A possible candidate for triply degenerate point fermions in trigonal layered PtBi2

Wenshuai Gao, Xiangde Zhu, Fawei Zheng, Min Wu, Jinglei Zhang, Chuanying Xi, Ping Zhang, Yuheng Zhang, Ning Hao (), Wei Ning () and Mingliang Tian ()
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Wenshuai Gao: Chinese Academy of Sciences
Xiangde Zhu: Chinese Academy of Sciences
Fawei Zheng: Institute of Applied Physics and Computational Mathematics
Min Wu: Chinese Academy of Sciences
Jinglei Zhang: Chinese Academy of Sciences
Chuanying Xi: Chinese Academy of Sciences
Ping Zhang: Institute of Applied Physics and Computational Mathematics
Yuheng Zhang: Chinese Academy of Sciences
Ning Hao: Chinese Academy of Sciences
Wei Ning: Chinese Academy of Sciences
Mingliang Tian: Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Triply degenerate point (TP) fermions in tungsten–carbide-type materials (e.g., MoP), which represent new topological states of quantum matter, have generated immense interest recently. However, the TPs in these materials are found to be far below the Fermi level, leading to the TP fermions having less contribution to low-energy quasiparticle excitations. Here, we theoretically predict the existence of TP fermions with TP points close to the Fermi level in trigonal layered PtBi2 by ab initio calculations, and experimentally verify the predicted band topology by magnetotransport measurements under high magnetic fields up to 40 T. Analyses of both the pronounced Shubnikov–de Haas and de Haas–van Alphen oscillations reveal the existence of six principal Fermi pockets. Our experimental results, together with those from ab initio calculations, reveal the interplay between transport behaviors and unique electronic structures, and support the existence of TP fermions in trigonal layered PtBi2.

Date: 2018
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DOI: 10.1038/s41467-018-05730-3

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