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Title: Chiral edge currents for ac-driven skyrmions in confined pinning geometries

Abstract

In this work, we show that ac-driven skyrmion lattices in a weak pinning channel confined by regions of strong pinning exhibit edge transport carried by skipping orbits while skyrmions in the bulk of the channel undergo localized orbits with no net transport. The magnitude of the edge currents can be controlled by varying the amplitude and frequency of the ac drive or by changing the ratio of the Magnus force to the damping term. We identify a localized phase in which the orbits are small and edge transport is absent, an edge transport regime, and a fluctuating regime that appears when the ac drive is strong enough to dynamically disorder the skyrmion lattice. We also find that in some cases, multiple rows of skyrmions participate in the transport due to a drag effect from the skyrmion-skyrmion interactions. The edge currents are robust for finite disorder and should be a general feature of skyrmions interacting with confined geometries or inhomogeneous disorder under an ac drive. We show that similar effects can occur for skyrmion lattices at interfaces or along domain boundaries for multiple coexisting skyrmion species. The edge current effect provides a new method to control skyrmion motion, and we discussmore » the connection of these results with recent studies on the emergence of edge currents in chiral active matter systems and gyroscopic metamaterials.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1798117
Report Number(s):
LA-UR-19-29754
Journal ID: ISSN 2469-9950; TRN: US2210650
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science

Citation Formats

Reichhardt, Charles, and Reichhardt, Cynthia Jane O. Chiral edge currents for ac-driven skyrmions in confined pinning geometries. United States: N. p., 2019. Web. doi:10.1103/physrevb.100.174414.
Reichhardt, Charles, & Reichhardt, Cynthia Jane O. Chiral edge currents for ac-driven skyrmions in confined pinning geometries. United States. https://doi.org/10.1103/physrevb.100.174414
Reichhardt, Charles, and Reichhardt, Cynthia Jane O. Mon . "Chiral edge currents for ac-driven skyrmions in confined pinning geometries". United States. https://doi.org/10.1103/physrevb.100.174414. https://www.osti.gov/servlets/purl/1798117.
@article{osti_1798117,
title = {Chiral edge currents for ac-driven skyrmions in confined pinning geometries},
author = {Reichhardt, Charles and Reichhardt, Cynthia Jane O.},
abstractNote = {In this work, we show that ac-driven skyrmion lattices in a weak pinning channel confined by regions of strong pinning exhibit edge transport carried by skipping orbits while skyrmions in the bulk of the channel undergo localized orbits with no net transport. The magnitude of the edge currents can be controlled by varying the amplitude and frequency of the ac drive or by changing the ratio of the Magnus force to the damping term. We identify a localized phase in which the orbits are small and edge transport is absent, an edge transport regime, and a fluctuating regime that appears when the ac drive is strong enough to dynamically disorder the skyrmion lattice. We also find that in some cases, multiple rows of skyrmions participate in the transport due to a drag effect from the skyrmion-skyrmion interactions. The edge currents are robust for finite disorder and should be a general feature of skyrmions interacting with confined geometries or inhomogeneous disorder under an ac drive. We show that similar effects can occur for skyrmion lattices at interfaces or along domain boundaries for multiple coexisting skyrmion species. The edge current effect provides a new method to control skyrmion motion, and we discuss the connection of these results with recent studies on the emergence of edge currents in chiral active matter systems and gyroscopic metamaterials.},
doi = {10.1103/physrevb.100.174414},
journal = {Physical Review B},
number = 17,
volume = 100,
place = {United States},
year = {Mon Nov 11 00:00:00 EST 2019},
month = {Mon Nov 11 00:00:00 EST 2019}
}

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