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TT: Fachverband Tiefe Temperaturen
TT 27: Topological Semimetals 2
TT 27.2: Vortrag
Dienstag, 17. März 2020, 14:15–14:30, HSZ 103
Shubnikov-de Haas oscillations in the Weyl type-II semimetal WTe2 — •Jasper Linnartz1, Claudius Müller1, Martin Bremholm2, Nigel Hussey1, and Steffen Wiedmann1 — 1High Field Magnet Laboratory (HFML-EMFL), IMM, Radboud University, Nijmegen, the Netherlands — 2Department of Chemistry and iNANO, Aarhus University, Aarhus, Denmark
The transition metal dicalcogenide WTe2 in the Td phase is a Weyl type-II semimetal. By analyzing the Shubnikov-de Haas oscillations superimposed on the quadratic magnetoresistance in WTe2 up to 30 T and their temperature-dependent amplitude, we determine the Fermi surface and extract the cyclotron masses of the individual pockets.
Following the high resolution quantum oscillation thermopower experiments [1], we determined in total four individual pockets. Above a threshold magnetic field, we discover orbits due to magnetic breakdown due to nested electron and hole pockets which is confirmed by a cyclotron mass analysis.
[1] Z. Zhu et al., Phys. Rev. Lett. 114, 176601 (2015)