Linear-in-Frequency Optical Conductivity in GdPtBi due to Transitions near the Triple Points
Huett F, Yaresko A, Schilling MB, Shekhar C, Felser C, Dressel M, Pronin AV (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 121
Article Number: 176601
Journal Issue: 17
DOI: 10.1103/PhysRevLett.121.176601
Abstract
The complex optical conductivity of the half-Heusler compound GdPtBi is measured in a frequency range from 20 to 22 000 cm-1 (2.5 meV-2.73 eV) at temperatures down to 10 K in zero magnetic field. We find the real part of the conductivity, σ1(ω), to be almost perfectly linear in frequency over a broad range from 50 to 800 cm-1 (∼6-100 meV) for T≤50 K. This linearity strongly suggests the presence of three-dimensional linear electronic bands with band crossings (nodes) near the chemical potential. Band-structure calculations show the presence of triple points, where one doubly degenerate and one nondegenerate band cross each other in close vicinity of the chemical potential. From a comparison of our data with the optical conductivity computed from the band structure, we conclude that the observed nearly linear σ1(ω) originates as a cumulative effect from all the transitions near the triple points.
Involved external institutions
Universität Stuttgart
Germany (DE)
Max-Planck-Institut für Festkörperforschung
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 Festkörperforschung
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:
Huett, F., Yaresko, A., Schilling, M.B., Shekhar, C., Felser, C., Dressel, M., & Pronin, A.V. (2018). Linear-in-Frequency Optical Conductivity in GdPtBi due to Transitions near the Triple Points. Physical Review Letters, 121(17). https://doi.org/10.1103/PhysRevLett.121.176601
MLA:
Huett, F., et al. "Linear-in-Frequency Optical Conductivity in GdPtBi due to Transitions near the Triple Points." Physical Review Letters 121.17 (2018).
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