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Semiclassical theory of shot noise in disordered SN contacts

Published in Physical review. B, Condensed matter and materials physics. 2001, vol. 63, no. 8, 081301
Abstract We present a semiclassical theory of shot noise in diffusive superconductor - normal metal contacts. At subgap voltages, we reproduce the doubling of shot noise with respect to conventional normal-metal contacts, which is interpreted in terms of an energy balance of electrons. Above the gap, the voltage dependence of the noise crosses over to the standard one with a voltage-independent excess noise. The semiclassical description of noise leads to correlations between currents at different electrodes of multiterminal SN contacts which are always of fermionic type, i.e. negative. Using a quantum extension of the Boltzmann - Langevin method, we reproduce the peculiarity of noise at the Josephson frequency and obtain an analytical frequency dependence of noise at above-gap voltages.
Keywords Mesoscopic systems and quantum hall effectSuperconductivityCondensed matter
Note SN = superconductor–normal-metal
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NAGAEV, Kirill, BUTTIKER, Markus. Semiclassical theory of shot noise in disordered SN contacts. In: Physical review. B, Condensed matter and materials physics, 2001, vol. 63, n° 8, p. 081301. doi: 10.1103/PhysRevB.63.081301 https://archive-ouverte.unige.ch/unige:4257

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Deposited on : 2009-11-30

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