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arXiv 1703.01807cond-mat.str-el
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费米液体与Luttinger积分

Fermi Liquids and the Luttinger Integral

O. J. Curtin, Y. Nishikawa, A. C. Hewson, D. J. G. Crow

摘要:

Luttinger定理是费米液体的基本特征之一,它将巡游电子系统中的电子密度与费米面的体积联系起来。这个结果的微观推导依赖于某个积分的消失,即Luttinger积分$I_{\rm L}$,它也是杂质模型的Friedel求和规则的基础,将杂质占据数与传导电子的散射相移联系起来。已知$I_{\rm L}$与$I_{\rm L}=\pmπ/2$的非零值出现在具有非解析低能散射的相中的杂质模型中,被分类为奇异费米液体。在这里,我们表明,相同的值,$I_{\rm L}=\pmπ/2$,发生在杂质模型中的阶段与规则的低能费米液体行为。因此,Luttinger积分可以用来表征这些相位,而将它们分开的量子临界点被解释为拓扑的。

英文摘要:

The Luttinger Theorem, which relates the electron density to the volume of the Fermi surface in an itinerant electron system, is taken to be one of the essential features of a Fermi liquid. The microscopic derivation of this result depends on the vanishing of a certain integral, the Luttinger integral $I_{\rm L}$, which is also the basis of the Friedel sum rule for impurity models, relating the impurity occupation number to the scattering phase shift of the conduction electrons. It is known that non-zero values of $I_{\rm L}$ with $I_{\rm L}=\pmπ/2$, occur in impurity models in phases with non-analytic low energy scattering, classified as singular Fermi liquids. Here we show the same values, $I_{\rm L}=\pmπ/2$, occur in an impurity model in phases with regular low energy Fermi liquid behavior. Consequently the Luttinger integral can be taken to characterize these phases, and the quantum critical points separating them interpreted as topological.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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