Experimental Tests of the Chiral Anomaly Magnetoresistance in the Dirac-Weyl Semimetals Na 3 Bi and GdPtBi
Open accessAbstract
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 Na 3 Bi 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 Na 3 Bi 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 Na 3 Bi 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 ðBÞ in Na 3 Bi decreases by a factor of 10.9 between B ¼ 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.We briefly discuss how the squeeze test may be extended to test ZrTe 5 .
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Therefore, with increasing magnetic field, the voltage drop between voltage contacts may even decrease for asymmetric point-like electrical contacts and irregular sample shape, leading to negative longitudinal MR.
“Therefore, with increasing magnetic field, the voltage drop between voltage contacts may even decrease for asymmetric point-like electrical contacts and irregular sample shape, leading to negative longitudinal MR (10,304,305).”
From Transport of Topological Semimetals (2019) · cites this paper as [304]
Section II (page unavailable) describes small current contacts that accentuate field-induced current jetting. The passage on case 1 says the edge-contact voltage decreases as the magnetic field increases, yielding a spurious negative longitudinal magnetoresistance. The paper does not establish the claim’s specific conditions of asymmetric contacts and irregular sample shape; it describes platelike samples with contacts placed along the spine and edge. (LLM, conf=0.84)
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Cites
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Transport of Topological Semimetals
Hu, J., Xu, S.-Y., Ni, N., & Mao, Z. (2019) · Annual Review of Materials Research · doi:10.1146/annurev-matsci-070218-010023 · Cited by 265 · see citing works
Self-citationLi, P., Zhang, C. H., Zhang, J. W., Wen, Y., & Zhang, X. X. (2018) · Physical Review B · doi:10.1103/physrevb.98.121108 · Cited by 101 · see citing works
- Authors
- Liang, S., Lin, J., Kushwaha, S., Xing, J., Ni, N., Cava, R. J., & Ong, N. P.
- Affiliations
- Princeton University (US)
- California NanoSystems Institute (US)
- Venue
- Physical Review X
- Publisher
- American Physical Society (APS)
- Published
- 2018-07-03
- Volume
- 8
- Issue
- 3
- ISSN
- 2160-3308 (ISSN-L)
- OpenAlex
- W2785514562
- Cited by
- 204
- References
- 5
- Citations by year
- 2026: 10 · 2025: 16 · 2024: 20 · 2023: 30 · 2022: 17 · 2021: 32 · 2020: 34 · 2019: 34 · 2018: 11
- FWCI
- 12.83
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Physical Review X (publishedVersion, cc-by)
- arXiv (Cornell University) (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Army Research Office (W911NF-16-1-0116, ARO W911NF-12-1-0461)
- Gordon and Betty Moore Foundation (GBMF4539)
- National Science Foundation (DMR 1420541)
- U.S. Department of Energy (DE-SC0011978)
- Basic Energy Sciences
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Keywords
- chiral anomaly, longitudinal magnetoresistance, Na3Bi, axial current, chiral Landau levels, Weyl points, angular magnetoresistance, intrinsic magnetoresistance, ZrTe5, topological semimetals
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