SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: Topological Insulators and Semimetals (joint session TT/KFM)
TT 27.9: Talk
Friday, October 1, 2021, 12:15–12:30, H7
A quantum oscillation study in the Dirac nodal-line semimetal HfSiS — •Claudius Müller1, Jasper Linnartz1, Leslie Schoop2, Nigel Hussey1,3, and Steffen Wiedmann1 — 1High Field Magnet Laboratory (HFML-EMFL), IMM, Radboud University, Nijmegen, the Netherlands — 2Department of Chemistry, Princeton University, Princeton, New Jersey, USA — 3H. H. Wills Physics Laboratory, University of Bristol, Bristol, UK
We have performed a de Haas - van Alphen (dHvA) quantum oscillation study of HfSiS in high magnetic fields up to 31 T. For parallel alignment of the magnetic field and the c-axis, we observe quantum oscillations originating from individual electron and hole pockets, as well as oscillations caused by magnetic breakdown (MB) between these pockets. The MB orbits come in a wide variety, ranging from a so-called ’figure-of-eight’ orbit to orbits enclosing large areas in the Brillouin zone (BZ). These MB orbits can be seen as a manifestation of Klein tunneling in momentum space [1], although in a regime of partial transmission due to the finite separation between adjacent pockets. Our experimental observation, the strong dependence of the oscillation amplitude on the field angle and the cyclotron masses of the MB orbits, is in good agreement with the theoretical predictions for this novel tunneling phenomenon.
[1] M. van Delft et al., Phys. Rev. Lett. 121, 256602 (2018)