SU(2) gauge invariance and order parameters in strongly coupled electronic systems

Elbio Dagotto, Eduardo Fradkin, Adriana Moreo

Research output: Contribution to journalArticlepeer-review

Abstract

We show that the spin- Heisenberg model (the strong-coupling limit of the Hubbard model) is also the strong-coupling limit of an SU(2) lattice gauge theory with fermions. The local SU(2) gauge symmetry is manifest. The role of this gauge invariance is investigated in both the Hamiltonian and path-integral formulations. Off half-filling, our results reveal the existence of a lattice SU(2) bosonic matrix field which is a natural candidate for a condensate order parameter.

Original languageEnglish (US)
Pages (from-to)2926-2929
Number of pages4
JournalPhysical Review B
Volume38
Issue number4
DOIs
StatePublished - 1988

ASJC Scopus subject areas

  • Condensed Matter Physics

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