Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 34: Skyrmions II (joint session MA/TT)

MA 34.4: Talk

Wednesday, March 18, 2020, 10:30–10:45, POT 6

Quantum Damping of Characteristic Skyrmion Eigenmodes due to Spontaneous Magnon Decay — •Alexander Mook, Jelena Klinovaja, and Daniel Loss — Department of Physics, University of Basel, CH-4056 Basel

The three characteristic and magnetically active modes of skyrmion crystals, i.e., the anticlockwise, breathing, and clockwise mode [1], are experimental probes that reveal information on the stability and behavior of the topologically nontrivial magnetic texture.

Herein, we show that the combination of a noncollinear texture and lowly dispersive Landau-level-like nature of magnon bands in skyrmion crystals installs strong three-particle interactions. These lead to spontaneously decaying magnons, i.e., to an intrinsic zero-temperature quantum damping, which manifests as lifetime broadening of the quasiparticle peak in the spectral function.

By varying the external magnetic field the characteristic modes can be brought “in resonance” with a flat mode, strongly enhancing their damping. This finding establishes skyrmion crystals as a platform to study the quantum mechanical phenomenon of spontaneous quasiparticle decay.

[1] M. Mochizuki, Phys. Rev. Lett. 108, 017601 (2012)