Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Topological Semimetals I
TT 7.11: Vortrag
Montag, 12. März 2018, 12:15–12:30, A 053
Correlation meets topology: quasiparticles along the Dirac nodal loop in ZrSiS — Sergio Pezzini1, Maarten van Delft1, Leslie Schoop2, Bettina Lotsch2, Antony Carrington3, Misha Katsnelson4, Nigel Hussey1, and •Steffen Wiedmann1 — 1High Field Magnet Laboratory (HFML-EMFL), Radboud University, Nijmegen 6525 ED, NL — 2Max Planck Institute for Solid State Research, 70569 Stuttgart, GER — 3H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK — 4Radboud University, Institute for Molecules and Materials, Nijmegen 6525 AJ, NL
ZrSiS belongs to the recently discovered family of topological Dirac materials whose electronic structure hosts Dirac-like crossing points that form a closed loop at the Fermi level. While transport measurements have shown the presence of small electron and hole pockets via the observation of low-frequency Shubnikov-de Haas oscillations, experimental evidence for the enhanced correlation effects predicted to occur in this class of semi-metals has until now been lacking.
We have performed a quantum oscillation study of the nodal-loop in high magnetic fields that reveals significant enhancement in the quasi-particle mass residing near the nodal loop. Above a threshold magnetic field (B > 25 T), magnetic breakdown occurs across gaps in the loop structure with orbits that enclose different windings around its vertices. The analysis of the amplitudes of these breakdown orbits reveals an anomalous temperature dependence demonstrating the emergence of novel, correlation-driven physics in ZrSiS associated with the Dirac-like quasiparticles [1].
S. Pezzini et al., Nature Physics, doi:10.1038/nphys4306 (2017).