Graphene plasmon-phonon coupled modes at the exceptional point
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2020
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| Acceso en línea: | |
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| _version_ | 1866915920690020352 |
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| author | Park, Sang Hyun Xia, Shengxuan Oh, Sang-Hyun Avouris, Phaedon Low, Tony |
| author_facet | Park, Sang Hyun Xia, Shengxuan Oh, Sang-Hyun Avouris, Phaedon Low, Tony |
| contents | Properties of graphene plasmons are greatly affected by their coupling to phonons. While such coupling has been routinely observed in both near-field and far-field graphene spectroscopy, the interplay between coupling strength and mode losses, and its exceptional point physics has not been discussed. By applying a non-Hermitian framework, we identify the transition point between strong and weak coupling as the exceptional point. Enhanced sensitivity to perturbations near the exceptional point is observed by varying the coupling strength and through gate modulation of the graphene Fermi level. Finally, we also show that the transition from strong to weak coupling is observable by changing the incident angle of radiation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2012_03875 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Graphene plasmon-phonon coupled modes at the exceptional point Park, Sang Hyun Xia, Shengxuan Oh, Sang-Hyun Avouris, Phaedon Low, Tony Mesoscale and Nanoscale Physics Properties of graphene plasmons are greatly affected by their coupling to phonons. While such coupling has been routinely observed in both near-field and far-field graphene spectroscopy, the interplay between coupling strength and mode losses, and its exceptional point physics has not been discussed. By applying a non-Hermitian framework, we identify the transition point between strong and weak coupling as the exceptional point. Enhanced sensitivity to perturbations near the exceptional point is observed by varying the coupling strength and through gate modulation of the graphene Fermi level. Finally, we also show that the transition from strong to weak coupling is observable by changing the incident angle of radiation. |
| title | Graphene plasmon-phonon coupled modes at the exceptional point |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2012.03875 |