Positive and negative Hanbury-Brown and Twiss correlations in normal metal-superconducting devices |
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Authors: | J Torrès T Martin |
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Institution: | (1) Centre de Physique Théorique, Université de la Méditerranée, Case 907, 13288 Marseille Cedex 9, France, FR |
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Abstract: | In the light of the recent analogs of the Hanbury-Brown and Twiss experiments 1] in mesoscopic beam splitters, negative current
noise correlations are recalled to be the consequence of an exclusion principle. Here, positive (bosonic) correlations are
shown to exist in a fermionic system, composed of a superconductor connected to two normal reservoirs. In the Andreev regime,
the correlations can either be positive or negative depending on the reflection coefficient of the beam splitter. For biases
beyond the gap, the transmission of quasiparticles favors fermionic correlations. The presence of disorder enhances positive
noise correlations. Potential experimental applications are discussed.
Received 1 June 1999 |
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Keywords: | PACS 74 40 +k Fluctuations (noise chaos nonequilibrium superconductivity localization etc ) - 74 50 +r Proximity effects weak links tunneling phenomena and Josephson effects - 72 70 +m Noise processes and phenomena |
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