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 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 (π,π). Simultaneously, it was found that the on-site nematic interaction suppresses the (π,0)/(0,π) antiferromagnetic order and long-range electron pairing correlations for dominant pairing channels in iron-based superconductors. Our findings suggest that nematic fluctuation seems to compete with superconductivity in iron-based superconductors.
@article{arxiv.1807.09457,
title = {Interplay between nematic fluctuation and superconductivity in the two-orbital Hubbard model: A quantum Monte Carlo study},
author = {Guangkun Liu and Shichao Fang and Xiaojun Zheng and Zhongbing Huang and Haiqing Lin},
journal= {arXiv preprint arXiv:1807.09457},
year = {2018}
}