Plasmon-magnon interactions in two-dimensional honeycomb magnets

Abstract

Two-dimensional honeycomb ferromagnets offer the unprecedented opportunity to study interactions between collective modes that in standard bulk ferromagnets do not cross paths. Indeed, they harbor an optical spin-wave branch, i.e. a spin wave which disperses weakly near the Brillouin zone center. When doped with free carriers, they also host the typical gapless plasmonic mode of 2D itinerant electron/hole systems. When the plasmon branch meets the optical spin-wave branch, energy and momentum matching occurs, paving the way for interactions between the charge and spin sector. In this Letter we present a microscopic theory of such plasmon-magnon interactions, which is based on a double random phase approximation. We comment on the possibility to unveil this physics in recently isolated 2D honeycomb magnets such as ${\mathrm{Cr}}_2{\mathrm{Ge}}_2{\mathrm{Te}}_6$.

Main text: 7 pages; Supplemental Material: 10 pages

References in corpus (12)

• Electric Field Effect in Atomically Thin Carbon Films
• Two Dimensional Atomic Crystals
• Graphene plasmonics
• Magnetic 2D materials and heterostructures
• Highly confined low-loss plasmons in graphene-boron nitride heterostructures
• Half-metallic ferromagnets: From band structure to many-body effects
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• Magnetic Two-Dimensional Chromium Trihalides: A Theoretical Perspective
• Quantum Nanophotonics in Two-Dimensional Materials
• Strong phonon-plasmon coupled modes in the graphene/silicon carbide heterosystem
• Plasmonic Quantum Dots in Twisted Bilayer Graphene
• Semiclassical theory for plasmons in spatially inhomogeneous media

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