Altermagnetism in modified Lieb lattice Hubbard model
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916541171236864 |
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| author | Kaushal, Nitin Franz, Marcel |
| author_facet | Kaushal, Nitin Franz, Marcel |
| contents | We study the emergence of altermagnetism from repulsive interactions for electrons on the Lieb lattice as a model of quasi-2D oxychalcogenides with the so-called "anti-CuO$_{2}$" lattice structure. A comprehensive study of the Lieb lattice Hubbard model, using unrestricted Hartree-Fock and exact diagonalization techniques, establishes the presence of spin-${1\over 2}$ altermagnetic Mott insulating ground state for average electron densities of 2 and 4 per unit cell. Both phases show the characteristic spin splitting in the electron bands as well as in the magnon bands, as indicated by solutions of an effective spin-${1\over 2}$ Heisenberg model that we construct. We also provide evidence for altermagnetic metal formation in the electron- and hole-doped Mott state, giving rise to Fermi surfaces with $d_{x^{2}-y^{2}}$-wave spin splitting and quasi-one-dimensional characteristics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_16421 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Altermagnetism in modified Lieb lattice Hubbard model Kaushal, Nitin Franz, Marcel Strongly Correlated Electrons We study the emergence of altermagnetism from repulsive interactions for electrons on the Lieb lattice as a model of quasi-2D oxychalcogenides with the so-called "anti-CuO$_{2}$" lattice structure. A comprehensive study of the Lieb lattice Hubbard model, using unrestricted Hartree-Fock and exact diagonalization techniques, establishes the presence of spin-${1\over 2}$ altermagnetic Mott insulating ground state for average electron densities of 2 and 4 per unit cell. Both phases show the characteristic spin splitting in the electron bands as well as in the magnon bands, as indicated by solutions of an effective spin-${1\over 2}$ Heisenberg model that we construct. We also provide evidence for altermagnetic metal formation in the electron- and hole-doped Mott state, giving rise to Fermi surfaces with $d_{x^{2}-y^{2}}$-wave spin splitting and quasi-one-dimensional characteristics. |
| title | Altermagnetism in modified Lieb lattice Hubbard model |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.16421 |