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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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Moiré materials, exciton-polarons, correlated electronic states

刊行年月日: 2022-11-04

出版者: Springer Science and Business Media LLC

掲載誌:

• npj 2D Materials and Applications (ISSN: 23977132) vol. 6 issue. 1 79

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41699-022-00358-w

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更新時刻: 2025-02-28 08:31:07 +0900

MDRでの公開時刻: 2025-02-28 08:31:07 +0900