Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures
Abstract Graphene has aroused great attention due to the intriguing properties associated with its low-energy Dirac Hamiltonian. When graphene is coupled with a correlated insulating substrate, electronic states that cannot be revealed in either individual layer may emerge in a synergistic manner. H...
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| Format: | Article |
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Nature Portfolio
2023-09-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-41293-8 |
| _version_ | 1797558485928378368 |
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| author | Xin Lu Shihao Zhang Yaning Wang Xiang Gao Kaining Yang Zhongqing Guo Yuchen Gao Yu Ye Zheng Han Jianpeng Liu |
| author_facet | Xin Lu Shihao Zhang Yaning Wang Xiang Gao Kaining Yang Zhongqing Guo Yuchen Gao Yu Ye Zheng Han Jianpeng Liu |
| author_sort | Xin Lu |
| collection | DOAJ |
| description | Abstract Graphene has aroused great attention due to the intriguing properties associated with its low-energy Dirac Hamiltonian. When graphene is coupled with a correlated insulating substrate, electronic states that cannot be revealed in either individual layer may emerge in a synergistic manner. Here, we theoretically study the correlated and topological states in Coulomb-coupled and gate-tunable graphene-insulator heterostructures. By electrostatically aligning the electronic bands, charge carriers transferred between graphene and the insulator can yield a long-wavelength electronic crystal at the interface, exerting a superlattice Coulomb potential on graphene and generating topologically nontrivial subbands. This coupling can further boost electron-electron interaction effects in graphene, leading to a spontaneous bandgap formation at the Dirac point and interaction-enhanced Fermi velocity. Reciprocally, the electronic crystal at the interface is substantially stabilized with the help of cooperative interlayer Coulomb coupling. We propose a number of substrate candidates for graphene to experimentally demonstrate these effects. |
| first_indexed | 2024-03-10T17:31:06Z |
| format | Article |
| id | doaj.art-e17a40fa9b8b46248e1f8e498965c161 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-10T17:31:06Z |
| publishDate | 2023-09-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-e17a40fa9b8b46248e1f8e498965c1612023-11-20T10:01:44ZengNature PortfolioNature Communications2041-17232023-09-0114111210.1038/s41467-023-41293-8Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructuresXin Lu0Shihao Zhang1Yaning Wang2Xiang Gao3Kaining Yang4Zhongqing Guo5Yuchen Gao6Yu Ye7Zheng Han8Jianpeng Liu9School of Physical Science and Technology, ShanghaiTech UniversitySchool of Physical Science and Technology, ShanghaiTech UniversityShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of SciencesState Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi UniversityState Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi UniversitySchool of Physical Science and Technology, ShanghaiTech UniversityCollaborative Innovation Center of Quantum MatterCollaborative Innovation Center of Quantum MatterState Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi UniversitySchool of Physical Science and Technology, ShanghaiTech UniversityAbstract Graphene has aroused great attention due to the intriguing properties associated with its low-energy Dirac Hamiltonian. When graphene is coupled with a correlated insulating substrate, electronic states that cannot be revealed in either individual layer may emerge in a synergistic manner. Here, we theoretically study the correlated and topological states in Coulomb-coupled and gate-tunable graphene-insulator heterostructures. By electrostatically aligning the electronic bands, charge carriers transferred between graphene and the insulator can yield a long-wavelength electronic crystal at the interface, exerting a superlattice Coulomb potential on graphene and generating topologically nontrivial subbands. This coupling can further boost electron-electron interaction effects in graphene, leading to a spontaneous bandgap formation at the Dirac point and interaction-enhanced Fermi velocity. Reciprocally, the electronic crystal at the interface is substantially stabilized with the help of cooperative interlayer Coulomb coupling. We propose a number of substrate candidates for graphene to experimentally demonstrate these effects.https://doi.org/10.1038/s41467-023-41293-8 |
| spellingShingle | Xin Lu Shihao Zhang Yaning Wang Xiang Gao Kaining Yang Zhongqing Guo Yuchen Gao Yu Ye Zheng Han Jianpeng Liu Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures Nature Communications |
| title | Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures |
| title_full | Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures |
| title_fullStr | Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures |
| title_full_unstemmed | Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures |
| title_short | Synergistic correlated states and nontrivial topology in coupled graphene-insulator heterostructures |
| title_sort | synergistic correlated states and nontrivial topology in coupled graphene insulator heterostructures |
| url | https://doi.org/10.1038/s41467-023-41293-8 |
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