Pairing in graphene: A quantum Monte Carlo study
Superconductivity
2015-05-30 v1 Strongly Correlated Electrons
Abstract
To address the issue of electron correlation driven superconductivity in graphene, we perform a systematic quantum Monte Carlo study of the pairing correlation in the t-U-V Hubbard model on a honeycomb lattice. For V=0 and close to half filling, we find that pairing with d+id symmetry dominates pairing with extended-s symmetry. However, as the system size or the on-site Coulomb interaction increases, the long-range part of the d+id pairing correlation decreases and tends to vanish in the thermodynamic limit. An inclusion of nearest-neighbor interaction V, either repulsive or attractive, has a small effect on the extended-s pairing correlation, but strongly suppresses the d+id pairing correlation.
Cite
@article{arxiv.1109.6458,
title = {Pairing in graphene: A quantum Monte Carlo study},
author = {Tianxing Ma and Zhongbing Huang and Feiming Hu and Hai-Qing Lin},
journal= {arXiv preprint arXiv:1109.6458},
year = {2015}
}
Comments
5 pages, 5 figures