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Transport evidence of triply degenerate nodal semimetal YRh<sub>6</sub>Ge<sub>4</sub>

ORAL

Abstract

Triply-degenerate nodal semimetal (TDNS) represents a new topological quantum state [1,2]. In this talk, we report our magnetotransport studies on YRh6Ge4, which was recently predicted to be a TDNS[3]. We find it exhibits remarkable signatures of a chiral anomaly, manifested by large negative longitudinal magnetoresistance, quadratic field dependence of magnetoconductance and planar Hall effect [4]. Furthermore, we have also observed Shubnikov-de Haas (SdH) quantum oscillations, the analyses of which reveals two point-like Fermi surfaces consistent with the calculated band structure; these pockets host nearly massless three-component fermions. These results suggest YRh6Ge4 may serve as a model system to probe the exotic properties of three-component fermions and understand their underlying physics.

[1] Bradlyn, B., Cano, J., Wang, Z., Vergniory, M. G., Felser, C., Cava, R. J. & Bernevig, B. A.. Science 10, 1126, (2016).
[2] Zhu, Z., Winkler, G. W., Wu, Q., Li, J. & Soluyanov, A. A. Physical Review X 6, 031003, (2016).
[3] Guo, P.-J., Yang, H.-C., Liu, K. & Lu, Z.-Y. Phys. Rev. B 98, 045134, (2018).
[4] Nandy, S., Sharma, G., Taraphder, A. & Tewari, S. Phys. Rev. Lett 119, 176804, (2017).

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Presenters

  • Yanglin Zhu

    Department of Physics, Pennsylvania State University, Pennsylvania State University

Authors

  • Yanglin Zhu

    Department of Physics, Pennsylvania State University, Pennsylvania State University

  • Xin Gui

    Department of Chemistry, Louisiana State University, Louisiana State University, Baton Rouge

  • Yu Wang

    Physics, Pennsylvania State University, Physics, The Pennsylvania State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Physics, Penn State University, Pennsylvania state University

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, Florida State University, Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Lab, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory-Florida State University, National High Magnetic Field Laboratory, Tallahassee, FL, NHMFL, Florida State University, NHMFL

  • Weiwei Xie

    Chemistry, Louisiana State University, Louisiana State University, Department of Chemistry, Louisiana State University, Louisiana State University, Baton Rouge

  • Zhiqiang Mao

    Pennsylvania State University, Tulane University, Physics, Pennsylvania State University, Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Penn State University, Physics, Penn State University, The Pennsylvania State University