Cited by 204Topological Materials and PhenomenaAdvanced Condensed Matter PhysicsPhysics of Superconductivity and Magnetism

Negative longitudinal magnetoresistance in Dirac and Weyl metals

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Burkov, A. A.·2015·Physical Review B

Abstract

It has recently been found that Dirac and Weyl metals are characterized by an unusual weak-field longitudinal magnetoresistance: large, negative, and quadratic in the magnetic field. This has been shown to arise from the chiral anomaly, i.e., nonconservation of the chiral charge in the presence of external electric and magnetic fields, oriented collinearly. In this paper we report on a theory of this effect in both Dirac and Weyl metals. We demonstrate that this phenomenon contains two important ingredients. One is the magnetic-field-induced coupling between the chiral and the total (or vector, in relativistic field theory terminology) charge densities. This arises from the Berry curvature and is present in principle whenever the Berry curvature is nonzero, i.e., is nonspecific to Dirac and Weyl metals. This coupling, however, leads to a large negative quadratic magnetoresistance only when the second ingredient is present, namely when the chiral charge density is a nearly conserved quantity with a long relaxation time. This property is specific to Dirac and Weyl metals and is realized only when the Fermi energy is close to Dirac or Weyl nodes, expressing an important low-energy property of these materials, emergent chiral symmetry.

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Crossref · 10.1103/physrevb.91.245157

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4 of 4 references verified0 citation errors · 0 not checkable

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  • A nonzero E·B can pump charges from one Weyl cone to the other, leading to an imbalance of quasi-particle number of Weyl cones with opposite chiralities.

    “The charge-pumping effect means that a nonzero E·B can pump charges from one Weyl cone to the other, leading to an imbalance of the quasi-particle number of the Weyl cones with the opposite chiralities.”
  • The observed negative LMR is most likely attributed to Weyl nodes.

    “The observed negative LMR is most likely to be attributed to Weyl nodes, in accordance with the theoretical analysis of (refs 24, 26 and 36).”

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Authors
Burkov, A. A.
Affiliations
University of Waterloo (CA)
Corresponding author
Burkov, A. A.
Venue
Physical Review B
Published
2015-06-29
Volume
91
Issue
24
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
OpenAlex
W1529523263
Cited by
204
References
4
Citations by year
2026: 10 · 2025: 9 · 2024: 11 · 2023: 18 · 2022: 12 · 2021: 14 · 2020: 20 · 2019: 28 · 2018: 25 · 2017: 29 · 2016: 22 · 2015: 6
FWCI
13.89
Type
journal article
Language
en
Open access
Locations
  • Physical Review B (publishedVersion)
  • arXiv (Cornell University) (publishedVersion)
  • arXiv (Cornell University)
Funders
Natural Sciences and Engineering Research Council of Canada
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
Keywords
negative longitudinal magnetoresistance, Weyl metals, chiral anomaly, Berry curvature, Dirac nodes, Fermi energy

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