Dresden 2020 – wissenschaftliches Programm

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AKjDPG: Arbeitskreis junge DPG

AKjDPG 2: PhD Focus Session: Symposium on SStrange Bedfellows – Magnetism Meets Superconductivity" (joint session MA/AKjDPG)

AKjDPG 2.5: Hauptvortrag

Dienstag, 17. März 2020, 11:15–11:45, HSZ 04

Majorana bound states in magnetic skyrmions — •Jelena Klinovaja — Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

Magnetic skyrmions are highly mobile nanoscale topological spin textures. A magnetic skyrmion of an even azimuthal winding number placed in proximity to an s-wave superconductor hosts a zero-energy Majorana bound state in its core, when the exchange coupling between the itinerant electrons and the skyrmion is strong [1]. This Majorana bound state is stabilized by the presence of a spin-orbit interaction. We propose the use of a superconducting tri-junction to realize non-Abelian statistics of such Majorana bound states.

Antiferromagnetic skyrmion crystals are magnetic phases predicted to exist in antiferromagnets with Dzyaloshinskii-Moriya interactions. Their spatially periodic noncollinear magnetic texture gives rise to topological bulk magnon bands characterized by nonzero Chern numbers [2,3]. We find topologically-protected chiral magnonic edge states over a wide range of magnetic fields and Dzyaloshinskii-Moriya interaction values. Edge states appear at the lowest possible energies, namely, within the first bulk magnon gap. Thus, antiferromagnetic skyrmion crystals show great promise as novel platforms for topological magnonics.

[1] G. Yang, P. Stano, J. Klinovaja, and D. Loss, Phys. Rev. B 93, 224505 (2016). [2] S. Diaz, J. Klinovaja, and D. Loss, Phys. Rev. Lett. 122, 187203 (2019). [3] S. Diaz, T. Hirosawa, J. Klinovaja, and D. Loss, arXiv:1910.05214.