By Andreas Schmitt
Superfluidity – and heavily with regards to it, superconductivity – are very basic phenomena which may take place on tremendously assorted power scales. Their underlying theoretical mechanism of spontaneous symmetry breaking is much more basic and applies to a large number of actual systems.
In those lecture notes, a pedagogical advent to the field-theory method of superfluidity is gifted. the relationship to extra conventional ways, usually formulated in a special language, is thoroughly defined with a purpose to supply a constant photograph that's worthy for college kids and researchers in all fields of physics.
After introducing the elemental techniques, corresponding to the two-fluid version and the Goldstone mode, chosen issues of present examine are addressed, equivalent to the BCS-BEC crossover and Cooper pairing with mismatched Fermi momenta.
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