Abstract
A theory of tunneling between a normal metal and a low-carrier-density superconductor at zero temperature is developed. Because of the small Fermi energy of low-carrier-density superconductors and the energy dependence of the tunneling matrix elements for these junctions, the conductance-versus-voltage curves are quite different from those for tunneling between a metal and a high-density (metallic) superconductor. The tunneling displays both the voltage-dependent conductance associated with tunneling between a metal and a degenerate semiconductor and the peaks in conductance arising from the large quasiparticle density of states at voltages slightly larger than the superconducting energy gap.
Published Version
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