lecture 5 josephson effects
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Lecture 5 Josephson Effects
•Quasi-particle Tunneling
•Pair Tunneling and weak Links
•SIS Josephson Junctions
•Superconducting Quantum Interference Devices (SQUIDS)
Quasi-Particle Tunneling
Josephson effect
(see also hand-out)
In 1962 Josephson predicted Cooper-pairs can tunnel through a weak link at zero voltage difference. Current in junction (called Josephson junction – Jj) is then equal to:
21sin cJJ
Electrical current flows between two SC materials - even when they are separated by a non-SC or insulator. Electrons "tunnel" through this non-SC region, and SC current flows.
Superconducting Quantum Interference Devices-
SQUIDS
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