2018/03/25 by L. G. Gerchikov, Gerchikov, Leonid, C. Guet +2
Engineering · Materials Science · #Atomic and Molecular Clusters (physics.atm-clus) #FOS: Physical sciences #Gold and Silver Nanoparticles Synthesis and Applications #Plasmonic and Surface Plasmon Research
paper · pdf · doi:10.48550/arxiv.1803.09355
openalex publication_date 2018/03/25 · openalex created_date 2018/04/06 · openalex updated_date 2026/07/28
Dipole plasmon resonances are ubiquitous in nano-particles with delocalized charge carriers. Doped semi-conductor colloidal nano-crystals constitute a novel paradigm for plasmon excitations in a finite electron system and offer the possibility to tune the carrier density and thus the dipole resonance from visible to infra-red, which cannot be achieved with metallic clusters. Restricting ourselves to highly n-doped ZnO nano-crystals, we explain the observed smooth transition from small sizes dominated by quantum effects to large sizes where the resonance reaches its classical value. A schematic two interacting highly degenerate level quantum model, validated by a full Random Phase Approximation calculation, yields nicely the experimentally observed trends.