Scattering theory of the chiral magnetic effect in a Weyl semimetal: Interplay of bulk Weyl cones and surface Fermi arcs release_xbrvs2mutnf7lb7xx76hi2k7uy

by P. Baireuther, J. A. Hutasoit, J. Tworzydło, C. W. J. Beenakker

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(2015)

Abstract

We formulate a linear response theory of the chiral magnetic effect in a finite Weyl semimetal, expressing the electrical current density j induced by a slowly oscillating magnetic field B or chiral chemical potential μ in terms of the scattering matrix of Weyl fermions at the Fermi level. Surface conduction can be neglected in the infinite-system limit for δ j/δμ, but not for δ j/δ B: The chirally circulating surface Fermi arcs give a comparable contribution to the bulk Weyl cones no matter how large the system is, because their smaller number is compensated by an increased flux sensitivity. The Fermi arc contribution to μ^-1δ j/δ B has the universal value (e/h)^2, protected by chirality against impurity scattering --- unlike the bulk contribution of opposite sign.
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Type  article
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Date   2015-12-10
Version   v2
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arXiv  1512.02144v2
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