D-Wave Phonon Angular Momentum Texture in Altermagnets by Magnon-Phonon-Hybridization
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908901137448960 |
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| author | Bendin, Hannah Mook, Alexander Mertig, Ingrid Neumann, Robin R. |
| author_facet | Bendin, Hannah Mook, Alexander Mertig, Ingrid Neumann, Robin R. |
| contents | In altermagnets, the magnon bands are anisotropically spin-split in reciprocal space without relativistic or dipolar spin-spin interactions. In this work, we theoretically study magnons and phonons coupled by spin-lattice interaction in a two-dimensional square-lattice d-wave altermagnet. We show that phonon-chirality-selective magnon-phonon hybridization can be caused by interfacial Dzyaloshinskii-Moriya interaction leading to the emergence of hybrid quasiparticles that possess finite phonon angular momentum. These hybrid quasiparticles are called magnon polarons and consist of spin-polarized magnons and chiral phonons. Their phonon angular momentum texture follows the d-wave character of the magnon spin texture opening up the possibility of phononic counterparts to the electronic response effects in altermagnets, such as a phonon angular momentum splitter effect, i.e., the generation of a transverse phonon angular momentum current induced by a temperature gradient -- the bosonic analogue of the spin-splitter effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_08357 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | D-Wave Phonon Angular Momentum Texture in Altermagnets by Magnon-Phonon-Hybridization Bendin, Hannah Mook, Alexander Mertig, Ingrid Neumann, Robin R. Mesoscale and Nanoscale Physics In altermagnets, the magnon bands are anisotropically spin-split in reciprocal space without relativistic or dipolar spin-spin interactions. In this work, we theoretically study magnons and phonons coupled by spin-lattice interaction in a two-dimensional square-lattice d-wave altermagnet. We show that phonon-chirality-selective magnon-phonon hybridization can be caused by interfacial Dzyaloshinskii-Moriya interaction leading to the emergence of hybrid quasiparticles that possess finite phonon angular momentum. These hybrid quasiparticles are called magnon polarons and consist of spin-polarized magnons and chiral phonons. Their phonon angular momentum texture follows the d-wave character of the magnon spin texture opening up the possibility of phononic counterparts to the electronic response effects in altermagnets, such as a phonon angular momentum splitter effect, i.e., the generation of a transverse phonon angular momentum current induced by a temperature gradient -- the bosonic analogue of the spin-splitter effect. |
| title | D-Wave Phonon Angular Momentum Texture in Altermagnets by Magnon-Phonon-Hybridization |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2511.08357 |