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Publicação:
Skyrmion dynamics and topological sorting on periodic obstacle arrays

dc.contributor.authorVizarim, N. P. [UNESP]
dc.contributor.authorReichhardt, C.
dc.contributor.authorReichhardt, C. J.O.
dc.contributor.authorVenegas, P. A. [UNESP]
dc.contributor.institutionLos Alamos National Laboratory
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2020-12-12T01:25:19Z
dc.date.available2020-12-12T01:25:19Z
dc.date.issued2020-05-01
dc.description.abstractWe examine skyrmions under a dc drive interacting with a square array of obstacles for varied obstacle size and damping. When the drive is applied in a fixed direction, we find that the skyrmions are initially guided in the drive direction but also move transverse to the drive due to the Magnus force. The skyrmion Hall angle, which indicates the difference between the skyrmion direction of motion and the drive direction, increases with drive in a series of quantized steps as a result of the locking of the skyrmion motion to specific symmetry directions of the obstacle array. On these steps, the skyrmions collide with an integer number of obstacles to create a periodic motion. The transitions between the different locking steps are associated with jumps or dips in the velocity-force curves. In some regimes, the skyrmion Hall angle is actually higher than the intrinsic skyrmion Hall angle that would appear in the absence of obstacles. In the limit of zero damping, the skyrmion Hall angle is 90°, and we find that it decreases as the damping increases. For multiple interacting skyrmion species in the collective regime, we find jammed behavior at low drives where the different skyrmion species are strongly coupled and move in the same direction. As the drive increases, the species decouple and each can lock to a different symmetry direction of the obstacle lattice, making it possible to perform topological sorting in analogy to the particle sorting methods used to fractionate different species of colloidal particles moving over two-dimensional obstacle arrays.en
dc.description.affiliationTheoretical Division and Center for Nonlinear Studies Los Alamos National Laboratory
dc.description.affiliationPOSMAT - Programa de Pós-Graduacao em Ciencia e Tecnologia de Materiais Faculdade de Ciencias Universidade Estadual Paulista - UNESP, SP, CP 473
dc.description.affiliationDepartamento de Física Faculdade de Ciencias Universidade Estadual Paulista - UNESP, SP, CP 473
dc.description.affiliationUnespPOSMAT - Programa de Pós-Graduacao em Ciencia e Tecnologia de Materiais Faculdade de Ciencias Universidade Estadual Paulista - UNESP, SP, CP 473
dc.description.affiliationUnespDepartamento de Física Faculdade de Ciencias Universidade Estadual Paulista - UNESP, SP, CP 473
dc.identifierhttp://dx.doi.org/10.1088/1367-2630/ab8045
dc.identifier.citationNew Journal of Physics, v. 22, n. 5, 2020.
dc.identifier.doi10.1088/1367-2630/ab8045
dc.identifier.issn1367-2630
dc.identifier.scopus2-s2.0-85085686422
dc.identifier.urihttp://hdl.handle.net/11449/198912
dc.language.isoeng
dc.relation.ispartofNew Journal of Physics
dc.sourceScopus
dc.subjectdirectional locking
dc.subjectperiodic substrate
dc.subjectphase locking
dc.subjectskyrmion
dc.titleSkyrmion dynamics and topological sorting on periodic obstacle arraysen
dc.typeArtigopt
dspace.entity.typePublication
unesp.author.orcid0000-0002-2735-615X 0000-0002-2735-615X[1]
unesp.author.orcid0000-0002-3487-5089[3]
unesp.campusUniversidade Estadual Paulista (UNESP), Faculdade de Ciências, Baurupt

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