Transport properties and ARPES measurements of the Dirac line-node semimetals CaTX

ORAL

Abstract

Recently noncentrosymmetric CaAgAs crystallizing in the P-6 2m space group has been proposed to be a topological line-node semimetal with only nontrivial bands near the Fermi level. In this talk we present magneto-transport properties, ARPES measurements and DFT calculations of single crystalline CaAgAs and its sister compound CaCdGe. At 2K and 9 T, linear transverse magnetoresistance (MR) up to 18{\%} is observed in CaAgAs while extremely large non-saturating quadratic MR up to 2500{\%} shows up in CaCdGe, attributing to the electron-hole compensation revealed by Hall measurements. This is consistent with the DFT calculation which reveals two hole and one electron Fermi pockets in CaCdGe. Angle-dependent Shubnikov-de Haas oscillations in CaCdGe resolve one of the hole Fermi pockets revealed by DFT. ARPES measurements on both compounds will be discussed too.

*Work at UCLA was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES) under Award Number DE-SC0011978.

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Authors

  • Eve Emmanouilidou

    • Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA

  • Bing Shen

    • Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA

  • Aoshuang Shi

    • Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA

  • Ni Ni

    • Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA

  • Chang Liu

    • Department of Physics, South University of Science and Technology of China, Shenzhen, Guangdong 518055, China

  • Xiaoyu Deng

    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA

  • Gabriel Kotliar

    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA

  • Suyang Xu

    • Department of Physics, MIT, Cambridge, MA, 02139, USA