Home
For authors
Submission status

Current
Archive
Archive (English)
   Volumes 21-40
   Volumes 1-20
   Volumes 41-62
      Volume 62
      Volume 61
      Volume 60
      Volume 59
      Volume 58
      Volume 57
      Volume 56
      Volume 55
      Volume 54
      Volume 53
      Volume 52
      Volume 51
      Volume 50
      Volume 49
      Volume 48
      Volume 47
      Volume 46
      Volume 45
      Volume 44
      Volume 43
      Volume 42
      Volume 41
Search
VOLUME 59 (1994) | ISSUE 12 | PAGE 821
Nonequilibrium noise in a mesoscopic conductor: A microscopic analysis
Current fluctuations are studied in a mesoscopic conductor using the nonequilibrium Keldysh technique. A general expression is derived for the fluctuations in the presence of a time-dependent voltage, which is valid for arbitrary relation between voltage and temperature. Two limits are then considered: a voltage pulse and a dc voltage. A voltage pulse causes phase-sensitive current fluctuations, for which we derive microscopically an expression periodic in fV(t)dt with a period hie. 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 obtain quantum-to-classical shot noise reduction factor 1/3, in agreement with recent results of Beenakker and Biittiker.