Emergence of inductance and capacitance from topological electromagnetism

Abstract

Topological electromagnetism owing to nontrivial momentum-space topology of electrons in insulators gives rise to diverse anomalous magnetoelectric responses. While conventional inductors and capacitors are based on classical electromagnetism described by Maxwell's equations, here we show that topological electromagnetism in combination with spin dynamics in magnets also generates an inductance or a capacitance. We build a generic framework to extract the complex impedance on the basis of topological field theory, and demonstrate the emergence of an inductance or a capacitance in several heterostructure setups. In comparison with the previously-studied emergent inductances in metallic magnets, insulators highly suppress the power loss, because of the absence of Joule heating. We show that the inductance from topological electromagnetism is achieved at low current and high frequency, and is also advantageous in its power efficiency, as characterized by the high quality factor (Q-factor).

arXiv comment9 pages, 4 figures + Supplemental Information (4 pages)

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Cited by in corpus (4)

• Emergent inductors in non-helical magnets
• Emergent electric field induced by dissipative sliding dynamics of domain walls in a Weyl magnet
• Unraveling the dynamics of magnetization in topological insulator-ferromagnet heterostructures via spin-orbit torque
• Emergent impedance due to antiferromagnetic domain wall dynamics