Size-effects in the Density of States in NS and SNS junctions

Details Size-effects in the Density of States in NS and SNS junctions Size-effects in the Density of States in NS and SNS junctions

1996-05-13

arxiv.org/abs/cond-mat/9605078v1

Phys. Rev. B 54, 4283 (1996).

Physics

Condensed Matter

9 pages, RevTex, 5 figures, accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.54.4283

The quasiparticle local density of states (LDOS) is studied in clean NS and 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.

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