Phys. Rev. Lett. 87, 067006 (2001) [4 pages]Full Current Statistics in Diffusive Normal-Superconductor Structures |
W. Belzig * and Yu. V. Nazarov
Department of Applied Physics and Delft Institute of Microelectronics and Submicrontechnology, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
Received 2 February 2001; published 23 July 2001
We study the current statistics in normal diffusive conductors in contact with a superconductor. Using an extension of the Keldysh Green's function method we are able to find the full distribution of charge transfers for all temperatures and voltages. For the non-Gaussian regime, we show that the equilibrium current fluctuations are enhanced by the presence of the superconductor. We predict an enhancement of the nonequilibrium current noise for temperatures below and voltages of the order of the Thouless energy ETh = D/L2. Our calculation fully accounts for the proximity effect in the normal metal and agrees with experimental data.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v87/e067006
DOI: 10.1103/PhysRevLett.87.067006
PACS: 74.50.+r, 05.40.-a, 72.70.+m, 73.23.-b
* Present address: Institute of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.
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