Sum-frequency excitation of coherent magnons

Dominik M. Juraschek, Derek S. Wang, Prineha Narang

Research output: Contribution to journalArticlepeer-review

Abstract

Coherent excitation of magnons is conventionally achieved through Raman scattering processes, in which the difference-frequency components of the driving field are resonant with the magnon energy. Here, we describe mechanisms by which the sum-frequency components of the driving field can be used to coherently excite magnons through two-particle absorption processes. We use the Landau-Lifshitz-Gilbert formalism to compare the spin-precession amplitudes that different types of impulsive stimulated and ionic Raman scattering processes and their sum-frequency counterparts induce in an antiferromagnetic model system. We show that sum-frequency mechanisms enabled by linearly polarized driving fields yield excitation efficiencies comparable or larger than established Raman techniques, while elliptical polarizations produce only weak and circular polarizations no sum-frequency components at all. The mechanisms presented here complete the map for dynamical spin control by means of Raman-type processes.

Original languageEnglish
Article number094407
JournalPhysical Review B
Volume103
Issue number9
DOIs
StatePublished - 4 Mar 2021
Externally publishedYes

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