Lecture 5 josephson effects

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Lecture 5 josephson effects

  1. 1. Lecture 5 Josephson Effects •Quasi-particle Tunneling •Pair Tunneling and weak Links •SIS Josephson Junctions •Superconducting Quantum Interference Devices (SQUIDS)
  2. 2. Quasi-Particle Tunneling
  3. 3. 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.
  4. 4. Superconducting Quantum Interference Devices- SQUIDS

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