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Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Topological Semimetals

TT 25.9: Talk

Thursday, September 8, 2022, 12:00–12:15, H3

Fermi surface of the chiral topological semimetal PtGa — •B.V. Schwarze1,2, M. Uhlarz1, J. Hornung1,2, S. Chattopadhyay1, K. Manna3,4, S. Shekhar3, C. Felser3, and J. Wosnitza1,21Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, HZDR, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Max Plank Institute for Chemical Physics of Solids, Germany — 4Indian Institute of Technology Delhi, India

PtGa is a chiral topological semimetal hosting two band-touching nodes with a maximal Chern number of four. Previously, we reported on angle-resolved photoemission spectroscopy measurements revealing giant spin-split Fermi arcs verifying the topology [1]. Here, we present our detailed investigation of the bulk Fermi surfaces of PtGa with angular-dependent de Haas-van Alphen (dHvA) measurements and band-structure calculations. Strong spin-orbit coupling leads to well separated spin-split bands. Eight bands cross the Fermi energy forming a multitude of Fermi surfaces resulting in intricate dHvA spectra. The assignment of the experimentally observed dHvA frequencies to the corresponding calculated extremal orbits is challenging, because of their considerable quantity and proximity. Yet, the experiment is in good agreement with the calculations further confirming the topological character of PtGa.

[1] M. Yao, K. Manna et al., Nat. Commun. 11, 2033 (2020).

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