Anomalous DC Hall response in noncentrosymmetric tilted Weyl semimetals Academic Article uri icon

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abstract

  • Weyl nodes come in pairs of opposite chirality. For broken time reversal symmetry (TR) they are displaced in momentum space by [Formula: see text] and the anomalous DC Hall conductivity [Formula: see text] is proportional to [Formula: see text] at charge neutrality. For finite doping there are additive corrections to [Formula: see text] which depend on the chemical potential as well as on the tilt ([Formula: see text]) of the Dirac cones and on their relative orientation. If inversion symmetry (I) is also broken the Weyl nodes are shifted in energy by an amount [Formula: see text]. This introduces further changes in [Formula: see text] and we provide simple analytic formulas for these modifications for both type I ([Formula: see text]) and type II ([Formula: see text], overtilted) Weyl. For type I when the Weyl nodes have equal magnitude but oppositely directed tilts, the correction to [Formula: see text] is proportional to the chemical potential μ and completely independent of the energy shift [Formula: see text]. When instead the tilts are parallel, the correction is linear in [Formula: see text] and μ drops out. For type II the corrections involve both μ and [Formula: see text], are nonlinear and also involve a momentum cut off. We discuss the implied changes to the Nernst coefficient and to the thermal Hall effect of a finite [Formula: see text].

publication date

  • March 21, 2018