Absence of Luttinger's theorem due to zeros in the single-particle green function

Kiaran B. Dave, Philip W. Phillips, Charles L. Kane

Research output: Contribution to journalArticle

Abstract

We show exactly with an SU(N) interacting model that even if the ambiguity associated with the placement of the chemical potential, μ, for a T=0 gapped system is removed by using the unique value μ(T→0), Luttinger's sum rule is violated even if the ground-state degeneracy is lifted by an infinitesimal hopping. The failure stems from the nonexistence of the Luttinger-Ward functional for a system in which the self-energy diverges. Since it is the existence of the Luttinger-Ward functional that is the basis for Luttinger's theorem which relates the charge density to sign changes of the single-particle Green function, no such theorem exists. Experimental data on the cuprates are presented which show a systematic deviation from the Luttinger count, implying a breakdown of the electron quasiparticle picture in strongly correlated electron matter.

Original languageEnglish (US)
Article number090403
JournalPhysical review letters
Volume110
Issue number9
DOIs
StatePublished - Feb 28 2013

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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