Exact long-wavelength plasmon dispersion on a ring with soft Coulomb interactions. (14th August 2017)

• Record Type: Journal Article
• Authors: Grasselli, Federico; Bertoni, Andrea; Goldoni, Guido
• Is Part Of: Physica scripta. Volume 92:Number 9(2017:Sep.)
• Publication Date: 2017-08-14
• Subjects: ring -- plasmon -- soft Coulomb; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/aa81ef
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: We obtain the analytical dispersion of 1D plasmonic modes on a ring from the exact solution of the hydrodynamical model with soft Coulomb potential. We compare our results with the exact plasmon dispersion in straight 1D systems and find a set of formal correspondences between the two. In light of our results, we discuss recent experiments (Schmidt et al 2014 Nat. Commun. 5 3604) where ring-confined modes in nanodiscs are found to almost coincide with plasmonic excitations in 1D metallic nanostructures. We trace the similarity to the scaling properties of the plasmonic dispersion.