Recent observations of negative longitudinal magnetoresistance in semimetal  

作　　者：许锡童 贾爽 

机构地区：[1]International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China [2]Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

出　　处：《Chinese Physics B》2016年第11期34-40,共7页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant Nos.2013CB921901 and 2014CB239302)

摘　　要：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.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.

关 键 词：topological longitudinal chiral magneto anomaly explanation details analogous anisotropy crystalline 

分 类 号：O469[理学—凝聚态物理]