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Thin-film Plasmonics at the Surface of a Topological Insulator | | Thomas Benjamin Smith
; Iacopo Torre
; Alessandro Principi
; | | Date: |
20 Dec 2018 | | Abstract: | We study plasmon propagation at the surface of a 3D topological insulator
partially coated with a thin film of magnetic material. The resulting three
regions, separated by two sharp interfaces, are characterised by different Hall
conductivities but identical normal conductivities. A single undamped bound
mode is found, which can localise to either interface and has an asymmetric
potential profile across the region. For propagating modes, we calculate the
reflection and transmission coefficients through the magnetic region. We find
Airy transmission patterns with sharp maxima and minima as a function of the
plasmon incidence angle. The system therefore behaves as a high-quality filter. | | Source: | arXiv, 1812.8798 | | Services: | Forum | Review | PDF | Favorites | |
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