Evidence for the chiral anomaly in the Dirac semimetal Na₃Bi

Jun Xiong¹, Satya K Kushwaha², Tian Liang¹, Jason W Krizan², Max Hirschberger¹, Wudi Wang¹, R J Cava², N P Ong³

Affiliations

¹ Department of Physics, Princeton University, Princeton, NJ 08544, USA.
² Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
³ Department of Physics, Princeton University, Princeton, NJ 08544, USA. npo@princeton.edu.

PMID: 26338798
DOI: 10.1126/science.aac6089

Evidence for the chiral anomaly in the Dirac semimetal Na₃Bi

Jun Xiong et al. Science. 2015.

. 2015 Oct 23;350(6259):413-6.

doi: 10.1126/science.aac6089. Epub 2015 Sep 3.

Authors

Jun Xiong¹, Satya K Kushwaha², Tian Liang¹, Jason W Krizan², Max Hirschberger¹, Wudi Wang¹, R J Cava², N P Ong³

Affiliations

¹ Department of Physics, Princeton University, Princeton, NJ 08544, USA.
² Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
³ Department of Physics, Princeton University, Princeton, NJ 08544, USA. npo@princeton.edu.

PMID: 26338798
DOI: 10.1126/science.aac6089

Abstract

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: || 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.

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Comment in

PHYSICS. Chiral anomaly without relativity.
Burkov A. Burkov A. Science. 2015 Oct 23;350(6259):378-9. doi: 10.1126/science.aad2713. Science. 2015. PMID: 26494743 No abstract available.

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Evidence for the chiral anomaly in the Dirac semimetal Na₃Bi

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Evidence for the chiral anomaly in the Dirac semimetal Na₃Bi

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