Collective magnetic excitations in AA- And AB-stacked graphene bilayers
We discuss novel transverse plasmon polaritons that are hosted by AA- and AB-stacked bilayer graphene due to perfect nesting. They are composed of oscillating counterflow currents in between the layers, giving a clear interpretation of these collective modes as magnetic excitations carrying magnetic...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/705094 |
| Acceso en línea: | http://hdl.handle.net/10486/705094 https://dx.doi.org/10.1103/PhysRevB.104.245412 |
| Access Level: | acceso abierto |
| Palabra clave: | Bilayer Graphene Collective Magnetic Excitations Collective Modes Counterflow Graphene Bilayers Magnetic Excitations Neutrality Point Plasmon-Polaritons Zero Frequency Física |
| Sumario: | We discuss novel transverse plasmon polaritons that are hosted by AA- and AB-stacked bilayer graphene due to perfect nesting. They are composed of oscillating counterflow currents in between the layers, giving a clear interpretation of these collective modes as magnetic excitations carrying magnetic moments parallel to the planes. For AA-stacked bilayer graphene, these modes can reach zero frequency at the neutrality point and we thus predict a symmetry-broken ground state leading to in-plane orbital ferromagnetism. Even though it could be hard to detect them in real solid-state devices, these novel magnetic plasmons should be observable in artificial setups such as optical lattices. Also, our results might be relevant for magic angle twisted bilayer graphene samples, as their electronic properties are mostly determined by confined AA-stacked regions |
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