Frequency-Dependent Shot Noise in Long Disordered Superconductor–Normal-Metal–Superconductor Contacts
K. E. Nagaev
DOI 10.1103/PhysRevLett.86.3112 · Physical Review Letters
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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 SI=(4Δ+2eV)/3R. The electron-electron scattering suppresses the noise at small voltages resulting in vanishing noise yet infinite dSI/dV at V=0. The distribution function of electrons consists of a series of steps, and the frequency dependence of noise exhibits peculiarities at ω=neV, ω=neV−2Δ, and ω=2Δ−neV for integer n.
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