Emergent electric fields driven by phonon-coupled skyrmion resonances
TLDR
This paper theoretically describes emergent electric fields generated by phonon-coupled skyrmion lattice dynamics under microwave excitation.
Key contributions
- Develops a theoretical model for emergent electric fields from phonon-coupled skyrmion lattice dynamics.
- Identifies conditions for rectified (dc) and oscillating (ac) electric fields, even without skyrmion translation.
- Uses measurable skyrmion parameters (radius, width, frequency) to explain macroscopic electrodynamic response.
- Provides a unified framework for phonon-driven spin-charge-lattice coupling in topological magnets.
Why it matters
This research provides a theoretical framework for understanding how skyrmion dynamics, coupled with lattice vibrations, generate electric fields. It advances the understanding of spin-charge-lattice interactions in topological magnets, potentially enabling new ways to manipulate magnetic textures for spintronic applications.
Original Abstract
We develop a coarse-grained theoretical description of the macroscopic emergent electric field generated by phonon-coupled lattice deformations in the breathing and rotational dynamics of a skyrmion lattice under microwave excitation. The analysis identifies the symmetry and dynamical conditions that yield rectified (dc) and oscillating (ac) electric fields, even in the absence of net translational motion of the skyrmion lattice, particularly in the dilute-lattice limit. Using experimentally measurable skyrmion profile parameters such as the equilibrium radius, domain-wall width, and dynamical resonance frequency of skyrmion lattice, the model further enables identification of harmonic components contributing to the observed macroscopic electrodynamic response in the long-wavelength phonon limit ($q \to 0$) and at finite phonon frequency, providing a unified framework for phonon-driven spin-charge-lattice coupling in topological magnets.
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