Chiral Phonons Arising From Chirality-Selective Magnon-Phonon Coupling
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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_ | 1866912715670290432 |
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| author | Weißenhofer, Markus Rieger, Philipp Mrudul, M. S. Mikadze, Luca Nowak, Ulrich Oppeneer, Peter M. |
| author_facet | Weißenhofer, Markus Rieger, Philipp Mrudul, M. S. Mikadze, Luca Nowak, Ulrich Oppeneer, Peter M. |
| contents | Chiral phonons are desirable for applications in spintronics but their generation and control remains a challenge.Here we demonstrate the emergence of truly chiral phonons from selective magnon-phonon coupling in inversion-symmetric magnetic systems. Considering bcc Fe as example, we quantitatively calculate hybridized magnon-phonon quasiparticle states across the entire Brillouin zone utilizing first-principles calculations. Our findings challenge conventional magneto-elastic interpretations and reveal finite zero-point phonon angular momentum and strong anomalous thermal Hall responses linked to finite (spin) Berry curvatures. Our results further establish that the existence of chiral phonons, particularly along high-symmetry directions, is common in many magnetic materials, offering promising avenues for novel spintronic and phononic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_03879 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chiral Phonons Arising From Chirality-Selective Magnon-Phonon Coupling Weißenhofer, Markus Rieger, Philipp Mrudul, M. S. Mikadze, Luca Nowak, Ulrich Oppeneer, Peter M. Materials Science Chiral phonons are desirable for applications in spintronics but their generation and control remains a challenge.Here we demonstrate the emergence of truly chiral phonons from selective magnon-phonon coupling in inversion-symmetric magnetic systems. Considering bcc Fe as example, we quantitatively calculate hybridized magnon-phonon quasiparticle states across the entire Brillouin zone utilizing first-principles calculations. Our findings challenge conventional magneto-elastic interpretations and reveal finite zero-point phonon angular momentum and strong anomalous thermal Hall responses linked to finite (spin) Berry curvatures. Our results further establish that the existence of chiral phonons, particularly along high-symmetry directions, is common in many magnetic materials, offering promising avenues for novel spintronic and phononic devices. |
| title | Chiral Phonons Arising From Chirality-Selective Magnon-Phonon Coupling |
| topic | Materials Science |
| url | https://arxiv.org/abs/2411.03879 |