Conductance Channels of Gold Atomic-Size Contacts

Our analysis of the conduction channels shows that the conductance is dominated by a single channel in the last plateau, which corresponds to a single-atom contact or a chain of

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2 Here, primarily the results of the Au-Au contacts are discussed, since in this work the same kind of contact was used... For large contacts the thermovoltage reaches the positive

In contrast, for dots with only a few electrons (large ), the appearance or not of a phase lapse depends on the dot parameters. We show that a model of a multilevel quantum dot

Differential conductance dI/dV as a function of applied magnetic field and bias voltage for a selection of eight contacts of the same sample, measured at low temperature

More than a diameter of the laser spot aside of the contact a small negative LIS is observed, indicating that the thermal expansion of the substrate gives rise to a negative LIS in

Due to this faster decay, the conduction is then dominated by the s orbitals and, since the on-site energy for the minority spins lies further away from the Fermi energy than the

To summarize, the high thermal and mechanical stability and low strain in our electrochemically fabricated atomic- sized lead contacts makes it possible to resolve sharp con-