Axial Current driven by Magnetization Dynamics in Weyl Semimetals

Abstract

We theoretically study the axial current ${\mathbf{j}}_5$ (defined as the difference between the charge current with opposite chirality) in doped Weyl semimetal using a Green's function technique. We show that the axial current is controlled by the magnetization dynamics in a magnetic insulator attached to a Weyl semimetal. We find that the induced axial current can be detected by using ferromagnetic resonance or the inverse spin Hall effect and can be converted into charge current with no accompanying energy loss. These properties make Weyl semimetal advantageous for application to low-consumption electronics with new functionality.

5 pages, 3 figures

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• Chiral Magnetic Effect and Three-point Function from AdS/CFT Correspondence
• Unconventional Spin Hall Effect and Axial Current Generation in a Dirac Semimetal
• The noncommutativity of the static and homogeneous limit of the axial chemical potential in chiral magnetic effect
• Microscopic theory of electrically induced spin torques in magnetic Weyl semimetals