Spontaneous magnon decay in two-dimensional altermagnets
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915487930122240 |
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| author | Cichutek, Niklas Kopietz, Peter Rückriegel, Andreas |
| author_facet | Cichutek, Niklas Kopietz, Peter Rückriegel, Andreas |
| contents | We show that magnons in two-dimensional altermagnets can spontaneously decay at zero temperature. The decay rate is determined by quantum fluctuations and scattering processes involving the decay of a single magnon into three. These processes are kinematically allowed due to the convexity of the altermagnetic magnon dispersion. For small wavevectors $k$ the decay rate is proportional to $k^5$ with a direction-dependent prefactor which is maximal along the diagonals of the Brillouin zone. Moreover, for a given momentum only magnons with one specific chirality can spontaneously decay. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_19815 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spontaneous magnon decay in two-dimensional altermagnets Cichutek, Niklas Kopietz, Peter Rückriegel, Andreas Strongly Correlated Electrons Mesoscale and Nanoscale Physics We show that magnons in two-dimensional altermagnets can spontaneously decay at zero temperature. The decay rate is determined by quantum fluctuations and scattering processes involving the decay of a single magnon into three. These processes are kinematically allowed due to the convexity of the altermagnetic magnon dispersion. For small wavevectors $k$ the decay rate is proportional to $k^5$ with a direction-dependent prefactor which is maximal along the diagonals of the Brillouin zone. Moreover, for a given momentum only magnons with one specific chirality can spontaneously decay. |
| title | Spontaneous magnon decay in two-dimensional altermagnets |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2502.19815 |