Shubnikov-de Haas Oscillations in 3D Dirac semimetal Cd3As2

ORAL

Abstract

Cadmium arsenide (Cd3As2) was known for its inverted band structure and ultra-high electron mobility. It has been theoretically predicted to exhibit a 3D Dirac semimetal phase containing degenerate Weyl nodes, which was recently confirmed by ARPES experiments. By conducting magneto-transport measurements in high quality single crystals of Cd3As2, we found a single frequency F $=$ 67 Tesla in the Shubnikov-de Haas (SdH) oscillations giving an effective mass m* $=$ 0.057 me with electron mobility as high as 99,500 cm$^{2}$/V-sec, which is consistent with the calculated 3D Dirac semimetal band. In a certain field orientation, we found a splitting of the SdH oscillation frequency in the FFT spectrum, which infers a possible lifting of the degeneracies. Detailed magnetotransport data in several doped and undoped single crystals of Cd3As2 will be presented and discussed.

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Authors

  • Shih-Ting Guo

    • Institute of Physics, Academia Sinica, Taipei, Taiwan

  • R. Sankar

    • Department of Physics, National Tsing Hua University, Hsinchu, Taiwan

  • Yung-Yu Chien

    • Institute of Physics, Academia Sinica, Taipei, Taiwan

  • Horng-Tay Jeng

    • Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan

  • F.C. Chou

    • Department of Physics, National Tsing Hua University, Hsinchu, Taiwan

  • Wei-Li Lee

    • Institute of Physics, Academia Sinica, Taipei, Taiwan