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Frequency-dependent shot noise in long disordered superconductor-normal-metal-superconductor contacts
1Institute of Radioengineering and Electronics, Russian Academy of Sciences, Mokhovaya ulica 11, 103907 Moscow, Russia.
Abstract:
The shot noise in long diffusive superconductor-normal-metal-superconductor contacts is calculated using the semiclassical approach. At low frequencies and for purely elastic scattering, the voltage dependence of the noise is of the form S(I) = (4Delta+2eV)/3R. The electron-electron scattering suppresses the noise at small voltages resulting in vanishing noise yet infinite dS(I)/dV at V = 0. The distribution function of electrons consists of a series of steps, and the frequency dependence of noise exhibits peculiarities at omega = neV, omega = neV-2Delta, and omega = 2Delta-neV for integer n.
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