Negative Magnetoresistance without Chiral Anomaly in Topological Insulators

Dai, Xin1; Du, Z. Z.2,3,4,5; Lu, Hai-Zhou2,3,5

2017-10-18

10.1103/PhysRevLett.119.166601

PHYSICAL REVIEW LETTERS   影响因子和分区

0031-9007

1079-7114

An intriguing phenomenon in topological semimetals and topological insulators is the negative magnetoresistance (MR) observed when a magnetic field is applied along the current direction. A prevailing understanding to the negative MR in topological semimetals is the chiral anomaly, which, however, is not well defined in topological insulators. We calculate the MR of a three-dimensional topological insulator, by using the semiclassical equations of motion, in which the Berry curvature explicitly induces an anomalous velocity and orbital moment. Our theoretical results are in quantitative agreement with the experiments. The negative MR is not sensitive to temperature and increases as the Fermi energy approaches the band edge. The orbital moment and g factors also play important roles in the negative MR. Our results give a reasonable explanation to the negative MR in 3D topological insulators and will be helpful in understanding the anomalous quantum transport in topological states of matter.

SCI ; EI

英语

NI论文

通讯

Science, Technology and Innovation Commission of Shenzhen Municipality[ZDSYS20170303165926217]

Physics

Physics, Multidisciplinary

WOS:000413170700008

AMER PHYSICAL SOC

20174304306137

Electric insulators ; Equations of motion ; Magnetoresistance ; Quantum chemistry ; Quantum electronics

Magnetism: Basic Concepts and Phenomena:701.2 ; Physical Chemistry:801.4 ; Calculus:921.2 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Quantum Theory; Quantum Mechanics:931.4

PHYSICS

Web of Science

1.Tsinghua Univ, Inst Adv Study, Beijing 100084, Peoples R China
2.South Univ Sci & Technol China, Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
3.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
4.Southeast Univ, Sch Phys, Nanjing 211189, Jiangsu, Peoples R China
5.Shenzhen Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China

Dai, Xin,Du, Z. Z.,Lu, Hai-Zhou. Negative Magnetoresistance without Chiral Anomaly in Topological Insulators[J]. PHYSICAL REVIEW LETTERS,2017,119(16).

Dai, Xin,Du, Z. Z.,&Lu, Hai-Zhou.(2017).Negative Magnetoresistance without Chiral Anomaly in Topological Insulators.PHYSICAL REVIEW LETTERS,119(16).

Dai, Xin,et al."Negative Magnetoresistance without Chiral Anomaly in Topological Insulators".PHYSICAL REVIEW LETTERS 119.16(2017).