Orbital selective phase transition
Orbital selective phase transition
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DOI：
10.1142/s0217984913300159
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
Yao Yao-Yao;Yu-Zhong Zhang;Hunpyo Lee;H. Jeschke;R. Valentí;Hai-Qing Lin;Chang-qin Wu
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文献类型：
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作者：
Yao Yao-Yao;Yu-Zhong Zhang;Hunpyo Lee;H. Jeschke;R. Valentí;Hai-Qing Lin;Chang-qin Wu
在本文中，我们回顾了理论研究的起源的轨道选择性阶段，本地化和巡回电子共存的d壳层在中间强度的现场库仑电子之间的相互作用。特别讨论了空间涨落对不等带宽双轨道Hubbard模型相图的影响。重点讨论了不同轨道上不同的能带色散以及不同轨道上不同的磁有序态对轨道选择性相变的影响。这是因为这两种机制独立于洪德规则耦合，并且完全不同于其他众所周知的机制，如不等带宽的轨道和具有不同简并度的轨道。此外，晶场分裂是不需要在这两个最近提出的机制。
In this paper, we review theoretical investigations on the origin of the orbital selective phase where localized and itinerant electrons coexist in the d shell at intermediate strength of the on-site Coulomb interactions between electrons. In particular, the effect of spatial fluctuations on the phase diagram of the two-orbital Hubbard model with unequal bandwidths is discussed. And different band dispersions in different orbitals as well as different magnetically ordered states in different orbitals which are responsible for orbital selective phase transitions are emphasized. This is due to the fact that these two mechanisms are independent of the Hund’s rule coupling, and are completely distinct from other well-known mechanisms like orbitals of unequal bandwidths and orbitals with different degeneracies. Moreover, crystal field splitting is not required in these two recently proposed mechanisms.