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Ge/Si core/shell nanowire heterostructures, when coupled to superconducting leads, are tunable mesoscopic Josephson junctions. The underlying plot is a map of the differential conductance as a function of both gate and source-drain voltage, with multiple Andreev reflections giving rise to the observed pattern.
Andy Vidan, MIT Lincoln Laboratory. Nature Nanotechnology 1, 208 (2006).
Image courtesy: Dr. Andy Vidan, MIT Lincoln Laboratory