Surface magnon-polaritons at a dielectric/graphene/gyromagnetic interface in a perpendicular applied magnetic field.
| Autor: | Dantas LQ; Departamento de Física, Universidade Federal do Rio Grande do Norte, Natal, RN 59072-970, Brazil., Vasconcelos MS; Departamento de Física, Universidade Federal do Rio Grande do Norte, Natal, RN 59072-970, Brazil., Anselmo DHAL; Departamento de Física, Universidade Federal do Rio Grande do Norte, Natal, RN 59072-970, Brazil.; Programa de Pós-Graduação em Física, Universidade do Estado do Rio Grande do Norte, Mossoró, RN 59610-210, Brazil., Cottam MG; Department of Physics and Astronomy, University of Western Ontario, London, ON N6A 3K7, Canada. |
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| Jazyk: | angličtina |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2023 Jun 16; Vol. 35 (37). Date of Electronic Publication: 2023 Jun 16. |
| DOI: | 10.1088/1361-648X/acdc77 |
| Abstrakt: | We present a theoretical study of the surface magnon-polaritons at an interface formed by vacuum and a gyromagnetic medium (that can be either ferromagnetic or antiferromagnetic), when there is a graphene layer deposited between the media at the interface and a magnetic field is applied perpendicular to the interface. The retarded-mode dispersion relations are calculated by considering a superposition of transverse magnetic and transversal electric electromagnetic waves in both media. Our results reveal the appearance of the surface magnon-polariton modes (with frequencies typically of a few GHz) that do not exist in the absence of graphene at the interface. Also, a typical magnon-polariton dispersion relation with damping is revealed, including a resonant frequency that depends on the applied magnetic field. The effects of varying the doping levels, which modify the Fermi energies in the graphene, and varying the perpendicular applied magnetic field are presented, revealing a strong influence exerted by the presence of graphene on the surface magnon-polariton modes. Other effects include the control of the slope of the dispersion curves (with respect to the in-plane wave vector) for the modes as the Fermi energies of the graphene sheet are changed and the distinctive localization properties for the emerging surface modes. (© 2023 IOP Publishing Ltd.) |
| Databáze: | MEDLINE |
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