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).
复制标题

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
复制
发表时间:
2018-08-14
影响因子:
16.6
通讯作者:
Tian M
Tian M
中科院分区:
综合性期刊1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

文献摘要

参考文献

被引文献

相似文献

碳化钨材料(如MOP)中的三重简并点(TP)费米子代表了量子物质的新拓扑态,近年来引起了人们的极大兴趣。然而,这些材料中的TPS远低于费米能级,导致Tp费米子对低能准粒子激发的贡献较小。在这里,我们通过从头计算从理论上预言了Tp点接近费米能级的Tp费米子在三角层状PtBi2中的存在,并通过在高达40 T的强磁场下的磁输运测量实验验证了预测的能带拓扑。我们的实验结果和从头计算的结果一起揭示了输运行为和独特的电子结构之间的相互作用,并支持在三角层状PtBi2中存在TP费米子。在MOP中已经报道了三重简并点(TP)费米子,但TPS远低于费米能级。在这里,郭等人。预测和验证了三方层状PtBi2中可能存在的TP费米子,其中TP点接近费米能级。
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.
DOI: 10.1103/physrevlett.94.166601
发表时间: 2005-04-29
影响因子: 8.6
作者:
Du, X;Tsai, SW;Hebard, AF
通讯作者: Hebard, AF
TaAs 中 Weyl 节点的观察
DOI: 10.1038/nphys3426
发表时间: 2015-09-01
期刊: NATURE PHYSICS
影响因子: 19.6
作者:
Lv, B. Q.;Xu, N.;Ding, H.
通讯作者: Ding, H.
DOI: 10.1103/physrevb.54.11169
发表时间: 1996-10-15
期刊: PHYSICAL REVIEW B
影响因子: 3.7
作者:
Kresse, G;Furthmuller, J
通讯作者: Furthmuller, J
DOI: 10.1103/physrevlett.113.027603
发表时间: 2014-07-08
影响因子: 8.6
作者:
Borisenko, Sergey;Gibson, Quinn;Cava, Robert J.
通讯作者: Cava, Robert J.
DOI: 10.1016/j.cpc.2014.05.003
发表时间: 2014-08-01
影响因子: 6.3
作者:
Mostofi, Arash A.;Yates, Jonathan R.;Marzari, Nicola
通讯作者: Marzari, Nicola