Non-equilibrium noise in a mesoscopic conductor: microscopic analysis

Details Non-equilibrium noise in a mesoscopic conductor: microscopic analysis Non-equilibrium noise in a mesoscopic conductor: microscopic analysis

1994-05-23

arxiv.org/abs/cond-mat/9405061v1

JETP Lett. 59, 857 (1994)

Physics

Condensed Matter

6 pages, figures by request, RevTeX, Landau Institute preprint 261/6437

Scientific paper

Current fluctuations are studied in a mesoscopic conductor using non-equilibrium Keldysh technique. We derive a general expression for the fluctuations in the presence of a time dependent voltage, valid for arbitrary relation between voltage and temperature. Two limits are then treated: a pulse of voltage and a DC voltage. A pulse of voltage causes phase sensitive current fluctuations for which we derive microscopically an expression periodic in $\int V(t)dt$ with the period $h/e$. Applied to current fluctuations in Josephson circuits caused by phase slips, it gives an anomalous contribution to the noise with a logarithmic singularity near the critical current. In the DC case, we get quantum to classical shot noise reduction factor 1/3, in agreement with recent results of Beenakker and B\"uttiker.

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