Magnon-Plasmon Hybridization Mediated by Spin-Orbit Interaction in Magnetic Materials

Abstract

We propose a mechanism for magnon-plasmon coupling and hybridization in ferromagnetic (FM) and antiferromagnetic (AFM) systems. The electric field associated with plasmon oscillations creates a non-equilibrium spin density via the inverse spin galvanic effect. This plasmon-induced spin density couples to magnons by an exchange interaction. The strength of magnon-plasmon coupling depends on the magneto-electric susceptibility of the system and the wavevector at which the level repulsion is happened. This wavevector may be tuned by an applied magnetic field. In AFM systems, the degeneracy of two chiral magnons is broken in the presence of a magnetic field, and we find two separate hybrid modes for left-handed and right-handed AFM magnons. Furthermore, we show that magnon-plasmon coupling in AFM systems is enhanced because of strong intra-sublattice spin dynamics. We argue that the recently discovered two-dimensional magnetic systems are ideal platforms to investigate proposed magnon-plasmon hybrid modes.

5 pages, 1 figure

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Cited by in corpus (13)

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• Electrical tuning of the magnetic properties of 2D magnets: the case of ${\mathrm{Cr}}_2{\mathrm{Ge}}_2{\mathrm{Te}}_6$
• Magnons from time-dependent density-functional perturbation theory and nonempirical Hubbard functionals
• Chiral magnon-polaron edge states in Heisenberg-Kitaev magnets
• Impact of spin torques and spin pumping phenomena on magnon-plasmon polaritons in antiferromagnetic insulator-semiconductor heterostructures
• Tunable magnon band topology and magnon orbital Nernst effect in noncollinear antiferromagnets
• Electric polarization induced by magnons and magnon Nernst effects
• The magnon mediated plasmon friction: a functional integral approach
• Coupling of plasmons to the two-magnon continuum in antiferromagnets
• Topological Magnon-Plasmon Hybrids
• Hybrid collective excitations in topological superconductor/ferromagnetic insulator heterostructures