Negative magnetoresistance in Dirac semimetal Cd3As2

Hui Li, Hongtao He, Hai-Zhou Lu, Huachen Zhang, Hongchao Liu, Rong Ma, Zhiyong Fan, Shun-Qing Shen () and Jiannong Wang ()
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Hui Li: The Hong Kong University of Science and Technology
Hongtao He: South University of Science and Technology of China
Hai-Zhou Lu: South University of Science and Technology of China
Huachen Zhang: The Hong Kong University of Science and Technology
Hongchao Liu: The Hong Kong University of Science and Technology
Rong Ma: The Hong Kong University of Science and Technology
Zhiyong Fan: The Hong Kong University of Science and Technology
Shun-Qing Shen: The University of Hong Kong
Jiannong Wang: The Hong Kong University of Science and Technology

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract A large negative magnetoresistance (NMR) is anticipated in topological semimetals in parallel magnetic fields, demonstrating the chiral anomaly, a long-sought high-energy-physics effect, in solid-state systems. Recent experiments reveal that the Dirac semimetal Cd3As2 has the record-high mobility and positive linear magnetoresistance in perpendicular magnetic fields. However, the NMR has not yet been unveiled. Here we report the observation of NMR in Cd3As2 microribbons in parallel magnetic fields up to 66% at 50 K and visible at room temperatures. The NMR is sensitive to the angle between magnetic and electrical fields, robust against temperature and dependent on the carrier density. The large NMR results from low carrier densities in our Cd3As2 samples, ranging from 3.0 × 1017 cm−3 at 300 K to 2.2 × 1016 cm−3 below 50 K. We therefore attribute the observed NMR to the chiral anomaly. In perpendicular magnetic fields, a positive linear magnetoresistance up to 1,670% at 14 T and 2 K is also observed.

Date: 2016
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DOI: 10.1038/ncomms10301

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