Exciton-based sensing of remote electron correlations in 2D heterostructures
Abstract
Many monolayer transition metal dichalcogenides, including MoS2, MoSe2, WS2, and WSe2, are direct bandgap two-dimensional (2D) semiconductors with sharp optical resonances at excitonic bound state frequencies. Recent experiments have demonstrated that excitonic resonance frequencies in multilayer van der Waals stacks are altered by long-range Coulomb interactions with electrons in nearby but electrically isolated 2D materials. These modulations have been successfully used to detect transitions between distinct states of remote strongly correlated 2D electron fluids. In this Letter we provide a theory of these frequency shifts, enabling a more quantitative interpretation of excitonic-sensing experiments, and apply it as an example to WSe2 that is proximate to graphene bilayers and multilayers.
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