Two-dimensional Stoner transitions beyond mean-field
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866909327894249472 |
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| author | Raines, Zachary M. Chubukov, Andrey V. |
| author_facet | Raines, Zachary M. Chubukov, Andrey V. |
| contents | We have previously shown that the Stoner instability 2D has unconventional behavior: it is strongly first order but features a susceptibility which diverges at the transition point. Here, we analyze the Stoner transition for two-dimensional systems with spin and valley degrees of freedom, beyond mean field. At low density, we show that in one-valley and isotropic two-valley systems the leading effect beyond mean-field theory is suppression of the Stoner instability. In anisotropic two-valley systems, we show that, for larger anisotropy, the transition remains mean-field-like and retains its unconventional properties. We discuss applications to AlAs quantum wells. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_18934 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Two-dimensional Stoner transitions beyond mean-field Raines, Zachary M. Chubukov, Andrey V. Strongly Correlated Electrons We have previously shown that the Stoner instability 2D has unconventional behavior: it is strongly first order but features a susceptibility which diverges at the transition point. Here, we analyze the Stoner transition for two-dimensional systems with spin and valley degrees of freedom, beyond mean field. At low density, we show that in one-valley and isotropic two-valley systems the leading effect beyond mean-field theory is suppression of the Stoner instability. In anisotropic two-valley systems, we show that, for larger anisotropy, the transition remains mean-field-like and retains its unconventional properties. We discuss applications to AlAs quantum wells. |
| title | Two-dimensional Stoner transitions beyond mean-field |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.18934 |