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Negative magnetoresistance in Weyl semimetals NbAs and NbP: Intrinsic chiral anomaly and extrinsic effects
文献类型：期刊论文
| 作者 | Yang, XJ; Li, PS ; Wang, Z; Li, YP; Lu, YH; Zheng, Y; Xu, ZA; Li PS(李鹏善); Li XD(李晓东); Li, XD
|
| 刊名 | FRONTIERS OF PHYSICS物理学前沿
 |
| 出版日期 | 2017 |
| 卷号 | 12期号:3页码:127205 |
| 关键词 | Weyl semimetals chiral anomaly negative magnetoresistance extrinsic effects |
| ISSN号 | 2095-0462 |
| DOI | 10.1007/s11467-016-0636-8 |
| 文献子类 | Review |
| 英文摘要 | Chiral anomaly-induced negative magnetoresistance (NMR) has been widely used as critical transport evidence for the existence of Weyl fermions in topological semimetals. In this mini-review, we discuss the general observation of NMR phenomena in non-centrosymmetric NbP and NbAs. We show that NMR can arise from the intrinsic chiral anomaly of Weyl fermions and/or extrinsic effects, such as the superimposition of Hall signals; field-dependent inhomogeneous current flow in the bulk, i. e., current jetting; and weak localization (WL) of coexistent trivial carriers. The WL-controlled NMR is heavily dependent on sample quality and is characterized by a pronounced crossover from positive to negative MR growth at elevated temperatures, resulting from the competition between the phase coherence time and the spin-orbital scattering constant of the bulk trivial pockets. Thus, the correlation between the NMR and the chiral anomaly need to be scrutinized without the support of complimentary techniques. Because of the lifting of spin degeneracy, the spin orientations of Weyl fermions are either parallel or antiparallel to the momentum, which is a unique physical property known as helicity. The conservation of helicity provides strong protection for the transport of Weyl fermions, which can only be effectively scattered by magnetic impurities. Chemical doping with magnetic and non-magnetic impurities is thus more convincing than the NMR method for detecting the existence of Weyl fermions. |
| WOS关键词 | FERMION SEMIMETAL ; TOPOLOGICAL INSULATORS ; WEAK ANTILOCALIZATION ; ARCS ; DISCOVERY ; GRAPHENE |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| CSCD记录号 | CSCD:6025596 |
| WOS记录号 | WOS:000394184800004 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/284775]  |
| 专题 | 高能物理研究所_理论物理室 高能物理研究所_加速器中心 高能物理研究所_多学科研究中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Yang, XJ,Li, PS,Wang, Z,et al. Negative magnetoresistance in Weyl semimetals NbAs and NbP: Intrinsic chiral anomaly and extrinsic effects[J]. FRONTIERS OF PHYSICS物理学前沿,2017,12(3):127205. |
| APA | Yang, XJ.,Li, PS.,Wang, Z.,Li, YP.,Lu, YH.,...&Shen, ZX.(2017).Negative magnetoresistance in Weyl semimetals NbAs and NbP: Intrinsic chiral anomaly and extrinsic effects.FRONTIERS OF PHYSICS物理学前沿,12(3),127205. |
| MLA | Yang, XJ,et al."Negative magnetoresistance in Weyl semimetals NbAs and NbP: Intrinsic chiral anomaly and extrinsic effects".FRONTIERS OF PHYSICS物理学前沿 12.3(2017):127205. |
入库方式： OAI收割
来源：高能物理研究所
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