Magnetotransport properties of thin pentatellurides

Here we report the magnetotransport properties of thin flakes of HfTe₅ and ZrTe₅, which have been reported to be in multiple possible phases (Dirac semimetal, weak TI, and strong TI). We observed a nonlinear Hall effect across thin flakes (<200 nm) at temperatures down to 1.6K, and we see a sign-change as the majority charge carrier changes in temperature. We then tuned the magnetotransport through an ionic liquid gate placed directly onto the flakes.