Multiple Andreev reflections as a transport problem in energy space
✍ Scribed by Göran Johansson; Göran Wendin; Kateryna N. Bratus’; Vitaly S. Shumeiko
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 149 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0749-6036
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✦ Synopsis
We present an approach for analysing the dc current in voltage biased quantum superconducting junctions. By separating terms from different n-particle processes, we find that the n-particle current can be mapped on the problem of wave transport through a potential structure with n barriers. We discuss the relation between resonances in such structures and the subgap structures in the current-voltage characteristics. At zero temperature we find, exactly, that only processes creating real excitations contribute to the current. Our results are valid for a general SXS junction, where the X region is an arbitrary nonsuperconducting region described by an energy-dependent transfer matrix.