Topological electric driving of magnetization dynamics in insulators

Abstract

Established forms of electromagnetic coupling are usually conservative (in insulators) or dissipative (in metals and semiconductors). Here we point out the possibility of nondissipative electric driving of magnetization dynamics, if the valence electronic states have nontrivial topology in the combined space of crystal momentum and magnetization configuration. We provide a hybrid insulator system to demonstrate that the topology-based nonconservative electrical generalized force is capable of supporting sustained magnetization motion in the presence of Gilbert damping, with quantized and steady energy pumping into magnetization motion from the electric field. We also generalize our results to magnetic textures, and discuss electric field induced Dzyaloshinskii-Moriya interaction which can be nonconservative.

arXiv comment5 pages 4 figures; revised version with more references that are aware of by us only recently

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• A dynamical model for Brownian molecular motors driven by inelastic electron tunneling
• Néel Spin-Orbit Torque in Antiferromagnetic Quantum Spin and Anomalous Hall Insulators
• Quantum transport phenomena induced by time-dependent fields
• Tailoring Corner States and Exceptional Points in Altermagnets
• Thermal Responses of Spin Density and Spin Current Induced by Bogoliubov Fermi Surfaces in Proximity Superconductors
• Topological Spin-Orbit Torque in Ferrimagnetic Weyl Semimetal
• Finite-frequency admittance and noise of a helical edge coupled to a magnet