Evidence for Layered Quantized Transport in Dirac Semimetal ZrTe5

Abstract

Abstract ZrTe 5 is an important semiconductor thermoelectric material and a candidate topological insulator. Here we report the observation of Shubnikov-de Hass (SdH) oscillations accompanied by quantized Hall resistance in bulk ZrTe 5 crystal, with a mobility of 41,000 cm 2 V −1 s −1 . We have found that the quantum oscillations does not originate from the surface states, but from the bulk states. Each single layer ZrTe 5 acted like an independent 2D electron system in the quantum Hall regime having the same carrier density and mobilities, while the bulk of the sample exhibits a multilayered quantum Hall effect.