Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice
Abstract 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: optically inje...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-11-01
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| Series: | npj 2D Materials and Applications |
| Online Access: | https://doi.org/10.1038/s41699-022-00358-w |
| _version_ | 1797984675481780224 |
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| author | Aidan J. Campbell Mauro Brotons-Gisbert Hyeonjun Baek Valerio Vitale Takashi Taniguchi Kenji Watanabe Johannes Lischner Brian D. Gerardot |
| author_facet | Aidan J. Campbell Mauro Brotons-Gisbert Hyeonjun Baek Valerio Vitale Takashi Taniguchi Kenji Watanabe Johannes Lischner Brian D. Gerardot |
| author_sort | Aidan J. Campbell |
| collection | DOAJ |
| description | Abstract 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: optically injected excitons can interact with itinerant carriers occupying narrow moiré bands to form exciton-polarons sensitive to strong correlations. Here, we investigate the behaviour of excitons dressed by a Fermi sea localised by the moiré superlattice of a molybdenum diselenide (MoSe2)/tungsten diselenide (WSe2) twisted hetero-bilayer. 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 in the correlated hole phases, with a maximum close to the correlated state at one hole per site. The temperature dependence of the Zeeman splitting reveals antiferromagnetic ordering of the correlated holes across a wide range of fractional fillings. Our results illustrate the nature of exciton-polarons in the presence of strongly correlated electronic states and reveal the rich potential of the MoSe2/WSe2 platform for investigations of Fermi–Hubbard and Bose–Hubbard physics. |
| first_indexed | 2024-04-11T07:05:47Z |
| format | Article |
| id | doaj.art-756a4cd475674164a92a8dedaf763dfe |
| institution | Directory Open Access Journal |
| issn | 2397-7132 |
| language | English |
| last_indexed | 2024-04-11T07:05:47Z |
| publishDate | 2022-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj 2D Materials and Applications |
| spelling | doaj.art-756a4cd475674164a92a8dedaf763dfe2022-12-22T04:38:23ZengNature Portfolionpj 2D Materials and Applications2397-71322022-11-01611810.1038/s41699-022-00358-wExciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlatticeAidan J. Campbell0Mauro Brotons-Gisbert1Hyeonjun Baek2Valerio Vitale3Takashi Taniguchi4Kenji Watanabe5Johannes Lischner6Brian D. Gerardot7Institute of Photonics and Quantum Sciences, SUPA, Heriot-Watt UniversityInstitute of Photonics and Quantum Sciences, SUPA, Heriot-Watt UniversityInstitute of Photonics and Quantum Sciences, SUPA, Heriot-Watt UniversityDepartments of Materials and Physics and the Thomas Young Centre for Theory and Simulation of Materials, Imperial College LondonInternational Center for Materials Nanoarchitectonics, National Institute for Materials ScienceResearch Center for Functional Materials, National Institute for Materials ScienceDepartments of Materials and Physics and the Thomas Young Centre for Theory and Simulation of Materials, Imperial College LondonInstitute of Photonics and Quantum Sciences, SUPA, Heriot-Watt UniversityAbstract 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: optically injected excitons can interact with itinerant carriers occupying narrow moiré bands to form exciton-polarons sensitive to strong correlations. Here, we investigate the behaviour of excitons dressed by a Fermi sea localised by the moiré superlattice of a molybdenum diselenide (MoSe2)/tungsten diselenide (WSe2) twisted hetero-bilayer. 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 in the correlated hole phases, with a maximum close to the correlated state at one hole per site. The temperature dependence of the Zeeman splitting reveals antiferromagnetic ordering of the correlated holes across a wide range of fractional fillings. Our results illustrate the nature of exciton-polarons in the presence of strongly correlated electronic states and reveal the rich potential of the MoSe2/WSe2 platform for investigations of Fermi–Hubbard and Bose–Hubbard physics.https://doi.org/10.1038/s41699-022-00358-w |
| spellingShingle | 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 |
| title | Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice |
| title_full | Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice |
| title_fullStr | Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice |
| title_full_unstemmed | Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice |
| title_short | Exciton-polarons in the presence of strongly correlated electronic states in a MoSe2/WSe2 moiré superlattice |
| title_sort | exciton polarons in the presence of strongly correlated electronic states in a mose2 wse2 moire superlattice |
| url | https://doi.org/10.1038/s41699-022-00358-w |
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