Photogalvanic effect in Weyl semimetals from first principles
Zhang Y, Ishizuka H, Van Den Brink J, Felser C, Yan B, Nagaosa N (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 97
Article Number: 241118
Journal Issue: 24
DOI: 10.1103/PhysRevB.97.241118
Abstract
Using first-principles calculations, we investigate the photogalvanic effect in the Weyl semimetal material TaAs. We find colossal photocurrents caused by the Weyl points in the band structure in a wide range of laser frequency. Our calculations reveal that the photocurrent is predominantly contributed by the three-band transition from the occupied Weyl band to the empty Weyl band via an intermediate band away from the Weyl cone, for excitations both by linearly and circularly polarized light. Therefore, it is essential to sum over all three-band transitions by considering a full set of Bloch bands (both Weyl bands and trivial bands) in the first-principles band structure while it does not suffice to only consider the two-band direct transition within a Weyl cone. The calculated photoconductivities are well consistent with recent experiment measurements. Our work provides a first-principles calculation on nonlinear optical phenomena of Weyl semimetals and provides a deeper understanding of the photogalvanic effects in complexed materials.
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
University of Tokyo
Japan (JP)
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Weizmann Institute of Science
Israel (IL)
Germany (DE)
University of Tokyo
Japan (JP)
Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden
Germany (DE)
Weizmann Institute of Science
Israel (IL)
How to cite
APA:
Zhang, Y., Ishizuka, H., Van Den Brink, J., Felser, C., Yan, B., & Nagaosa, N. (2018). Photogalvanic effect in Weyl semimetals from first principles. Physical Review B, 97(24). https://doi.org/10.1103/PhysRevB.97.241118
MLA:
Zhang, Yang, et al. "Photogalvanic effect in Weyl semimetals from first principles." Physical Review B 97.24 (2018).
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