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arXiv 1207.4201cond-mat.str-elhep-th
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单粒子格林函数中的零点导致Luttinger定理的缺失

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

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

摘要:

我们精确地用SU(N)相互作用模型表明,即使通过使用唯一值$μ(T\rightarrow 0)$来消除与T=0带隙系统的化学势$μ$的位置相关的模糊性,即使基态简并度被无限小的跳跃解除,也违反了Luttinger求和规则。失败源于不存在的Luttinger-Ward功能的系统中的自能发散。由于Luttinger-Ward泛函的存在是Luttinger定理的基础,该定理将电荷密度与单粒子格林函数的符号变化联系起来,因此不存在这样的定理。铜酸盐的实验数据显示,从Luttinger计数的系统偏差,这意味着击穿的电子准粒子图片在强关联电子的问题。

英文摘要:

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 $μ(T\rightarrow 0)$, Luttinger's sum rule is violated even if the ground-state degeneracy is lifted by an infinitesimal hopping. The failure stems from the non-existence 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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