Noise in an ac biased junction: Nonstationary Aharonov-Bohm effect
- 24 January 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 72 (4) , 538-541
- https://doi.org/10.1103/physrevlett.72.538
Abstract
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.Keywords
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