Magnetotransport and de Haas-van Alphen measurements in the type-II Weyl semimetal TaIrTe$_4$

TL;DR

This study investigates the electronic properties of the type-II Weyl semimetal TaIrTe4 through magnetotransport and quantum oscillation measurements, revealing its Weyl points are close to the Fermi level and can be tuned for enhanced chiral effects.

Contribution

The paper combines magnetotransport and de Haas-van Alphen measurements with DFT calculations to locate Weyl points near the Fermi level in TaIrTe4, highlighting tunability for chiral phenomena.

Findings

Resistivity does not saturate up to 70 T and follows a B^{1.5} dependence.

Four distinct quantum oscillation frequencies identified.

Weyl points are approximately 40-50 meV above the chemical potential.

Abstract

The layered ternary compound TaIrTe$_4$ has been predicted to be a type-II Weyl semimetal with only four Weyl points just above the Fermi energy. Performing magnetotransport measurements on this material we find that the resistivity does not saturate for fields up to 70 T and follows a $ \rho \sim B^{1.5}$ dependence. Angular-dependent de Haas-van Alphen (dHvA) measurements reveal four distinct frequencies. Analyzing these magnetic quantum oscillations by use of density functional theory (DFT) calculations we establish that in TaIrTe$_4$ the Weyl points are located merely $\sim$ 40-50 meV above the chemical potential, suggesting that the chemical potential can be tuned into the four Weyl nodes by moderate chemistry or external pressure, maximizing their chiral effects on electronic and magnetotransport properties.