Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Topological Semimetals - Experiment (joint session TT/MA)

MA 48.1: Vortrag

Donnerstag, 4. April 2019, 15:00–15:15, H2

Electronic structure of Weyl semimetal TaAs under pressure — •Zuzana Medvecka, Marcel Naumann, Markus Schmidt, Vicky Süß, Michael Nicklas und Elena Hassinger — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

Weyl semimetals are topological materials with linear band dispersion around pair of nodes with fixed opposite chirality. The quasiparticles from such nodes are predicted to induce novel quantum mechanical phenomena, such as Fermi arcs. However, to observe them in transport experiments, the Weyl nodes have to be sufficiently close to the Fermi level. Tantalum arsenide is a Weyl semimetal with a well-studied electronic structure, where the Weyl nodes lie 6 meV from Fermi level [1].

Here, we study how hydrostatic pressure impacts the Fermi level and electronic structure of TaAs. Quantum oscillations in resistivity of single-crystal TaAs samples are investigated in a piston type pressure cell. Pressure dependence of the electronic structure in TaAs is then obtained from the evolution of quantum oscillation frequencies.
F. Arnold, M. Naumann, S.-C. Wu, Y. Sun, M. Schmidt, H. Borrmann, C. Felser, B. Yan and E. Hassinger, PRL 117, 146401 (2016)