Nagaev K E
Institute of Radioengineering and Electronics, Russian Academy of Sciences, Mokhovaya ulica 11, 103907 Moscow, Russia.
Phys Rev Lett. 2001 Apr 2;86(14):3112-5. doi: 10.1103/PhysRevLett.86.3112.
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.
利用半经典方法计算了长扩散超导-正常金属-超导接触中的散粒噪声。在低频且仅存在弹性散射的情况下，噪声的电压依赖性形式为S(I) = (4Δ + 2eV)/3R。电子-电子散射在小电压下抑制了噪声，导致噪声消失，但在V = 0时dS(I)/dV无穷大。电子的分布函数由一系列台阶组成，对于整数n，噪声的频率依赖性在ω = neV、ω = neV - 2Δ和ω = 2Δ - neV处表现出特殊性。
