Evidence for the chiral anomaly in the Dirac semimetal Na3Bi

被引：984

作者：

Xiong, Jun ^{[1
]}

Kushwaha, Satya K. ^{[2
]}

Liang, Tian ^{[1
]}

Krizan, Jason W. ^{[2
]}

Hirschberger, Max ^{[1
]}

Wang, Wudi ^{[1
]}

Cava, R. J. ^{[2
]}

Ong, N. P. ^{[1
]}

机构：

[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

SCIENCE | 2015年 / 350卷 / 6259期

关键词：

MAGNETORESISTANCE; CD3AS2;

D O I：

10.1126/science.aac6089

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In a Dirac semimetal, each Dirac node is resolved into two Weyl nodes with opposite "handedness" or chirality. The two chiral populations do not mix. However, in parallel electric and magnetic fields (E parallel to B), charge is predicted to flow between the Weyl nodes, leading to negative magnetoresistance. This "axial" current is the chiral (Adler-Bell-Jackiw) anomaly investigated in quantum field theory. We report the observation of a large, negative longitudinal magnetoresistance in the Dirac semimetal Na3Bi. The negative magnetoresistance is acutely sensitive to deviations of the direction of B from E and is incompatible with conventional transport. By rotating E (as well as B), we show that it is consistent with the prediction of the chiral anomaly.

引用

页码：413 / 416

页数：4

共 23 条

[1] AXIAL-VECTOR VERTEX IN SPINOR ELECTRODYNAMICS [J].