Seminarium "Coherence-Correlations-Complexity" (KFT, PWr)
Platforma Zoom
Nonequilibrium Skyrmion Dynamics
dr Christina Psaroudaki
Department of Physics, University of Basel
The seminar will be broadcast on the Zoom platform (the link will be made available to interested persons after prior contact at ).
Abstract:
In this talk, I discuss several aspects on the nonequilibrium skyrmion dynamics under time-periodic magnetic fields in chiral magnetic insulators. The unavoidable coupling of the external field to the surrounding magnons gives rise to a new type of time-dependent dissipation for the skyrmion, with measurable consequences on the skyrmion path. These ac fields act as a net driving force on the skyrmion via its own intrinsic magnetic excitations [1]. In addition, we generalize the standard quantum theory of dissipation to include the stochastic effects of the driven bath on the skyrmion dynamics, and provide a generalized version of the nonequilibrium fluctuation-dissipation relation for externally weakly - driven reservoirs [2]. Finally, we propose a novel platform for the generation of spin waves with controlled characteristics based on an ac-driven skyrmion-antiskyrmion bilayer which forms a topological charge dipole and emits spin waves with characteristic dipole signatures [3].
[1]. C. P. et al., Phys. Rev. X 7, 041045 (2017); C. P. and D. Loss, Phys. Rev. Lett. 120, 237203 (2018). [2] C. P. et al., Phys. Rev. B 100, 134404 (2019). [3] S. A. Díaz, T. Hirosawa, D. Loss, and C. P., Nano Lett., 20, 6556 (2020).
