Nonlinear electrical conductivity of metal point contacts in the dirty limit

Nonlinear electrical conductivity of dirty metal point contacts is considered for an arbitrary ratio of the electron energy scattering length λε to the contact size d. It is shown that in the absence of phonon reabsorption, the d2I/dV2(V) dependence has clearly manifested spectral properties corresponding to characteristic decreases with increasing ratio d/λε. The dependence of the amplitude of the principal (| eV | = ħω0) and multiphonon (| eV | = ħω0) peaks of the point contact spectrum and background on the ratio d/λε is calculated by using Einstein’s model.

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