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Non-equilibrium noise in a mesoscopic conductor: microscopic analysis | | B. L. Altshuler
; L. S. Levitov
; A. Yu. Yakovets
; | | Date: |
23 May 1994 | | Journal: | JETP Lett. 59, 857 (1994) | | Subject: | cond-mat | | Abstract: | 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 Büttiker. | | Source: | arXiv, cond-mat/9405061 | | Services: | Forum | Review | PDF | Favorites | |
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