Nonrelativistic spin splittings and altermagnetism in twisted bilayers of centrosymmetric antiferromagnets
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866913293298302976 |
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| author | Sheoran, Sajjan Bhattacharya, Saswata |
| author_facet | Sheoran, Sajjan Bhattacharya, Saswata |
| contents | Magnetism-driven nonrelativistic spin splittings (NRSS) are promising for highly efficient spintronics applications. Although 2D centrosymmetric (in four-dimensional spacetime) antiferromagnets are abundant, they have not received extensive research attention owing to symmetry-forbidden spin polarization and magnetization. Here, we demonstrate a paradigm to harness NRSS by twisting the bilayer of centrosymmetric antiferromagnets with commensurate twist angles. We observe $i$-wave altermagnetism and spin-momentum locking by first-principles simulations and symmetry analysis on prototypical MnPSe$_3$ and MnSe antiferromagnets. The strength of NRSS (up to 80 meVÅ) induced by twisting is comparable to SOC-induced linear Rashba-Dresselhaus effects. The results also demonstrate how applying biaxial strain and a vertical electric field tune the NRSS. The findings reveal the untapped potential of centrosymmetric antiferromagnets and thus expand the material's horizons in spintronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_19395 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Nonrelativistic spin splittings and altermagnetism in twisted bilayers of centrosymmetric antiferromagnets Sheoran, Sajjan Bhattacharya, Saswata Materials Science Mesoscale and Nanoscale Physics Magnetism-driven nonrelativistic spin splittings (NRSS) are promising for highly efficient spintronics applications. Although 2D centrosymmetric (in four-dimensional spacetime) antiferromagnets are abundant, they have not received extensive research attention owing to symmetry-forbidden spin polarization and magnetization. Here, we demonstrate a paradigm to harness NRSS by twisting the bilayer of centrosymmetric antiferromagnets with commensurate twist angles. We observe $i$-wave altermagnetism and spin-momentum locking by first-principles simulations and symmetry analysis on prototypical MnPSe$_3$ and MnSe antiferromagnets. The strength of NRSS (up to 80 meVÅ) induced by twisting is comparable to SOC-induced linear Rashba-Dresselhaus effects. The results also demonstrate how applying biaxial strain and a vertical electric field tune the NRSS. The findings reveal the untapped potential of centrosymmetric antiferromagnets and thus expand the material's horizons in spintronics. |
| title | Nonrelativistic spin splittings and altermagnetism in twisted bilayers of centrosymmetric antiferromagnets |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2310.19395 |