Nesting-driven ferromagnetism of itinerant electrons
Fuente:
arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915634199134208 |
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| author | Rodionov, Ya. I. Rozhkov, A. V. Beck, M. E. S. Sboychakov, A. O. Kugel, K. I. Rakhmanov, A. L. |
| author_facet | Rodionov, Ya. I. Rozhkov, A. V. Beck, M. E. S. Sboychakov, A. O. Kugel, K. I. Rakhmanov, A. L. |
| contents | We theoretically investigate a model with electrons and holes whose Fermi surfaces are perfectly nested. The fermions are assumed to be interacting, both with each other and with the lattice. To suppress inhomogeneous states, a sufficiently strong long-range Coulomb repulsion is included into the model. Using the mean field approximation, one can demonstrate that in the absence of doping, the ground state of such a model is insulating and possesses a density-wave order, either SDW, or CDW. Upon doping, a finite ferromagnetic polarization emerges. It is argued that the mechanism driving the ferromagnetism is not of the Stoner type. A phase diagram of the model is constructed, and various properties of the ordered phases, such as half-metallicity and cone magnetic structure, are studied. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_11614 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nesting-driven ferromagnetism of itinerant electrons Rodionov, Ya. I. Rozhkov, A. V. Beck, M. E. S. Sboychakov, A. O. Kugel, K. I. Rakhmanov, A. L. Mesoscale and Nanoscale Physics Strongly Correlated Electrons We theoretically investigate a model with electrons and holes whose Fermi surfaces are perfectly nested. The fermions are assumed to be interacting, both with each other and with the lattice. To suppress inhomogeneous states, a sufficiently strong long-range Coulomb repulsion is included into the model. Using the mean field approximation, one can demonstrate that in the absence of doping, the ground state of such a model is insulating and possesses a density-wave order, either SDW, or CDW. Upon doping, a finite ferromagnetic polarization emerges. It is argued that the mechanism driving the ferromagnetism is not of the Stoner type. A phase diagram of the model is constructed, and various properties of the ordered phases, such as half-metallicity and cone magnetic structure, are studied. |
| title | Nesting-driven ferromagnetism of itinerant electrons |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.11614 |