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We experimentally demonstrate dressing of the excited exciton states by acontinuously tunable Fermi sea of free charge carriers in a monolayersemiconductor. It represents an unusual scenario of two-particle excitations ofcharged excitons previously inaccessible in conventional material systems. Weidentify excited state trions, accurately determine their binding energies inthe zero-density limit for both electron- and hole-doped regimes, and observeemerging many-body phenomena at elevated doping. Combining experiment andtheory we gain access to the intra-exciton coupling facilitated by theinteraction with free charge carriers. We provide evidence for a process ofautoionization for quasiparticles, a unique scattering pathway available forexcited states in atomic systems. Finally, we demonstrate a complete transferof the optical transition strength from the excited excitons to dressedexcitons, Fermi polarons, as well as the associated light emission from theirnon-equilibrium populations.

Autoionization and dressing of excited excitons by free carriers in monolayer WSe2