Evolution of Weyl orbit and quantum Hall effect in Dirac semimetal Cd3As2

• DOI: 10.1038/s41467-017-01438-y
• Publication Date: 2017-10-27T19:11:19Z
• Authors: Cheng Zhang; Awadhesh Narayan; Shiheng Lu; Jinglei Zhang; Huiqin Zhang; Zhuoliang Ni; Xiang Yuan; Yanwen Liu; Ju-Hyun Park; Enze Zhang; Weiyi Wang; Shanshan Liu; Long Cheng; Li Pi; Zhigao Sheng; Stefano Sanvito; Faxian Xiu
• Keywords: Landau quantization; Shubnikov–de Haas effect; Weyl semimetal

Abstract Owing to the coupling between open Fermi arcs on opposite surfaces, topological Dirac semimetals exhibit a new type of cyclotron orbit in surface states known as Weyl orbit. Here, by lowering carrier density Cd 3 As 2 nanoplates, we observe crossover from multiple-frequency single-frequency Shubnikov–de Haas (SdH) oscillations when subjected out-of-plane magnetic field, indicating dominant role transport. With increase SdH further develop into quantum Hall state with non-vanishing longitudinal resistance. By tracking oscillation frequency and plateau, Zeeman-related splitting extract Landau level index well sub-band number. Different conventional two-dimensional systems, this unique effect may be related quantized version orbits. Our results call for investigations exotic low-dimensional structure semimetals.