Size effects in the density of states in normal-metal–superconductor and superconductor–normal-metal–superconductor junctions
M. Blaauboer, R. T. W. Koperdraad, A. Lodder, D. Lenstra
DOI 10.1103/PhysRevB.54.4283 · Physical Review B
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Abstract
The quasiparticle local density of states (LDOS) is studied in clean normal-metal–superconductor (NS) and superconductor–normal-metal–superconductor (SNS) junctions with increasing transverse size, from quasi-one-dimensional to three-dimensional. It is shown that finite transverse dimensions are related to pronounced effects in the LDOS, such as fast oscillations superimposed on the quasiparticle interference oscillations (for NS) and additional peaks in the bound state spectrum in the subgap region (for SNS). Also, the validity of the Andreev approximation is discussed. It turns out to be an acceptable approximation in all situations tested. © 1996 The American Physical Society.
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