Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice

Aidan J. Campbell; Mauro Brotons-Gisbert; Hyeonjun Baek; Valerio Vitale; Takashi Taniguchi; Kenji Watanabe; Johannes Lischner; Brian D. Gerardot

doi:10.1038/s41699-022-00358-w

Journal article Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice

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Aidan J. Campbell, Mauro Brotons-Gisbert, Hyeonjun Baek, Valerio Vitale, Takashi Taniguchi, Kenji Watanabe, Johannes Lischner, Brian D. Gerardot. Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice. npj 2D Materials and Applications. 2022, 6 (1), 79. https://doi.org/10.1038/s41699-022-00358-w

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Two-dimensional moiré materials provide a highly tunable platform to investigate strongly correlated electronic states. Such emergent many-body phenomena can be optically probed in moiré systems created by stacking two layers of transition metal dichalcogenide semiconductors: opti- cally injected excitons can interact with itinerant carriers occupying narrow moiré bands to form exciton-polarons sensitive to strong correlations. Here, we investigate the many-body interactions between excitons and a Fermi sea that is spatially pinned by the moiré superlattice of a molybdenum diselenide (MoSe2) / tungsten diselenide (WSe2) twisted heterobilayer. At a multitude of fractional fillings of the moiré lattice, we observe ordering of both electrons and holes into stable correlated electronic states. Magneto-optical measurements reveal extraordinary Zeeman splittings of the exciton-polarons due to exchange interactions between holes in the correlated phases, with a maximum close to the correlated state at one hole per site. The temperature dependence of the Zeeman splitting reveals anti-ferromagnetic ordering of the correlated holes across a wide range of fractional fillings. Our results illustrate the nature of excitons interacting with a spatially pinned Fermi sea and provide robust evidence for strongly correlated electronic states in MoSe2/WSe2 het- erobilayers, unveiling the rich potential of this platform for investigations of Fermi-Hubbard and Bose-Hubbard physics.

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