Terahertz field-induced nonlinear coupling of two magnon modes in an antiferromagnet

Abstract

Magnons are quantized collective spin-wave excitations in magnetically ordered materials. Revealing their interactions among these collective modes is crucial for the understanding of fundamental many-body effects in such systems and the development of high-speed information transport and processing devices based on them. Nevertheless, identifying couplings between individual magnon modes remains a long-standing challenge. Here, we demonstrate spectroscopic fingerprints of anharmonic coupling between distinct magnon modes in an antiferromagnet, as evidenced by coherent photon emission at the sum and difference frequencies of the two modes. This discovery is enabled by driving two magnon modes coherently with a pair of tailored terahertz fields and then disentangling a mixture of nonlinear responses with different origins. Our approach provides a route for generating nonlinear magnon-magnon mixing.

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• Exploring Two-dimensional Coherent Spectroscopy with Exact Diagonalization: Spinons and Confinement in 1D Quantum Magnets
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• Extracting Nonlinear Dynamical Response Functions from Time Evolution
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• Disentangling spin excitation continua in classical and quantum magnets using 2D nonlinear spectroscopy
• Efficient spin-wave excitation by surface acoustic waves in ultra-low damping YIG/ZnO-heterostructures
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• Floquet theory and applications in open quantum and classical systems
• Magnetic-Field and Strain Engineering of Modulated Transverse Transport in Altermagnetic Topological Materials
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• Magnon Nesting in Driven Two-Dimensional Quantum Magnets
• Spin and lattice dynamics at the spin-reorientation transitions in the rare-earth orthoferrite Sm${}_{0.55}$Tb${}_{0.45}$FeO${}_3$
• Electromagnon signatures of a metastable multiferroic state
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