Absence of Luttinger’s Theorem due to Zeros in the Single-Particle Green Function

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Physical Sciences and Mathematics
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Dave, Kiaran B
Phillips, Philip W
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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.

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2013-02-28
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Dave, K. B., Phillips, P. W., & Kane, C. L. (2013). Absence of Luttinger’s Theorem due to Zeros in the Single-Particle Green Function. Physical Review Letters, 110(9), 090403. doi: http://dx.doi.org/10.1103/PhysRevLett.110.090403 © 2013 American Physical Society
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