Giant spatial anisotropy of magnon lifetime in altermagnets
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866918194728402944 |
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| author | Costa, A. T. Henriques, J. C. G. Fernández-Rossier, J. |
| author_facet | Costa, A. T. Henriques, J. C. G. Fernández-Rossier, J. |
| contents | Altermagnets are a new class of magnetic materials with zero net magnetization (like antiferromagnets) but spin-split electronic bands (like ferromagnets) over a fraction of reciprocal space. As in antiferromagnets, magnons in altermagnets come in two flavours, that either add one or remove one unit of spin to the $S=0$ ground state. However, in altermagnets these two magnon modes are non-degenerate along some directions in reciprocal space. Here we show that the lifetime of altermagnetic magnons has a very strong dependence on both flavour and direction. Strikingly, coupling to Stoner modes leads to a complete suppression of magnon propagation along selected spatial directions. This giant anisotropy will impact electronic, spin, and energy transport properties and may be exploited in spintronic applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_12896 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Giant spatial anisotropy of magnon lifetime in altermagnets Costa, A. T. Henriques, J. C. G. Fernández-Rossier, J. Mesoscale and Nanoscale Physics Altermagnets are a new class of magnetic materials with zero net magnetization (like antiferromagnets) but spin-split electronic bands (like ferromagnets) over a fraction of reciprocal space. As in antiferromagnets, magnons in altermagnets come in two flavours, that either add one or remove one unit of spin to the $S=0$ ground state. However, in altermagnets these two magnon modes are non-degenerate along some directions in reciprocal space. Here we show that the lifetime of altermagnetic magnons has a very strong dependence on both flavour and direction. Strikingly, coupling to Stoner modes leads to a complete suppression of magnon propagation along selected spatial directions. This giant anisotropy will impact electronic, spin, and energy transport properties and may be exploited in spintronic applications. |
| title | Giant spatial anisotropy of magnon lifetime in altermagnets |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.12896 |