Realizing Altermagnetism in Fermi-Hubbard Models with Ultracold Atoms
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916492782600192 |
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| author | Das, Purnendu Leeb, Valentin Knolle, Johannes Knap, Michael |
| author_facet | Das, Purnendu Leeb, Valentin Knolle, Johannes Knap, Michael |
| contents | Altermagnetism represents a type of collinear magnetism, that is in some aspects distinct from ferromagnetism and from conventional antiferromagnetism. In contrast to the latter, sublattices of opposite spin are related by spatial rotations and not only by translations and inversions. As a result, altermagnets have spin-split bands leading to unique experimental signatures. Here, we show theoretically how a d-wave altermagnetic phase can be realized with ultracold fermionic atoms in optical lattices. We propose an altermagnetic Hubbard model with anisotropic next-nearest neighbor hopping and obtain the Hartree-Fock phase diagram. The altermagnetic phase separates in a metallic and an insulating phase and is robust over a large parameter regime. We show that one of the defining characteristics of altermagnetism, the anisotropic spin transport, can be probed with trap-expansion experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_10151 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Realizing Altermagnetism in Fermi-Hubbard Models with Ultracold Atoms Das, Purnendu Leeb, Valentin Knolle, Johannes Knap, Michael Quantum Gases Statistical Mechanics Strongly Correlated Electrons Quantum Physics Altermagnetism represents a type of collinear magnetism, that is in some aspects distinct from ferromagnetism and from conventional antiferromagnetism. In contrast to the latter, sublattices of opposite spin are related by spatial rotations and not only by translations and inversions. As a result, altermagnets have spin-split bands leading to unique experimental signatures. Here, we show theoretically how a d-wave altermagnetic phase can be realized with ultracold fermionic atoms in optical lattices. We propose an altermagnetic Hubbard model with anisotropic next-nearest neighbor hopping and obtain the Hartree-Fock phase diagram. The altermagnetic phase separates in a metallic and an insulating phase and is robust over a large parameter regime. We show that one of the defining characteristics of altermagnetism, the anisotropic spin transport, can be probed with trap-expansion experiments. |
| title | Realizing Altermagnetism in Fermi-Hubbard Models with Ultracold Atoms |
| topic | Quantum Gases Statistical Mechanics Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2312.10151 |