Transport properties of the Dirac type-II semi-metal candidate PtTe$_2$

ORAL

Abstract

We investigated the electronic structure and transport properties via the temperature and angular dependence of the Shubnikov-de Haas (SdH) and de Haas van Alphen (dHvA) effect in single crystals of the semi-metallic platinum ditelluride (PtTe$_2$), recently claimed to be a novel type-II Dirac semimetal. Our high-quality PtTe$_2$ crystal displays non-saturating and large magnetoresistance at magnetic field up to 9 T. The dHvA oscillation reveals up to 8 frequencies suggesting a rather complex Fermi surface with evidence for a non-trivial Berry phase. The crystal quality improved considerably under subsequent annealing at high-temperatures leading to the observation of linear in field magnetoresistivity. Combined with effective masses in the order of $\sim 0.1$ free electron mass, these results further suggest that PtTe$_2$ displays bulk Dirac-like bands. Hall-effect measurements suggest that this compound is not a compensated semi-metal.

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Authors

  • Qiong Zhou

    • National High Magnetic Field Laboratory and Florida State University
    • NHMFL-FSU
    • NHMFL and FSU

  • Daniel Rhodes

    • National High Magnetic Field Laboratory and Florida State University

  • Yu-Che Chiu

    • National High Magnetic Field Laboratory and Florida State University

  • Kuan-Wen Chen

    • National High Magnetic Field Laboratory and Florida State University

  • Wenkai Zheng

    • National High Magnetic Field Laboratory and Florida State University

  • Rico Sh{\"o}nemann

    • National High Magnetic Field Laboratory and Florida State University

  • Erik Kampert

    • Dresden High Magnetic Field Laboratory

  • Tobias F{\"o}rster

    • Dresden High Magnetic Field Laboratory

  • Thomas Martin

    • Department of Chemistry, University of Texas, Dallas

  • Julia Chan

    • Department of Chemistry, University of Texas, Dallas

  • Luis Balicas

    • National High Magnetic Field Laboratory and Florida State University