Phase Sensitive Shot Noise in an Andreev Interferometer
| Autor: | Wolfgang Belzig, Bertrand Reulet, Yuli V. Nazarov, A. A. Kozhevnikov, Daniel E. Prober |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
FOS: Physical sciences
General Physics and Astronomy 02 engineering and technology Electron pacs:42.50.Lc 01 natural sciences Andreev reflection Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences ddc:530 010306 general physics Physics Superconductivity Mesoscopic physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics pacs:72.70.+m Supercurrent Shot noise pacs:05.40.-a Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Interferometry pacs:73.23.-b 0210 nano-technology Coherence (physics) |
| Zdroj: | Physical Review Letters, 90 (6) Scopus-Elsevier |
| ISSN: | 1079-7114 |
| Popis: | 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 interprete as due to pair correlations. Experimental data are in good agreement with theoretical predictions based on an extended Keldysh Green's function approach. Comment: 4 pages, 3 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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