Magnons in multiorbital Hubbard models, from Lieb to kagome
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866915737552027648 |
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| author | Ying, Teng-Fei Strand, Hugo U. R. Zhou, Benjamin T. van Loon, Erik G. C. P. |
| author_facet | Ying, Teng-Fei Strand, Hugo U. R. Zhou, Benjamin T. van Loon, Erik G. C. P. |
| contents | We investigate the magnetic orders and excitations in a half-filled Hubbard model that continuously interpolates between the Lieb and kagome lattices. Using self-consistent Hartree-Fock approximation combined with real-time two-particle response functions from the Bethe-Salpeter equation in the random phase approximation, we map the $U-t'$ phase diagram of the Lieb-kagome lattices, identifying the typical magnetic states and the corresponding magnetic excitation spectra. In addition to gapless Goldstone magnons, the ferrimagnetic and antiferromagnetic symmetry-broken phases also exhibit gapped Higgs magnon bands, which originate from amplitude fluctuations in the order parameter characterizing spontaneous symmetry breaking. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_07562 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnons in multiorbital Hubbard models, from Lieb to kagome Ying, Teng-Fei Strand, Hugo U. R. Zhou, Benjamin T. van Loon, Erik G. C. P. Strongly Correlated Electrons We investigate the magnetic orders and excitations in a half-filled Hubbard model that continuously interpolates between the Lieb and kagome lattices. Using self-consistent Hartree-Fock approximation combined with real-time two-particle response functions from the Bethe-Salpeter equation in the random phase approximation, we map the $U-t'$ phase diagram of the Lieb-kagome lattices, identifying the typical magnetic states and the corresponding magnetic excitation spectra. In addition to gapless Goldstone magnons, the ferrimagnetic and antiferromagnetic symmetry-broken phases also exhibit gapped Higgs magnon bands, which originate from amplitude fluctuations in the order parameter characterizing spontaneous symmetry breaking. |
| title | Magnons in multiorbital Hubbard models, from Lieb to kagome |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.07562 |