Lecture 5 josephson effects
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The document discusses Josephson effects including quasi-particle tunneling, pair tunneling through weak links, and SIS Josephson junctions. It also covers superconducting quantum interference devices (SQUIDS), where Josephson junctions allow supercurrent to flow between two superconductors separated by an insulator, with the current proportional to the difference in phase angles of the superconductors' wave functions. SQUIDS make use of quantum interference in superconducting circuits.
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Lecture 5 josephson effects
- 1. Lecture 5 Josephson Effects •Quasi-particle Tunneling •Pair Tunneling and weak Links •SIS Josephson Junctions •Superconducting Quantum Interference Devices (SQUIDS)
- 25. 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.