Magnonic Quadrupole Topological Insulator in Antiskyrmion Crystals

Hirosawa, Tomoki and Díaz, Sebastián A. and Klinovaja, Jelena and Loss, Daniel. (2020) Magnonic Quadrupole Topological Insulator in Antiskyrmion Crystals. Physical Review Letters, 125 (20). p. 207204.

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Official URL: https://edoc.unibas.ch/80679/

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We uncover that antiskyrmion crystals provide an experimentally accessible platform to realize a magnonic quadrupole topological insulator, whose hallmark signatures are robust magnonic corner states. Furthermore, we show that tuning an applied magnetic field can trigger the self-assembly of antiskyrmions carrying a fractional topological charge along the sample edges. Crucially, these fractional antiskyrmions restore the symmetries needed to enforce the emergence of the magnonic corner states. Using the machinery of nested Wilson loops, adapted to magnonic systems supported by noncollinear magnetic textures, we demonstrate the quantization of the bulk quadrupole moment, edge dipole moments, and corner charges.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Klinovaja, Jelena
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Apr 2022 14:24
Deposited On:20 Apr 2021 15:43

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