Multiple Andreev reflections as a transport problem in energy space

Göran Johansson, Göran Wendin, Kateryna N. Bratus, Vltaly S. Shumeiko

Research output: Contribution to journalArticlepeer-review


We present an approach for analyzing 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.

Original languageEnglish
Pages (from-to)905-914
Number of pages10
JournalSuperlattices and Microstructures
Issue number5
StatePublished - May 1999
Externally publishedYes


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