Far-infrared absorption in ultrafine Al particles
Abstract
The first far-infrared measurements on metallic particles with diameters < 10 nm are reported. The absorptivity is well approximated by αexp~Cexpν~2, where 3<ν~<150 cm-1. The results are compared with the Gor'kov-Eliashberg (GE) theory of particles with quantized electronic levels as well as with the classical Drude theory. When a size distribution is included, αGE=CGEν~2 irrespective of level statistics. However, Cexp>>CGE and the observed dependence on the diameter is directly contrary to predictions of the GE theory. Neither can the data be reconciled with the classical theory.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 1976
- DOI:
- 10.1103/PhysRevLett.37.625
- Bibcode:
- 1976PhRvL..37..625G