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

M. R. Van Delft, S. Pezzini, T. Khouri, C. S.A. Müller, M. Breitkreiz, L. M. Schoop, A. Carrington, N. E. Hussey, S. Wiedmann

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Abstract

We report a study of quantum oscillations in the high-field magnetoresistance 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 (US)
Article number256602
JournalPhysical review letters
Volume121
Issue number25
DOIs
StatePublished - Dec 18 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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