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arXiv 1407.4564cond-mat.str-el
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强关联电子系统ARPES线型的一般分析

General analysis of the ARPES line shape for strongly correlated electron systems

S. G. Ovchinnikov, E. I. Shneyder, A. A. Kordyuk

摘要:

在许多情况下,标准微扰法显得过于简单,不能精确描述强关联电子系统的角分辨光电子能谱。特别地,最近引入了基于极端关联费米液体模型的唯象方法来描述在高Tc铜氧化物的光电子能谱中观察到的动量不对称性。本文分析了强关联电子系统中准粒子格林函数的一般结构,强调它不仅由Hubbard准粒子的自能定义,而且由一个强度算符定义。我们表明,后者会对谱函数产生额外的奇动量贡献,并且单独可以解释观察到的不对称性。因此,ARPES谱的不对称性可以作为材料中电子关联强度的一个度量。

英文摘要:

In many cases the standard perturbation approach appears to be too simple to describe precisely the angle resolved photoemission spectrum of strongly correlated electron system. In particular, to describe the momentum asymmetry observed in photoemission spectra of high-Tc cuprates a phenomenological approach based on extremely correlated Fermi-liquid model has been recently introduced. In this paper we analyze the general structure of the Green function of quasiparticles in strongly correlated electron systems and stress that it is defined not only by the self-energy of Hubbard quasiparticles but also by a strength operator. We show that the later leads to an additional odd momentum contribution to the spectral function and alone can explain the observed asymmetry. So, the asymmetry of the ARPES spectra can be a measure of the strength of electron correlations in materials.

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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