A possible candidate for triply degenerate point fermions in trigonal layered PtBi(2).
A possible candidate for triply degenerate point fermions in trigonal layered PtBi(2).
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三角层状 PtBi2 中三重简并点费米子的可能候选者
DOI:
10.1038/s41467-018-05730-3
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发表时间:
2018-08-14
影响因子:
16.6
通讯作者:
Tian M
中科院分区:
文献类型:
--
作者:
Gao W;Zhu X;Zheng F;Wu M;Zhang J;Xi C;Zhang P;Zhang Y;Hao N;Ning W;Tian M
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. Triply degenerate point (TP) fermions have been reported in MoP but the TPs are far below the Fermi level. Here, Guo et al. predict and verify the possible existence of TP fermions in trigonal layered PtBi2, where the TP points are close to the Fermi level.
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