Experimental Tests of the Chiral Anomaly Magnetoresistance in the Dirac-Weyl Semimetals Na 3 Bi and GdPtBi

Liang, Sihang; Lin, Jingjing; Kushwaha, Satya; Xing, Jie; Ni, Ni; Cava, R. J.; Ong, N. P.

doi:10.1103/PhysRevX.8.031002

Title: Experimental Tests of the Chiral Anomaly Magnetoresistance in the Dirac-Weyl Semimetals ${Na}_{3} Bi$ and GdPtBi

Journal Article · Tue Jul 03 00:00:00 EDT 2018 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.8.031002· OSTI ID:1458790

Liang, Sihang; Lin, Jingjing; Kushwaha, Satya; Xing, Jie; Ni, Ni; Cava, R. J.; Ong, N. P.

In the Dirac-Weyl semimetal, the chiral anomaly appears as an “axial” current arising from charge pumping between the lowest (chiral) Landau levels of the Weyl nodes, when an electric field is applied parallel to a magnetic field B . Evidence for the chiral anomaly was obtained from the longitudinal magnetoresistance (LMR) in Na₃Bi and GdPtBi. However, current-jetting effects (focusing of the current density J) have raised general concerns about LMR experiments. Here, we implement a litmus test that allows the intrinsic LMR in Na₃Bi and GdPtBi to be sharply distinguished from pure current-jetting effects (in pure Bi). Current jetting enhances J along the mid-line (spine) of the sample while decreasing it at the edge. We measure the distortion by comparing the local voltage drop at the spine (expressed as the resistance R_spine) with that at the edge (R_edge). In Bi, R spine sharply increases with B, but R_edge decreases (jetting effects are dominant). However, in Na₃Bi and GdPtBi, both R_spine and R_edge decrease (jetting effects are subdominant). A numerical simulation allows the jetting distortions to be removed entirely. We find that the intrinsic longitudinal resistivity ρ_xx(B) in Na₃Bi decreases by a factor of 10.9 between B = 0 and 10 T. A second litmus test is obtained from the parametric plot of the planar angular magnetoresistance. These results considerably strengthen the evidence for the intrinsic nature of the chiral-anomaly-induced LMR. As a result we briefly discuss how the squeeze test may be extended to test ZrTe₅.

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Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0011978

OSTI ID:: 1458790

Alternate ID(s):: OSTI ID: 1498998

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 8 Journal Issue: 3; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 142 works

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