Size effects in the density of states in normal-metal{endash}superconductor and superconductor{endash}normal-metal{endash}superconductor junctions
- Faculteit Natuurkunde en Sterrenkunde, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam (The Netherlands)
The quasiparticle local density of states (LDOS) is studied in clean normal-metal{endash}superconductor (NS) and superconductor{endash}normal-metal{endash}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. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 286698
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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