Conductance oscillations in a multi-branch Andreev interferometer

W. Lee, Cheol Eui Lee, B. K. Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The conductance, g(ø), of a comb-shaped N-branch Andreev interferometer is calculated as a function of the phase difference, ø, between the adjacent superconducting order parameters. In the ballistic regime, the scattering matrix theory predicts for the conductivity a typical N-branch interference pattern, that is, a 2π-periodic ø dependence with a fine oscillation of the period 2π/(N -1), while for a diffusive system with barriers between the vertices the quasiclassical circuit theory yields a simple 2π-periodic conductance regardless of N. With ensemble averaging in the scattering matrix theory, the fine oscillations get washed out, resulting in a simple π-periodic conductance. In star-shaped interferometers with all the N normal vertices merged into a single vertex, the conductance exhibits similar N-branch interference patterns regardless of whether the conduction is ballistic or diffusive or whether it is ensemble-averaged or not.

Original languageEnglish
Pages (from-to)2019-2025
Number of pages7
JournalJournal of the Korean Physical Society
Volume51
Issue number6
DOIs
Publication statusPublished - 2007 Dec

Keywords

  • Andreev interferometer
  • Conductance oscillation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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