Superconductivity and Josephson Physics
BCS pairing, flux quantization and Josephson nonlinearities.
Explore the 8 concepts
Concept 01BCS superconductivityElectrons form correlated Cooper pairs below a critical temperature.Concept 02Cooper pairs and condensate phaseCooper pairs carry charge two electron charges and support a coherent order-parameter phase.Concept 03London equations and penetration depthSuperconducting screening confines magnetic fields to a penetration layer.Concept 04Flux quantizationThe superconducting phase winds by integer multiples of two pi around a closed loop.Concept 05Josephson effectCoherent Cooper-pair tunneling through a weak link produces nonlinear supercurrent.Concept 06Josephson voltage-phase relationA voltage drives time evolution of the gauge-invariant phase difference.Concept 07Josephson energy and inductanceA junction stores nonlinear potential energy and acts as a tunable inductive element.Concept 08SQUIDs and flux tunabilityTwo junctions in a loop create a flux-dependent effective Josephson energy.