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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.14326 |
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| _version_ | 1866914120210579456 |
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| author | Fischer, Max Poli, Arianna Crippa, Lorenzo Călugăru, Dumitru Ciuchi, Sergio Vojta, Matthias Toschi, Alessandro Sangiovanni, Giorgio |
| author_facet | Fischer, Max Poli, Arianna Crippa, Lorenzo Călugăru, Dumitru Ciuchi, Sergio Vojta, Matthias Toschi, Alessandro Sangiovanni, Giorgio |
| contents | The Kondo screening of a localized magnetic moment crucially depends on the spectral properties of the electronic bath to which it is coupled. Unlike textbook examples, realistic systems as well as dynamical mean-field theory of correlated lattice models force us to explicitly consider sharp features in the hybridization function near the Fermi energy. A case currently under the spotlight is twisted bilayer graphene, where the hybridization function of the heavy-fermion-like bands to the itinerant ones displays a divergence. We clarify how this impacts the screening mechanisms by means of a toy model with a tunable $δ$-peak in the hybridization function, superimposed to a regular part. Our analysis unveils an unexpectedly big impact on the Kondo screening already for a parametrically small weight of the flat band in the bath. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_14326 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fragility of local moments against hybridization with flat bands Fischer, Max Poli, Arianna Crippa, Lorenzo Călugăru, Dumitru Ciuchi, Sergio Vojta, Matthias Toschi, Alessandro Sangiovanni, Giorgio Strongly Correlated Electrons The Kondo screening of a localized magnetic moment crucially depends on the spectral properties of the electronic bath to which it is coupled. Unlike textbook examples, realistic systems as well as dynamical mean-field theory of correlated lattice models force us to explicitly consider sharp features in the hybridization function near the Fermi energy. A case currently under the spotlight is twisted bilayer graphene, where the hybridization function of the heavy-fermion-like bands to the itinerant ones displays a divergence. We clarify how this impacts the screening mechanisms by means of a toy model with a tunable $δ$-peak in the hybridization function, superimposed to a regular part. Our analysis unveils an unexpectedly big impact on the Kondo screening already for a parametrically small weight of the flat band in the bath. |
| title | Fragility of local moments against hybridization with flat bands |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.14326 |