A model for addition spectra in quantum dots

A simple model for addition spectra in quantum dots is proposed and studied . It is an extension of the standard charging model which assumes that the charge spreads uniformly over the entire dot. The proposed model attempts t o account for a non-uniform distribution of the char,ge by introducing an e xtra parameter U. When U increases, the distribution of the conductance pea k spacings changes from the Wigner-Dyson shape towards a broader, more symm etric distribution.