Quasiparticle distribution in a superconductor–normal-material–superconductor junction in the clean limit
Yukio Tanaka, Masaru Tsukada
DOI 10.1103/PhysRevB.47.287 · Physical Review B
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Abstract
In order to study the spatial distribution of quasiparticles in a superconductor–normal-metal–superconductor (S/N/S) junction, the tunneling conductance dI/dV is calculated with use of a pair potential determined self-consistently in numerical calculations. The interference between electronlike and holelike quasiparticles is found to cause a spatial change of dI/dV in the N region, the scale of which is of order of the decay length of the pair potential. For an attractive interelectron potential in the N region, quasiparticles with energy below the bound state are predominantly found in the middle of the N region; for a repulsive interelectron potential, they are predominantly found at the interface. The sign of the interelectron potential in the N region can be distinguished by performing a scanning-tunneling-microscopy experiment in which both S and N materials have nearly equal Fermi momenta.
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