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We perform a numerical investigation of the effect of the disorder associatedwith randomly located impurities on shot noise in mesoscopic cavities. We showthat such a disorder becomes dominant in determining the noise behavior whenthe amplitude of the potential fluctuations is comparable to the value of theFermi energy and for a large enough density of impurities. In contrast toexisting conjectures, random potential fluctuations are shown not to contributeto achieving the chaotic regime whose signature is a Fano factor of 1/4, but,rather, to the diffusive behavior typical of disordered conductors. Inparticular, the 1/4 suppression factor expected for a symmetric cavity can beachieved only in high-quality material, with a very low density of impurities.As the disorder strength is increased, a relatively rapid transition of thesuppression factor from 1/4 to values typical of diffusive or quasi-diffusivetransport is observed. Finally, on the basis of a comparison between ahard-wall and a realistic model of the cavity, we conclude that the specificdetails of the confinement potential have a minor influence on noise.

Effect of potential fluctuations on shot noise suppression in mesoscopic cavities