TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.12.5.159
TI  - How a skyrmion can appear both massive and massless
PY  - 2022/05/12
UR  - https://scipost.org/SciPostPhys.12.5.159
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 12
IS  - 5
SP  - 159
A1  - Wu, Xiaofan
AU  - Tchernyshyov, Oleg
AB  - 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 $m_z$ 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.
ER  -

@Article{10.21468/SciPostPhys.12.5.159,
	title={{How a skyrmion can appear both massive and massless}},
	author={Xiaofan Wu and Oleg Tchernyshyov},
	journal={SciPost Phys.},
	volume={12},
	pages={159},
	year={2022},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.12.5.159},
	url={https://scipost.org/10.21468/SciPostPhys.12.5.159},
}