Optical control of spin-splitting in an altermagnet
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914299941748736 |
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| author | Rajpurohit, Sangeeta Karaalp, Revsen Ping, Yuan Tan, Liang Z. Ogitsu, Tadashi Blöchl, Peter E. |
| author_facet | Rajpurohit, Sangeeta Karaalp, Revsen Ping, Yuan Tan, Liang Z. Ogitsu, Tadashi Blöchl, Peter E. |
| contents | Manipulating and controlling the band structure and the spin-splitting in the newly discovered class of magnetic materials known as 'altermagnets' is highly desirable for their application in spintronics. Based on real-time simulations for an interacting multiband tight-binding model, we propose optical excitations as an effective way to selectively control the spin-splitting of an altermagnet. The consistent treatment of electronic interactions and electron-phonon coupling in the model allows for a systematic study of the effect of these interactions on the spin-splitting of the altermagnet in the ground as well as in the excited-state. Our simulations reveal that optical excitations modify the band structure and thus lead to significant changes in the spin-splitting within 50 fs. The relative spin-splitting in the conduction band grows up to four times in the optically excited altermagnet. We disentangle the roles of Coulomb $U$ and $J$ in the enhancement of the spin-splitting in the photoexcited state. Our study elucidates the potential for exploiting optical control of spin-splitting gaps to obtain desirable properties in altermagnets on the fastest possible timescales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_17718 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Optical control of spin-splitting in an altermagnet Rajpurohit, Sangeeta Karaalp, Revsen Ping, Yuan Tan, Liang Z. Ogitsu, Tadashi Blöchl, Peter E. Strongly Correlated Electrons Manipulating and controlling the band structure and the spin-splitting in the newly discovered class of magnetic materials known as 'altermagnets' is highly desirable for their application in spintronics. Based on real-time simulations for an interacting multiband tight-binding model, we propose optical excitations as an effective way to selectively control the spin-splitting of an altermagnet. The consistent treatment of electronic interactions and electron-phonon coupling in the model allows for a systematic study of the effect of these interactions on the spin-splitting of the altermagnet in the ground as well as in the excited-state. Our simulations reveal that optical excitations modify the band structure and thus lead to significant changes in the spin-splitting within 50 fs. The relative spin-splitting in the conduction band grows up to four times in the optically excited altermagnet. We disentangle the roles of Coulomb $U$ and $J$ in the enhancement of the spin-splitting in the photoexcited state. Our study elucidates the potential for exploiting optical control of spin-splitting gaps to obtain desirable properties in altermagnets on the fastest possible timescales. |
| title | Optical control of spin-splitting in an altermagnet |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.17718 |