Electron-Hole Tunneling Revealed by Quantum Oscillations in the Nodal-Line Semimetal HfSiS

MR van Delft, S Pezzini, T Khouri, CSA Muller, M Breitkreiz, L Schoop, Antony Carrington, Nigel Hussey, S Wiedmann

Research output: Contribution to journalArticle (Academic Journal)peer-review

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We report a study of quantum oscillations in the high-field magneto-resistance of the nodal-line semimetal HfSiS. In the presence of a magnetic field up to 31 T parallel to the c-axis, we observe quantum oscillations originating both from orbits of individual electron and hole pockets, and from magnetic breakdown between these pockets. In particular, we reveal a breakdown orbit enclosing one electron and one hole pocket in the form of a figure of eight, which is a manifestation of Klein tunneling in momentum space, although in a regime of partial transmission due to the finite separation between the pockets. The observed very strong dependence of the oscillation amplitude on the field angle and the cyclotron masses of the orbits are in agreement with the theoretical predictions for this novel tunneling phenomenon.
Original languageEnglish
Article number256602
Number of pages6
JournalPhysical Review Letters
Issue number25
Early online date18 Dec 2018
Publication statusPublished - 21 Dec 2018


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