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29 November 2021
 
  » arxiv » cond-mat/0311176

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Phase dependent current statistics in short-arm Andreev interferometer
E.V. Bezuglyi ; E.N. Bratus’ ; V.S. Shumeiko ; V. Vinokur ;
Date 7 Nov 2003
Subject Superconductivity; Mesoscopic Systems and Quantum Hall Effect | cond-mat.supr-con cond-mat.mes-hall
AbstractWe calculate analytically the current statistics for a short diffusive wire between the normal reservoir and a short superconductor-normal metal-superconductor (SNS) junction, at arbitrary applied voltages and temperatures. The cumulant-generating function oscillates with the phase difference $phi$ across the junction, approaching the normal-state value at $phi=pi$. At T=0 and at the applied voltage much smaller than the proximity gap $Delta_phi$, the current noise $P_I$ doubles and the third current cumulant $C_3$ is 4 times larger with respect to their values in the normal state; at $eV gg Delta_phi$ they acquire large excess components. At the gap edge, $eV = Delta_phi$, the effective transferred charge defined through $dP_I/dI$ and $dP_I/dV$ approaches $0e$ and $3e$, respectively, which makes doubtful the interpretation of these quantities as physical elementary transferred charge. At $T eq 0$, $C_3$ shows a non-monotonous voltage dependence with a dip near $eV = Delta_phi$.
Source arXiv, cond-mat/0311176
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