Bulk Fermi surfaces of the Dirac type-II semimetallic candidate NiTe<sub>2</sub>
ORAL
Abstract
Here, we present a study on the Fermi-surface of the Dirac type-II semi-metallic candidate NiTe2 via the temperature and angular dependence of the de Haas-van Alphen (dHvA) effect measured in single-crystals grown through Te flux. In contrast to its isostructural compounds like PtSe2, band structure calculations predict NiTe2 to display a tilted Dirac node very close to its Fermi level that is located along the Γ to A high symmetry direction within its first Brillouin zone (FBZ). The angular dependence of the dHvA frequencies is found to be in agreement with the first-principle calculations when the electronic bands are slightly shifted with respect to the Fermi level (εF), and therefore provide support for the existence of a Dirac type-II node in NiTe2. Despite the coexistence of Dirac-like fermions with topologically trivial carriers, samples of the highest quality display an anomalous and large, either linear or sub-linear magnetoresistivity. This suggests that Lorentz invariance breaking Dirac-like quasiparticles dominate the carrier transport in this compound.
*This work was supported by DOE-BES through award DESC0002613. Wenkai Zheng was partially supported by NSF through NSF-DMR-1807969. The NHMFL is supported by NSF through NSF-DMR-1644779 and the State of Florida.
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Presenters
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Wenkai Zheng
- National High Magnetic Field Laboratory
- National High Magnetic Field Laboratory, Florida State University