Noise in an ac biased junction. Non-stationary Aharonov-Bohm effect

Details Noise in an ac biased junction. Non-stationary Aharonov-Bohm effect Noise in an ac biased junction. Non-stationary Aharonov-Bohm effect

1993-11-19

arxiv.org/abs/cond-mat/9311048v1

Phys. Rev. Lett. 72, 538 (1994)

Physics

Condensed Matter

10 pages, RevTeX 3.0, figures by request

Scientific paper

10.1103/PhysRevLett.72.538

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.

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