Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 33: Transport: Topological Semimetals 2 (jointly with MA/TT)

DS 33.4: Vortrag

Mittwoch, 22. März 2017, 15:45–16:00, HSZ 204

Magneto-optical infrared studies of the Weyl semimetals TaAs, TaP and NbPD. Neubauer1, R. Kemmler1, W. Li1, R. Hübner2, A. Löhle1, M. Schilling1, M. Schmidt3, C. Shekhar3, C. Felser3, M. Dressel1, and •A. V. Pronin111. 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.

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DPG-Physik > DPG-Verhandlungen > 2017 > Dresden