%0 Journal Article
%T Noise in an ac biased junction. Non-stationary Aharonov-Bohm effect
%A L. S. Levitov
%A G. B. Lesovik
%J Physics
%D 1993
%I arXiv
%R 10.1103/PhysRevLett.72.538
%X We study excess noise in a quantum conductor in the presence of constant voltage and alternating external field. Due to a two particle interference effect caused by Fermi correlations the noise is sensitive to the phase of the time dependent transmission amplitude. We compute spectral density and show that at T=0 the noise has singular dependence on the {\rm dc} voltage $V$ and the {\rm ac} frequency $\Omega$ with cusplike singularities at integer $eV/\hbar\Omega$. For a metallic loop with an alternating flux the phase sensitivity leads to an oscillating dependence of the strengths of the cusps on the flux amplitude.
%U http://arxiv.org/abs/cond-mat/9311048v1