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arXiv cond-mat/0111368cond-mat.str-el
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哈伯德模型的ARPES谱

ARPES Spectra of the Hubbard model

Th. A. Maier, Th. Pruschke, M. Jarrell

摘要:

我们讨论了在中间耦合区用动力学集团近似计算的二维哈伯德模型的谱,这是一种非微扰方法。我们发现了一个交叉从一个正常的费米液体与费米表面周围的布里渊区中心封闭在大掺杂的非费米液体小掺杂。这种交叉是由2D布里渊区的$X$点周围的费米面分裂发出的信号,这最终导致了围绕点M闭合的类空穴费米面。在低掺杂的费米面的拓扑结构表明违反了Luttinger定理。我们讨论了不同的方式提出的光谱数据提取信息的费米面。与最近的实验进行比较。

英文摘要:

We discuss spectra calculated for the 2D Hubbard model in the intermediate coupling regime with the dynamical cluster approximation, which is a non-perturbative approach. We find a crossover from a normal Fermi liquid with a Fermi surface closed around the Brillouin zone center at large doping to a non-Fermi liquid for small doping. The crossover is signalled by a splitting of the Fermi surface around the $X$ point of the 2D Brillouin zone, which eventually leads to a hole-like Fermi surface closed around the point M. The topology of the Fermi surface at low doping indicates a violation of Luttinger's theorem. We discuss different ways of presenting the spectral data to extract information about the Fermi surface. A comparison to recent experiments will be presented.

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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