzsch, D., Minar, J., Ebert, H., Kiss, J., D'Souza, S.W.,... Chadov, S. (2016). Resonant impurity states in chemically disordered half-Heusler Dirac semimetals. Physical Review B, 93(19). https://doi.org/10.1103/PhysRevB.93.195102
MLA:
Chadova, K., et al. "Resonant impurity states in chemically disordered half-Heusler Dirac semimetals." Physical Review B 93.19 (2016).
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