中国物理B ›› 2016, Vol. 25 ›› Issue (11): 117204-117204.doi: 10.1088/1674-1056/25/11/117204

所属专题: TOPICAL REVIEW — Topological electronic states

• TOPICAL REVIEW—Topological electronic states • 上一篇    下一篇

Recent observations of negative longitudinal magnetoresistance in semimetal

Xi-Tong Xu(许锡童), Shuang Jia(贾爽)   

  1. 1 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;
    2 Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
  • 收稿日期:2016-07-12 修回日期:2016-10-14 出版日期:2016-11-05 发布日期:2016-11-05
  • 通讯作者: Shuang Jia E-mail:gwljiashuang@pku.edu.cn
  • 基金资助:

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

Recent observations of negative longitudinal magnetoresistance in semimetal

Xi-Tong Xu(许锡童)1, Shuang Jia(贾爽)1,2   

  1. 1 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;
    2 Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
  • Received:2016-07-12 Revised:2016-10-14 Online:2016-11-05 Published:2016-11-05
  • Contact: Shuang Jia E-mail:gwljiashuang@pku.edu.cn
  • Supported by:

    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.

关键词: chiral anomaly, magnetoresistance, Weyl semimetal, Dirac semimetal

Abstract:

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.

Key words: chiral anomaly, magnetoresistance, Weyl semimetal, Dirac semimetal

中图分类号:  (Other topics in electronic transport in condensed matter)

  • 72.90.+y
72.10.-d (Theory of electronic transport; scattering mechanisms) 72.15.Qm (Scattering mechanisms and Kondo effect) 75.47.-m (Magnetotransport phenomena; materials for magnetotransport)