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- W1529523263 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." @default.
- W1529523263 created "2016-06-24" @default.
- W1529523263 creator A5044792255 @default.
- W1529523263 date "2015-06-29" @default.
- W1529523263 modified "2023-09-29" @default.
- W1529523263 title "Negative longitudinal magnetoresistance in Dirac and Weyl metals" @default.
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- W1529523263 doi "https://doi.org/10.1103/physrevb.91.245157" @default.
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