Electronic properties of topological insulator candidate CaAgAs
Nayak J, Kumar N, Wu SC, Shekhar C, Fink J, Rienks EDL, Fecher GH, Sun Y, Felser C (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 30
Article Number: 045501
Journal Issue: 4
Abstract
The topological phases of matter provide the opportunity to observe many exotic properties, such as the existence of 2D topological surface states in the form of Dirac cones in topological insulators and chiral transport through the open Fermi arc in Weyl semimetals. However, these properties affect the transport characteristics and, therefore, may be useful for applications only if the topological phenomena occur near the Fermi level. CaAgAs is a promising candidate for which the ab initio calculations predict line-nodes at the Fermi energy. However, the compound transforms into a topological insulator on considering spin-orbit interaction. In this study, we investigated the electronic structure of CaAgAs with angle-resolved photoemission spectroscopy (ARPES), ab initio calculations, and transport measurements. The results from ARPES show that the bulk valence band crosses the Fermi energy at the Γ-point. The measured band dispersion matches the ab initio calculations closely when shifting the Fermi energy in the calculations by -0.5 eV. The ARPES results are in good agreement with transport measurements, which show abundant p-type carriers.
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Germany (DE)
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
How to cite
APA:
Nayak, J., Kumar, N., Wu, S.-C., Shekhar, C., Fink, J., Rienks, E.D.L.,... Felser, C. (2018). Electronic properties of topological insulator candidate CaAgAs. Journal of Physics: Condensed Matter, 30(4). https://doi.org/10.1088/1361-648X/aaa1cd
MLA:
Nayak, Jayita, et al. "Electronic properties of topological insulator candidate CaAgAs." Journal of Physics: Condensed Matter 30.4 (2018).
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