Sum-frequency excitation of coherent magnons

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 circularly polarizations no sum-frequency components at all. The mechanisms presented here complete the map for dynamical spin control by the means of Raman-type processes.

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• Giant effective magnetic moments of chiral phonons from orbit-lattice coupling
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• Cavity magnon-polaritons in cuprate parent compounds
• Cavity control of nonlinear phononics
• Empowering Control of Antiferromagnets by THz-induced Spin Coherence
• Impulsive Fermi magnon-phonon resonance in antiferromagnetic $Co{F}_2$
• Generating coherent phonon waves in narrow-band materials: a twisted bilayer graphene phaser
• Polarization-selective magneto-optical modulation
• Quantum measurement with recycled photons
• Polar phonons and magnetic excitations in the antiferromagnet CoF${}_2$
• Terahertz light driven coherent excitation of a zone-folded Raman-active phonon mode in the Spin-Ladder System ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• Terahertz spin-orbit torque as a drive of spin dynamics in the insulating antiferromagnet Cr${}_2$O${}_3$