Evidence for the chiral anomaly in the Dirac semimetal Na3Bi

Jun Xiong, Satya K. Kushwaha, Tian Liang, Jason W. Krizan, Max Hirschberger, Wudi Wang, R. J. Cava, N. P. Ong

Research output: Contribution to journalArticle

540 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)413-416
Number of pages4
JournalScience
Volume350
Issue number6259
DOIs
StatePublished - Oct 23 2015

All Science Journal Classification (ASJC) codes

  • General

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    Xiong, J., Kushwaha, S. K., Liang, T., Krizan, J. W., Hirschberger, M., Wang, W., Cava, R. J., & Ong, N. P. (2015). Evidence for the chiral anomaly in the Dirac semimetal Na3Bi. Science, 350(6259), 413-416. https://doi.org/10.1126/science.aac6089