Liu Guangkun, Fang Shichao, Zheng Xiaojun, Huang Zhongbing, Lin Haiqing
Beijing Computational Science Research Center, Beijing 100193, People's Republic of China.
J Phys Condens Matter. 2018 Nov 7;30(44):445604. doi: 10.1088/1361-648X/aae289. Epub 2018 Sep 19.
To understand the interplay between nematic fluctuation and superconductivity in iron-based superconductors, we performed a systematic study of the realistic two-orbital Hubbard model at intermedium correlation regimes by using the constrained-path quantum Monte Carlo method. Our numerical results showed that the on-site nematic interaction induces a strong enhancement of nematic fluctuations at various momentums, especially at ([Formula: see text]). Simultaneously, it was found that the on-site nematic interaction suppresses the [Formula: see text] antiferromagnetic order and long-range electron pairing correlations for dominant pairing channels. Our findings suggest that on-site nematic fluctuation seems to compete with superconductivity in iron-based superconductors.
为了理解铁基超导体中向列涨落与超导性之间的相互作用，我们使用约束路径量子蒙特卡罗方法，对中等关联区域的现实双轨道哈伯德模型进行了系统研究。我们的数值结果表明，在位向列相互作用在各个动量处，特别是在（[公式：见原文]）处，强烈增强了向列涨落。同时，发现在位向列相互作用抑制了主导配对通道的[公式：见原文]反铁磁序和长程电子配对关联。我们的研究结果表明，在位向列涨落在铁基超导体中似乎与超导性相互竞争。
