Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructures
Abstract Stacking and twisting van der Waals materials provides a powerful tool to engineer quantum matter. For instance, 1T-TaS2 monolayers are Mott insulators, whereas layered 1H-TaS2 is metallic and superconducting; thus, the T/H bilayer, where heavy fermions and unconventional superconducting ph...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-08-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-025-00812-0 |
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| author | Hyeonhu Bae Roser Valentí Igor I. Mazin Binghai Yan |
| author_facet | Hyeonhu Bae Roser Valentí Igor I. Mazin Binghai Yan |
| author_sort | Hyeonhu Bae |
| collection | DOAJ |
| description | Abstract Stacking and twisting van der Waals materials provides a powerful tool to engineer quantum matter. For instance, 1T-TaS2 monolayers are Mott insulators, whereas layered 1H-TaS2 is metallic and superconducting; thus, the T/H bilayer, where heavy fermions and unconventional superconducting phases are expected from localized spins (1T) coexisting with itinerant electrons (1H), has been intensively studied. However, recent studies revealed significant charge transfer that questions this scenario. Here, we propose a T/T/H trilayer heterostructure where the T/T bilayer is a flat-dispersion band insulator with localized electrons, whereas the 1H layer remains metallic with a weak spin polarization. Varying the T/T stacking configuration tunes the flat-band filling, enabling a crossover from a doped-Mott regime to a Kondo-like state. Such a trilayer heterostructure provides, therefore, a rich novel platform to study strong correlation phenomena and unconventional superconductivity. |
| format | Article |
| id | doaj-art-438dc821452c4d24b63eeb115b58a18e |
| institution | Kabale University |
| issn | 2397-4648 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-438dc821452c4d24b63eeb115b58a18e2025-08-24T11:06:21ZengNature Portfolionpj Quantum Materials2397-46482025-08-011011610.1038/s41535-025-00812-0Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructuresHyeonhu Bae0Roser Valentí1Igor I. Mazin2Binghai Yan3Department of Condensed Matter Physics, Weizmann Institute of ScienceInstitute für Theoretische Physik, Goethe-Universität FrankfurtDepartment of Physics and Astronomy, George Mason UniversityDepartment of Condensed Matter Physics, Weizmann Institute of ScienceAbstract Stacking and twisting van der Waals materials provides a powerful tool to engineer quantum matter. For instance, 1T-TaS2 monolayers are Mott insulators, whereas layered 1H-TaS2 is metallic and superconducting; thus, the T/H bilayer, where heavy fermions and unconventional superconducting phases are expected from localized spins (1T) coexisting with itinerant electrons (1H), has been intensively studied. However, recent studies revealed significant charge transfer that questions this scenario. Here, we propose a T/T/H trilayer heterostructure where the T/T bilayer is a flat-dispersion band insulator with localized electrons, whereas the 1H layer remains metallic with a weak spin polarization. Varying the T/T stacking configuration tunes the flat-band filling, enabling a crossover from a doped-Mott regime to a Kondo-like state. Such a trilayer heterostructure provides, therefore, a rich novel platform to study strong correlation phenomena and unconventional superconductivity.https://doi.org/10.1038/s41535-025-00812-0 |
| spellingShingle | Hyeonhu Bae Roser Valentí Igor I. Mazin Binghai Yan Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructures npj Quantum Materials |
| title | Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructures |
| title_full | Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructures |
| title_fullStr | Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructures |
| title_full_unstemmed | Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructures |
| title_short | Designing flat bands, localized and itinerant states in TaS2 trilayer heterostructures |
| title_sort | designing flat bands localized and itinerant states in tas2 trilayer heterostructures |
| url | https://doi.org/10.1038/s41535-025-00812-0 |
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