Non-equilibrium correlation effects in spin transport through the 2D ferromagnet Fe$_4$GeTe$_2$
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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917047976329216 |
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| author | Nell, Declan Sanvito, Stefano Droghetti, Andrea |
| author_facet | Nell, Declan Sanvito, Stefano Droghetti, Andrea |
| contents | Understanding non-equilibrium spin transport through 2D ferromagnets is a theoretical challenge, as correlations produce a complex electronic structure with coexisting itinerant and localized electrons. We have developed a fully non-equilibrium ab initio method, combining density functional theory, dynamical mean-field theory, and non-equilibrium Green's functions to investigate the transport in Fe$_4$GeTe$_2$, a prototypical high-temperature 2D ferromagnet. We show that, while spin transport remains essentially single-particle under moderate bias, inelastic spin-dependent scattering of carriers with particle-hole excitations drives a distinctive hot-correlated electron regime beyond a critical voltage. This regime is marked by incoherent features in both the electronic spectrum and the conductance, which are experimentally accessible. Our results demonstrates that material-specific many-body non-equilibrium methods are essential for a complete understanding of spin transport in 2D ferromagnets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_24322 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Non-equilibrium correlation effects in spin transport through the 2D ferromagnet Fe$_4$GeTe$_2$ Nell, Declan Sanvito, Stefano Droghetti, Andrea Strongly Correlated Electrons Understanding non-equilibrium spin transport through 2D ferromagnets is a theoretical challenge, as correlations produce a complex electronic structure with coexisting itinerant and localized electrons. We have developed a fully non-equilibrium ab initio method, combining density functional theory, dynamical mean-field theory, and non-equilibrium Green's functions to investigate the transport in Fe$_4$GeTe$_2$, a prototypical high-temperature 2D ferromagnet. We show that, while spin transport remains essentially single-particle under moderate bias, inelastic spin-dependent scattering of carriers with particle-hole excitations drives a distinctive hot-correlated electron regime beyond a critical voltage. This regime is marked by incoherent features in both the electronic spectrum and the conductance, which are experimentally accessible. Our results demonstrates that material-specific many-body non-equilibrium methods are essential for a complete understanding of spin transport in 2D ferromagnets. |
| title | Non-equilibrium correlation effects in spin transport through the 2D ferromagnet Fe$_4$GeTe$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.24322 |