Mixed phases in a Fermi--Hubbard model describing altermagnetism
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arXiv
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908414667390976 |
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| author | Langmann, E. Lenells, J. |
| author_facet | Langmann, E. Lenells, J. |
| contents | We study an extension of the 2D Fermi--Hubbard model, which was recently introduced in [Das et al., Phys. Rev. Lett. 132, 263402 (2024)] and shown to describe altermagnetism that can be studied in cold atom systems. Using an updated Hartree--Fock method that can detect instabilities towards phase separation, we show that the model is in a mixed phase in large parts of the parameter regime at half-filling. We argue that the occurrence of a mixed phase is an indication of exotic physics which, in this model, occurs in parameter regimes accessible in cold atom experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_16503 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mixed phases in a Fermi--Hubbard model describing altermagnetism Langmann, E. Lenells, J. Quantum Gases Strongly Correlated Electrons Mathematical Physics We study an extension of the 2D Fermi--Hubbard model, which was recently introduced in [Das et al., Phys. Rev. Lett. 132, 263402 (2024)] and shown to describe altermagnetism that can be studied in cold atom systems. Using an updated Hartree--Fock method that can detect instabilities towards phase separation, we show that the model is in a mixed phase in large parts of the parameter regime at half-filling. We argue that the occurrence of a mixed phase is an indication of exotic physics which, in this model, occurs in parameter regimes accessible in cold atom experiments. |
| title | Mixed phases in a Fermi--Hubbard model describing altermagnetism |
| topic | Quantum Gases Strongly Correlated Electrons Mathematical Physics |
| url | https://arxiv.org/abs/2506.16503 |