Phase and amplitude modes in a superconductor with interlayer pair tunneling

Wen Chin Wu*, A. Griffin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Chakravarty, Sudbø, Anderson, and Strong have introduced a simple model for high Tc oxides based on the effect of Cooper pair tunneling in a bilayer (with strength TJ) with s-wave pairing (g) in the layers. We discuss the order parameter fluctuations of this model. Besides the usual Anderson-Bogoliubov phase and Littlewood-Varma amplitude modes, we find new out-of-phase phase and amplitude modes. Their energy and damping depend critically on whether TJ>g or TJ<g. Such fluctuations in the relative phase and amplitude of two coupled condensates were first discussed in a different system by Leggett in 1966.

Original languageEnglish
Pages (from-to)158-161
Number of pages4
JournalPhysical Review Letters
Issue number1
Publication statusPublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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