Orbital order from the on-site orbital attraction

M. Khodas; A. V. Chubukov

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Orbital order from the on-site orbital attraction

机译：现场轨道引力的轨道顺序

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We study the model of Fe-based superconductors with intraorbital attraction, designed to favor a spontaneous orbital polarization. Previous studies of this model within the two-orbital approximation indicated that the leading instability is toward s-wave superconductivity and the subleading one is toward anti-ferro-orbital order, which breaks the translational symmetry of the crystal. The two-orbital approximation is, however, not consistent with the Fermi surface geometry of Fe superconductors, as it yields the wrong position of one of the hole pockets. Here we analyze the model with the same interaction but with realistic Fermi surface geometry (two hole pockets at the center of the Brillouin zone and two electron pockets at its boundary). We apply the parquet renormalization-group (pRG) technique to detect the leading instability upon the lowering of the temperature. We argue that the pRG analysis strongly favors a q = 0 orbital order, which in the band basis is a d-wave Pomeranchuk order.

机译：我们研究了具有轨道内吸引力的铁基超导体模型，该模型旨在支持自发的轨道极化。该模型在两轨道近似范围内的先前研究表明，前导不稳定性是针对s波超导性，次导性是针对反铁轨道序，这破坏了晶体的平移对称性。但是，二轨道近似与Fe超导体的费米表面几何形状不一致，因为它会产生一个错误的空穴位置。在这里，我们以相同的相互作用但具有逼真的费米表面几何形状（在布里渊区的中心有两个空穴，在边界处有两个电子空穴）来分析模型。我们应用实木复合地板重新归一化组（pRG）技术来检测温度降低时的前导不稳定性。我们认为，pRG分析强烈支持q = 0的轨道阶数，在带基中，这是一个d波Pomeranchuk阶数。

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《Physical review》 |2016年第11期|115159.1-115159.14|共14页
作者
M. Khodas; A. V. Chubukov;
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Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA,Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel;

School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA;

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Orbital order from the on-site orbital attraction

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