Semiclassical theory of shot noise in disordered SN contacts

Details Semiclassical theory of shot noise in disordered SN contacts Semiclassical theory of shot noise in disordered SN contacts

2000-07-07

arxiv.org/abs/cond-mat/0007121v1

Phys. Rev. B 63, 081301(R) (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages RevTeX, 1 eps figure

Scientific paper

10.1103/PhysRevB.63.081301

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.

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