Ferrimagnetism of ultracold fermions in a multi-band Hubbard system
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910199567089664 |
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| author | Lebrat, Martin Kale, Anant Kendrick, Lev Haldar Xu, Muqing Gang, Youqi Nikolaenko, Alexander Bonetti, Pietro M. Sachdev, Subir Greiner, Markus |
| author_facet | Lebrat, Martin Kale, Anant Kendrick, Lev Haldar Xu, Muqing Gang, Youqi Nikolaenko, Alexander Bonetti, Pietro M. Sachdev, Subir Greiner, Markus |
| contents | Strongly correlated materials feature multiple electronic orbitals which are crucial to accurately understand their many-body properties, from cuprate materials to twisted bilayer graphene. In such multi-band models, quantum interference can lead to dispersionless bands whose large degeneracy gives rise to itinerant magnetism even with weak interactions. Here, we report on signatures of a ferrimagnetic state realized in a Lieb lattice at half-filling, characterized by antialigned magnetic moments with antiferromagnetic correlations, concomitant with a finite spin polarization. We demonstrate their robustness when increasing repulsive interactions from the non-interacting to the Heisenberg regime, and study their emergence when continuously tuning the lattice unit cell from a square to a Lieb geometry. Our work paves the way towards exploring exotic phases in related multi-orbital models such as quantum spin liquids in kagome lattices and heavy fermion behavior in Kondo models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_17555 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ferrimagnetism of ultracold fermions in a multi-band Hubbard system Lebrat, Martin Kale, Anant Kendrick, Lev Haldar Xu, Muqing Gang, Youqi Nikolaenko, Alexander Bonetti, Pietro M. Sachdev, Subir Greiner, Markus Quantum Gases Strongly Correlated Electrons Quantum Physics Strongly correlated materials feature multiple electronic orbitals which are crucial to accurately understand their many-body properties, from cuprate materials to twisted bilayer graphene. In such multi-band models, quantum interference can lead to dispersionless bands whose large degeneracy gives rise to itinerant magnetism even with weak interactions. Here, we report on signatures of a ferrimagnetic state realized in a Lieb lattice at half-filling, characterized by antialigned magnetic moments with antiferromagnetic correlations, concomitant with a finite spin polarization. We demonstrate their robustness when increasing repulsive interactions from the non-interacting to the Heisenberg regime, and study their emergence when continuously tuning the lattice unit cell from a square to a Lieb geometry. Our work paves the way towards exploring exotic phases in related multi-orbital models such as quantum spin liquids in kagome lattices and heavy fermion behavior in Kondo models. |
| title | Ferrimagnetism of ultracold fermions in a multi-band Hubbard system |
| topic | Quantum Gases Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2404.17555 |