Recent observations of negative longitudinal magnetoresistance in semimetal
Recent observations of negative longitudinal magnetoresistance in semimetal
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DOI：
10.1088/1674-1056/25/11/117204
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发表时间：
2016-10
影响因子：
1.7
通讯作者：
Xitong Xu;S. Jia
中科院分区：
文献类型：
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作者：
Xitong Xu;S. Jia
狄拉克半金属和魏尔半金属的发现激发了人们对研究拓扑材料中独特的磁输运性质的日益增长的热情。Weyl半金属可以承载Weyl费米子作为其低能准粒子激发，因此执行类似于高能物理中的奇异特征，例如破坏手征电荷守恒称为手征反常。手征反常的电输运特征之一是Adler-Bell-Jackiw(ABJ)反常，当磁场和电流平行时，该反常表现为负磁电阻。最近，许多实验报道了拓扑材料中的负纵磁阻，但测量结果的细节各不相同。这里对材料和相应的实验结果进行了简要的回顾。除了对ABJ异常的合理解释外，还讨论了NLMR的一些其他来源。
The discovery of Dirac semimetal and Weyl semimetal has motivated a growing passion for investigating the unique magneto-transport properties in the topological materials. A Weyl semimetal can host Weyl fermions as its low-energy quasi-particle excitations, and therefore perform exotic features analogous to those in high-energy physics, such as the violation of the chiral charge conservation known as the chiral anomaly. One of the electrical transport signatures of the chiral anomaly is the Adler–Bell–Jackiw (ABJ) anomaly which presents as a negative magnetoresistance when the magnetic field and the current are parallel. Very recently, numerous experiments reported negative longitudinal magnetoresistance (NLMR) in topological materials, but the details of the measurement results are various. Here the materials and the corresponding experiment results are briefly reviewed. Besides the plausible explanation of the ABJ anomaly, some other origins of the NLMR are also discussed.