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).
[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).
*This work is supported by NSF under grants DMR 1917579 and 1832031.
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Presenters
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Yanglin Zhu
- Department of Physics, Pennsylvania State University
- Pennsylvania State University