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	Negative magnetoresistance in weyl semimetals nbas and nbp: intrinsic chiral anomaly and extrinsic effects
	Li, Yupeng1; Wang, Zhen1,2; Li, Pengshan3; Yang, Xiaojun1,2; Shen, Zhixuan1; Sheng, Feng1; Li, Xiaodong3; Lu, Yunhao2; Zheng, Yi1,4,5; Xu, Zhu-An1,2,4,5
刊名	Frontiers of physics
	2017-06-01
卷号	12期号:3页码:10
关键词	Weyl semimetals Chiral anomaly Negative magnetoresistance Extrinsic effects
ISSN号	2095-0462
DOI	10.1007/s11467-016-0636-8
通讯作者	Zheng, yi(phyzhengyi@zju.edu.cn) ; Xu, zhu-an(zhuan@zju.edu.cn)
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
WOS类目	Physics, Multidisciplinary
语种	英语
出版者	HIGHER EDUCATION PRESS
WOS记录号	WOS:000394184800004
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2176812
专题	高能物理研究所
通讯作者	Zheng, Yi; Xu, Zhu-An
作者单位	1.Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China 2.Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China 3.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China 4.Zhejiang Univ, Zhejiang Calif Int NanoSyst Inst, Hangzhou 310058, Zhejiang, Peoples R China 5.Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Li, Yupeng,Wang, Zhen,Li, Pengshan,et al. Negative magnetoresistance in weyl semimetals nbas and nbp: intrinsic chiral anomaly and extrinsic effects[J]. Frontiers of physics,2017,12(3):10.
APA	Li, Yupeng.,Wang, Zhen.,Li, Pengshan.,Yang, Xiaojun.,Shen, Zhixuan.,...&Xu, Zhu-An.(2017).Negative magnetoresistance in weyl semimetals nbas and nbp: intrinsic chiral anomaly and extrinsic effects.Frontiers of physics,12(3),10.
MLA	Li, Yupeng,et al."Negative magnetoresistance in weyl semimetals nbas and nbp: intrinsic chiral anomaly and extrinsic effects".Frontiers of physics 12.3(2017):10.

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