How a skyrmion can appear both massive and massless
arXiv:2201.08519 · doi:10.21468/SciPostPhys.12.5.159
Abstract
When a magnetic skyrmion is modeled as a point particle, its dynamics depends on the precise definition of the skyrmion center. The guiding-center position, defined as the first moment of the skyrmion density, exhibits Thiele's massless dynamics; position based on the first moment of magnetization component shows Larmor oscillations characteristic of a massive particle. We show that, even with the latter definition, the Larmor oscillations may be absent for certain types of external forces such as adiabatic spin torque. We offer an alternative mechanical model of a skyrmion featuring two coupled massless particles.
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- Anisotropic skyrmion mass induced by surrounding conduction electrons: A Schwinger-Keldysh field theory approach
- Topological dipoles of quantum skyrmions
- Skyrmion Lattice Domain Formation in a Non-Flat Energy Landscape
- Controllable and Non-Dissipative Inertial Dynamics of Skyrmion in a Bosonic Platform