We have measured the electronic energy spectra of nm-scale Au particles using a new tunneling spectroscopy configuration. The particle diameters ranged from 5nm to 9nm, and at low energies the spectrum is discrete, as expected by the electron-in-a-box model. The density of tunneling resonances increases rapidly with energy, and at higher energies the resonances overlap forming broad resonances. Near the Thouless energy, the broad resonances merge into a continuum. The tunneling resonances display Zeeman splitting in a magnetic field. Surprisingly, the g-factors (~0.3) of energy levels in Au nano-particles are much smaller than the g-factor (2.1) in bulk gold.
@article{arxiv.cond-mat/9905043,
title = {Spectroscopy, Interactions and Level Splittings in Au Nanoparticles},
author = {D. Davidovic and M. Tinkham},
journal= {arXiv preprint arXiv:cond-mat/9905043},
year = {2009}
}