Directed Motion of Liquid Crystal Skyrmions With Oscillating Fields
arXiv:2112.04562 · doi:10.1088/1367-2630/ac58b8
Abstract
Using continuum simulations, we show that under a sinusoidal electric field, liquid crystal skyrmions undergo periodic shape oscillations which produce controlled directed motion. The speed of the skyrmion is non-monotonic in the frequency of the applied field, and exhibits multiple reversals of the motion as a function of changing frequency. We map out the dynamical regime diagram of the forward and reverse motion for two superimposed ac driving frequencies, and show that the reversals and directed motion can occur even when only a single ac driving frequency is present. Using pulsed ac driving, we demonstrate that the motion arises due to an asymmetry in the relaxation times of the skyrmion shape. We discuss the connection between our results and ratchet effects observed in systems without asymmetric substrates.
10 pages, 6 figures
References in corpus (8)
- Spontaneous Skyrmion Ground States in Magnetic Metals
- Two-dimensional skyrmions and other solitonic structures in confinement-frustrated chiral nematics
- Reversible Vortex Ratchet Effects and Ordering in Superconductors with Simple Asymmetric Potential Arrays
- Schools of skyrmions with electrically tunable elastic interactions
- Skyrmion ratchet propagation: Utilizing the skyrmion Hall effect in AC racetrack storage devices
- Reversible Vector Ratchets for Skyrmion Systems
- Skyrmion Ratchet in Funnel Geometries
- Topological states in chiral active matter: dynamic blue phases and active half-skyrmions