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TT: Fachverband Tiefe Temperaturen
TT 38: Topological Semimetals I
TT 38.6: Talk
Wednesday, March 20, 2024, 10:45–11:00, H 3010
Determination of the Fermi surface of the topological semimetal PdGa using quantum oscillations — Nico Huber1, •Ivan Volkau1, Alexander Engelhardt1, Andreas Bauer1,3, Christian Pfleiderer1,2,3, and Marc A. Wilde1,3 — 1Technical University of Munich (TUM) — 2MCQST, Munich — 3TUM Zentrum für Quantum Engineering (ZQE), Munich
Weyl semimetals have generated great interest in recent years due to their non-trivial topological characteristics like anomalous magnetotransport and unusual photogalvanic responses [1]. However, topological band degeneracies are not limited to points but can also be enforced on entire planes in reciprocal space [2], the so-called nodal planes (NPs). The experimental identification of NPs in the ferromagnetic state of MnSi [3] and its paramagnetic sibling CoSi [4] raises the question whether they can also be observed in other B20 compounds as theory predicts. In this work, we study the Fermi surface of PdGa using quantum oscillations. Shubnikov-de Haas and de Haas-van Alphen spectra were recorded at different orientations of the magnetic field up to 18 T and at temperatures down to 1.5K. The oscillation frequencies, angular dispersion, and effective masses taken together with the calculated magnetic breakdown orbits are in good agreement with first principle calculations, confirming the predicted electronic structure of this compound.
[1] Ma et al., Nat. Mater. 15 (2016) 1140
[2] Furusaki et al., Sci. Bull. 62 (2017) 788
[3] Wilde et al., Nature 594 (2021) 374
[4] Huber et al., Phys. Rev. Lett. 129 (2022) 026401
Keywords: PdGa; B20 systems; nodal planes; quantum oscillations