Altermagnetic anomalous Hall effect emerging from electronic correlations
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916380574482432 |
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| author | Sato, Toshihiro Haddad, Sonia Fulga, Ion Cosma Assaad, Fakher F. Brink, Jeroen van den |
| author_facet | Sato, Toshihiro Haddad, Sonia Fulga, Ion Cosma Assaad, Fakher F. Brink, Jeroen van den |
| contents | While altermagnetic materials are characterized by a vanishing net magnetic moment, their symmetry in principle allows for the existence of an anomalous Hall effect (AHE). Here we introduce a model with altermagnetism in which the emergence of an AHE is driven by interactions. This model is grounded in a modified Kane-Mele framework with antiferromagnetic (AFM) spin-spin correlations. Quantum Monte Carlo simulations show that the system undergoes a finite temperature phase transition governed by a primary AFM order parameter accompanied by a secondary one of Haldane type. The emergence of both orders turns the metallic state of the system, away from half-filling, to an altermagnet with a finite anomalous Hall conductivity. A mean field ansatz corroborates these results, which pave the way into the study of correlation induced altermagnets with finite Berry curvature. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2312_16290 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Altermagnetic anomalous Hall effect emerging from electronic correlations Sato, Toshihiro Haddad, Sonia Fulga, Ion Cosma Assaad, Fakher F. Brink, Jeroen van den Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science While altermagnetic materials are characterized by a vanishing net magnetic moment, their symmetry in principle allows for the existence of an anomalous Hall effect (AHE). Here we introduce a model with altermagnetism in which the emergence of an AHE is driven by interactions. This model is grounded in a modified Kane-Mele framework with antiferromagnetic (AFM) spin-spin correlations. Quantum Monte Carlo simulations show that the system undergoes a finite temperature phase transition governed by a primary AFM order parameter accompanied by a secondary one of Haldane type. The emergence of both orders turns the metallic state of the system, away from half-filling, to an altermagnet with a finite anomalous Hall conductivity. A mean field ansatz corroborates these results, which pave the way into the study of correlation induced altermagnets with finite Berry curvature. |
| title | Altermagnetic anomalous Hall effect emerging from electronic correlations |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2312.16290 |