Why does a metal-superconductor junction have a resistance?

Details Why does a metal-superconductor junction have a resistance? Why does a metal-superconductor junction have a resistance?

1999-09-20

arxiv.org/abs/cond-mat/9909293v2

Quantum Mesoscopic Phenomena and Mesoscopic Devices in Microelectronics, edited by I.O. Kulik and R. Ellialtioglu, NATO Scienc

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 5 postscript figures [v2: all figures inline]

Scientific paper

This is a tutorial article based on a lecture delivered in June 1999 at the NATO Advanced Study Institute in Ankara. The phenomenon of Andreev reflection is introduced as the electronic analogue of optical phase-conjugation. In the optical problem, a disordered medium backed by a phase-conjugating mirror can become completely transparent. Yet, a disordered metal connected to a superconductor has the same resistance as in the normal state. The resolution of this paradox teaches us a fundamental difference between phase conjugation of light and electrons.

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