Critical current of a ballistic asymmetric SNSNS junction

Victor C.Y. Chang*, Chon-Saar Chu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The critical current through an asymmetrically stacked, double superconductor-normal-metal-superconductor (SNS) junction is studied in the mesoscopic and ballistic regime. The asymmetry in such SNSNS junctions excludes any intuitive choice for the phase φ2 of the middle superconductor S2. We propose to determine φ2 from the condition that the currents in the two normal regions are the same. The Bogoliubov-de Gennes equation is solved analytically within the Andreev approximation. In the long S2 limit, we find that the current-phase relation (CPR) can be constructed directly from the CPRs of the two constituent SNS junctions, of which the longer SNS junction imposes a cutoff to the critical current. In short S2 cases, the cutoff feature remains, but the cutoff value is affected by the Andreev-level tunneling. The dependencies of the SNSNS critical current on the length of S2, and the asymmetry in the configuration are studied.

Original languageEnglish
Pages (from-to)433-438
Number of pages6
JournalSolid State Communications
Issue number8
StatePublished - 22 Jul 1998


  • A. Nanostructures
  • A. Superconductors
  • D. Electronic transport
  • D. Tunneling

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