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

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 and Faxian Xiu ()
Additional contact information
Cheng Zhang: Fudan University
Awadhesh Narayan: Trinity College
Shiheng Lu: Fudan University
Jinglei Zhang: Chinese Academy of Sciences
Huiqin Zhang: Fudan University
Zhuoliang Ni: Fudan University
Xiang Yuan: Fudan University
Yanwen Liu: Fudan University
Ju-Hyun Park: National High Magnetic Field Laboratory
Enze Zhang: Fudan University
Weiyi Wang: Fudan University
Shanshan Liu: Fudan University
Long Cheng: Chinese Academy of Sciences
Li Pi: Chinese Academy of Sciences
Zhigao Sheng: Chinese Academy of Sciences
Stefano Sanvito: Trinity College
Faxian Xiu: Fudan University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: 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-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.

Date: 2017
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DOI: 10.1038/s41467-017-01438-y

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