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

ABSTRACT: 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-frequency 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-dimensi

SUBMITTER: Zhang C 

PROVIDER: S-EPMC5668429 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature