Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 38: Focus Session: Magnon Polarons – Magnon-Phonon Coupling and Spin Transport (joint session MA/HL)

HL 38.1: Hauptvortrag

Mittwoch, 18. März 2020, 09:30–10:00, HSZ 04

Magnon-polaron transport in magnetic insulators — •Benedetta Flebus — University of Texas at Austin, Austin, USA

In this talk, I will introduce the anomalous features in the magnetic field and temperature dependence of the spin Seebeck effect observed by Kikkawa et al. [PRL 117, 207203 (2016)] and explain how they can be interpreted as a signature of magnon-polaron transport.

Specifically, I will discuss how magnetoelastic coupling between magnetic moments and lattice vibrations in ferromagnets can gives rise to magnon-polarons, i.e., hybridized magnon and phonon modes. I will derive a Boltzmann transport theory for the mixed magnon-phonon modes and show that magnon-polaron formation can lead to transport anomalies when the disorder scattering in the magnetic and elastic subsystems is sufficiently different.