Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 49: Transport: Topological Semimetals 2 (jointly with DS, MA, HL, O)
TT 49.4: Talk
Wednesday, March 22, 2017, 15:45–16:00, HSZ 204
Magneto-optical infrared studies of the Weyl semimetals TaAs, TaP and NbP — D. Neubauer1, R. Kemmler1, W. Li1, R. Hübner2, A. Löhle1, M. Schilling1, M. Schmidt3, C. Shekhar3, C. Felser3, M. Dressel1, and •A. V. Pronin1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2FMQ, Universität Stuttgart, Germany — 3MPI CPfS, Dresden, Germany
We have investigated the infrared response of TaAs, TaP, and NbP in zero magnetic field and in fields of up to 30 T. Additionally, magneto-transport measurements have been conducted on the same samples. In all compounds, we can reliably trace the transitions between different Landau levels. The transition frequencies demonstrate a square-root field dependence, typical for the linearly dispersed bands. In TaP, we can also see a sizeable shifting of the plasma edge in magnetic field and an interplay between this plasma-edge shift and the Landau-level transitions. We compare the optical spectra of the three compounds, describe the spectra by the recent models for the (magneto)-optical response of Weyl semimetals, and extract such parameters as the Fermi velocities of the carriers in the Weyl bands and the positions of the Fermi levels relative to the Weyl points.