Thursday, February 25, 2016

quantum mechanics - How does current flow in superconductors if Cooper pairs have zero momentum?


I've been reading a lot of condensed matter textbooks, which state both that the net momentum of a Cooper pair in a superconductor is zero, and that Cooper pairs have momentum when they carry current.


How can these two statements be consistent? If a Cooper pair has zero momentum, how can current flow in a superconductor?




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