Plasmon-magnon interactions in two-dimensional honeycomb magnets
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| Main Authors: | , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866929409628307456 |
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| author | Ghosh, Sayandip Menichetti, Guido Katsnelson, Mikhail I. Polini, Marco |
| author_facet | Ghosh, Sayandip Menichetti, Guido Katsnelson, Mikhail I. Polini, Marco |
| contents | Two-dimensional honeycomb ferromagnets offer the unprecedented opportunity to study interactions between collective modes that in standard bulk ferromagnets do not cross paths. Indeed, they harbor an optical spin-wave branch, i.e. a spin wave which disperses weakly near the Brillouin zone center. When doped with free carriers, they also host the typical gapless plasmonic mode of 2D itinerant electron/hole systems. When the plasmon branch meets the optical spin-wave branch, energy and momentum matching occurs, paving the way for interactions between the charge and spin sector. In this Letter we present a microscopic theory of such plasmon-magnon interactions, which is based on a double random phase approximation. We comment on the possibility to unveil this physics in recently isolated 2D honeycomb magnets such as ${\rm Cr}_2{\rm Ge}_2{\rm Te}_6$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2211_11098 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Plasmon-magnon interactions in two-dimensional honeycomb magnets Ghosh, Sayandip Menichetti, Guido Katsnelson, Mikhail I. Polini, Marco Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Two-dimensional honeycomb ferromagnets offer the unprecedented opportunity to study interactions between collective modes that in standard bulk ferromagnets do not cross paths. Indeed, they harbor an optical spin-wave branch, i.e. a spin wave which disperses weakly near the Brillouin zone center. When doped with free carriers, they also host the typical gapless plasmonic mode of 2D itinerant electron/hole systems. When the plasmon branch meets the optical spin-wave branch, energy and momentum matching occurs, paving the way for interactions between the charge and spin sector. In this Letter we present a microscopic theory of such plasmon-magnon interactions, which is based on a double random phase approximation. We comment on the possibility to unveil this physics in recently isolated 2D honeycomb magnets such as ${\rm Cr}_2{\rm Ge}_2{\rm Te}_6$. |
| title | Plasmon-magnon interactions in two-dimensional honeycomb magnets |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2211.11098 |