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Abstract: We explore the collective electromagnetic response in atomic clusters ofvarious sizes and geometries. Our aim is to understand, and hence to control,their dielectric response, based on a fully quantum-mechanical descriptionwhich captures accurately their relevant collective modes. The electronicenergy levels and wave functions, calculated within the tight-binding model,are used to determine the non-local dielectric response function. It is foundthat the system shape, the electron filling and the driving frequency of theexternal electric field strongly control the resonance properties of thecollective excitations in the frequency and spatial domains. Furthermore, it isshown that one can design spatially localized collective excitations byproperly tailoring the nanostructure geometry.



Autor: Rodrigo A. Muniz, Stephan Haas, A.F.J. Levi, Ilya Grigorenko

Fuente: https://arxiv.org/







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