Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-12-07
Modern Physics Letters B, 19, 2005, 1285
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
1 tar.gz file
Scientific paper
10.1142/S0217984905009250
In metallic nanoparticles, shifts in the ionization energy of surface atoms with respect to bulk atoms can lead to surface bands. Within a simple Tight Binding model we find that the projection of the electronic density of states on these sites presents two overlapping structures. One of them is characterized by the level spacing coming from bulk states and the other arises from the surface states. In very small particles, this contributes to an over-broadening of the NMR absorption spectra, determined by the Knight shift distribution of magnetic nuclei. We compare our calculated Knight shifts with experiments on aluminum nanoparticles, and show that the deviation of the scaling law as a function of temperature and particle size can be explained in terms of surface states.
Gascon J. A.
Pastawski Horacio Miguel
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