Orbital Selectivity Enhanced by Nematic Order in FeSe
Orbital Selectivity Enhanced by Nematic Order in FeSe
复制标题
FeSe 中向列有序增强的轨道选择性
DOI：
10.1103/physrevlett.121.227003
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发表时间：
2018
影响因子：
8.6
通讯作者：
Si Qimiao
中科院分区：
文献类型：
--
作者：
Yu Rong;Zhu Jian Xin;Si Qimiao
受最近的低温实验的启发，我们在多轨道模型下用自旋理论研究了FeSe体相的电子关联效应。我们发现，一个有限的π阶有助于稳定的轨道选择莫特阶段。此外，我们提出，当与波键的键序与铁轨道序相结合，有一个令人惊讶的大轨道之间的选择性和轨道，即使相关的带分裂是相对较小的。我们的研究结果解释了FeSe的α相中强轨道选择性的看似不寻常的观察结果，揭示了α有序性质的新线索，并为阐明铁基超导体中超导性和向列性之间的相互作用奠定了基础。
Motivated by the recent low-temperature experiments on bulk FeSe, we study the electron correlation effects in a multiorbital model for this compound in the nematic phase using theslave-spin theory. We find that a finite nematic order helps to stabilize an orbital selective Mott phase. Moreover, we propose that when the- and-wave bond nematic orders are combined with the ferro-orbital order, there exists a surprisingly large orbital selectivity between theandorbitals even though the associated band splitting is relatively small. Our results explain the seemingly unusual observation of strong orbital selectivity in the nematic phase of FeSe, uncover new clues on the nature of the nematic order, and set the stage to elucidate the interplay between superconductivity and nematicity in iron-based superconductors.