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Ferrimagnetism of ultracold fermions in a multiband Hubbard system.

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Title: Ferrimagnetism of ultracold fermions in a multiband Hubbard system.
Authors: Lebrat, Martin (AUTHOR), Kale, Anant (AUTHOR), Kendrick, Lev Haldar (AUTHOR), Xu, Muqing (AUTHOR), Gang, Youqi (AUTHOR), Nikolaenko, Alexander (AUTHOR), Bonetti, Pietro M. (AUTHOR), Sachdev, Subir (AUTHOR), Greiner, Markus (AUTHOR)
Source: Science. 5/7/2026, Vol. 392 Issue 6798, p612-616. 5p.
Subjects: Ferrimagnetism, Hubbard model, Quantum gases, Spin polarization, Optical lattices
Abstract: Strongly correlated materials feature multiple electronic orbitals, which are crucial to accurately understanding their many-body properties. In such multiband models, quantum interference can lead to flat energy bands with large degeneracy that gives rise to itinerant magnetic phases. We report on signatures of a ferrimagnetic state realized in a Lieb lattice with ultracold fermions, characterized by antialigned magnetic moments with antiferromagnetic correlations, and concomitant with a finite spin polarization. The signatures remain robust when increasing repulsive interactions from the weakly interacting to the Heisenberg regime and emerge when continuously tuning the lattice unit cell from a square to a Lieb geometry. Our flexible approach paves the way toward exploring exotic phases, such as quantum spin liquids in kagome lattices and heavy fermion behavior in Kondo models. Editor's summary: Copper oxide superconductors and other strongly interacting systems are thought to be described by the Hubbard model. This model, which accounts for particle hopping and interactions, can be simulated using cold atoms in optical lattices. However, incorporating multiple energy bands, which is thought to be important for an accurate description of the physics, is tricky. Lebrat et al. performed the quantum simulation of a multiband Hubbard model using fermionic lithium-6 atoms in an optical Lieb lattice, which can be viewed as a simplified description of the copper oxide lattice. Because two the sublattices constituting the Lieb lattice have an unequal number of sites, this system is expected to exhibit ferrimagnetism, which the researchers observed through site-resolved measurements of spin. —Jelena Stajic [ABSTRACT FROM AUTHOR]
Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Ferrimagnetism of ultracold fermions in a multiband Hubbard system.
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  Data: <searchLink fieldCode="JN" term="%22Science%22">Science</searchLink>. 5/7/2026, Vol. 392 Issue 6798, p612-616. 5p.
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  Data: Strongly correlated materials feature multiple electronic orbitals, which are crucial to accurately understanding their many-body properties. In such multiband models, quantum interference can lead to flat energy bands with large degeneracy that gives rise to itinerant magnetic phases. We report on signatures of a ferrimagnetic state realized in a Lieb lattice with ultracold fermions, characterized by antialigned magnetic moments with antiferromagnetic correlations, and concomitant with a finite spin polarization. The signatures remain robust when increasing repulsive interactions from the weakly interacting to the Heisenberg regime and emerge when continuously tuning the lattice unit cell from a square to a Lieb geometry. Our flexible approach paves the way toward exploring exotic phases, such as quantum spin liquids in kagome lattices and heavy fermion behavior in Kondo models. Editor's summary: Copper oxide superconductors and other strongly interacting systems are thought to be described by the Hubbard model. This model, which accounts for particle hopping and interactions, can be simulated using cold atoms in optical lattices. However, incorporating multiple energy bands, which is thought to be important for an accurate description of the physics, is tricky. Lebrat et al. performed the quantum simulation of a multiband Hubbard model using fermionic lithium-6 atoms in an optical Lieb lattice, which can be viewed as a simplified description of the copper oxide lattice. Because two the sublattices constituting the Lieb lattice have an unequal number of sites, this system is expected to exhibit ferrimagnetism, which the researchers observed through site-resolved measurements of spin. —Jelena Stajic [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.adq2411
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        Text: English
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      – SubjectFull: Quantum gases
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      – SubjectFull: Spin polarization
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      – SubjectFull: Optical lattices
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              Text: 5/7/2026
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