Owing to the coupling between open Fermi arcs on opposite surfaces, topological Dirac semimetals exhibit a new type of cyclotron orbit in the surface states known as Weyl orbit. Here, by lowering the carrier density in Cd3As2 nanoplates, we observe a crossover from multiple- to single-frequency Shubnikov-de Haas (SdH) oscillations when subjected to out-of-plane magnetic field, indicating the dominant role of surface transport. With the increase of magnetic field, the SdH oscillations further develop into quantum Hall state with non-vanishing longitudinal resistance. By tracking the oscillation frequency and Hall plateau, we observe a Zeeman-related splitting and extract the Landau level index as well as sub-band number. Different from conventional two-dimensional systems, this unique quantum Hall effect may be related to the quantized version of Weyl orbits. Our results call for further investigations into the exotic quantum Hall states in the low-dimensional structure of topological semimetals.
@article{arxiv.1612.05873,
title = {Evolution of Weyl orbit and quantum Hall effect in Dirac semimetal Cd3As2},
author = {Cheng Zhang and Awadhesh Narayan and Shiheng Lu and Jinglei Zhang and Huiqin Zhang and Zhuoliang Ni and Xiang Yuan and Yanwen Liu and Ju-Hyun Park and Enze Zhang and Weiyi Wang and Shanshan Liu and Long Cheng and Li Pi and Zhigao Sheng and Stefano Sanvito and Faxian Xiu},
journal= {arXiv preprint arXiv:1612.05873},
year = {2018}
}