Correlation-Driven Orbital Order Realizes 2D Metallic Altermagnetism
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912983751327744 |
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| author | Jana, Nirmalya Chakraborty, Atasi Mukherjee, Anamitra Agarwal, Amit |
| author_facet | Jana, Nirmalya Chakraborty, Atasi Mukherjee, Anamitra Agarwal, Amit |
| contents | Two-dimensional metallic altermagnets are rare, and no correlated 2D material has been established to host large nonrelativistic spin splitting. Here we show that spontaneous orbital order, driven by electronic correlations and Fermi surface nesting, provides a general microscopic route to two-dimensional metallic altermagnetism. Antiferro-orbital ordering between the d$_{xz}$ and d$_{yz}$ orbitals breaks the equivalence of magnetic sublattices with opposite spins and generates a symmetry-enforced altermagnetic spin texture. As a concrete realization, we identify monolayer YbMn$_2$Ge$_2$ as a stable correlated metallic altermagnet exhibiting giant nonrelativistic spin splitting of order 1 eV. The resulting phase supports an exceptionally large and gate-tunable transverse spin conductivity. These results establish correlation-driven orbital order as a robust and general mechanism for designing correlated altermagnets with large spin splitting. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_25426 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Correlation-Driven Orbital Order Realizes 2D Metallic Altermagnetism Jana, Nirmalya Chakraborty, Atasi Mukherjee, Anamitra Agarwal, Amit Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Two-dimensional metallic altermagnets are rare, and no correlated 2D material has been established to host large nonrelativistic spin splitting. Here we show that spontaneous orbital order, driven by electronic correlations and Fermi surface nesting, provides a general microscopic route to two-dimensional metallic altermagnetism. Antiferro-orbital ordering between the d$_{xz}$ and d$_{yz}$ orbitals breaks the equivalence of magnetic sublattices with opposite spins and generates a symmetry-enforced altermagnetic spin texture. As a concrete realization, we identify monolayer YbMn$_2$Ge$_2$ as a stable correlated metallic altermagnet exhibiting giant nonrelativistic spin splitting of order 1 eV. The resulting phase supports an exceptionally large and gate-tunable transverse spin conductivity. These results establish correlation-driven orbital order as a robust and general mechanism for designing correlated altermagnets with large spin splitting. |
| title | Correlation-Driven Orbital Order Realizes 2D Metallic Altermagnetism |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.25426 |