Nagaoka相、自旋有效action和离域自由空穴的稳定性
Stability of Nagaoka phase, spin effective action and delocalized free holes
摘要：
在无限$U$极限下的哈伯德模型是在一个投影的从费米子表象中研究的，并且遵循作者和合作者\cite{BFK}以前的工作。通过假设哈伯德模型的巡游磁性存在自旋有效作用量，分析了长冈相相对于空穴非零浓度（$δ_h$）的稳定性.据认为，随着空穴掺杂远离半填充绝缘极限增加，自由空穴预计将更加离域。取决于跳跃的处理：可能出现铁磁或反铁磁有序，长冈相可能相对于$δ_h \neq 0$具有一定的稳定性。
英文摘要：
The Hubbard model in the limit of infinite $U$ is investigated within a projected slave fermion representation and following a previous work of the author and collaborators \cite{BFK}. The stability of the Nagaoka's phase with respect to a non vanishing concentration of holes ($δ_h$) is analyzed by envisaging the existence of a spin effective action for itinerant magnetism of the Hubbard model. It is considered that,as the hole doping increases away from the half filled insulating limit, free holes are expected to be more delocalized. Depending on treatment for the hopping: a ferromagnetic or anti-ferromagnetic ordering might arise and the Nagaoka's phase might have some stability with respect to $δ_h \neq 0$.
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