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Excess Noise in Biased Superconducting Weak Links | | J.P. Hessling
; V.S. Shumeiko
; Yu.M. Galperin
; G. Wendin
; | | Date: |
5 Sep 1995 | | Subject: | cond-mat | | Abstract: | Non-equilibrium excess noise of a short quasi one-dimensional constriction between two superconductors is considered. A general expression for the current-current correlation function valid for arbitrary temperatures and bias voltages is derived. This formalism is applied to a current-carrying quantum channel with perfect transparency. Contrary to a transparent channel separating two normal conductors, a weak link between two superconductors exhibits a finite level of noise. The source of noise is fractional Andreev scattering of quasiparticles with energies $|E|$ greater than the half-width $Delta$ of the superconducting gap. For high bias voltages, $V gg Delta /e$, the relation between the zero-frequency limit of the noise spectrum, $S(0)$, and the excess current $I_{ ext{exc}}$ reads $S(0)=(1/5)|e|I_{ ext{exc}}$. As $Delta
ightarrow 0$ both the excess noise and the excess current vanish linearly in $Delta$, %$propto Delta$, their ratio being constant. | | Source: | arXiv, cond-mat/9509018 | | Services: | Forum | Review | PDF | Favorites | |
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