Supercurrent Spectroscopy of Andreev States
Supercurrent Spectroscopy of Andreev States
When two superconductors are connected through a weak link, discrete quasiparticle states localized at the link, called Andreev levels, are known to appear and leave their signatures in a ``supercurrent'' that flows through the link. Using microwave excitation and supercurrent measurements, scientists reveal the fundamental nature of the Andreev levels …