Non-Abelian bosonization and topological aspects of BCS systems

Anupam Garg*, V. P. Nair, Michael Stone

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

It is shown that many features of the low energy behaviour of weak coupling BCS systems are topological in character. This is done by writing the BCS action as a Fermi surface sum of (1 + 1)-dimentional non-Abelian actions, each one of which can be bosonized à la Witten. This process leads to the correct current generating parts (as found by Cross) in the effective action for the gap function, and in addition a Wess-Zumino term. The mass and spin currents are calculated for the three-dimensional theory, and it is shown that upon averaging over all directions on the Fermi surface, the contribution from the Wess-Zumino term vanishes for a pure spin singlet or pure spin triplet gap, but not otherwise.

Original languageEnglish (US)
Pages (from-to)149-162
Number of pages14
JournalAnnals of Physics
Volume173
Issue number1
DOIs
StatePublished - Jan 1987

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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