Nonlinear Transport through NS Junctions due to Imperfect Andreev Reflection

Details Nonlinear Transport through NS Junctions due to Imperfect Andreev Reflection Nonlinear Transport through NS Junctions due to Imperfect Andreev Reflection

1998-07-13

arxiv.org/abs/cond-mat/9807178v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, RevTeX, three postscript figures

Scientific paper

10.1134/1.567914

We investigate a normal metal -- superconductor (point) contact in the limit where the number of conducting channels in the metallic wire is reduced to few channels. As the effective Fermi energy drops below the gap energy, a conducting band with a width twice the Fermi energy is formed. Depending on the mode of operation, the conduction band can be further squeezed, leading to various non-linear effects in the current-voltage characteristics such as current saturation, a N-shaped negative differential resistance, bistability, and hysteresis.

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