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Phase sensitive shot noise in an Andreev interferometer | | B Reulet
; A A Kozhevnikov
; D E Prober
; W Belzig
; Yu V Nazarov
; | | Date: |
14 Feb 2003 | | Journal: | Phys Rev Lett, 90 (6), 066601 | | Abstract: | We investigate nonequilibrium noise in a diffusive Andreev interferometer, in which currents emerging from two normal metal/superconductor (N-S) interfaces can interfere. We observe a modulation of the shot noise when the phase difference between the two N-S interfaces is varied by a magnetic flux. This is the signature of phase-sensitive fluctuations in the normal metal. The effective charge inferred from the shot noise measurement is close to q(eff) = 2e but shows phase-dependent deviations from 2e at finite energy, which we interpret as being due to pair correlations. Experimental data are in good agreement with predictions based on an extended Keldysh Green’s function approach. | | Source: | PubMed, pmid12633314 | | Services: | Forum | Review | Favorites | |
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