Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: Topological Semimetals 2

TT 27.6: Vortrag

Dienstag, 17. März 2020, 15:15–15:30, HSZ 103

Field-induced electron-hole tunneling in nodal-line semimetals revealed by quantum oscillations — •Claudius Müller1, Thomas Khouri1, Maarten van Delft1, Sergio Pezzini1, Yu-Te Hsu1, Maxim Breitkreiz2, Leslie Schoop3, Antony Carrington4, Nigel Hussey1, and Steffen Wiedmann11High Field Magnet Laboratory (HFML-EMFL), IMM, Radboud University, Nijmegen, the Netherlands — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Germany — 3Department of Chemistry, Princeton University, New Jersey, USA — 4H. H. Wills Physics Laboratory, University of Bristol, UK

We report an investigation of de Haas-van Alphen quantum oscillations in the nodal-line semimetal ZrSiS via capacitive magnetometry measurements in high magnetic fields up to 35 T. By carrying out a full angle dependence, we are able to determine the Fermi surface (FS) of ZrSiS which complements but extends the original Shubnikov-de Haas measurements reported in [1]. For H//c, we observe a complex oscillation spectrum originating from individual electron and hole pockets, as well as oscillations caused by magnetic breakdown (MB). The MB orbits can be seen as a manifestation of Klein tunneling in momentum space, first reported in HfSiS [2], although in a regime of partial transmission due to a small spin-orbit gap between adjacent pockets. Comparison of our experimental observations with theoretical predictions provides us with a full picture of the electronic ground state.

[1] S. Pezzini et al., Nature Physics 14, 178 (2018)

[2] M. van Delft et al., Phys. Rev. Lett. 121, 256602 (2018)

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