Noise in an ac biased junction: Nonstationary Aharonov-Bohm effect

Phys. Rev. Lett. 72, 538 – Published 24 January 1994
G. B. Lesovik and L. S. Levitov


We study excess noise in a quantum conductor in the presence of constant voltage and alternating external field. Becasue of 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 dc voltage V and the ac frequency Ω with cusplike singularities at integer eV/ħΩ. For a metallic loop with an alternating flux the phase sensitivity leads to an oscillating dependence of the strength of the cusps on the flux amplitude.


  • Received 26 July 1993
  • Published in the issue dated 24 January 1994

© 1994 The American Physical Society

Authors & Affiliations

G. B. Lesovik and L. S. Levitov

  • Universität zu Köln, Institut für Theoretische Physik, Zülpicher Strasse 77, D-5000 Köln 41, Germany
  • Massachusetts Institute of Technology, 12-112, Department of Physics, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139

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