Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-11-19
Superlattices Microstruct. 25, 925 (1999)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, revtex, 8 figures, submitted to a special issue of Superlattices and Microstructures
Scientific paper
10.1006/spmi.1999.0744
We discuss the general transport properties of superconducting quantum point contacts. We show how these properties can be obtained from a microscopic model using nonequilibrium Green function techniques. For the case of a one-channel contact we analyze the response under different biasing conditions: constant applied voltage, current bias and microwave-induced transport. Current fluctuations are also analyzed with particular emphasis on thermal and shot-noise. Finally, the case of superconducting transport through a resonant level is discussed. The calculated properties show a remarkable agreement with the available experimental data from atomic-size contacts measurements. We suggest the possibility of extending this comparison to several other predictions of the theory.
Cuevas Juan Carlos
Martín-Rodero Alvaro
Yeyati Alfredo Levy
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