Localized charge in various configurations of magnetic domain wall in Weyl semimetal

Abstract

We numerically investigate the electronic properties of magnetic domain walls formed in a Weyl semimetal. Electric charge distribution is computed from the electron wave functions, by numerically diagonalizing the Hamiltonian under several types of domain walls. We find a certain amount of electric charge localized around the domain wall, depending on the texture of the domain wall. This localized charge stems from the degeneracy of Landau states under the axial magnetic field, which corresponds to the curl in the magnetic texture. The localized charge enables one to drive the domain wall motion by applying an external electric field without injecting an electric current, which is distinct from the ordinary spin-transfer torque and is free from Joule heating.

arXiv comment10 pages, 8 figures

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• Theory for spin torque in Weyl semimetal with magnetic texture
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• Domain wall skew scattering in ferromagnetic Weyl metals
• Intrinsic insulating transport characteristics in low-carrier density EuCd2As2 films
• Effective model analysis of intrinsic spin Hall effect with magnetism in stacked-kagome Weyl semimetal Co3Sn2S2
• Nodal lines and boundary modes in topological Dirac semimetals with magnetism
• Directional field-dependence of tunable magnetic domains in noncentrosymmetric ferromagnetic Weyl semimetal CeAlSi
• Flat bands and multi-state memory devices from chiral domain wall superlattices in magnetic Weyl semimetals
• Light-induced pseudo-magnetic fields in three-dimensional topological semimetals
• Probing domain wall dynamics in magnetic Weyl semimetals via the non-linear anomalous Hall effect
• Fermi arcs around magnetic domain walls in a compensated ferrimagnetic Weyl semimetal Ti${}_2$MnAl