Josephson junction
noun
Jo·seph·son junction ˈjō-zəf-sən- 
also -səf-sən-
: an electronic fast-switching device that consists of two layers of superconducting metal separated by a thin layer of insulator through which low current flows but increased current causes the insulator to block the flow
Word History
Etymology
Brian D. Josephson
First Known Use
1965, in the meaning defined above