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← ScienceWhich outcome occurs when a Josephson junction connecting two superconductors has a thin insulating barrier?
A)Cooper pair tunneling across the barrier✓
B)Complete reflection of electron waves
C)Classical electron flow due to bias volts
D)Thermal breakdown of the insulating film
💡 Explanation
When a Josephson junction has a thin insulating barrier (potential barrier), quantum tunneling of Cooper pairs occurs because their wave functions have a non-zero probability of penetrating the barrier, leading to supercurrent flow. Therefore Cooper pair tunneling results, rather than reflection, ohmic flow, or breakdown, require higher voltage or thicker/defective barriers.
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