Negative magnetoresistance in Weyl semimetals NbAs and NbP: Intrinsic chiral anomaly and extrinsic effects

doi:10.1007/s11467-016-0636-8

	Negative magnetoresistance in Weyl semimetals NbAs and NbP: Intrinsic chiral anomaly and extrinsic effects
	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
	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
内容类型	期刊论文
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.