Abstract
Transport properties on atom-size metallic contacts are studied by combining measurements on conductance and shot noise. Results are presented on fewatom contacts of the monovalent metal gold and the trivalent metal aluminum, as well as on larger gold contacts. The experiments are explained in terms of quantum conductance modes. For a single atom gold contact, shot noise tends to be fully suppressed, indicating that only one mode with transmission of nearly unity contributes to the current. In contrast, the trivalent metal aluminum does not show this property. In larger gold contacts the number of partially transmitted modes continuously grows with the contact size.
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