Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon coupling
Abstract Moiré potential profile can form flat electronic bands and manifest correlated states of electrons, where carrier doping is essential for observing those correlations. In this work, we uncover a hidden but remarkable many-electron effect: doped carriers form a two-dimensional plasmon and st...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-01-01
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| Series: | npj Computational Materials |
| Online Access: | https://doi.org/10.1038/s41524-023-00963-3 |
| _version_ | 1797952417778630656 |
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| author | Linghan Zhu Haonan Wang Li Yang |
| author_facet | Linghan Zhu Haonan Wang Li Yang |
| author_sort | Linghan Zhu |
| collection | DOAJ |
| description | Abstract Moiré potential profile can form flat electronic bands and manifest correlated states of electrons, where carrier doping is essential for observing those correlations. In this work, we uncover a hidden but remarkable many-electron effect: doped carriers form a two-dimensional plasmon and strongly couple with quasiparticles to renormalize moiré potential and realize ultra-flat bands. Using many-body perturbation theory, we demonstrate this effect in twisted MoS2/WS2 heterobilayer. The moiré potential is significantly enhanced upon carrier doping, and the bandwidth is reduced by order of magnitude, leading to drastic quenching of electronic kinetic energy and stronger correlation. We further predict that the competition between correlated mechanisms can be effectively controlled via doping, giving hope to a quantum transition between Mott and charge-transfer insulating states. Our work reveals that the potential renormalization effect of doping is much more significant in determining and controlling many-electron electronic correlations than sole filling-factor tuning in semiconducting moiré crystals. |
| first_indexed | 2024-04-10T22:47:05Z |
| format | Article |
| id | doaj.art-6d8795997cbe47b5ace25b82e925d883 |
| institution | Directory Open Access Journal |
| issn | 2057-3960 |
| language | English |
| last_indexed | 2024-04-10T22:47:05Z |
| publishDate | 2023-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Computational Materials |
| spelling | doaj.art-6d8795997cbe47b5ace25b82e925d8832023-01-15T12:16:38ZengNature Portfolionpj Computational Materials2057-39602023-01-01911710.1038/s41524-023-00963-3Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon couplingLinghan Zhu0Haonan Wang1Li Yang2Department of Physics, Washington University in St. LouisDepartment of Physics, Washington University in St. LouisDepartment of Physics, Washington University in St. LouisAbstract Moiré potential profile can form flat electronic bands and manifest correlated states of electrons, where carrier doping is essential for observing those correlations. In this work, we uncover a hidden but remarkable many-electron effect: doped carriers form a two-dimensional plasmon and strongly couple with quasiparticles to renormalize moiré potential and realize ultra-flat bands. Using many-body perturbation theory, we demonstrate this effect in twisted MoS2/WS2 heterobilayer. The moiré potential is significantly enhanced upon carrier doping, and the bandwidth is reduced by order of magnitude, leading to drastic quenching of electronic kinetic energy and stronger correlation. We further predict that the competition between correlated mechanisms can be effectively controlled via doping, giving hope to a quantum transition between Mott and charge-transfer insulating states. Our work reveals that the potential renormalization effect of doping is much more significant in determining and controlling many-electron electronic correlations than sole filling-factor tuning in semiconducting moiré crystals.https://doi.org/10.1038/s41524-023-00963-3 |
| spellingShingle | Linghan Zhu Haonan Wang Li Yang Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon coupling npj Computational Materials |
| title | Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon coupling |
| title_full | Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon coupling |
| title_fullStr | Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon coupling |
| title_full_unstemmed | Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon coupling |
| title_short | Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon coupling |
| title_sort | moire potential renormalization and ultra flat bands induced by quasiparticle plasmon coupling |
| url | https://doi.org/10.1038/s41524-023-00963-3 |
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