Pnictides中自旋序引发的轨道重分布
Orbital-weight redistribution triggered by spin order in the pnictides
摘要：
本文在三轨道模型下研究了铁基超导体中未掺杂母体化合物的单粒子谱函数及其轨道组成。在实际的参数范围内，结果与实验数据最吻合，观察到xz和yz轨道上的磁化强度明显不同，费米面主要呈现xz特征，正如最近在光电发射实验中观察到的那样[T. Shimojima等人，物理修订信函104，057002（2010）]。由于在这个区域中的铁轨道顺序最多是百分之几，这些结果主要是由磁序驱动的。对五轨道模型的类似分析得出了类似的结论。
英文摘要：
The one-particle spectral function and its orbital composition are investigated in a three-orbital model for the undoped parent compounds of the iron-based superconductors. In the realistic parameter regime, where results best fit experimental data, it is observed that the magnetization in the xz and yz orbitals are markedly different and the Fermi surface presents mostly xz character, as recently observed in photoemission experiments [T. Shimojima et al., Phys. Rev. Lett. 104, 057002 (2010)]. Since the ferro-orbital order in this regime is at most a few percent, these results are mainly driven by the magnetic order. An analogous analysis for a five-orbital model leads to similar conclusions.
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