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We develop a microscopic theory for plasmon excitations ofgraphene/${\alpha}$-RuCl${_3}$ heterostructures. Within a Kondo-Kitaev modelwith various interactions, a heavy Fermi liquid hosting flat bands emerges inwhich the itinerant electrons of graphene effectively hybridize with thefractionalized fermions of the Kitaev quantum spin liquid. We find novelcorrelated plasmon bands induced by the interplay of flat bands andinteractions and argue that our theory is consistent with the availableexperimental data on graphene/${\alpha}$-RuCl${_3}$ heterostructures. Wepredict novel plasmon branches beyond the long-wavelength limit and discuss theimplications for probing correlation phenomena in other flat band systems.

Flat and Correlated Plasmon Bands in Graphene/${\alpha}$-RuCl${_3}$ Heterostructures