Time-reversal switching responses in antiferromagnets

Abstract

We propose emergent time-reversal switching responses in antiferromagnets, which is triggered by an accompanying magnetic toroidal monopole, i.e., time-reversal odd scalar distinct from electric and magnetic monopoles. We show that simple collinear antiferromagnets exhibit unconventional responses to external electric and/or magnetic fields once magnetic symmetry accommodates the magnetic toroidal monopole. We specifically demonstrate that the emergence of the magnetic toroidal monopole in antiferromagnets enables us to control rotational distortion by an external magnetic field, switch vortex-type antiferromagnetic structure by an external electric field, and convert right/left-handedness in chirality by a composite electromagnetic field. We also present the symmetry conditions to induce the magnetic toroidal monopole and exhibit candidate materials including noncollinear antiferromagnets in order to stimulate experimental observations.

arXiv comment6 pages, 4 figures, 1 table

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Cited by in corpus (7)

• Unified description of electronic orderings and cross correlations by complete multipole representation
• Quantification of chirality based on electric toroidal monopole
• Electric field-induced nonreciprocal directional dichroism in a time-reversal-odd antiferromagnet
• Standard model of electromagnetism and chirality in crystals
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• Symmetry Rules on Multipole Interactions under Crystallographic Point Groups and Application to Multiple-$Q$ Multipole States